Added reranker exploration setup

129 post entity only does upserting

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,38 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version / Commit ID [e.g. 22]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.gitignore

@@ -20,3 +20,4 @@ src/Shared/obj
 src/Server/wwwroot/logs/*
 src/Server/Tools/CriticalCSS/node_modules
 src/Server/Tools/CriticalCSS/package*.json
+*.db*

README.md

@@ -1,92 +1,59 @@
-# embeddingsearch
-<img src="https://github.com/LD-Reborn/embeddingsearch/blob/main/logo.png" alt="Logo" width="100">
+# embeddingsearch<img src="docs/logo.png" alt="Logo" width="50" align="left">
+embeddingsearch is a self-hosted semantic search server built on vector embeddings.<br/>It lets you index and semantically search text using modern embedding models.
+<br/><br/>
+It's designed to be flexible, extensible, and easy to use.
 
-embeddingsearch is a search server that uses Embedding Similarity Search (similiarly to [Magna](https://github.com/yousef-rafat/Magna/tree/main)) to semantically compare a given input to a database of indexed entries.
+# Project outline
+<img src="docs/ProjectOutline/ProjectOutlineDiagram.excalidraw.svg" alt="Logo">
 
-embeddingsearch offers:
-- Privacy and flexibility through self-hosted solutions like:
-  - ollama
+## What embeddingsearch offers:
+- Privacy and flexibility by allowing one to self-host everything, including:
+  - Ollama
   - OpenAI-compatible APIs (like LocalAI)
-- Great flexibility through deep control over
-  - the amount of datapoints per entity (i.e. the thing you're trying to find)
-  - which models are used (multiple per datapoint possible to improve accuracy)
-  - which models are sourced from where (multiple Ollama/OpenAI-compatible sources possible)
-  - similarity calculation methods
-  - aggregation of results (when multiple models are used per datapoint)
+- Astonishing accuracy when using multiple models for single indices
+- Ease-of-use and ease-of-implementation
+  - The server offers a front-end for management and status information, as well as a decorated swagger back-end
+  - The indexer can also be self-hosted and serves as a host for executing indexing scripts
+  - The client library can be used to develop your own client software that posts queries or creates indices
+- Caching & persistency
+  - Generating embeddings is expensive. So why not cache AND store them?
+  - Query results can also be cached.
+  - "Doesn't that eat a lot of precious RAM?" - My own testing showed: embeddings take up around 4200-5200 bytes each depending on the request string size. So around 4-5 GB per million cached embeddings.
 
-This repository comes with a
-- server (accessible via API calls & swagger)
-- clientside library (C#)
-- scripting based indexer service that supports the use of
+This repository comes with a:
+- Server
+- Client library (C#)
+- Scripting based indexer service that supports the use of
   - Python
-  - CSharp (Roslyn)
-  - Golang (Planned)
+  - CSharp (Roslyn - at-runtime evaluation)
+  - CSharp (Reflection - compiled)
+  - Lua (Planned)
   - Javascript (Planned)
 
-# How to set up / use
+# How to set up
 ## Server
-(Docker now available! See [Docker installation](docs/Server.md#docker-installation))
-1. Install [ollama](https://ollama.com/download)
-2. Pull a few models using ollama (e.g. `paraphrase-multilingual`, `bge-m3`, `mxbai-embed-large`, `nomic-embed-text`)
-3. [Install the depencencies](docs/Server.md#installing-the-dependencies)
-4. [Set up a local mysql database](docs/Server.md#mysql-database-setup)
-5. [Set up the configuration](docs/Server.md#setup)
-6. In `src/server` execute `dotnet build && dotnet run` to start the server
-7. (optional) [Create a searchdomain using the web interface](docs/Server.md#accessing-the-api)
-## Client
-1. Download the package and add it to your project (TODO: NuGet)
-2. Create a new client by either:
-    1. By injecting IConfiguration (e.g. `services.AddSingleton<Client>();`)
-    2. By specifying the baseUri, apiKey, and searchdomain (e.g. `new Client.Client(baseUri, apiKey, searchdomain)`)
+(Docker also available! See [Docker installation](docs/Server.md#docker-installation))
+1. Install the inferencing tool of your choice, (e.g. [ollama](https://ollama.com/download)) and pull a few models that support generating embeddings.
+2. [Install the depencencies](docs/Server.md#installing-the-dependencies)
+3. [Set up a mysql database](docs/Server.md#mysql-database-setup)
+4. [Set up the configuration](docs/Server.md#configuration)
+5. In `src/Server` execute `dotnet build && dotnet run` to start the server
+6. (optional) Create a searchdomain using the web interface
 ## Indexer
 (Docker now available! See [Docker installation](docs/Indexer.md#docker-installation))
 1. [Install the dependencies](docs/Indexer.md#installing-the-dependencies)
-2. [Set up the server](#server)
-3. [Configure the indexer](docs/Indexer.md#configuration)
-4. [Set up your indexing script(s)](docs/Indexer.md#scripting)
-5. Run with `dotnet build && dotnet run` (Or `/usr/bin/dotnet build && /usr/bin/dotnet run`)
+2. [Configure the indexer](docs/Indexer.md#configuration)
+3. [Set up your indexing script(s)](docs/Indexer.md#scripting)
+4. In `src/Indexer` execute `dotnet build && dotnet run` to start the indexer
 # Known issues
 | Issue | Solution |
 | --- | --- |
-| Unhandled exception. MySql.Data.MySqlClient.MySqlException (0x80004005): Invalid attempt to access a field before calling Read() | The searchdomain you entered does not exist |
-| Unhandled exception. MySql.Data.MySqlClient.MySqlException (0x80004005): Authentication to host 'localhost' for user 'embeddingsearch' using method 'caching_sha2_password' failed with message: Access denied for user 'embeddingsearch'@'localhost' (using password: YES) | TBD |
-| System.DllNotFoundException: Could not load libpython3.12.so with flags RTLD_NOW \| RTLD_GLOBAL: libpython3.12.so: cannot open shared object file: No such file or directory | Install python3.12-dev via apt. Also: try running the indexer using `/usr/bin/dotnet` instead of `dotnet` (make sure dotnet is installed via apt) |
-# To-do
-- (High priority) Add default indexer
-  - Library
-    - Processing:
-      - Text / Markdown documents: file name, full text, paragraphs
-      - Documents
-        - PDF: file name, full text, headline?, paragraphs, images?
-        - odt/docx: file name, full text, headline?, images?
-        - msg/eml: file name, title, recipients, cc, text
-      - Images: file name, OCR, image description?
-      - Videos?
-      - Presentations (Impress/Powerpoint): file name, full text, first slide title, titles, slide texts
-      - Tables (Calc / Excel): file name, tab/page names?, full text (per tab/page)
-      - Other? (TBD)
-  - Server
-    - ~~Scripting capability (Python; perhaps also lua)~~ (Done with the latest commits)
-      - ~~Intended sourcing possibilities:~~
-        - ~~Local/Remote files (CIFS, SMB, FTP)~~
-        - ~~Database contents (MySQL, MSSQL)~~
-        - ~~Web requests (E.g. manual crawling)~~
-    - ~~Script call management (interval based & event based)~~
-- Implement [ReaderWriterLock](https://learn.microsoft.com/en-us/dotnet/api/system.threading.readerwriterlockslim?view=net-9.0&redirectedfrom=MSDN) for entityCache to allow for multithreaded read access while retaining single-threaded write access.
-- NuGet packaging and corresponding README documentation
-- Add option for query result detail levels. e.g.:
-  - Level 0: `{"Name": "...", "Value": 0.53}`
-  - Level 1: `{"Name": "...", "Value": 0.53, "Datapoints": [{"Name": "title", "Value": 0.65}, {...}]}`
-  - Level 2: `{"Name": "...", "Value": 0.53, "Datapoints": [{"Name": "title", "Value": 0.65, "Embeddings": [{"Model": "bge-m3", "Value": 0.87}, {...}]}, {...}]}`
-- Add "Click-Through" result evaluation (For each entity: store a list of queries that led to the entity being chosen by the user. Then at query-time choose the best-fitting entry and maybe use it as another datapoint? Or use a separate weight function?)
-- Reranker/Crossencoder/RAG (or anything else beyond initial retrieval) support
-- Remove the `id` collumns from the database tables where the table is actually identified (and should be unique by) the name, which should become the new primary key.
-- Improve performance & latency (Create ready-to-go processes where each contain an n'th share of the entity cache, ready to perform a query. Prepare it after creating the entity cache.)
-- Implement dynamic invocation based database migrations
-
-# Future features
-- Support for other database types (MSSQL, SQLite)
+| System.DllNotFoundException: Could not load libpython3.13.so with flags RTLD_NOW \| RTLD_GLOBAL: libpython3.12.so: cannot open shared object file: No such file or directory | Install python3.13-dev via apt. Also: try running the indexer using `/usr/bin/dotnet` instead of `dotnet` (to make sure dotnet is not running as a snap) |
 
+# Planned features and support
+- Document processor with automatic chunking (e.g.: .md, .pdf, .docx, .xlsx, .png, .mp4)
+- Indexer front-end
+- Support for other database types (MSSQL, SQLite, PostgreSQL, MongoDB, Redis)
 
 # Community
-<a href="https://discord.gg/MUKeZM3k"><img src="https://img.shields.io/badge/Join%20Discord-7289DA?style=flat&logo=discord&logoColor=whiteServer" alt="Discord"></img></a>
+<a href="https://discord.gg/MUKeZM3k"><img src="https://img.shields.io/badge/Join%20Discord-7289DA?style=flat&logo=discord&logoColor=whiteServer" alt="Discord"></img></a>

docs/Indexer.md

@@ -8,15 +8,18 @@ The indexer by default
 - Uses HealthChecks (endpoint: `/healthz`)
 ## Docker installation
 (On Linux you might need root privileges, thus use `sudo` where necessary)
-1. Navigate to the `src` directory
-2. Build the docker container: `docker build -t embeddingsearch-indexer -f Indexer/Dockerfile .`
-3. Run the docker container: `docker run --net=host -t embeddingsearch-indexer` (the `-t` is optional, but you get more meaningful output. Or use `-d` to run it in the background)
+1. [Configure the indexer](docs/Indexer.md#configuration)
+2. [Set up your indexing script(s)](docs/Indexer.md#scripting)
+3. Navigate to the `src` directory
+4. Build the docker container: `docker build -t embeddingsearch-indexer -f Indexer/Dockerfile .`
+5. Run the docker container: `docker run --net=host -t embeddingsearch-indexer` (the `-t` is optional, but you get more meaningful output. Or use `-d` to run it in the background)
 ## Installing the dependencies
 ## Ubuntu 24.04
-1. Install the .NET SDK: `sudo apt update && sudo apt install dotnet-sdk-8.0 -y`
-2. Install the python SDK: `sudo apt install python3 python3.12 python3.12-dev`
+1. Install the .NET SDK: `sudo apt update && sudo apt install dotnet-sdk-10.0 -y`
+2. Install the python SDK: `sudo apt install python3 python3.13 python3.13-dev`
+    - Note: Python 3.14 is not supported yet
 ## Windows
-Download the [.NET SDK](https://dotnet.microsoft.com/en-us/download) or follow these steps to use WSL:
+Download and install the [.NET SDK](https://dotnet.microsoft.com/en-us/download) or follow these steps to use WSL:
 1. Install Ubuntu in WSL (`wsl --install` and `wsl --install -d Ubuntu`)
 2. Enter your WSL environment `wsl.exe` and configure it
 3. Update via `sudo apt update && sudo apt upgrade -y && sudo snap refresh`
@@ -26,15 +29,15 @@ The configuration is located in `src/Indexer` and conforms to the [ASP.NET confi
 
 If you plan to use multiple environments, create any `appsettings.{YourEnvironment}.json` (e.g. `Development`, `Staging`, `Prod`) and set the environment variable `DOTNET_ENVIRONMENT` accordingly on the target machine.
 ## Setup
-If you just installed the server and want to configure it:
-1. Open `src/Server/appsettings.Development.json`
+If you just installed the indexer and want to configure it:
+1. Open `src/Indexer/appsettings.Development.json`
 2. If your search server is not on the same machine as the indexer, update "BaseUri" to reflect the URL to the server.
-3. If your search server requires API keys, (i.e. it's operating outside of the "Development" environment) set `"ApiKey": "<your key here>"` beneath `"BaseUri"` in the `"Embeddingsearch"` section.
-4. Create your own indexing script(s) in `src/Indexer/Scripts/` and configure their use as 
+3. If you configured API keys for the search server, set `"ApiKey": "<your key here>"` beneath `"BaseUri"` in the `"Server"` section.
+4. Create your own indexing script(s) in `src/Indexer/Scripts/` and configure them as shown below
 ## Structure
 ```json
-  "EmbeddingsearchIndexer": {
-    "Worker":
+  "Indexer": {
+    "Workers":
     [ // This is a list; you can have as many "workers" as you want
       {
         "Name": "example",
@@ -50,7 +53,12 @@ If you just installed the server and want to configure it:
         "Name": "secondWorker",
         /* ... */
       }
-    ]
+    ],
+    "ApiKeys": ["YourApiKeysHereForTheIndexer"], // API Keys for if you want to protect the indexer's API
+    "Server": {
+      "BaseUri": "http://localhost:5000", // URL to the embeddingsearch server
+      "ApiKey": "ServerApiKeyHere" // API Key set in the server
+    }
   }
 ```
 ## Call types
@@ -71,6 +79,13 @@ If you just installed the server and want to configure it:
     - Parameters:
       - Path (e.g. "Scripts/example_content")
 # Scripting
+Scripts should be put in `src/Indexer/Scripts/`. If you look there, by default you will find some example scripts that can be taken as reference when building your own.
+
+For configuration of the scripts see: [Structure](#structure)
+
+The next few sections explain some core concepts/patterns. If you want to skip to explicit code examples, look here:
+- [Python](#python)
+- [Roslyn](#c-roslyn)
 ## General
 Scripts need to define the following functions:
 - `init()`
@@ -186,7 +201,7 @@ from tools import * # Import all tools that are provided for ease of scripting
 
 def init(toolset: Toolset): # defining an init() function with 1 parameter is required.
     pass # Your code would go here.
-    # DO NOT put a main loop here! Why?
+    # Don't put a main loop here! Why?
     # This function prevents the application from initializing and maintains exclusive control over the GIL
 
 def update(toolset: Toolset): # defining an update() function with 1 parameter is required.
@@ -261,7 +276,7 @@ public class ExampleScript : Indexer.Models.IScript
 // Required: return an instance of your IScript-extending class
 return new ExampleScript();
 ```
-## Golang
+## Lua
 TODO
 ## Javascript
 TODO

docs/ProjectOutline/ProjectOutlineDiagram.excalidraw.md

@@ -0,0 +1,190 @@
+---
+
+excalidraw-plugin: parsed
+tags: [excalidraw]
+
+---
+==⚠  Switch to EXCALIDRAW VIEW in the MORE OPTIONS menu of this document. ⚠== You can decompress Drawing data with the command palette: 'Decompress current Excalidraw file'. For more info check in plugin settings under 'Saving'
+
+
+# Excalidraw Data
+
+## Text Elements
+Server ^TJzgO4nS
+
+Indexer ^rgrd8gyy
+
+embeddingsearch ^jB1B7xr7
+
+Client ^ZttcBOXC
+
+embeddings
+provider ^mEIPhpn1
+
+✔️ Ollama
+✔️ OpenAI-compatible
+    (e.g. LocalAI) ^o6rED2fi
+
+uses ^QkKnkGvS
+
+Database ^yaSaChsK
+
+✔️ MySQL
+⚒️ SQLite
+⚒️ MSSQL
+⚒️ PostgreSQL
+⚒️ MongoDB
+⚒️ Redis ^LHP4PU6V
+
+Stores
+data in ^FP2xPhxz
+
+Listens on port 5146
+ ^CJG2peC6
+
+Listens on port 5210 ^iLZT5hca
+
+Workers ^33rXJfFb
+
+- example.py
+- example.csx
+- ... ^e1BVqXa2
+
+✔️ Front-end
+✔️ Swagger
+✔️ Elmah ^6UTNDntp
+
+⚒️ Front-end
+✔️ Swagger
+✔️ Elmah ^tlLF3R27
+
+✔️ Caches embeddings
+✔️ Caches queries ^I2lN1U82
+
+✔️ C# library
+⚒️ NuGet
+✔️ Searchdomain CRUD
+✔️ Entity CRUD
+✔️ Management operations ^4Ab3XHhK
+
+Uses ^KvuBRV2K
+
+Accesses ^ikhSH5rs
+
+✔️ Multiple provider
+configuration ^ipkoadg8
+
+%%
+## Drawing
+```compressed-json
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+
+caMuPQ5t3LZy+dBsuZATLm5nUHqC8sGWjLflzlmqaCs+WbhVIkMMpD0veXXLmQBqqzMDJxXgrmQR6GRb6GpXIrGV4i6cgisJX9AFCSi4ROjMhaXLUAQy75ZDGImUxiY8VtlcKtoHiAuAigPgPRO6WrL8Vyq0Zdas4wY+TsTqxVaqv6BG1aaGCNSDxBN5DQ2AEkDKCTXjIeYVwZrbe3qhNRVLzAWa9SHwDtA0AE4ouTJqT3TA0BqlowGwAMByXrkB
+
+ANhAFZohZF/cRyRqz1cyATWq4BaXhfyF0s8gSAQZ2K99eIDygEAu2cM5nBIB9dcoaBwDsEEyGg3RlH/H0PtGpAPQOUHITKnRFCTJCMb6N6gPiD1BlUsQjCBCzVQKQo3cAaN7YDjZrCU2KbuN44GVTBxPXQrSOOAARb41kpY1jCFMCQh6Pw3CB52dqulH4vLkiAwN3nViHOyKXol+Z4QJ+rwQUcMMh1OxUwG7Bpp5bWIRW5YshsC35bDNuwHCh+bM
+
+BZQ52OAODYQBa3obLA7EP0EICMAcY51/AJdedYxwMg1tni5h2aYYIir5iJOgUcY5RgDAN8YIK7Y6g5bQgS2a27bftvlnHrY3KG3alXKXxIi2QIQG+rF2e7dmOyIGCWCAA===
+```
+%%

docs/Server.md

@@ -1,21 +1,21 @@
 # Overview
 The server by default
 - runs on port 5146
-- Uses Swagger UI in development mode (`/swagger/index.html`)
-- Ignores API keys when in development mode
+- Uses Swagger UI (`/swagger/index.html`)
 - Uses Elmah error logging (endpoint: `/elmah`, local files: `~/logs`)
 - Uses serilog logging (local files: `~/logs`)
 - Uses HealthChecks (endpoint: `/healthz`)
 ## Docker installation
-(On Linux you might need root privileges, thus use `sudo` where necessary)
-1. Navigate to the `src/server` directory
-2. Build the docker container: `docker build -t embeddingsearch-server -f /Dockerfile .`
-3. Run the docker container: `docker run --net=host -t embeddingsearch-server` (the `-t` is optional, but you get more meaningful output. Or use `-d` to run it in the background)
+(On Linux you might need root privileges. Use `sudo` where necessary)
+1. [Set up the configuration](docs/Server.md#setup)
+2. Navigate to the `src` directory
+3. Build the docker container: `docker build -t embeddingsearch-server -f Server/Dockerfile .`
+4. Run the docker container: `docker run --net=host -t embeddingsearch-server` (the `-t` is optional, but you get more meaningful output. Or use `-d` to run it in the background)
 # Installing the dependencies
 ## Ubuntu 24.04
-1. Install the .NET SDK: `sudo apt update && sudo apt install dotnet-sdk-8.0 -y`
+1. Install the .NET SDK: `sudo apt update && sudo apt install dotnet-sdk-10.0 -y`
 ## Windows
-Download the [.NET SDK](https://dotnet.microsoft.com/en-us/download) or follow these steps to use WSL:
+Download and install the [.NET SDK](https://dotnet.microsoft.com/en-us/download) or follow these steps to use WSL:
 1. Install Ubuntu in WSL (`wsl --install` and `wsl --install -d Ubuntu`)
 2. Enter your WSL environment `wsl.exe` and configure it
 3. Update via `sudo apt update && sudo apt upgrade -y && sudo snap refresh`
@@ -30,6 +30,9 @@ Download the [.NET SDK](https://dotnet.microsoft.com/en-us/download) or follow t
 `CREATE DATABASE embeddingsearch; use embeddingsearch;`
 4. Create the user (replace "somepassword! with a secure password):
 `CREATE USER 'embeddingsearch'@'%' identified by "somepassword!"; GRANT ALL ON embeddingsearch.* TO embeddingsearch; FLUSH PRIVILEGES;`
+    - Caution: The symbol "%" in the command means that this user can be logged into from outside of the machine.
+    - Replace `'%'` with `'localhost'` or with the IP of your embeddingsearch server machine if that is a concern.
+5. Exit mysql: `exit`
 
 # Configuration
 ## Environments
@@ -43,34 +46,39 @@ If you just installed the server and want to configure it:
 3. Check the "AiProviders" section. If your Ollama/LocalAI/etc. instance does not run locally, update the "baseURL" to point to the correct URL.
 4. If you plan on using the server in production:
     1. Set the environment variable `DOTNET_ENVIRONMENT` to something that is not "Development". (e.g. "Prod")
-    2. Rename the `appsettings.Development.json` - replace "Development" with whatever you chose. (e.g. "Prod")
+    2. Rename the `appsettings.Development.json` - replace "Development" with what you chose for `DOTNET_ENVIRONMENT`
     3. Set API keys in the "ApiKeys" section (generate keys using the `uuid` command on Linux)
 ## Structure
 ```json
   "Embeddingsearch": {
     "ConnectionStrings": {
-      "SQL": "server=localhost;database=embeddingsearch;uid=embeddingsearch;pwd=somepassword!;"
+      "SQL": "server=localhost;database=embeddingsearch;uid=embeddingsearch;pwd=somepassword!;",
+      "Cache": "Data Source=embeddings.db;Mode=ReadWriteCreate;Cache=Shared" // Name of the sqlite cache file
     },
     "Elmah": {
-      "AllowedHosts": [ // Specify which IP addresses can access /elmah
-        "127.0.0.1",
-        "::1",
-        "172.17.0.1"
-      ]
+      "LogPath": "~/logs" // Where the logs are stored
     },
     "AiProviders": {
-      "ollama": { // Name of the provider. Used when defining models for a datapoint, e.g. "ollama:mxbai-embed-large"
+      "ollama": { // Name for the provider. Used when defining models for a datapoint, e.g. "ollama:mxbai-embed-large"
         "handler": "ollama", // The type of API located at baseURL
-        "baseURL": "http://localhost:11434" // Location of the API
+        "baseURL": "http://localhost:11434", // Location of the API
+        "Allowlist": [".*"], // Allow- and Denylist. Filter out non-embeddings models using regular expressions
+        "Denylist": ["qwen3-coder:latest", "qwen3:0.6b", "deepseek-v3.1:671b-cloud", "qwen3-vl", "deepseek-ocr"]
       },
-      "localAI": {
+      "localAI": { // e.g. model name: "localAI:bert-embeddings"
         "handler": "openai",
         "baseURL": "http://localhost:8080",
-        "ApiKey": "Some API key here"
+        "ApiKey": "Some API key here",
+        "Allowlist": [".*"],
+        "Denylist": ["cross-encoder", "..."]
       }
     },
-    "ApiKeys": ["Some UUID here", "Another UUID here"], // Restrict access in non-development environments to the server's API using your own generated API keys
-    "UseHttpsRedirection": true // tbh I don't even know why this is still here. // TODO implement HttpsRedirection or remove this line
+    "ApiKeys": ["Some UUID here", "Another UUID here"], // (optional) Restrict access using API keys
+    "Cache": {
+      "CacheTopN": 10000, // Only cache this number of queries. (Eviction policy: LRU)
+      "StoreEmbeddingCache": true, // If set to true, the SQLite database will be used to store the embeddings
+      "StoreTopN": 10000 // Only write the top n number of queries to the SQLite database
+    }
   }
 ```
 ## AiProviders
@@ -91,9 +99,9 @@ One can even specify multiple Ollama instances and name them however one pleases
 ```
 ### handler
 Currently two handlers are implemented for embeddings generation:
-- ollama
+- `ollama`
     - requests embeddings from `/api/embed`
-- localai
+- `openai`
     - requests embeddings from `/v1/embeddings`
 ### baseURL
 Specified by `scheme://host:port`. E.g.: `"baseUrl": "http://localhost:11434"`
@@ -105,7 +113,7 @@ Any specified absolute path will be disregarded. (e.g. "http://x.x.x.x/any/subro
 
 # API
 ## Accessing the api
-Once started, the server's API can be comfortably be viewed and manipulated via swagger.
+Once started, the server's API can be viewed and manipulated via swagger.
 
 By default it is accessible under: `http://localhost:5146/swagger/index.html`
 
@@ -114,7 +122,7 @@ To make an API request from within swagger:
 2. Click the "Try it out" button. The input fields (if there are any for your action) should now be editable.
 3. Fill in the necessary information
 4. Click "Execute"
-## Restricting access
-API keys do **not** get checked in Development environment!
+## Authorization
+Being logged in has priority over API Key requirement (if api keys are set).
 
-Set up a non-development environment as described in [Configuration>Setup](#setup) to enable API key authentication.
+So being logged in automatically authorizes endpoint usage.

src/Client/Client.cs

@@ -47,15 +47,27 @@ public class Client
             return await FetchUrlAndProcessJson<EntityListResults>(HttpMethod.Get, url);
         }
 
-        public async Task<EntityIndexResult> EntityIndexAsync(List<JSONEntity> jsonEntity)
+        public async Task<EntityIndexResult> EntityIndexAsync(List<JSONEntity> jsonEntity, string? sessionId = null, bool? sessionComplete = null)
         {
-            return await EntityIndexAsync(JsonSerializer.Serialize(jsonEntity));
+            return await EntityIndexAsync(JsonSerializer.Serialize(jsonEntity), sessionId, sessionComplete);
         }
 
-        public async Task<EntityIndexResult> EntityIndexAsync(string jsonEntity)
+        public async Task<EntityIndexResult> EntityIndexAsync(string jsonEntity, string? sessionId = null, bool? sessionComplete = null)
         {
             var content = new StringContent(jsonEntity, Encoding.UTF8, "application/json");
-            return await FetchUrlAndProcessJson<EntityIndexResult>(HttpMethod.Put, GetUrl($"{baseUri}", "Entities", []), content);
+            Dictionary<string, string> parameters = [];
+            if (sessionId is not null) parameters.Add("sessionId", sessionId);
+            if (sessionComplete is not null) parameters.Add("sessionComplete", ((bool)sessionComplete).ToString());
+
+            return await FetchUrlAndProcessJson<EntityIndexResult>(
+                HttpMethod.Put,
+                GetUrl(
+                    $"{baseUri}",
+                    $"Entities",
+                    parameters
+                ),
+                content
+            );
         }
 
         public async Task<EntityDeleteResults> EntityDeleteAsync(string entityName)
@@ -121,13 +133,13 @@ public class Client
             }), new StringContent(settings, Encoding.UTF8, "application/json"));
         }
 
-        public async Task<SearchdomainSearchesResults> SearchdomainGetQueriesAsync(string searchdomain)
+        public async Task<SearchdomainQueriesResults> SearchdomainGetQueriesAsync(string searchdomain)
         {
             Dictionary<string, string> parameters = new()
             {
                 {"searchdomain", searchdomain}
             };
-            return await FetchUrlAndProcessJson<SearchdomainSearchesResults>(HttpMethod.Get, GetUrl($"{baseUri}/Searchdomain", "Queries", parameters));
+            return await FetchUrlAndProcessJson<SearchdomainQueriesResults>(HttpMethod.Get, GetUrl($"{baseUri}/Searchdomain", "Queries", parameters));
         }
 
         public async Task<EntityQueryResults> SearchdomainQueryAsync(string query)
@@ -148,6 +160,21 @@ public class Client
             return await FetchUrlAndProcessJson<EntityQueryResults>(HttpMethod.Post, GetUrl($"{baseUri}/Searchdomain", "Query", parameters), null);
         }
 
+        public async Task<EntityQueryResults> SearchdomainQueryRerankedAsync(string searchdomain, string query, string rerankerModel, int topN, int topNRetrieval, bool returnAttributes = false)
+        {
+            Dictionary<string, string> parameters = new()
+            {
+                { "searchdomain", searchdomain },
+                { "query", query },
+                { "rerankerModel", (rerankerModel).ToString() },
+                { "topN", (topN).ToString() },
+                { "topNRetrieval", (topNRetrieval).ToString() }
+            };
+            if (returnAttributes) parameters.Add("returnAttributes", returnAttributes.ToString());
+
+            return await FetchUrlAndProcessJson<EntityQueryResults>(HttpMethod.Post, GetUrl($"{baseUri}/Searchdomain", "QueryReranked", parameters), null);
+        }
+
         public async Task<SearchdomainDeleteSearchResult> SearchdomainDeleteQueryAsync(string searchdomain, string query)
         {
             Dictionary<string, string> parameters = new()
@@ -190,13 +217,13 @@ public class Client
             return await FetchUrlAndProcessJson<SearchdomainUpdateResults>(HttpMethod.Put, GetUrl($"{baseUri}/Searchdomain", "Settings", parameters), content);
         }
 
-        public async Task<SearchdomainSearchCacheSizeResults> SearchdomainGetQueryCacheSizeAsync(string searchdomain)
+        public async Task<SearchdomainQueryCacheSizeResults> SearchdomainGetQueryCacheSizeAsync(string searchdomain)
         {
             Dictionary<string, string> parameters = new()
             {
                 {"searchdomain", searchdomain}
             };
-            return await FetchUrlAndProcessJson<SearchdomainSearchCacheSizeResults>(HttpMethod.Get, GetUrl($"{baseUri}/Searchdomain/QueryCache", "Size", parameters));
+            return await FetchUrlAndProcessJson<SearchdomainQueryCacheSizeResults>(HttpMethod.Get, GetUrl($"{baseUri}/Searchdomain/QueryCache", "Size", parameters));
         }
 
         public async Task<SearchdomainInvalidateCacheResults> SearchdomainClearQueryCache(string searchdomain)
@@ -222,9 +249,9 @@ public class Client
             return await FetchUrlAndProcessJson<ServerGetModelsResult>(HttpMethod.Get, GetUrl($"{baseUri}/Server", "Models", []));
         }
 
-        public async Task<ServerGetEmbeddingCacheSizeResult> ServerGetEmbeddingCacheSizeAsync()
+        public async Task<ServerGetStatsResult> ServerGetStatsAsync()
         {
-            return await FetchUrlAndProcessJson<ServerGetEmbeddingCacheSizeResult>(HttpMethod.Get, GetUrl($"{baseUri}/Server/EmbeddingCache", "Size", []));
+            return await FetchUrlAndProcessJson<ServerGetStatsResult>(HttpMethod.Get, GetUrl($"{baseUri}/Server/Stats", "Size", []));
         }
 
         private async Task<T> FetchUrlAndProcessJson<T>(HttpMethod httpMethod, string url, HttpContent? content = null)

src/Client/Client.csproj

@@ -5,7 +5,7 @@
   </ItemGroup>
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>

src/Indexer/Dockerfile

@@ -1,7 +1,7 @@
-FROM ubuntu:24.04 AS ubuntu
+FROM ubuntu:25.10 AS ubuntu
 WORKDIR /app
 RUN apt-get update
-RUN apt-get install -y python3.12 python3.12-venv python3.12-dev dotnet-sdk-8.0
+RUN apt-get install -y python3.13 python3.13-venv python3.13-dev dotnet-sdk-10.0
 RUN apt-get clean
 COPY . /src/
 ENV ASPNETCORE_ENVIRONMENT Docker

src/Indexer/Indexer.csproj

@@ -1,22 +1,22 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="ElmahCore" Version="2.1.2" />
-    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.14" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.14.0" />
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.8" />
-    <PackageReference Include="Quartz.Extensions.Hosting" Version="3.15.0" />
-    <PackageReference Include="Serilog.AspNetCore" Version="9.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="10.0.2" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="5.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.2" />
+    <PackageReference Include="Quartz.Extensions.Hosting" Version="3.15.1" />
+    <PackageReference Include="Serilog.AspNetCore" Version="10.0.0" />
     <PackageReference Include="Serilog.Sinks.File" Version="7.0.0" />
-    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
-    <PackageReference Include="System.Configuration.ConfigurationManager" Version="9.0.3" />
-    <PackageReference Include="Python" Version="3.13.3" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="10.1.0" />
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="10.0.2" />
+    <PackageReference Include="Python" Version="3.14.2" />
     <PackageReference Include="Pythonnet" Version="3.0.5" />
   </ItemGroup>
   <ItemGroup>

src/Indexer/Program.cs

@@ -80,8 +80,6 @@ else
     app.UseMiddleware<Shared.ApiKeyMiddleware>();
 }
 
-// app.UseHttpsRedirection();
-
 app.MapControllers();
 
 app.Run();

src/Indexer/Scripts/example.py

@@ -65,6 +65,7 @@ def index_files(toolset: Toolset):
         jsonEntities.append(jsonEntity)
     jsonstring = json.dumps(jsonEntities)
     timer_start = time.time()
+    # Index all entities in one go. If you need to split it into chunks, use the session attributes! See example_chunked.py
     result:EntityIndexResult = toolset.Client.EntityIndexAsync(jsonstring).Result
     timer_end = time.time()
     toolset.Logger.LogInformation(f"Update was successful: {result.Success} - and was done in {timer_end - timer_start} seconds.")

src/Indexer/Scripts/example_chunked.py

@@ -0,0 +1,85 @@
+import math
+import os
+from tools import *
+import json
+from dataclasses import asdict
+import time
+import uuid
+
+example_content = "./Scripts/example_content"
+probmethod = "HVEWAvg"
+similarityMethod = "Cosine"
+example_searchdomain = "example_" + probmethod
+example_counter = 0
+models = ["ollama:bge-m3", "ollama:mxbai-embed-large"]
+probmethod_datapoint = probmethod
+probmethod_entity = probmethod
+# Example for a dictionary based weighted average:
+#   probmethod_datapoint = "DictionaryWeightedAverage:{\"ollama:bge-m3\": 4, \"ollama:mxbai-embed-large\": 1}"
+#   probmethod_entity = "DictionaryWeightedAverage:{\"title\": 2, \"filename\": 0.1, \"text\": 0.25}"
+
+def init(toolset: Toolset):
+    global example_counter
+    toolset.Logger.LogInformation("{toolset.Name} - init", toolset.Name)
+    toolset.Logger.LogInformation("This is the init function from the python example script")
+    toolset.Logger.LogInformation(f"example_counter: {example_counter}")
+    searchdomainlist:SearchdomainListResults = toolset.Client.SearchdomainListAsync().Result
+    if example_searchdomain not in searchdomainlist.Searchdomains:
+        toolset.Client.SearchdomainCreateAsync(example_searchdomain).Result
+        searchdomainlist = toolset.Client.SearchdomainListAsync().Result
+    output = "Currently these searchdomains exist:\n"
+    for searchdomain in searchdomainlist.Searchdomains:
+        output += f" - {searchdomain}\n"
+    toolset.Logger.LogInformation(output)
+
+def update(toolset: Toolset):
+    global example_counter
+    toolset.Logger.LogInformation("{toolset.Name} - update", toolset.Name)    
+    toolset.Logger.LogInformation("This is the update function from the python example script")
+    callbackInfos:ICallbackInfos = toolset.CallbackInfos
+    if (str(callbackInfos) == "Indexer.Models.RunOnceCallbackInfos"):
+        toolset.Logger.LogInformation("It was triggered by a runonce call")
+    elif (str(callbackInfos) == "Indexer.Models.IntervalCallbackInfos"):
+        toolset.Logger.LogInformation("It was triggered by an interval call")
+    elif (str(callbackInfos) == "Indexer.Models.ScheduleCallbackInfos"):
+        toolset.Logger.LogInformation("It was triggered by a schedule call")
+    elif (str(callbackInfos) == "Indexer.Models.FileUpdateCallbackInfos"):
+        toolset.Logger.LogInformation("It was triggered by a fileupdate call")
+    else:
+        toolset.Logger.LogInformation("It was triggered, but the origin of the call could not be determined")
+    example_counter += 1
+    toolset.Logger.LogInformation(f"example_counter: {example_counter}")
+    index_files(toolset)
+
+def index_files(toolset: Toolset):
+    jsonEntities:list = []
+    for filename in os.listdir(example_content):
+        qualified_filepath = example_content + "/" + filename
+        with open(qualified_filepath, "r", encoding='utf-8', errors="replace") as file:
+            title = file.readline()
+            text = file.read()
+        datapoints:list = [
+            JSONDatapoint("filename", qualified_filepath, probmethod_datapoint, similarityMethod, models),
+            JSONDatapoint("title", title, probmethod_datapoint, similarityMethod, models),
+            JSONDatapoint("text", text, probmethod_datapoint, similarityMethod, models)
+        ]
+        jsonEntity:dict = asdict(JSONEntity(qualified_filepath, probmethod_entity, example_searchdomain, {}, datapoints))
+        jsonEntities.append(jsonEntity)
+    timer_start = time.time()
+    chunkSize = 5
+    chunkList = chunk_list(jsonEntities, chunkSize)
+    chunkCount = math.ceil(len(jsonEntities) / chunkSize)
+    sessionId = uuid.uuid4().hex
+    print(f"indexing {len(jsonEntities)} entities")
+    for i, entities in enumerate(chunkList):
+        isLast = i == chunkCount
+        print(f'Processing chunk {i} / {len(jsonEntities) / chunkSize}')
+        jsonstring = json.dumps(entities)
+        result:EntityIndexResult = toolset.Client.EntityIndexAsync(jsonstring, sessionId, isLast).Result
+    timer_end = time.time()
+    toolset.Logger.LogInformation(f"Update was successful: {result.Success} - and was done in {timer_end - timer_start} seconds.")
+
+
+def chunk_list(lst, chunk_size):
+    for i in range(0, len(lst), chunk_size):
+        yield lst[i: i + chunk_size]

src/Indexer/Scripts/tools.py

@@ -107,6 +107,8 @@ class Client:
     #    pass
     async def EntityIndexAsync(jsonEntity:str) -> EntityIndexResult:
         pass
+    async def EntityIndexAsync(jsonEntity:str, sessionId:str, sessionComplete:bool) -> EntityIndexResult:
+        pass
     async def EntityIndexAsync(searchdomain:str, jsonEntity:str) -> EntityIndexResult:
         pass
     async def EntityListAsync(returnEmbeddings:bool = False) -> EntityListResults:

src/Indexer/appsettings.Development.json

@@ -21,7 +21,8 @@
     "ApiKeys": ["xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"],
     "Server": {
       "BaseUri": "http://localhost:5146",
-      "ApiKey": "yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy"
-    }
+      "ApiKey": "APIKeyForTheServer"
+    },
+    "PythonRuntime": "libpython3.13.so"
   }
 }

src/Indexer/appsettings.Docker.json

@@ -5,26 +5,8 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "Kestrel":{
-    "Endpoints": {
-      "http":{
-        "Url": "http://0.0.0.0:5120"
-      }
-    }
-  },
-  "Embeddingsearch": {
-    "BaseUri": "http://172.17.0.1:5146",
-    "ApiKeys": ["b54ea868-496e-11f0-9cc7-f79f06b160e5", "bbdeedf0-496e-11f0-9744-97e28c221f67"]
-  },
-  "EmbeddingsearchIndexer": {
-    "Elmah": {
-      "AllowedHosts": [
-        "127.0.0.1",
-        "::1",
-        "172.17.0.1"
-      ]
-    },
-    "Worker":
+  "Indexer": {
+    "Workers":
     [
       {
         "Name": "pythonExample",
@@ -36,6 +18,12 @@
           }
         ]
       }
-    ]
+    ],
+    "ApiKeys": ["APIKeyOfYourChoice", "AnotherOneIfYouLike"],
+    "Server": {
+      "BaseUri": "http://172.17.0.1:5146",
+      "ApiKey": "APIKeyForTheServer"
+    },
+    "PythonRuntime": "libpython3.13.so"
   }
 }

src/Server/AIProvider.cs

@@ -13,7 +13,7 @@ public class AIProvider
 {
     private readonly ILogger<AIProvider> _logger;
     private readonly EmbeddingSearchOptions _configuration;
-    public Dictionary<string, AiProvider> aIProvidersConfiguration;
+    public Dictionary<string, AiProvider> AiProvidersConfiguration;
 
     public AIProvider(ILogger<AIProvider> logger, IOptions<EmbeddingSearchOptions> configuration)
     {
@@ -27,16 +27,21 @@ public class AIProvider
         }
         else
         {
-            aIProvidersConfiguration = retrievedAiProvidersConfiguration;
+            AiProvidersConfiguration = retrievedAiProvidersConfiguration;
         }
     }
 
-    public float[] GenerateEmbeddings(string modelUri, string[] input)
+    public float[] GenerateEmbeddings(string modelUri, string input)
+    {
+        return [.. GenerateEmbeddings(modelUri, [input]).First()];
+    }
+
+    public IEnumerable<float[]> GenerateEmbeddings(string modelUri, string[] input)
     {
         Uri uri = new(modelUri);
         string provider = uri.Scheme;
         string model = uri.AbsolutePath;
-        AiProvider? aIProvider = aIProvidersConfiguration
+        AiProvider? aIProvider = AiProvidersConfiguration
             .FirstOrDefault(x => string.Equals(x.Key.ToLower(), provider.ToLower()))
             .Value;
         if (aIProvider is null)
@@ -103,13 +108,123 @@ public class AIProvider
         try
         {
             JObject responseContentJson = JObject.Parse(responseContent);
-            JToken? responseContentTokens = responseContentJson.SelectToken(embeddingsJsonPath);
-            if (responseContentTokens is null)
+            List<JToken>? responseContentTokens = [.. responseContentJson.SelectTokens(embeddingsJsonPath)];
+            if (responseContentTokens is null || responseContentTokens.Count == 0)
             {
-                _logger.LogError("Unable to select tokens using JSONPath {embeddingsJsonPath} for string: {responseContent}.", [embeddingsJsonPath, responseContent]);
-                throw new JSONPathSelectionException(embeddingsJsonPath, responseContent);
+                if (responseContentJson.TryGetValue("error", out JToken? errorMessageJson) && errorMessageJson is not null)
+                {
+                    string errorMessage = errorMessageJson.Value<string>() ?? "";
+                    _logger.LogError("Unable to retrieve embeddings due to error: {errorMessage}", [errorMessage]);
+                    throw new Exception($"Unable to retrieve embeddings due to error: {errorMessage}");
+                    
+                } else
+                {
+                    _logger.LogError("Unable to select tokens using JSONPath {embeddingsJsonPath} for string: {responseContent}.", [embeddingsJsonPath, responseContent]);
+                    throw new JSONPathSelectionException(embeddingsJsonPath, responseContent);
+                }
             }
-            return [.. responseContentTokens.Values<float>()];
+            return [.. responseContentTokens.Select(token => token.ToObject<float[]>() ?? throw new Exception("Unable to cast embeddings response to float[]"))];
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError("Unable to parse the response to valid embeddings. {ex.Message}", [ex.Message]);
+            throw;
+        }
+    }
+
+    public IEnumerable<(int index, float score)> Rerank(string modelUri, string input, string[] documents, int topN)
+    {
+        Uri uri = new(modelUri);
+        string provider = uri.Scheme;
+        string model = uri.AbsolutePath;
+        AiProvider? aIProvider = AiProvidersConfiguration
+            .FirstOrDefault(x => string.Equals(x.Key.ToLower(), provider.ToLower()))
+            .Value;
+        if (aIProvider is null)
+        {
+            _logger.LogError("Model provider {provider} not found in configuration. Requested model: {modelUri}", [provider, modelUri]);
+            throw new ServerConfigurationException($"Model provider {provider} not found in configuration. Requested model: {modelUri}");
+        }
+        using var httpClient = new HttpClient();
+        httpClient.Timeout = TimeSpan.FromMinutes(150);
+
+        string indexJsonPath = "";
+        string scoreJsonPath = "";
+        IEnumerable<(string, float)> values = [];
+        Uri baseUri = new(aIProvider.BaseURL);
+        Uri requestUri;
+        IRerankRequestBody rerankRequestBody;
+        string[][] requestHeaders = [];
+        switch (aIProvider.Handler)
+        {
+            case "openai":
+                indexJsonPath = "$.results[*].index";
+                scoreJsonPath = "$.results[*].relevance_score";
+                requestUri = new Uri(baseUri, "/v1/rerank");
+                rerankRequestBody = new OpenAIRerankRequestBody()
+                {
+                    model = model,
+                    query = input,
+                    documents = documents,
+                    top_n = topN
+                };
+                if (aIProvider.ApiKey is not null)
+                {
+                    requestHeaders = [
+                        ["Authorization", $"Bearer {aIProvider.ApiKey}"]
+                    ];
+                }
+                break;
+            default:
+                _logger.LogError("Invalid reranking handler {aIProvider.Handler} in AiProvider {provider}.", [aIProvider.Handler, provider]);
+                throw new ServerConfigurationException($"Unknown handler {aIProvider.Handler} in AiProvider {provider}.");
+        }
+        var requestContent = new StringContent(
+            JsonConvert.SerializeObject(rerankRequestBody),
+            Encoding.UTF8,
+            "application/json"
+        );
+
+        var request = new HttpRequestMessage()
+        {
+            RequestUri = requestUri,
+            Method = HttpMethod.Post,
+            Content = requestContent
+        };
+        
+        foreach (var header in requestHeaders)
+        {
+            request.Headers.Add(header[0], header[1]);
+        }
+        HttpResponseMessage response = httpClient.PostAsync(requestUri, requestContent).Result;
+        string responseContent = response.Content.ReadAsStringAsync().Result;
+        try
+        {
+            JObject responseContentJson = JObject.Parse(responseContent);
+            List<JToken>? responseContentIndexTokens = [.. responseContentJson.SelectTokens(indexJsonPath)];
+            List<JToken>? responseContentScoreTokens = [.. responseContentJson.SelectTokens(scoreJsonPath)];
+            if (responseContentIndexTokens is null || responseContentIndexTokens.Count == 0
+                || responseContentScoreTokens is null || responseContentScoreTokens.Count == 0)
+            {
+                if (responseContentJson.TryGetValue("error", out JToken? errorMessageJson) && errorMessageJson is not null)
+                {
+                    string errorMessage = (string?)errorMessageJson.Value<string>("message") ?? "";
+                    string errorCode = (string?)errorMessageJson.Value<string>("code") ?? "";
+                    string errorType = (string?)errorMessageJson.Value<string>("type") ?? "";
+                    _logger.LogError("Unable to retrieve reranking results due to error: {errorCode} - {errorMessage} - {errorType}", [errorCode, errorMessage, errorType]);
+                    throw new Exception($"Unable to retrieve reranking results due to error: {errorMessage}");
+                    
+                } else
+                {
+                    _logger.LogError("Unable to select tokens using JSONPath {indexJsonPath} for string: {responseContent}.", [indexJsonPath, responseContent]);
+                    throw new JSONPathSelectionException(indexJsonPath, responseContent);
+                }
+            }
+            IEnumerable<int> indices = responseContentIndexTokens.Select(token => token.ToObject<int>());
+            IEnumerable<float> scores = responseContentScoreTokens.Select(token => token.ToObject<float>());
+            IEnumerable<(int index, float score)> zipped = indices.Zip(scores, (index, score) => (index, score));
+            
+            return zipped;
         }
         catch (Exception ex)
         {
@@ -120,7 +235,7 @@ public class AIProvider
 
     public string[] GetModels()
     {
-        var aIProviders = aIProvidersConfiguration;
+        var aIProviders = AiProvidersConfiguration;
         List<string> results = [];
         foreach (KeyValuePair<string, AiProvider> aIProviderKV in aIProviders)
         {
@@ -225,4 +340,16 @@ public class OpenAIEmbedRequestBody : IEmbedRequestBody
 {
     public required string model { get; set; }
     public required string[] input { get; set; }
+}
+
+
+public interface IRerankRequestBody { }
+
+
+public class OpenAIRerankRequestBody : IRerankRequestBody
+{
+    public required string model { get; set; }
+    public required string query { get; set; }
+    public required int top_n { get; set; }
+    public required string[] documents { get; set; }
 }

src/Server/Controllers/EntityController.cs

@@ -14,6 +14,9 @@ public class EntityController : ControllerBase
     private SearchdomainManager _domainManager;
     private readonly SearchdomainHelper _searchdomainHelper;
     private readonly DatabaseHelper _databaseHelper;
+    private readonly Dictionary<string, EntityIndexSessionData> _sessions = [];
+    private readonly object _sessionLock = new();
+    private const int SessionTimeoutMinutes = 60; // TODO: remove magic number; add an optional configuration option
 
     public EntityController(ILogger<EntityController> logger, IConfiguration config, SearchdomainManager domainManager, SearchdomainHelper searchdomainHelper, DatabaseHelper databaseHelper)
     {
@@ -46,34 +49,34 @@ public class EntityController : ControllerBase
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
         EntityListResults entityListResults = new() {Results = [], Success = true};
-        foreach (Entity entity in searchdomain_.entityCache)
+        foreach ((string _, Entity entity) in searchdomain_.EntityCache)
         {
             List<AttributeResult> attributeResults = [];
-            foreach (KeyValuePair<string, string> attribute in entity.attributes)
+            foreach (KeyValuePair<string, string> attribute in entity.Attributes)
             {
                 attributeResults.Add(new AttributeResult() {Name = attribute.Key, Value = attribute.Value});
             }
             List<DatapointResult> datapointResults = [];
-            foreach (Datapoint datapoint in entity.datapoints)
+            foreach (Datapoint datapoint in entity.Datapoints)
             {
                 if (returnModels)
                 {
                     List<EmbeddingResult> embeddingResults = [];
-                    foreach ((string, float[]) embedding in datapoint.embeddings)
+                    foreach ((string, float[]) embedding in datapoint.Embeddings)
                     {
                         embeddingResults.Add(new EmbeddingResult() {Model = embedding.Item1, Embeddings = returnEmbeddings ? embedding.Item2 : []});
                     }
-                    datapointResults.Add(new DatapointResult() {Name = datapoint.name, ProbMethod = datapoint.probMethod.name, SimilarityMethod = datapoint.similarityMethod.name, Embeddings = embeddingResults});
+                    datapointResults.Add(new DatapointResult() {Name = datapoint.Name, ProbMethod = datapoint.ProbMethod.Name, SimilarityMethod = datapoint.SimilarityMethod.Name, Embeddings = embeddingResults});
                 }
                 else
                 {
-                    datapointResults.Add(new DatapointResult() {Name = datapoint.name, ProbMethod = datapoint.probMethod.name, SimilarityMethod = datapoint.similarityMethod.name, Embeddings = null});
+                    datapointResults.Add(new DatapointResult() {Name = datapoint.Name, ProbMethod = datapoint.ProbMethod.Name, SimilarityMethod = datapoint.SimilarityMethod.Name, Embeddings = null});
                 }
             }
             EntityListResult entityListResult = new()
             {
-                Name = entity.name,
-                ProbMethod = entity.probMethodName,
+                Name = entity.Name,
+                ProbMethod = entity.ProbMethodName,
                 Attributes = attributeResults,
                 Datapoints = datapointResults
             };
@@ -86,67 +89,182 @@ public class EntityController : ControllerBase
     /// Index entities
     /// </summary>
     /// <remarks>
-    /// Behavior: Creates new entities, but overwrites existing entities that have the same name
+    /// Behavior: Updates the index using the provided entities. Creates new entities, overwrites existing entities with the same name, and deletes entities that are not part of the index anymore.
+    /// 
+    /// Can be executed in a single request or in multiple chunks using a (self-defined) session UUID string.
+    /// 
+    /// For session-based chunk uploads:
+    /// - Provide sessionId to accumulate entities across multiple requests
+    /// - Set sessionComplete=true on the final request to finalize and delete entities that are not in the accumulated list
+    /// - Without sessionId: Missing entities will be deleted from the searchdomain.
+    /// - Sessions expire after 60 minutes of inactivity (or as otherwise configured in the appsettings)
     /// </remarks>
     /// <param name="jsonEntities">Entities to index</param>
+    /// <param name="sessionId">Optional session ID for batch uploads across multiple requests</param>
+    /// <param name="sessionComplete">If true, finalizes the session and deletes entities not in the accumulated list</param>
     [HttpPut("/Entities")]
-    public ActionResult<EntityIndexResult> Index([FromBody] List<JSONEntity>? jsonEntities)
+    public async Task<ActionResult<EntityIndexResult>> Index(
+        [FromBody] List<JSONEntity>? jsonEntities,
+        string? sessionId = null,
+        bool sessionComplete = false)
     {
         try
         {
-            List<Entity>? entities = _searchdomainHelper.EntitiesFromJSON(
+            if (sessionId is null || string.IsNullOrWhiteSpace(sessionId))
+            {
+                sessionId = Guid.NewGuid().ToString(); // Create a short-lived session
+                sessionComplete = true; // If no sessionId was set, there is no trackable session. The pseudo-session ends here.
+            }
+            // Periodic cleanup of expired sessions
+            CleanupExpiredEntityIndexSessions();
+            EntityIndexSessionData session = GetOrCreateEntityIndexSession(sessionId);
+
+            if (jsonEntities is null && !sessionComplete)
+            {
+                return BadRequest(new EntityIndexResult() { Success = false, Message = "jsonEntities can only be null for a complete session" });
+            } else if (jsonEntities is null && sessionComplete)
+            {
+                await EntityIndexSessionDeleteUnindexedEntities(session);
+                return Ok(new EntityIndexResult() { Success = true });
+            }
+
+            // Standard entity indexing (upsert behavior)
+            List<Entity>? entities = await _searchdomainHelper.EntitiesFromJSON(
                 _domainManager,
                 _logger,
                 JsonSerializer.Serialize(jsonEntities));
             if (entities is not null && jsonEntities is not null)
             {
-                List<string> invalidatedSearchdomains = [];
-                foreach (var jsonEntity in jsonEntities)
+                session.AccumulatedEntities.AddRange(entities);
+
+                if (sessionComplete)
                 {
-                    string jsonEntityName = jsonEntity.Name;
-                    string jsonEntitySearchdomainName = jsonEntity.Searchdomain;
-                    if (entities.Select(x => x.name == jsonEntityName).Any()
-                        && !invalidatedSearchdomains.Contains(jsonEntitySearchdomainName))
-                    {
-                        invalidatedSearchdomains.Add(jsonEntitySearchdomainName);
-                    }
+                    await EntityIndexSessionDeleteUnindexedEntities(session);
                 }
+
                 return Ok(new EntityIndexResult() { Success = true });
             }
             else
             {
                 _logger.LogError("Unable to deserialize an entity");
+                ElmahCore.ElmahExtensions.RaiseError(new Exception("Unable to deserialize an entity"));
                 return Ok(new EntityIndexResult() { Success = false, Message = "Unable to deserialize an entity"});
             }
         } catch (Exception ex)
         {
             if (ex.InnerException is not null) ex = ex.InnerException;
             _logger.LogError("Unable to index the provided entities. {ex.Message} - {ex.StackTrace}", [ex.Message, ex.StackTrace]);
+            ElmahCore.ElmahExtensions.RaiseError(ex);
             return Ok(new EntityIndexResult() { Success = false, Message = ex.Message });
         }
 
     }
 
+    private async Task EntityIndexSessionDeleteUnindexedEntities(EntityIndexSessionData session)
+    {
+        var entityGroupsBySearchdomain = session.AccumulatedEntities.GroupBy(e => e.Searchdomain);
+
+        foreach (var entityGroup in entityGroupsBySearchdomain)
+        {
+            string searchdomainName = entityGroup.Key;
+            var entityNamesInRequest = entityGroup.Select(e => e.Name).ToHashSet();
+
+            (Searchdomain? searchdomain_, int? httpStatusCode, string? message) =
+                SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomainName, _logger);
+
+            if (searchdomain_ is not null && httpStatusCode is null) // If getting searchdomain was successful
+            {
+                var entitiesToDelete = searchdomain_.EntityCache
+                    .Where(kvp => !entityNamesInRequest.Contains(kvp.Value.Name))
+                    .Select(kvp => kvp.Value)
+                    .ToList();
+
+                foreach (var entity in entitiesToDelete)
+                {
+                    searchdomain_.ReconciliateOrInvalidateCacheForDeletedEntity(entity);
+                    await _databaseHelper.RemoveEntity(
+                        [],
+                        _domainManager.Helper,
+                        entity.Name,
+                        searchdomainName);
+                    searchdomain_.EntityCache.TryRemove(entity.Name, out _);
+                    _logger.LogInformation("Deleted entity {entityName} from {searchdomain}", entity.Name, searchdomainName);
+                }
+            }
+            else
+            {
+                _logger.LogWarning("Unable to delete entities for searchdomain {searchdomain}", searchdomainName);
+            }
+        }
+    }
+
     /// <summary>
     /// Deletes an entity
     /// </summary>
     /// <param name="searchdomain">Name of the searchdomain</param>
     /// <param name="entityName">Name of the entity</param>
     [HttpDelete]
-    public ActionResult<EntityDeleteResults> Delete(string searchdomain, string entityName)
+    public async Task<ActionResult<EntityDeleteResults>> Delete(string searchdomain, string entityName)
     {
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
         
-        Entity? entity_ = SearchdomainHelper.CacheGetEntity(searchdomain_.entityCache, entityName);
+        Entity? entity_ = SearchdomainHelper.CacheGetEntity(searchdomain_.EntityCache, entityName);
         if (entity_ is null)
         {
             _logger.LogError("Unable to delete the entity {entityName} in {searchdomain} - it was not found under the specified name", [entityName, searchdomain]);
+            ElmahCore.ElmahExtensions.RaiseError(
+                new Exception(
+                    $"Unable to delete the entity {entityName} in {searchdomain} - it was not found under the specified name"
+                )
+            );
             return Ok(new EntityDeleteResults() {Success = false, Message = "Entity not found"});
         }
         searchdomain_.ReconciliateOrInvalidateCacheForDeletedEntity(entity_);
-        _databaseHelper.RemoveEntity([], _domainManager.helper, entityName, searchdomain);
-        searchdomain_.entityCache.RemoveAll(entity => entity.name == entityName);
-        return Ok(new EntityDeleteResults() {Success = true});
+        await _databaseHelper.RemoveEntity([], _domainManager.Helper, entityName, searchdomain);
+        
+        bool success = searchdomain_.EntityCache.TryRemove(entityName, out Entity? _);
+        
+        return Ok(new EntityDeleteResults() {Success = success});
+    }
+
+
+    private void CleanupExpiredEntityIndexSessions()
+    {
+        lock (_sessionLock)
+        {
+            var expiredSessions = _sessions
+                .Where(kvp => (DateTime.UtcNow - kvp.Value.LastInteractionAt).TotalMinutes > SessionTimeoutMinutes)
+                .Select(kvp => kvp.Key)
+                .ToList();
+            
+            foreach (var sessionId in expiredSessions)
+            {
+                _sessions.Remove(sessionId);
+                _logger.LogWarning("Removed expired, non-closed session {sessionId}", sessionId);
+            }
+        }
+    }
+
+    private EntityIndexSessionData GetOrCreateEntityIndexSession(string sessionId)
+    {
+        lock (_sessionLock)
+        {
+            if (!_sessions.TryGetValue(sessionId, out var session))
+            {
+                session = new EntityIndexSessionData();
+                _sessions[sessionId] = session;
+            } else
+            {
+                session.LastInteractionAt = DateTime.UtcNow;
+            }
+            return session;
+        }
     }
 }
+
+public class EntityIndexSessionData
+{
+    public List<Entity> AccumulatedEntities { get; set; } = [];
+    public DateTime LastInteractionAt { get; set; } = DateTime.UtcNow;
+}

src/Server/Controllers/Frontend/HomeController.cs

@@ -35,11 +35,11 @@ public class HomeController : Controller
 
     [Authorize]
     [HttpGet("Searchdomains")]
-    public IActionResult Searchdomains()
+    public async Task<ActionResult> Searchdomains()
     {
         HomeIndexViewModel viewModel = new()
         {
-            Searchdomains = _domainManager.ListSearchdomains()
+            Searchdomains = await _domainManager.ListSearchdomainsAsync()
         };
         return View(viewModel);
     }

src/Server/Controllers/SearchdomainController.cs

@@ -5,6 +5,7 @@ using Microsoft.AspNetCore.Http.HttpResults;
 using Microsoft.AspNetCore.Mvc;
 using Server.Exceptions;
 using Server.Helper;
+using Shared;
 using Shared.Models;
 
 namespace Server.Controllers;
@@ -28,12 +29,12 @@ public class SearchdomainController : ControllerBase
     /// Lists all searchdomains
     /// </summary>
     [HttpGet("/Searchdomains")]
-    public ActionResult<SearchdomainListResults> List()
+    public async Task<ActionResult<SearchdomainListResults>> List()
     {
         List<string> results;
         try
         {
-            results = _domainManager.ListSearchdomains();
+            results = await _domainManager.ListSearchdomainsAsync();
         }
         catch (Exception)
         {
@@ -50,11 +51,15 @@ public class SearchdomainController : ControllerBase
     /// <param name="searchdomain">Name of the searchdomain</param>
     /// <param name="settings">Optional initial settings</param>
     [HttpPost]
-    public ActionResult<SearchdomainCreateResults> Create([Required]string searchdomain, [FromBody]SearchdomainSettings settings = new())
+    public async Task<ActionResult<SearchdomainCreateResults>> Create([Required]string searchdomain, [FromBody]SearchdomainSettings settings = new())
     {
         try
         {
-            int id = _domainManager.CreateSearchdomain(searchdomain, settings);
+            if (settings.QueryCacheSize <= 0)
+            {
+                settings.QueryCacheSize = 1_000_000; // TODO get rid of this magic number
+            }
+            int id = await _domainManager.CreateSearchdomain(searchdomain, settings);
             return Ok(new SearchdomainCreateResults(){Id = id, Success = true});
         } catch (Exception)
         {
@@ -68,7 +73,7 @@ public class SearchdomainController : ControllerBase
     /// </summary>
     /// <param name="searchdomain">Name of the searchdomain</param>
     [HttpDelete]
-    public ActionResult<SearchdomainDeleteResults> Delete([Required]string searchdomain)
+    public async Task<ActionResult<SearchdomainDeleteResults>> Delete([Required]string searchdomain)
     {
         bool success;
         int deletedEntries;
@@ -76,7 +81,7 @@ public class SearchdomainController : ControllerBase
         try
         {
             success = true;
-            deletedEntries = _domainManager.DeleteSearchdomain(searchdomain);
+            deletedEntries = await _domainManager.DeleteSearchdomain(searchdomain);
         }
         catch (SearchdomainNotFoundException ex)
         {
@@ -104,7 +109,7 @@ public class SearchdomainController : ControllerBase
     /// <param name="newName">Updated name of the searchdomain</param>
     /// <param name="settings">Updated settings of searchdomain</param>
     [HttpPut]
-    public ActionResult<SearchdomainUpdateResults> Update([Required]string searchdomain, string newName, [FromBody]SearchdomainSettings? settings)
+    public async Task<ActionResult<SearchdomainUpdateResults>> Update([Required]string searchdomain, string newName, [FromBody]SearchdomainSettings? settings)
     {
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
@@ -113,18 +118,18 @@ public class SearchdomainController : ControllerBase
             Dictionary<string, dynamic> parameters = new()
             {
                 {"name", newName},
-                {"id", searchdomain_.id}
+                {"id", searchdomain_.Id}
             };
-            searchdomain_.helper.ExecuteSQLNonQuery("UPDATE searchdomain set name = @name WHERE id = @id", parameters);
+            await searchdomain_.Helper.ExecuteSQLNonQuery("UPDATE searchdomain set name = @name WHERE id = @id", parameters);
         } else
         {
             Dictionary<string, dynamic> parameters = new()
             {
                 {"name", newName},
                 {"settings", settings},
-                {"id", searchdomain_.id}
+                {"id", searchdomain_.Id}
             };
-            searchdomain_.helper.ExecuteSQLNonQuery("UPDATE searchdomain set name = @name, settings = @settings WHERE id = @id", parameters);            
+            await searchdomain_.Helper.ExecuteSQLNonQuery("UPDATE searchdomain set name = @name, settings = @settings WHERE id = @id", parameters);            
         }
         return Ok(new SearchdomainUpdateResults(){Success = true});
     }
@@ -134,13 +139,85 @@ public class SearchdomainController : ControllerBase
     /// </summary>
     /// <param name="searchdomain">Name of the searchdomain</param>
     [HttpGet("Queries")]
-    public ActionResult<SearchdomainSearchesResults> GetQueries([Required]string searchdomain)
+    public ActionResult<SearchdomainQueriesResults> GetQueries([Required]string searchdomain)
     {
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
-        Dictionary<string, DateTimedSearchResult> searchCache = searchdomain_.searchCache;
+        Dictionary<string, DateTimedSearchResult> searchCache = searchdomain_.QueryCache.AsDictionary();
         
-        return Ok(new SearchdomainSearchesResults() { Searches = searchCache, Success = true });
+        return Ok(new SearchdomainQueriesResults() { Searches = searchCache, Success = true });
+    }
+
+
+
+    /// <summary>
+    /// Executes a query in the searchdomain and reranks the result using a specified reranker
+    /// </summary>
+    /// <param name="searchdomain">Name of the searchdomain</param>
+    /// <param name="query">Query to execute</param>
+    /// <param name="topN">Return only the top N results</param>
+    /// <param name="returnAttributes">Return the attributes of the object</param>
+    [HttpPost("QueryReranked")]
+    public ActionResult<EntityRerankResults> QueryReranked([Required]string searchdomain, [Required]string query, [Required]string rerankerModel, int topN, int topNRetrieval, ProbMethodEnum probMethod = ProbMethodEnum.HVEWAvg, bool returnAttributes = false)
+    {
+        
+        (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
+        if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
+        List<(float, string)> results = searchdomain_.Search(query, topNRetrieval);
+        List<(string Name, Dictionary<string, string> Attributes)> queryResults = [.. results.Select(r => (
+            Name: r.Item2,
+            Attributes: searchdomain_.EntityCache[r.Item2]?.Attributes ?? []
+        ))];
+
+
+        // Key: Attribute name
+        Dictionary<string, List<(string EntityName, string AttributeValue)>> resultsByAttribute = [];
+        queryResults.ForEach(r =>
+        {
+            foreach (var kv in r.Attributes)
+            {
+                if (!resultsByAttribute.TryGetValue(kv.Key, out List<(string EntityName, string AttributeValue)>? values) || values is null)
+                {
+                    values = [];
+                    resultsByAttribute[kv.Key] = values;
+                }
+                values.Add((r.Name, kv.Value));
+            }
+        });
+
+        // Key: EntityName
+        Dictionary<string, List<(string attribute, float score)>> scoresByEntity = [];
+        foreach (var kv in resultsByAttribute)
+        {
+            string attributeName = kv.Key;
+            List<(string EntityName, string AttributeValue)> nameValuePairs = kv.Value;
+            
+            List<string> documents = [.. nameValuePairs.Select(r => r.AttributeValue)];
+            List<(int index, float score)> rerankResults = [.. searchdomain_.AiProvider.Rerank(rerankerModel, query, [.. documents], topN)];
+            List<(string entityName, float score)> rerankedScores = [.. rerankResults.Select(r => (nameValuePairs.ElementAt(r.index).EntityName, r.score))];
+            foreach ((string entityName, float score) in rerankedScores)
+            {
+                if (!scoresByEntity.TryGetValue(entityName, out List<(string attribute, float score)>? values) || values is null)
+                {
+                    values = [];
+                    scoresByEntity[entityName] = values;
+                }
+                values.Add((attributeName, score));
+            }
+        }
+        List<EntityRerankResult> entityRerankResults = [.. scoresByEntity.Select(scoreKV =>
+        {
+            string entityName = scoreKV.Key;
+            float score = new ProbMethod(probMethod).Method(scoreKV.Value);
+            return new EntityRerankResult()
+            {
+                Name = entityName,
+                Value = score,
+                Attributes = returnAttributes ? (searchdomain_.EntityCache[entityName]?.Attributes ?? []) : null
+            };
+        })];
+        
+        return Ok(new EntityRerankResults(){Results = entityRerankResults, Success = true });
     }
 
     /// <summary>
@@ -160,7 +237,7 @@ public class SearchdomainController : ControllerBase
         {
             Name = r.Item2,
             Value = r.Item1,
-            Attributes = returnAttributes ? (searchdomain_.entityCache.FirstOrDefault(x => x.name == r.Item2)?.attributes ?? null) : null
+            Attributes = returnAttributes ? (searchdomain_.EntityCache[r.Item2]?.Attributes ?? null) : null
         })];
         return Ok(new EntityQueryResults(){Results = queryResults, Success = true });
     }
@@ -175,7 +252,7 @@ public class SearchdomainController : ControllerBase
     {
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
-        Dictionary<string, DateTimedSearchResult> searchCache = searchdomain_.searchCache;
+        EnumerableLruCache<string, DateTimedSearchResult> searchCache = searchdomain_.QueryCache;
         bool containsKey = searchCache.ContainsKey(query);
         if (containsKey)
         {
@@ -196,7 +273,7 @@ public class SearchdomainController : ControllerBase
     {
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
-        Dictionary<string, DateTimedSearchResult> searchCache = searchdomain_.searchCache;
+        EnumerableLruCache<string, DateTimedSearchResult> searchCache = searchdomain_.QueryCache;
         bool containsKey = searchCache.ContainsKey(query);
         if (containsKey)
         {
@@ -217,7 +294,7 @@ public class SearchdomainController : ControllerBase
     {
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
-        SearchdomainSettings settings = searchdomain_.settings;
+        SearchdomainSettings settings = searchdomain_.Settings;
         return Ok(new SearchdomainSettingsResults() { Settings = settings, Success = true });
     }
 
@@ -225,18 +302,20 @@ public class SearchdomainController : ControllerBase
     /// Update the settings of a searchdomain
     /// </summary>
     /// <param name="searchdomain">Name of the searchdomain</param>
+    /// <param name="request">Settings to apply to the searchdomain</param>
     [HttpPut("Settings")]
-    public ActionResult<SearchdomainUpdateResults> UpdateSettings([Required]string searchdomain, [Required][FromBody] SearchdomainSettings request)
+    public async Task<ActionResult<SearchdomainUpdateResults>> UpdateSettings([Required]string searchdomain, [Required][FromBody] SearchdomainSettings request)
     {
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
         Dictionary<string, dynamic> parameters = new()
         {
             {"settings", JsonSerializer.Serialize(request)},
-            {"id", searchdomain_.id}
+            {"id", searchdomain_.Id}
         };
-        searchdomain_.helper.ExecuteSQLNonQuery("UPDATE searchdomain set settings = @settings WHERE id = @id", parameters);
-        searchdomain_.settings = request;
+        await searchdomain_.Helper.ExecuteSQLNonQuery("UPDATE searchdomain set settings = @settings WHERE id = @id", parameters);
+        searchdomain_.Settings = request;
+        searchdomain_.QueryCache.Capacity = request.QueryCacheSize;
         return Ok(new SearchdomainUpdateResults(){Success = true});
     }
 
@@ -245,15 +324,17 @@ public class SearchdomainController : ControllerBase
     /// </summary>
     /// <param name="searchdomain">Name of the searchdomain</param>
     [HttpGet("QueryCache/Size")]
-    public ActionResult<SearchdomainSearchCacheSizeResults> GetSearchCacheSize([Required]string searchdomain)
+    public ActionResult<SearchdomainQueryCacheSizeResults> GetQueryCacheSize([Required]string searchdomain)
     {
         if (!SearchdomainHelper.IsSearchdomainLoaded(_domainManager, searchdomain))
         {
-            return Ok(new SearchdomainSearchCacheSizeResults() { QueryCacheSizeBytes = 0, Success = true });
+            return Ok(new SearchdomainQueryCacheSizeResults() { SizeBytes = 0, ElementCount = 0, ElementMaxCount = 0, Success = true });
         }
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
-        return Ok(new SearchdomainSearchCacheSizeResults() { QueryCacheSizeBytes = searchdomain_.GetSearchCacheSize(), Success = true });
+        int elementCount = searchdomain_.QueryCache.Count;
+        int ElementMaxCount = searchdomain_.Settings.QueryCacheSize;
+        return Ok(new SearchdomainQueryCacheSizeResults() { SizeBytes = searchdomain_.GetSearchCacheSize(), ElementCount = elementCount, ElementMaxCount = ElementMaxCount, Success = true });
     }
 
     /// <summary>
@@ -278,7 +359,7 @@ public class SearchdomainController : ControllerBase
     {
         (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_domainManager, searchdomain, _logger);
         if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new SearchdomainUpdateResults(){Success = false, Message = message});
-        long sizeInBytes = DatabaseHelper.GetSearchdomainDatabaseSize(searchdomain_.helper, searchdomain);
-        return Ok(new SearchdomainGetDatabaseSizeResult() { SearchdomainDatabaseSizeBytes = sizeInBytes, Success = true });        
+        long EmbeddingCacheUtilization = DatabaseHelper.GetSearchdomainDatabaseSize(searchdomain_.Helper, searchdomain);
+        return Ok(new SearchdomainGetDatabaseSizeResult() { SearchdomainDatabaseSizeBytes = EmbeddingCacheUtilization, Success = true });        
     }
 }

src/Server/Controllers/ServerController.cs

@@ -1,14 +1,11 @@
 namespace Server.Controllers;
 
-using System.Reflection;
-using System.Text.Json;
-using AdaptiveExpressions;
 using ElmahCore;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Options;
-using Server.Exceptions;
 using Server.Helper;
 using Server.Models;
+using Shared;
 using Shared.Models;
 
 [ApiController]
@@ -61,36 +58,59 @@ public class ServerController : ControllerBase
             long size = 0;
             long elementCount = 0;
             long embeddingsCount = 0;
-            LRUCache<string, Dictionary<string, float[]>> embeddingCache = _searchdomainManager.embeddingCache;
-            var cacheListField = embeddingCache.GetType()
-                .GetField("_cacheList", BindingFlags.Instance | BindingFlags.NonPublic) ?? throw new InvalidOperationException("_cacheList field not found"); // TODO Remove this unsafe reflection atrocity
-            LinkedList<string> cacheListOriginal = (LinkedList<string>)cacheListField.GetValue(embeddingCache)!;
-            LinkedList<string> cacheList = new(cacheListOriginal);
+            EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache = _searchdomainManager.EmbeddingCache;
 
-            foreach (string key in cacheList)
+            foreach (KeyValuePair<string, Dictionary<string, float[]>> kv in embeddingCache)
             {
-                if (!embeddingCache.TryGet(key, out var entry))
-                    continue;
-
-                // estimate size
+                string key = kv.Key;
+                Dictionary<string, float[]> entry = kv.Value;
                 size += EstimateEntrySize(key, entry);
                 elementCount++;
                 embeddingsCount += entry.Keys.Count;
             }
-            var sqlHelper = DatabaseHelper.GetSQLHelper(_options.Value);
+            var sqlHelper = _searchdomainManager.Helper;
+            var databaseTotalSize = DatabaseHelper.GetTotalDatabaseSize(sqlHelper);
             Task<long> entityCountTask = DatabaseHelper.CountEntities(sqlHelper);
             long queryCacheUtilization = 0;
-            foreach (string searchdomain in _searchdomainManager.ListSearchdomains())
+            long queryCacheElementCount = 0;
+            long queryCacheMaxElementCountAll = 0;
+            long queryCacheMaxElementCountLoadedSearchdomainsOnly = 0;
+            foreach (string searchdomain in await _searchdomainManager.ListSearchdomainsAsync())
             {
                 if (SearchdomainHelper.IsSearchdomainLoaded(_searchdomainManager, searchdomain))
                 {
                     (Searchdomain? searchdomain_, int? httpStatusCode, string? message) = SearchdomainHelper.TryGetSearchdomain(_searchdomainManager, searchdomain, _logger);
                     if (searchdomain_ is null || httpStatusCode is not null) return StatusCode(httpStatusCode ?? 500, new ServerGetStatsResult(){Success = false, Message = message});
                     queryCacheUtilization += searchdomain_.GetSearchCacheSize();
+                    queryCacheElementCount += searchdomain_.QueryCache.Count;
+                    queryCacheMaxElementCountAll += searchdomain_.QueryCache.Capacity;
+                    queryCacheMaxElementCountLoadedSearchdomainsOnly += searchdomain_.QueryCache.Capacity;
+                } else
+                {
+                    var searchdomainSettings = DatabaseHelper.GetSearchdomainSettings(sqlHelper, searchdomain);
+                    queryCacheMaxElementCountAll += searchdomainSettings.QueryCacheSize;
                 }
             };
             long entityCount = await entityCountTask;
-            return new ServerGetStatsResult() { Success = true, EntityCount = entityCount, QueryCacheUtilization = queryCacheUtilization, SizeInBytes = size, MaxElementCount = _searchdomainManager.EmbeddingCacheMaxCount, ElementCount = elementCount, EmbeddingsCount = embeddingsCount};
+            GC.Collect();
+            GC.WaitForPendingFinalizers();
+            GC.Collect();
+            long ramTotalSize = GC.GetTotalMemory(false);
+            
+            return new ServerGetStatsResult() {
+                Success = true,
+                EntityCount = entityCount,
+                QueryCacheUtilization = queryCacheUtilization,
+                QueryCacheElementCount = queryCacheElementCount,
+                QueryCacheMaxElementCountAll = queryCacheMaxElementCountAll,
+                QueryCacheMaxElementCountLoadedSearchdomainsOnly = queryCacheMaxElementCountLoadedSearchdomainsOnly,
+                EmbeddingCacheUtilization = size,
+                EmbeddingCacheMaxElementCount = _searchdomainManager.EmbeddingCacheMaxCount,
+                EmbeddingCacheElementCount = elementCount,
+                EmbeddingsCount = embeddingsCount,
+                DatabaseTotalSize = databaseTotalSize,
+                RamTotalSize = ramTotalSize
+            };
         } catch (Exception ex)
         {
             ElmahExtensions.RaiseError(ex);

src/Server/Datapoint.cs

@@ -1,61 +1,141 @@
-using AdaptiveExpressions;
-using OllamaSharp;
-using OllamaSharp.Models;
+using System.Collections.Concurrent;
+using Shared;
+using Shared.Models;
 
 namespace Server;
 
 public class Datapoint
 {
-    public string name;
-    public ProbMethod probMethod;
-    public SimilarityMethod similarityMethod;
-    public List<(string, float[])> embeddings;
-    public string hash;
+    public string Name;
+    public ProbMethod ProbMethod;
+    public SimilarityMethod SimilarityMethod;
+    public List<(string, float[])> Embeddings;
+    public string Hash;
+    public int Id;
 
-    public Datapoint(string name, ProbMethod probMethod, SimilarityMethod similarityMethod, string hash, List<(string, float[])> embeddings)
+    public Datapoint(string name, ProbMethodEnum probMethod, SimilarityMethodEnum similarityMethod, string hash, List<(string, float[])> embeddings, int id)
     {
-        this.name = name;
-        this.probMethod = probMethod;
-        this.similarityMethod = similarityMethod;
-        this.hash = hash;
-        this.embeddings = embeddings;
+        Name = name;
+        ProbMethod = new ProbMethod(probMethod);
+        SimilarityMethod = new SimilarityMethod(similarityMethod);
+        Hash = hash;
+        Embeddings = embeddings;
+        Id = id;
+    }
+
+    public Datapoint(string name, ProbMethod probMethod, SimilarityMethod similarityMethod, string hash, List<(string, float[])> embeddings, int id)
+    {
+        Name = name;
+        ProbMethod = probMethod;
+        SimilarityMethod = similarityMethod;
+        Hash = hash;
+        Embeddings = embeddings;
+        Id = id;
     }
 
     public float CalcProbability(List<(string, float)> probabilities)
     {
-        return probMethod.method(probabilities);
+        return ProbMethod.Method(probabilities);
     }
 
-    public static Dictionary<string, float[]> GenerateEmbeddings(string content, List<string> models, AIProvider aIProvider)
+    public static Dictionary<string, float[]> GetEmbeddings(string content, ConcurrentBag<string> models, AIProvider aIProvider, EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache)
     {
-        return GenerateEmbeddings(content, models, aIProvider, new());
-    }
-
-    public static Dictionary<string, float[]> GenerateEmbeddings(string content, List<string> models, AIProvider aIProvider, LRUCache<string, Dictionary<string, float[]>> embeddingCache)
-    {
-        Dictionary<string, float[]> retVal = [];
+        Dictionary<string, float[]> embeddings = [];
+        bool embeddingCacheHasContent = embeddingCache.TryGetValue(content, out var embeddingCacheForContent);
+        if (!embeddingCacheHasContent || embeddingCacheForContent is null)
+        {
+            foreach (string model in models)
+            {
+                embeddings[model] = GenerateEmbeddings(content, model, aIProvider, embeddingCache);
+            }
+            return embeddings;
+        }
         foreach (string model in models)
         {
-            bool embeddingCacheHasModel = embeddingCache.TryGet(model, out var embeddingCacheForModel);
-            if (embeddingCacheHasModel && embeddingCacheForModel.ContainsKey(content))
+            bool embeddingCacheHasModel = embeddingCacheForContent.TryGetValue(model, out float[]? embeddingCacheForModel);
+            if (embeddingCacheHasModel && embeddingCacheForModel is not null)
             {
-                retVal[model] = embeddingCacheForModel[content];
-                continue;
-            }
-            var response = aIProvider.GenerateEmbeddings(model, [content]);
-            if (response is not null)
+                embeddings[model] = embeddingCacheForModel;
+            } else
             {
-                retVal[model] = response;
-                if (!embeddingCacheHasModel)
-                {
-                    embeddingCacheForModel = [];
-                }
-                if (!embeddingCacheForModel.ContainsKey(content))
-                {
-                    embeddingCacheForModel[content] = response;
-                }
+                embeddings[model] = GenerateEmbeddings(content, model, aIProvider, embeddingCache);
             }
         }
-        return retVal;
+        return embeddings;
+    }
+
+    public static Dictionary<string, Dictionary<string, float[]>> GetEmbeddings(string[] content, List<string> models, AIProvider aIProvider, EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache)
+    {
+        Dictionary<string, Dictionary<string, float[]>> embeddings = [];
+        foreach (string model in models)
+        {
+            List<string> toBeGenerated = [];
+            embeddings[model] = [];
+            foreach (string value in content)
+            {
+                bool generateThisEntry = true;
+                bool embeddingCacheHasContent = embeddingCache.TryGetValue(value, out var embeddingCacheForContent);
+                if (embeddingCacheHasContent && embeddingCacheForContent is not null)
+                {
+                    bool embeddingCacheHasModel = embeddingCacheForContent.TryGetValue(model, out float[]? embedding);
+                    if (embeddingCacheHasModel && embedding is not null)
+                    {
+                        embeddings[model][value] = embedding;
+                        generateThisEntry = false;
+                    }
+                }
+                if (generateThisEntry)
+                {
+                    if (!toBeGenerated.Contains(value))
+                    {
+                        toBeGenerated.Add(value);
+                    }
+                }
+            }
+            if (toBeGenerated.Count == 0)
+            {
+                continue;
+            }
+            IEnumerable<float[]> generatedEmbeddings = GenerateEmbeddings([.. toBeGenerated], model, aIProvider, embeddingCache);
+            if (generatedEmbeddings.Count() != toBeGenerated.Count)
+            {
+                throw new Exception("Requested embeddings count and generated embeddings count mismatched!");
+            }
+            for (int i = 0; i < toBeGenerated.Count; i++)
+            {
+                embeddings[model][toBeGenerated.ElementAt(i)] = generatedEmbeddings.ElementAt(i);
+            }
+        }
+        return embeddings;
+    }
+
+    public static IEnumerable<float[]> GenerateEmbeddings(string[] content, string model, AIProvider aIProvider, EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache)
+    {
+        IEnumerable<float[]> embeddings = aIProvider.GenerateEmbeddings(model, content);
+        if (embeddings.Count() != content.Length)
+        {
+            throw new Exception("Resulting embeddings count does not match up with request count");
+        }
+        for (int i = 0; i < content.Length; i++)
+        {
+            if (!embeddingCache.ContainsKey(content[i]))
+            {
+                embeddingCache[content[i]] = [];
+            }
+            embeddingCache[content[i]][model] = embeddings.ElementAt(i);
+        }
+        return embeddings;
+    }
+
+
+    public static float[] GenerateEmbeddings(string content, string model, AIProvider aIProvider, EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache)
+    {
+        float[] embeddings = aIProvider.GenerateEmbeddings(model, content);
+        if (!embeddingCache.ContainsKey(content))
+        {
+            embeddingCache[content] = [];
+        }
+        embeddingCache[content][model] = embeddings;
+        return embeddings;
     }
 }

src/Server/Dockerfile

@@ -1,10 +1,10 @@
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
 WORKDIR /build
 COPY . .
-RUN dotnet restore ./Server.csproj
-RUN dotnet publish ./Server.csproj -c Release -o /output
+RUN dotnet restore Server/Server.csproj
+RUN dotnet publish Server/Server.csproj -c Release -o /output
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS final
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS final
 WORKDIR /app
 COPY --from=build /output .
 ENV ASPNETCORE_ENVIRONMENT Docker

src/Server/Entity.cs

@@ -1,11 +1,14 @@
+using System.Collections.Concurrent;
+
 namespace Server;
 
-public class Entity(Dictionary<string, string> attributes, Probmethods.probMethodDelegate probMethod, string probMethodName, List<Datapoint> datapoints, string name)
+public class Entity(Dictionary<string, string> attributes, Probmethods.ProbMethodDelegate probMethod, string probMethodName, ConcurrentBag<Datapoint> datapoints, string name, string searchdomain)
 {
-    public Dictionary<string, string> attributes = attributes;
-    public Probmethods.probMethodDelegate probMethod = probMethod;
-    public string probMethodName = probMethodName;
-    public List<Datapoint> datapoints = datapoints;
-    public int id;
-    public string name = name;
+    public Dictionary<string, string> Attributes = attributes;
+    public Probmethods.ProbMethodDelegate ProbMethod = probMethod;
+    public string ProbMethodName = probMethodName;
+    public ConcurrentBag<Datapoint> Datapoints = datapoints;
+    public int Id;
+    public string Name = name;
+    public string Searchdomain = searchdomain;
 }

src/Server/HealthChecks/ServerHealthChecks.cs

@@ -12,33 +12,33 @@ public class DatabaseHealthCheck : IHealthCheck
         _searchdomainManager = searchdomainManager;
         _logger = logger;
     }
-    public Task<HealthCheckResult> CheckHealthAsync(
+    public async Task<HealthCheckResult> CheckHealthAsync(
         HealthCheckContext context, CancellationToken cancellationToken = default)
     {
         try
         {
-            DatabaseMigrations.DatabaseGetVersion(_searchdomainManager.helper);
+            DatabaseMigrations.DatabaseGetVersion(_searchdomainManager.Helper);
         }
         catch (Exception ex)
         {
             _logger.LogCritical("DatabaseHealthCheck - Exception occurred when retrieving and parsing database version: {ex}", ex.Message);
-            return Task.FromResult(
+            return await Task.FromResult(
                 HealthCheckResult.Unhealthy());
         }
 
         try
         {
-            _searchdomainManager.helper.ExecuteSQLNonQuery("INSERT INTO settings (name, value) VALUES ('test', 'x');", []);
-            _searchdomainManager.helper.ExecuteSQLNonQuery("DELETE FROM settings WHERE name = 'test';", []);
+            await _searchdomainManager.Helper.ExecuteSQLNonQuery("INSERT INTO settings (name, value) VALUES ('test', 'x');", []);
+            await _searchdomainManager.Helper.ExecuteSQLNonQuery("DELETE FROM settings WHERE name = 'test';", []);
         }
         catch (Exception ex)
         {
             _logger.LogCritical("DatabaseHealthCheck - Exception occurred when executing INSERT/DELETE query: {ex}", ex.Message);
-            return Task.FromResult(
+            return await Task.FromResult(
                 HealthCheckResult.Unhealthy());
         }
 
-        return Task.FromResult(
+        return await Task.FromResult(
             HealthCheckResult.Healthy());
     }
 }

src/Server/Helper/CacheHelper.cs

@@ -0,0 +1,241 @@
+using System.Configuration;
+using Microsoft.Data.Sqlite;
+using Microsoft.Extensions.Options;
+using OllamaSharp.Models;
+using Server.Models;
+using Shared;
+
+namespace Server.Helper;
+
+public static class CacheHelper
+{
+    public static EnumerableLruCache<string, Dictionary<string, float[]>> GetEmbeddingStore(EmbeddingSearchOptions options)
+    {
+        SQLiteHelper helper = new(options);
+        EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache = new((int)(options.Cache.StoreTopN ?? options.Cache.CacheTopN));
+        helper.ExecuteQuery(
+            "SELECT cache_key, model_key, embedding, idx FROM embedding_cache ORDER BY idx ASC", [], r =>
+            {
+                int embeddingOrdinal = r.GetOrdinal("embedding");
+                int length = (int)r.GetBytes(embeddingOrdinal, 0, null, 0, 0);
+                byte[] buffer = new byte[length];
+                r.GetBytes(embeddingOrdinal, 0, buffer, 0, length);
+                var cache_key = r.GetString(r.GetOrdinal("cache_key"));
+                var model_key = r.GetString(r.GetOrdinal("model_key"));
+                var embedding = SearchdomainHelper.FloatArrayFromBytes(buffer);
+                var index = r.GetInt32(r.GetOrdinal("idx"));
+                if (cache_key is null || model_key is null || embedding is null)
+                {
+                    throw new Exception("Unable to get the embedding store due to a returned element being null");
+                }
+                if (!embeddingCache.TryGetValue(cache_key, out Dictionary<string, float[]>? keyElement) || keyElement is null)
+                {
+                    keyElement = [];
+                    embeddingCache[cache_key] = keyElement;
+                }
+                keyElement[model_key] = embedding;
+                return 0;
+            }
+        );
+        embeddingCache.Capacity = (int)options.Cache.CacheTopN;
+        return embeddingCache;
+    }
+
+    public static async Task UpdateEmbeddingStore(EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache, EmbeddingSearchOptions options)
+    {
+        if (options.Cache.StoreTopN is not null)
+        {
+            embeddingCache.Capacity = (int)options.Cache.StoreTopN;
+        }
+        SQLiteHelper helper = new(options);
+        EnumerableLruCache<string, Dictionary<string, float[]>> embeddingStore = GetEmbeddingStore(options);
+
+
+        var embeddingCacheMappings = GetCacheMappings(embeddingCache);
+        var embeddingCacheIndexMap = embeddingCacheMappings.positionToEntry;
+        var embeddingCacheObjectMap = embeddingCacheMappings.entryToPosition;
+
+        var embeddingStoreMappings = GetCacheMappings(embeddingStore);
+        var embeddingStoreIndexMap = embeddingStoreMappings.positionToEntry;
+        var embeddingStoreObjectMap = embeddingStoreMappings.entryToPosition;
+
+        List<int> deletedEntries = [];
+
+        foreach (KeyValuePair<int, KeyValuePair<string, Dictionary<string, float[]>>> kv in embeddingStoreIndexMap)
+        {
+            int storeEntryIndex = kv.Key;
+            string storeEntryString = kv.Value.Key;
+            bool cacheEntryExists = embeddingCacheObjectMap.TryGetValue(storeEntryString, out int cacheEntryIndex);
+            
+            if (!cacheEntryExists) // Deleted
+            {
+                deletedEntries.Add(storeEntryIndex);
+            }
+        }
+        await RemoveEntriesFromStore(helper, deletedEntries);
+
+
+        List<(int Index, KeyValuePair<string, Dictionary<string, float[]>> Entry)> createdEntries = [];
+        List<(int Index, int NewIndex)> changedEntries = [];
+        List<(int Index, string Model, string Key, float[] Embedding)> AddedModels = [];
+        List<(int Index, string Model)> RemovedModels = [];
+        foreach (KeyValuePair<int, KeyValuePair<string, Dictionary<string, float[]>>> kv in embeddingCacheIndexMap)
+        {
+            int cacheEntryIndex = kv.Key;
+            string cacheEntryString = kv.Value.Key;
+
+            bool storeEntryExists = embeddingStoreObjectMap.TryGetValue(cacheEntryString, out int storeEntryIndex);
+
+            if (!storeEntryExists) // Created
+            {
+                createdEntries.Add((
+                    Index: cacheEntryIndex,
+                    Entry: kv.Value
+                ));
+                continue;
+            }
+            if (cacheEntryIndex != storeEntryIndex) // Changed
+            {
+                changedEntries.Add((
+                    Index: cacheEntryIndex,
+                    NewIndex: storeEntryIndex
+                ));
+            }
+
+            // Check for new/removed models
+            var storeModels = embeddingStoreIndexMap[storeEntryIndex].Value;
+            var cacheModels = kv.Value.Value;
+            // New models
+            foreach (var model in storeModels.Keys.Except(cacheModels.Keys))
+            {
+                RemovedModels.Add((
+                    Index: cacheEntryIndex,
+                    Model: model
+                ));
+            }
+            // Removed models
+            foreach (var model in cacheModels.Keys.Except(storeModels.Keys))
+            {
+                AddedModels.Add((
+                    Index: cacheEntryIndex,
+                    Model: model,
+                    Key: cacheEntryString,
+                    Embedding: cacheModels[model]
+                ));
+            }
+        }
+
+        var taskSet = new List<Task>
+        {
+            CreateEntriesInStore(helper, createdEntries),
+            UpdateEntryIndicesInStore(helper, changedEntries),
+            AddModelsToIndices(helper, AddedModels),
+            RemoveModelsFromIndices(helper, RemovedModels)
+        };
+
+        await Task.WhenAll(taskSet);
+    }
+
+    private static async Task CreateEntriesInStore(
+        SQLiteHelper helper,
+        List<(int Index, KeyValuePair<string, Dictionary<string, float[]>> Entry)> createdEntries)
+    {
+        helper.BulkExecuteNonQuery(
+            "INSERT INTO embedding_cache (cache_key, model_key, embedding, idx) VALUES (@cache_key, @model_key, @embedding, @index)",
+            createdEntries.SelectMany(element => {
+                return element.Entry.Value.Select(model => new object[]
+                {
+                    new SqliteParameter("@cache_key", element.Entry.Key),
+                    new SqliteParameter("@model_key", model.Key),
+                    new SqliteParameter("@embedding", SearchdomainHelper.BytesFromFloatArray(model.Value)),
+                    new SqliteParameter("@index", element.Index)
+                });
+            })
+        );
+    }
+
+    private static async Task UpdateEntryIndicesInStore(
+        SQLiteHelper helper,
+        List<(int Index, int NewIndex)> changedEntries)
+    {
+        helper.BulkExecuteNonQuery(
+            "UPDATE embedding_cache SET idx = @newIndex WHERE idx = @index",
+            changedEntries.Select(element => new object[]
+            {
+                new SqliteParameter("@index", element.Index),
+                new SqliteParameter("@newIndex", -element.NewIndex) // The "-" prevents in-place update collisions
+            })
+        );
+        helper.BulkExecuteNonQuery(
+            "UPDATE embedding_cache SET idx = @newIndex WHERE idx = @index",
+            changedEntries.Select(element => new object[]
+            {
+                new SqliteParameter("@index", -element.NewIndex),
+                new SqliteParameter("@newIndex", element.NewIndex) // Flip the negative prefix
+            })
+        );
+    }
+
+    private static async Task RemoveEntriesFromStore(
+        SQLiteHelper helper,
+        List<int> deletedEntries)
+    {
+        helper.BulkExecuteNonQuery(
+            "DELETE FROM embedding_cache WHERE idx = @index",
+            deletedEntries.Select(index => new object[]
+            {
+                new SqliteParameter("@index", index)
+            })
+        );
+    }
+
+    private static async Task AddModelsToIndices(
+        SQLiteHelper helper,
+        List<(int Index, string Model, string Key, float[] Embedding)> addedModels)
+    {
+        helper.BulkExecuteNonQuery(
+            "INSERT INTO embedding_cache (cache_key, model_key, embedding, idx) VALUES (@cache_key, @model_key, @embedding, @index)",
+            addedModels.Select(element => new object[]
+            {
+                new SqliteParameter("@cache_key", element.Key),
+                new SqliteParameter("@model_key", element.Model),
+                new SqliteParameter("@embedding", SearchdomainHelper.BytesFromFloatArray(element.Embedding)),
+                new SqliteParameter("@index", element.Index)
+            })
+        );
+    }
+
+    private static async Task RemoveModelsFromIndices(
+        SQLiteHelper helper,
+        List<(int Index, string Model)> removedModels)
+    {
+        helper.BulkExecuteNonQuery(
+            "DELETE FROM embedding_cache WHERE idx = @index AND model_key = @model",
+            removedModels.Select(element => new object[]
+            {
+                new SqliteParameter("@index", element.Index),
+                new SqliteParameter("@model", element.Model)
+            })
+        );
+    }
+
+
+    private static (Dictionary<int, KeyValuePair<string, Dictionary<string, float[]>>> positionToEntry,
+        Dictionary<string, int> entryToPosition)
+    GetCacheMappings(EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache)
+    {
+        var positionToEntry = new Dictionary<int, KeyValuePair<string, Dictionary<string, float[]>>>();
+        var entryToPosition = new Dictionary<string, int>();
+        
+        int position = 0;
+        
+        foreach (var entry in embeddingCache)
+        {
+            positionToEntry[position] = entry;
+            entryToPosition[entry.Key] = position;
+            position++;
+        }
+        
+        return (positionToEntry, entryToPosition);
+    }
+}

src/Server/Helper/DatabaseHelper.cs

@@ -1,6 +1,6 @@
-using System.Configuration;
 using System.Data.Common;
 using System.Text;
+using System.Text.Json;
 using MySql.Data.MySqlClient;
 using Server.Exceptions;
 using Server.Models;
@@ -20,11 +20,13 @@ public class DatabaseHelper(ILogger<DatabaseHelper> logger)
         return new SQLHelper(connection, connectionString);
     }
 
-    public static void DatabaseInsertEmbeddingBulk(SQLHelper helper, int id_datapoint, List<(string model, byte[] embedding)> data)
+    public static async Task DatabaseInsertEmbeddingBulk(SQLHelper helper, int id_datapoint, List<(string model, byte[] embedding)> data, int id_entity, int id_searchdomain)
     {
         Dictionary<string, object> parameters = [];
         parameters["id_datapoint"] = id_datapoint;
-        var query = new StringBuilder("INSERT INTO embedding (id_datapoint, model, embedding) VALUES ");
+        parameters["id_entity"] = id_entity;
+        parameters["id_searchdomain"] = id_searchdomain;
+        var query = new StringBuilder("INSERT INTO embedding (id_datapoint, model, embedding, id_embedding, id_searchdomain) VALUES ");
         foreach (var (model, embedding) in data)
         {
             string modelParam = $"model_{Guid.NewGuid()}".Replace("-", "");
@@ -32,24 +34,39 @@ public class DatabaseHelper(ILogger<DatabaseHelper> logger)
             parameters[modelParam] = model;
             parameters[embeddingParam] = embedding;
 
-            query.Append($"(@id_datapoint, @{modelParam}, @{embeddingParam}), ");
+            query.Append($"(@id_datapoint, @{modelParam}, @{embeddingParam}, @id_entity), ");
         }
 
         query.Length -= 2; // remove trailing comma
-        helper.ExecuteSQLNonQuery(query.ToString(), parameters);
+        await helper.ExecuteSQLNonQuery(query.ToString(), parameters);
     }
 
-    public static int DatabaseInsertSearchdomain(SQLHelper helper, string name, SearchdomainSettings settings = new())
+    public static async Task<int> DatabaseInsertEmbeddingBulk(SQLHelper helper, List<(int id_datapoint, string model, byte[] embedding)> data, int id_entity, int id_searchdomain)
+    {
+        return await helper.BulkExecuteNonQuery(
+            "INSERT INTO embedding (id_datapoint, model, embedding, id_entity, id_searchdomain) VALUES (@id_datapoint, @model, @embedding, @id_entity, @id_searchdomain);",
+            data.Select(element => new object[] {
+                new MySqlParameter("@model", element.model),
+                new MySqlParameter("@embedding", element.embedding),
+                new MySqlParameter("@id_datapoint", element.id_datapoint),
+                new MySqlParameter("@id_entity", id_entity),
+                new MySqlParameter("@id_searchdomain", id_searchdomain)
+            })
+        );
+    }
+
+
+    public static async Task<int> DatabaseInsertSearchdomain(SQLHelper helper, string name, SearchdomainSettings settings = new())
     {
         Dictionary<string, dynamic> parameters = new()
         {
             { "name", name },
             { "settings", settings}
         };
-        return helper.ExecuteSQLCommandGetInsertedID("INSERT INTO searchdomain (name, settings) VALUES (@name, @settings)", parameters);
+        return await helper.ExecuteSQLCommandGetInsertedID("INSERT INTO searchdomain (name, settings) VALUES (@name, @settings)", parameters);
     }
 
-    public static int DatabaseInsertEntity(SQLHelper helper, string name, ProbMethodEnum probmethod, int id_searchdomain)
+    public static async Task<int> DatabaseInsertEntity(SQLHelper helper, string name, ProbMethodEnum probmethod, int id_searchdomain)
     {
         Dictionary<string, dynamic> parameters = new()
         {
@@ -57,21 +74,59 @@ public class DatabaseHelper(ILogger<DatabaseHelper> logger)
             { "probmethod", probmethod.ToString() },
             { "id_searchdomain", id_searchdomain }
         };
-        return helper.ExecuteSQLCommandGetInsertedID("INSERT INTO entity (name, probmethod, id_searchdomain) VALUES (@name, @probmethod, @id_searchdomain)", parameters);
+        return await helper.ExecuteSQLCommandGetInsertedID("INSERT INTO entity (name, probmethod, id_searchdomain) VALUES (@name, @probmethod, @id_searchdomain);", parameters);
     }
 
-    public static int DatabaseInsertAttribute(SQLHelper helper, string attribute, string value, int id_entity)
+    public static async Task<int> DatabaseInsertAttributes(SQLHelper helper, List<(string attribute, string value, int id_entity)> values) //string[] attribute, string value, int id_entity)
     {
-        Dictionary<string, dynamic> parameters = new()
-        {
-            { "attribute", attribute },
-            { "value", value },
-            { "id_entity", id_entity }
-        };
-        return helper.ExecuteSQLCommandGetInsertedID("INSERT INTO attribute (attribute, value, id_entity) VALUES (@attribute, @value, @id_entity)", parameters);
+        return await helper.BulkExecuteNonQuery(
+            "INSERT INTO attribute (attribute, value, id_entity) VALUES (@attribute, @value, @id_entity);",
+            values.Select(element => new object[] {
+                new MySqlParameter("@attribute", element.attribute),
+                new MySqlParameter("@value", element.value),
+                new MySqlParameter("@id_entity", element.id_entity)
+            })
+        );
     }
 
-    public static int DatabaseInsertDatapoint(SQLHelper helper, string name, ProbMethodEnum probmethod_embedding, SimilarityMethodEnum similarityMethod, string hash, int id_entity)
+    public static async Task<int> DatabaseUpdateAttributes(SQLHelper helper, List<(string attribute, string value, int id_entity)> values)
+    {
+        return await helper.BulkExecuteNonQuery(
+            "UPDATE attribute SET value=@value WHERE id_entity=@id_entity AND attribute=@attribute",
+            values.Select(element => new object[] {
+                new MySqlParameter("@attribute", element.attribute),
+                new MySqlParameter("@value", element.value),
+                new MySqlParameter("@id_entity", element.id_entity)
+            })
+        );
+    }
+
+    public static async Task<int> DatabaseDeleteAttributes(SQLHelper helper, List<(string attribute, int id_entity)> values)
+    {
+        return await helper.BulkExecuteNonQuery(
+            "DELETE FROM attribute WHERE id_entity=@id_entity AND attribute=@attribute",
+            values.Select(element => new object[] {
+                new MySqlParameter("@attribute", element.attribute),
+                new MySqlParameter("@id_entity", element.id_entity)
+            })
+        );
+    }
+
+    public static async Task<int> DatabaseInsertDatapoints(SQLHelper helper, List<(string name, ProbMethodEnum probmethod_embedding, SimilarityMethodEnum similarityMethod, string hash)> values, int id_entity)
+    {
+        return await helper.BulkExecuteNonQuery(
+            "INSERT INTO datapoint (name, probmethod_embedding, similaritymethod, hash, id_entity) VALUES (@name, @probmethod_embedding, @similaritymethod, @hash, @id_entity);",
+            values.Select(element => new object[] {
+                new MySqlParameter("@name", element.name),
+                new MySqlParameter("@probmethod_embedding", element.probmethod_embedding),
+                new MySqlParameter("@similaritymethod", element.similarityMethod),
+                new MySqlParameter("@hash", element.hash),
+                new MySqlParameter("@id_entity", id_entity)
+            })
+        );
+    }
+
+    public static async Task<int> DatabaseInsertDatapoint(SQLHelper helper, string name, ProbMethodEnum probmethod_embedding, SimilarityMethodEnum similarityMethod, string hash, int id_entity)
     {
         Dictionary<string, dynamic> parameters = new()
         {
@@ -81,111 +136,155 @@ public class DatabaseHelper(ILogger<DatabaseHelper> logger)
             { "hash", hash },
             { "id_entity", id_entity }
         };
-        return helper.ExecuteSQLCommandGetInsertedID("INSERT INTO datapoint (name, probmethod_embedding, similaritymethod, hash, id_entity) VALUES (@name, @probmethod_embedding, @similaritymethod, @hash, @id_entity)", parameters);
+        return await helper.ExecuteSQLCommandGetInsertedID("INSERT INTO datapoint (name, probmethod_embedding, similaritymethod, hash, id_entity) VALUES (@name, @probmethod_embedding, @similaritymethod, @hash, @id_entity)", parameters);
     }
 
-    public static int DatabaseInsertEmbedding(SQLHelper helper, int id_datapoint, string model, byte[] embedding)
+    public static async Task<(int datapoints, int embeddings)> DatabaseDeleteEmbeddingsAndDatapoints(SQLHelper helper, List<string> values, int id_entity)
+    {
+        int embeddings = await helper.BulkExecuteNonQuery(
+            "DELETE e FROM embedding e WHERE id_entity = @entityId",
+            values.Select(element => new object[] {
+                new MySqlParameter("@datapointName", element),
+                new MySqlParameter("@entityId", id_entity)
+            })
+        );
+        int datapoints = await helper.BulkExecuteNonQuery(
+            "DELETE FROM datapoint WHERE name=@datapointName AND id_entity=@entityId",
+            values.Select(element => new object[] {
+                new MySqlParameter("@datapointName", element),
+                new MySqlParameter("@entityId", id_entity)
+            })
+        );
+        return (datapoints: datapoints, embeddings: embeddings);
+    }
+
+    public static async Task<int> DatabaseUpdateDatapoint(SQLHelper helper, List<(string name, string probmethod_embedding, string similarityMethod)> values, int id_entity)
+    {
+        return await helper.BulkExecuteNonQuery(
+            "UPDATE datapoint SET probmethod_embedding=@probmethod, similaritymethod=@similaritymethod WHERE id_entity=@entityId AND name=@datapointName",
+            values.Select(element => new object[] {
+                new MySqlParameter("@probmethod", element.probmethod_embedding),
+                new MySqlParameter("@similaritymethod", element.similarityMethod),
+                new MySqlParameter("@entityId", id_entity),
+                new MySqlParameter("@datapointName", element.name)
+            })
+        );
+    }
+
+    public static async Task<int> DatabaseInsertEmbedding(SQLHelper helper, int id_datapoint, string model, byte[] embedding, int id_entity, int id_searchdomain)
     {
         Dictionary<string, dynamic> parameters = new()
         {
             { "id_datapoint", id_datapoint },
             { "model", model },
-            { "embedding", embedding }
+            { "embedding", embedding },
+            { "id_entity", id_entity },
+            { "id_searchdomain", id_searchdomain }
         };
-        return helper.ExecuteSQLCommandGetInsertedID("INSERT INTO embedding (id_datapoint, model, embedding) VALUES (@id_datapoint, @model, @embedding)", parameters);
+        return await helper.ExecuteSQLCommandGetInsertedID("INSERT INTO embedding (id_datapoint, model, embedding, id_entity, id_searchdomain) VALUES (@id_datapoint, @model, @embedding, @id_entity, @id_searchdomain)", parameters);
     }
 
-    public int GetSearchdomainID(SQLHelper helper, string searchdomain)
+    public async Task<int> GetSearchdomainID(SQLHelper helper, string searchdomain)
     {
-        Dictionary<string, dynamic> parameters = new()
+        Dictionary<string, object?> parameters = new()
         {
             { "searchdomain", searchdomain}
         };
-        lock (helper.connection)
-        {
-            DbDataReader reader = helper.ExecuteSQLCommand("SELECT id FROM searchdomain WHERE name = @searchdomain", parameters);
-            bool success = reader.Read();
-            int result = success ? reader.GetInt32(0) : 0;
-            reader.Close();
-            if (success)
-            {
-                return result;
-            }
-            else
-            {
-                _logger.LogError("Unable to retrieve searchdomain ID for {searchdomain}", [searchdomain]);
-                throw new SearchdomainNotFoundException(searchdomain);
-            }
-        }
+        return (await helper.ExecuteQueryAsync("SELECT id FROM searchdomain WHERE name = @searchdomain", parameters, x => x.GetInt32(0))).First();
     }
 
-    public void RemoveEntity(List<Entity> entityCache, SQLHelper helper, string name, string searchdomain)
+    public async Task RemoveEntity(List<Entity> entityCache, SQLHelper helper, string name, string searchdomain)
     {
         Dictionary<string, dynamic> parameters = new()
         {
             { "name", name },
-            { "searchdomain", GetSearchdomainID(helper, searchdomain)}
+            { "searchdomain", await GetSearchdomainID(helper, searchdomain)}
         };
 
-        helper.ExecuteSQLNonQuery("DELETE embedding.* FROM embedding JOIN datapoint dp ON id_datapoint = dp.id JOIN entity ON id_entity = entity.id WHERE entity.name = @name AND entity.id_searchdomain = @searchdomain", parameters);
-        helper.ExecuteSQLNonQuery("DELETE datapoint.* FROM datapoint JOIN entity ON id_entity = entity.id WHERE entity.name = @name AND entity.id_searchdomain = @searchdomain", parameters);
-        helper.ExecuteSQLNonQuery("DELETE attribute.* FROM attribute JOIN entity ON id_entity = entity.id WHERE entity.name = @name AND entity.id_searchdomain = @searchdomain", parameters);
-        helper.ExecuteSQLNonQuery("DELETE FROM entity WHERE name = @name AND entity.id_searchdomain = @searchdomain", parameters);
-        entityCache.RemoveAll(entity => entity.name == name);
+        await helper.ExecuteSQLNonQuery("DELETE embedding.* FROM embedding JOIN entity ON id_entity = entity.id WHERE entity.name = @name AND entity.id_searchdomain = @searchdomain", parameters);
+        await helper.ExecuteSQLNonQuery("DELETE datapoint.* FROM datapoint JOIN entity ON id_entity = entity.id WHERE entity.name = @name AND entity.id_searchdomain = @searchdomain", parameters);
+        await helper.ExecuteSQLNonQuery("DELETE attribute.* FROM attribute JOIN entity ON id_entity = entity.id WHERE entity.name = @name AND entity.id_searchdomain = @searchdomain", parameters);
+        await helper.ExecuteSQLNonQuery("DELETE FROM entity WHERE name = @name AND entity.id_searchdomain = @searchdomain", parameters);
+        entityCache.RemoveAll(entity => entity.Name == name);
     }
 
-    public int RemoveAllEntities(SQLHelper helper, string searchdomain)
+    public async Task<int> RemoveAllEntities(SQLHelper helper, string searchdomain)
     {
         Dictionary<string, dynamic> parameters = new()
         {
-            { "searchdomain", GetSearchdomainID(helper, searchdomain)}
+            { "searchdomain", await GetSearchdomainID(helper, searchdomain)}
         };
-
-        helper.ExecuteSQLNonQuery("DELETE embedding.* FROM embedding JOIN datapoint dp ON id_datapoint = dp.id JOIN entity ON id_entity = entity.id WHERE entity.id_searchdomain = @searchdomain", parameters);
-        helper.ExecuteSQLNonQuery("DELETE datapoint.* FROM datapoint JOIN entity ON id_entity = entity.id WHERE entity.id_searchdomain = @searchdomain", parameters);
-        helper.ExecuteSQLNonQuery("DELETE attribute.* FROM attribute JOIN entity ON id_entity = entity.id WHERE entity.id_searchdomain = @searchdomain", parameters);
-        return helper.ExecuteSQLNonQuery("DELETE FROM entity WHERE entity.id_searchdomain = @searchdomain", parameters);
+        int count;
+        do
+        {
+            count = await helper.ExecuteSQLNonQuery("DELETE FROM embedding WHERE id_searchdomain = @searchdomain LIMIT 10000", parameters);
+        } while (count == 10000);
+        do
+        {
+            count = await helper.ExecuteSQLNonQuery("DELETE FROM datapoint WHERE id_entity IN (SELECT id FROM entity WHERE id_searchdomain = @searchdomain) LIMIT 10000", parameters);
+        } while (count == 10000);
+        do
+        {
+            count = await helper.ExecuteSQLNonQuery("DELETE FROM attribute WHERE id_entity IN (SELECT id FROM entity WHERE id_searchdomain = @searchdomain) LIMIT 10000", parameters);
+        } while (count == 10000);
+        int total = 0;
+        do
+        {
+            count = await helper.ExecuteSQLNonQuery("DELETE FROM entity WHERE id_searchdomain = @searchdomain LIMIT 10000", parameters);
+            total += count;
+        } while (count == 10000);
+        return total;
     }
 
-    public bool HasEntity(SQLHelper helper, string name, string searchdomain)
+    public async Task<bool> HasEntity(SQLHelper helper, string name, string searchdomain)
     {
         Dictionary<string, dynamic> parameters = new()
         {
             { "name", name },
-            { "searchdomain", GetSearchdomainID(helper, searchdomain)}
+            { "searchdomain", await GetSearchdomainID(helper, searchdomain)}
         };
-        lock (helper.connection)
+        lock (helper.Connection)
         {
             DbDataReader reader = helper.ExecuteSQLCommand("SELECT COUNT(*) FROM entity WHERE name = @name AND id_searchdomain = @searchdomain", parameters);
-            bool success = reader.Read();
-            bool result = success && reader.GetInt32(0) > 0;
-            reader.Close();
-            if (success)
+            try
             {
-                return result;
-            }
-            else
+                bool success = reader.Read();
+                bool result = success && reader.GetInt32(0) > 0;
+                if (success)
+                {
+                    return result;
+                }
+                else
+                {
+                    _logger.LogError("Unable to determine whether an entity named {name} exists for {searchdomain}", [name, searchdomain]);
+                    throw new Exception($"Unable to determine whether an entity named {name} exists for {searchdomain}");
+                }                
+            } finally
             {
-                _logger.LogError("Unable to determine whether an entity named {name} exists for {searchdomain}", [name, searchdomain]);
-                throw new Exception($"Unable to determine whether an entity named {name} exists for {searchdomain}");
+                reader.Close();
             }
         }
     }
 
-    public int? GetEntityID(SQLHelper helper, string name, string searchdomain)
+    public async Task<int?> GetEntityID(SQLHelper helper, string name, string searchdomain)
     {
         Dictionary<string, dynamic> parameters = new()
         {
             { "name", name },
-            { "searchdomain", GetSearchdomainID(helper, searchdomain)}
+            { "searchdomain", await GetSearchdomainID(helper, searchdomain)}
         };
-        lock (helper.connection)
+        lock (helper.Connection)
         {
             DbDataReader reader = helper.ExecuteSQLCommand("SELECT id FROM entity WHERE name = @name AND id_searchdomain = @searchdomain", parameters);
-            bool success = reader.Read();
-            int? result = success ? reader.GetInt32(0) : 0;
-            reader.Close();
-            return result;
+            try
+            {
+                bool success = reader.Read();
+                int? result = success ? reader.GetInt32(0) : 0;
+                return result;
+            } finally
+            {
+                reader.Close();
+            }
         }
     }
 
@@ -196,40 +295,87 @@ public class DatabaseHelper(ILogger<DatabaseHelper> logger)
             { "searchdomain", searchdomain}
         };
         DbDataReader searchdomainSumReader = helper.ExecuteSQLCommand("SELECT SUM(LENGTH(id) + LENGTH(name) + LENGTH(settings)) AS total_bytes FROM embeddingsearch.searchdomain WHERE name=@searchdomain", parameters);
-        bool success = searchdomainSumReader.Read();
-        long result = success && !searchdomainSumReader.IsDBNull(0) ? searchdomainSumReader.GetInt64(0) : 0;
-        searchdomainSumReader.Close();
+        bool success;
+        long result;
+        try
+        {
+            success = searchdomainSumReader.Read();
+            result = success && !searchdomainSumReader.IsDBNull(0) ? searchdomainSumReader.GetInt64(0) : 0;
+        } finally
+        {
+            searchdomainSumReader.Close();
+        }
 
         DbDataReader entitySumReader = helper.ExecuteSQLCommand("SELECT SUM(LENGTH(e.id) + LENGTH(e.name) + LENGTH(e.probmethod) + LENGTH(e.id_searchdomain)) AS total_bytes FROM embeddingsearch.entity e JOIN embeddingsearch.searchdomain s ON e.id_searchdomain = s.id WHERE s.name=@searchdomain", parameters);
-        success = entitySumReader.Read();
-        result += success && !entitySumReader.IsDBNull(0) ? entitySumReader.GetInt64(0) : 0;
-        entitySumReader.Close();
+        try
+        {
+            success = entitySumReader.Read();
+            result += success && !entitySumReader.IsDBNull(0) ? entitySumReader.GetInt64(0) : 0;
+        } finally
+        {
+            entitySumReader.Close();
+        }
 
         DbDataReader datapointSumReader = helper.ExecuteSQLCommand("SELECT SUM(LENGTH(d.id) + LENGTH(d.name) + LENGTH(d.probmethod_embedding) + LENGTH(d.similaritymethod) + LENGTH(d.id_entity) + LENGTH(d.hash)) AS total_bytes FROM embeddingsearch.datapoint d JOIN embeddingsearch.entity e ON d.id_entity = e.id JOIN embeddingsearch.searchdomain s ON e.id_searchdomain = s.id WHERE s.name=@searchdomain", parameters);
-        success = datapointSumReader.Read();
-        result += success && !datapointSumReader.IsDBNull(0) ? datapointSumReader.GetInt64(0) : 0;
-        datapointSumReader.Close();
+        try
+        {
+            success = datapointSumReader.Read();
+            result += success && !datapointSumReader.IsDBNull(0) ? datapointSumReader.GetInt64(0) : 0;
+        } finally
+        {
+            datapointSumReader.Close();
+        }
 
         DbDataReader embeddingSumReader = helper.ExecuteSQLCommand("SELECT SUM(LENGTH(em.id) + LENGTH(em.id_datapoint) + LENGTH(em.model) + LENGTH(em.embedding)) AS total_bytes FROM embeddingsearch.embedding em JOIN embeddingsearch.datapoint d ON em.id_datapoint = d.id JOIN embeddingsearch.entity e ON d.id_entity = e.id JOIN embeddingsearch.searchdomain s ON e.id_searchdomain = s.id WHERE s.name=@searchdomain", parameters);
-        success = embeddingSumReader.Read();
-        result += success && !embeddingSumReader.IsDBNull(0) ? embeddingSumReader.GetInt64(0) : 0;
-        embeddingSumReader.Close();
+        try
+        {
+            success = embeddingSumReader.Read();
+            result += success && !embeddingSumReader.IsDBNull(0) ? embeddingSumReader.GetInt64(0) : 0;
+        } finally
+        {
+            embeddingSumReader.Close();
+        }
 
         DbDataReader attributeSumReader = helper.ExecuteSQLCommand("SELECT SUM(LENGTH(a.id) + LENGTH(a.id_entity) + LENGTH(a.attribute) + LENGTH(a.value)) AS total_bytes FROM embeddingsearch.attribute a JOIN embeddingsearch.entity e ON a.id_entity = e.id JOIN embeddingsearch.searchdomain s ON e.id_searchdomain = s.id WHERE s.name=@searchdomain", parameters);
-        success = attributeSumReader.Read();
-        result += success && !attributeSumReader.IsDBNull(0) ? attributeSumReader.GetInt64(0) : 0;
-        attributeSumReader.Close();
+        try
+        {
+            success = attributeSumReader.Read();
+            result += success && !attributeSumReader.IsDBNull(0) ? attributeSumReader.GetInt64(0) : 0;
+        } finally
+        {
+            attributeSumReader.Close();
+        }
 
         return result;
     }
 
+    public static long GetTotalDatabaseSize(SQLHelper helper)
+    {
+        Dictionary<string, dynamic> parameters = [];
+        DbDataReader searchdomainSumReader = helper.ExecuteSQLCommand("SELECT SUM(Data_length) FROM information_schema.tables", parameters);
+        try
+        {
+            bool success = searchdomainSumReader.Read();
+            long result = success && !searchdomainSumReader.IsDBNull(0) ? searchdomainSumReader.GetInt64(0) : 0;
+            return result;
+        } finally
+        {
+            searchdomainSumReader.Close();
+        }
+    }
+
     public static async Task<long> CountEntities(SQLHelper helper)
     {
         DbDataReader searchdomainSumReader = helper.ExecuteSQLCommand("SELECT COUNT(*) FROM entity;", []);
-        bool success = searchdomainSumReader.Read();
-        long result = success && !searchdomainSumReader.IsDBNull(0) ? searchdomainSumReader.GetInt64(0) : 0;
-        searchdomainSumReader.Close();
-        return result;
+        try
+        {
+            bool success = searchdomainSumReader.Read();
+            long result = success && !searchdomainSumReader.IsDBNull(0) ? searchdomainSumReader.GetInt64(0) : 0;
+            return result;
+        } finally
+        {
+            searchdomainSumReader.Close();
+        }
     }
 
     public static long CountEntitiesForSearchdomain(SQLHelper helper, string searchdomain)
@@ -239,9 +385,32 @@ public class DatabaseHelper(ILogger<DatabaseHelper> logger)
             { "searchdomain", searchdomain}
         };
         DbDataReader searchdomainSumReader = helper.ExecuteSQLCommand("SELECT COUNT(*) FROM entity e JOIN searchdomain s on e.id_searchdomain = s.id WHERE e.id_searchdomain = s.id AND s.name = @searchdomain;", parameters);
-        bool success = searchdomainSumReader.Read();
-        long result = success && !searchdomainSumReader.IsDBNull(0) ? searchdomainSumReader.GetInt64(0) : 0;
-        searchdomainSumReader.Close();
-        return result;
+        try
+        {
+            bool success = searchdomainSumReader.Read();
+            long result = success && !searchdomainSumReader.IsDBNull(0) ? searchdomainSumReader.GetInt64(0) : 0;
+            return result;
+        } finally
+        {
+            searchdomainSumReader.Close();
+        }
+    }
+
+    public static SearchdomainSettings GetSearchdomainSettings(SQLHelper helper, string searchdomain)
+    {
+        Dictionary<string, dynamic> parameters = new()
+        {
+            ["name"] = searchdomain
+        };
+        DbDataReader reader = helper.ExecuteSQLCommand("SELECT settings from searchdomain WHERE name = @name", parameters);
+        try
+        {
+            reader.Read();
+            string settingsString = reader.GetString(0);
+            return JsonSerializer.Deserialize<SearchdomainSettings>(settingsString);
+        } finally
+        {
+            reader.Close();
+        }
     }
 }

src/Server/Helper/SQLHelper.cs

@@ -1,3 +1,4 @@
+using System.Data;
 using System.Data.Common;
 using MySql.Data.MySqlClient;
 
@@ -5,46 +6,86 @@ namespace Server.Helper;
 
 public class SQLHelper:IDisposable
 {
-    public MySqlConnection connection;
-    public string connectionString;
+    public MySqlConnection Connection;
+    public DbDataReader? DbDataReader;
+    public MySqlConnectionPoolElement[] ConnectionPool;
+    public string ConnectionString;
     public SQLHelper(MySqlConnection connection, string connectionString)
     {
-        this.connection = connection;
-        this.connectionString = connectionString;
+        Connection = connection;
+        ConnectionString = connectionString;
+        ConnectionPool = new MySqlConnectionPoolElement[50];
+        for (int i = 0; i < ConnectionPool.Length; i++)
+        {
+            ConnectionPool[i] = new MySqlConnectionPoolElement(new MySqlConnection(connectionString), new(1, 1));
+        }
     }
 
-    public SQLHelper DuplicateConnection()
+    public SQLHelper DuplicateConnection() // TODO remove this
     {
-        MySqlConnection newConnection = new(connectionString);
-        return new SQLHelper(newConnection, connectionString);
+        return this;
     }
 
     public void Dispose()
     {
-        connection.Close();
+        Connection.Close();
         GC.SuppressFinalize(this);
     }
 
     public DbDataReader ExecuteSQLCommand(string query, Dictionary<string, dynamic> parameters)
     {
-        lock (connection)
+        lock (Connection)
         {
             EnsureConnected();
-            using MySqlCommand command = connection.CreateCommand();
+            EnsureDbReaderIsClosed();
+            using MySqlCommand command = Connection.CreateCommand();
             command.CommandText = query;
             foreach (KeyValuePair<string, dynamic> parameter in parameters)
             {
                 command.Parameters.AddWithValue($"@{parameter.Key}", parameter.Value);
             }
-            return command.ExecuteReader();
+            DbDataReader = command.ExecuteReader();
+            return DbDataReader;
         }
     }
 
-    public int ExecuteSQLNonQuery(string query, Dictionary<string, dynamic> parameters)
+    public async Task<List<T>> ExecuteQueryAsync<T>(
+        string sql,
+        Dictionary<string, object?> parameters,
+        Func<DbDataReader, T> map)
     {
-        lock (connection)
+        var poolElement = await GetMySqlConnectionPoolElement();
+        var connection = poolElement.Connection;
+        try
+        {
+            await using var command = connection.CreateCommand();
+            command.CommandText = sql;
+
+            foreach (var p in parameters)
+                command.Parameters.AddWithValue($"@{p.Key}", p.Value);
+
+            await using var reader = await command.ExecuteReaderAsync();
+
+            var result = new List<T>();
+            while (await reader.ReadAsync())
+            {
+                result.Add(map(reader));
+            }
+
+            return result;
+        } finally
+        {
+
+            poolElement.Semaphore.Release();
+        }
+    }
+
+    public async Task<int> ExecuteSQLNonQuery(string query, Dictionary<string, dynamic> parameters)
+    {
+        var poolElement = await GetMySqlConnectionPoolElement();
+        var connection = poolElement.Connection;
+        try
         {
-            EnsureConnected();
             using MySqlCommand command = connection.CreateCommand();
 
             command.CommandText = query;
@@ -53,14 +94,18 @@ public class SQLHelper:IDisposable
                 command.Parameters.AddWithValue($"@{parameter.Key}", parameter.Value);
             }
             return command.ExecuteNonQuery();
+        } finally
+        {
+            poolElement.Semaphore.Release();
         }
     }
 
-    public int ExecuteSQLCommandGetInsertedID(string query, Dictionary<string, dynamic> parameters)
+    public async Task<int> ExecuteSQLCommandGetInsertedID(string query, Dictionary<string, dynamic> parameters)
     {
-        lock (connection)
+        var poolElement = await GetMySqlConnectionPoolElement();
+        var connection = poolElement.Connection;
+        try
         {
-            EnsureConnected();
             using MySqlCommand command = connection.CreateCommand();
 
             command.CommandText = query;
@@ -71,23 +116,126 @@ public class SQLHelper:IDisposable
             command.ExecuteNonQuery();
             command.CommandText = "SELECT LAST_INSERT_ID();";
             return Convert.ToInt32(command.ExecuteScalar());
+        } finally
+        {
+            poolElement.Semaphore.Release();
         }
     }
 
+    public async Task<int> BulkExecuteNonQuery(string sql, IEnumerable<object[]> parameterSets)
+    {
+        var poolElement = await GetMySqlConnectionPoolElement();
+        var connection = poolElement.Connection;
+        try
+        {
+            int affectedRows = 0;
+            int retries = 0;
+            
+            while (retries <= 3)
+            {
+                try
+                {
+                    using var transaction = connection.BeginTransaction();
+                    using var command = connection.CreateCommand();
+
+                    command.CommandText = sql;
+                    command.Transaction = transaction;
+
+                    foreach (var parameters in parameterSets)
+                    {
+                        command.Parameters.Clear();
+                        command.Parameters.AddRange(parameters);
+                        affectedRows += command.ExecuteNonQuery();
+                    }
+                    
+                    transaction.Commit();
+                    break;
+                }
+                catch (Exception)
+                {
+                    retries++;
+                    if (retries > 3)
+                        throw;
+                    Thread.Sleep(10);
+                }
+            }
+            
+            return affectedRows;
+        } finally
+        {
+            poolElement.Semaphore.Release();
+        }
+    }
+
+    public async Task<MySqlConnectionPoolElement> GetMySqlConnectionPoolElement()
+    {
+        int counter = 0;
+        int sleepTime = 10;
+        do
+        {
+            foreach (var element in ConnectionPool)
+            {
+                if (element.Semaphore.Wait(0))
+                {
+                    if (element.Connection.State == ConnectionState.Closed)
+                    {
+                        await element.Connection.CloseAsync();
+                        await element.Connection.OpenAsync();
+                    }
+                    return element;
+                }
+            }
+            Thread.Sleep(sleepTime);
+        } while (++counter <= 50);
+        TimeoutException ex = new("Unable to get MySqlConnection");
+        ElmahCore.ElmahExtensions.RaiseError(ex);
+        throw ex;
+    }
+
     public bool EnsureConnected()
     {
-        if (connection.State != System.Data.ConnectionState.Open)
+        if (Connection.State != System.Data.ConnectionState.Open)
         {
             try
             {
-                connection.Close();
-                connection.Open();
+                Connection.Close();
+                Connection.Open();
             }
-            catch (Exception)
+            catch (Exception ex)
             {
-                throw; // TODO add logging here
+                ElmahCore.ElmahExtensions.RaiseError(ex);
+                throw;
             }
         }
         return true;
     }
+
+    public void EnsureDbReaderIsClosed()
+    {
+        int counter = 0;
+        int sleepTime = 10;
+        int timeout = 5000;
+        while (!(DbDataReader?.IsClosed ?? true))
+        {
+            if (counter > timeout / sleepTime)
+            {
+                TimeoutException ex = new("Unable to ensure dbDataReader is closed");
+                ElmahCore.ElmahExtensions.RaiseError(ex);
+                throw ex;
+            }
+            Thread.Sleep(sleepTime);
+        }
+    }
+}
+
+public struct MySqlConnectionPoolElement
+{
+    public MySqlConnection Connection;
+    public SemaphoreSlim Semaphore;
+
+    public MySqlConnectionPoolElement(MySqlConnection connection, SemaphoreSlim semaphore)
+    {
+        Connection = connection;
+        Semaphore = semaphore;
+    }
 }

src/Server/Helper/SQLiteHelper.cs

@@ -0,0 +1,76 @@
+using System.Data;
+using System.Data.Common;
+using Microsoft.Data.Sqlite;
+using Server.Models;
+using MySql.Data.MySqlClient;
+using System.Configuration;
+
+namespace Server.Helper;
+
+public class SQLiteHelper : SqlHelper, IDisposable
+{
+    public SQLiteHelper(DbConnection connection, string connectionString) : base(connection, connectionString)
+    {
+        Connection = connection;
+        ConnectionString = connectionString;
+    }
+
+    public SQLiteHelper(EmbeddingSearchOptions options) : base(new SqliteConnection(options.ConnectionStrings.Cache), options.ConnectionStrings.Cache ?? "")
+    {
+        if (options.ConnectionStrings.Cache is null)
+        {
+            throw new ConfigurationErrorsException("Cache options must not be null when instantiating SQLiteHelper");
+        }
+        ConnectionString = options.ConnectionStrings.Cache;
+        Connection = new SqliteConnection(ConnectionString);
+    }
+
+    public override SQLiteHelper DuplicateConnection()
+    {
+        SqliteConnection newConnection = new(ConnectionString);
+        return new SQLiteHelper(newConnection, ConnectionString);
+    }
+
+    public override int ExecuteSQLCommandGetInsertedID(string query, object[] parameters)
+    {
+        lock (Connection)
+        {
+            EnsureConnected();
+            EnsureDbReaderIsClosed();
+            using DbCommand command = Connection.CreateCommand();
+
+            command.CommandText = query;
+            command.Parameters.AddRange(parameters);
+            command.ExecuteNonQuery();
+            command.CommandText = "SELECT last_insert_rowid();";
+            return Convert.ToInt32(command.ExecuteScalar());
+        }
+    }
+
+    public int BulkExecuteNonQuery(string sql, IEnumerable<object[]> parameterSets)
+    {
+        lock (Connection)
+        {
+            EnsureConnected();
+            EnsureDbReaderIsClosed();
+
+            using var transaction = Connection.BeginTransaction();
+            using var command = Connection.CreateCommand();
+
+            command.CommandText = sql;
+            command.Transaction = transaction;
+
+            int affectedRows = 0;
+
+            foreach (var parameters in parameterSets)
+            {
+                command.Parameters.Clear();
+                command.Parameters.AddRange(parameters);
+                affectedRows += command.ExecuteNonQuery();
+            }
+
+            transaction.Commit();
+            return affectedRows;
+        }
+    }
+}

src/Server/Helper/SearchdomainHelper.cs

@@ -1,9 +1,11 @@
 using System.Collections.Concurrent;
+using System.Diagnostics;
 using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
 using AdaptiveExpressions;
 using Server.Exceptions;
+using Shared;
 using Shared.Models;
 
 namespace Server.Helper;
@@ -15,7 +17,7 @@ public class SearchdomainHelper(ILogger<SearchdomainHelper> logger, DatabaseHelp
 
     public static byte[] BytesFromFloatArray(float[] floats)
     {
-        var byteArray = new byte[floats.Length * 4];
+        var byteArray = new byte[floats.Length * sizeof(float)];
         var floatArray = floats.ToArray();
         Buffer.BlockCopy(floatArray, 0, byteArray, 0, byteArray.Length);
         return byteArray;
@@ -23,21 +25,21 @@ public class SearchdomainHelper(ILogger<SearchdomainHelper> logger, DatabaseHelp
 
     public static float[] FloatArrayFromBytes(byte[] bytes)
     {
-        var floatArray = new float[bytes.Length / 4];
+        var floatArray = new float[bytes.Length / sizeof(float)];
         Buffer.BlockCopy(bytes, 0, floatArray, 0, bytes.Length);
         return floatArray;
     }
 
-    public static bool CacheHasEntity(List<Entity> entityCache, string name)
+    public static bool CacheHasEntity(ConcurrentDictionary<string, Entity> entityCache, string name)
     {
         return CacheGetEntity(entityCache, name) is not null;
     }
 
-    public static Entity? CacheGetEntity(List<Entity> entityCache, string name)
+    public static Entity? CacheGetEntity(ConcurrentDictionary<string, Entity> entityCache, string name)
     {
-        foreach (Entity entity in entityCache)
+        foreach ((string _, Entity entity) in entityCache)
         {
-            if (entity.name == name)
+            if (entity.Name == name)
             {
                 return entity;
             }
@@ -45,11 +47,11 @@ public class SearchdomainHelper(ILogger<SearchdomainHelper> logger, DatabaseHelp
         return null;
     }
 
-    public List<Entity>? EntitiesFromJSON(SearchdomainManager searchdomainManager, ILogger logger, string json)
+    public async Task<List<Entity>?> EntitiesFromJSON(SearchdomainManager searchdomainManager, ILogger logger, string json)
     {
-        LRUCache<string, Dictionary<string, float[]>> embeddingCache = searchdomainManager.embeddingCache;
-        AIProvider aIProvider = searchdomainManager.aIProvider;
-        SQLHelper helper = searchdomainManager.helper;
+        EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache = searchdomainManager.EmbeddingCache;
+        AIProvider aIProvider = searchdomainManager.AiProvider;
+        SQLHelper helper = searchdomainManager.Helper;
 
         List<JSONEntity>? jsonEntities = JsonSerializer.Deserialize<List<JSONEntity>>(json);
         if (jsonEntities is null)
@@ -57,230 +59,418 @@ public class SearchdomainHelper(ILogger<SearchdomainHelper> logger, DatabaseHelp
             return null;
         }
 
-        // toBeCached: model -> [datapoint.text * n]
+        // Prefetch embeddings
         Dictionary<string, List<string>> toBeCached = [];
+        Dictionary<string, List<string>> toBeCachedParallel = [];
         foreach (JSONEntity jSONEntity in jsonEntities)
         {
+            Dictionary<string, List<string>> targetDictionary = toBeCached;
+            if (searchdomainManager.GetSearchdomain(jSONEntity.Searchdomain).Settings.ParallelEmbeddingsPrefetch)
+            {
+                targetDictionary = toBeCachedParallel;
+            }
             foreach (JSONDatapoint datapoint in jSONEntity.Datapoints)
             {
                 foreach (string model in datapoint.Model)
                 {
-                    if (!toBeCached.ContainsKey(model))
+                    if (!targetDictionary.ContainsKey(model))
                     {
-                        toBeCached[model] = [];
+                        targetDictionary[model] = [];
                     }
-                    toBeCached[model].Add(datapoint.Text);
+                    targetDictionary[model].Add(datapoint.Text);
                 }
             }
         }
+        
+        foreach (var toBeCachedKV in toBeCached)
+        {
+            string model = toBeCachedKV.Key;
+            List<string> uniqueStrings = [.. toBeCachedKV.Value.Distinct()];
+            Datapoint.GetEmbeddings([.. uniqueStrings], [model], aIProvider, embeddingCache);
+        }
+        Parallel.ForEach(toBeCachedParallel, toBeCachedParallelKV =>
+        {
+            string model = toBeCachedParallelKV.Key;
+            List<string> uniqueStrings = [.. toBeCachedParallelKV.Value.Distinct()];
+            Datapoint.GetEmbeddings([.. uniqueStrings], [model], aIProvider, embeddingCache);
+        });
+        // Index/parse the entities
         ConcurrentQueue<Entity> retVal = [];
         ParallelOptions parallelOptions = new() { MaxDegreeOfParallelism = 16 }; // <-- This is needed! Otherwise if we try to index 100+ entities at once, it spawns 100 threads, exploding the SQL pool
-        Parallel.ForEach(jsonEntities, parallelOptions, jSONEntity =>
+
+        List<Task> entityTasks = [];
+        foreach (JSONEntity jSONEntity in jsonEntities)
         {
-            var entity = EntityFromJSON(searchdomainManager, logger, jSONEntity);
-            if (entity is not null)
+            entityTasks.Add(Task.Run(async () =>
             {
-                retVal.Enqueue(entity);
+                var entity = await EntityFromJSON(searchdomainManager, logger, jSONEntity);
+                if (entity is not null)
+                {
+                    retVal.Enqueue(entity);
+                }
+            }));
+            
+            if (entityTasks.Count >= parallelOptions.MaxDegreeOfParallelism)
+            {
+                await Task.WhenAny(entityTasks);
+                entityTasks.RemoveAll(t => t.IsCompleted);
             }
-        });
+        }
+        
+        await Task.WhenAll(entityTasks);
+
         return [.. retVal];
     }
 
-    public Entity? EntityFromJSON(SearchdomainManager searchdomainManager, ILogger logger, JSONEntity jsonEntity) //string json)
+    public async Task<Entity?> EntityFromJSON(SearchdomainManager searchdomainManager, ILogger logger, JSONEntity jsonEntity)
     {
-        SQLHelper helper = searchdomainManager.helper.DuplicateConnection();
+        var stopwatch = Stopwatch.StartNew();
+
+        SQLHelper helper = searchdomainManager.Helper;
         Searchdomain searchdomain = searchdomainManager.GetSearchdomain(jsonEntity.Searchdomain);
-        List<Entity> entityCache = searchdomain.entityCache;
-        AIProvider aIProvider = searchdomain.aIProvider;
-        LRUCache<string, Dictionary<string, float[]>> embeddingCache = searchdomain.embeddingCache;
-        Entity? preexistingEntity = entityCache.FirstOrDefault(entity => entity.name == jsonEntity.Name);
+        int id_searchdomain = searchdomain.Id;
+        ConcurrentDictionary<string, Entity> entityCache = searchdomain.EntityCache;
+        AIProvider aIProvider = searchdomain.AiProvider;
+        EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache = searchdomain.EmbeddingCache;
         bool invalidateSearchCache = false;
 
-        if (preexistingEntity is not null)
+
+        bool hasEntity = entityCache.TryGetValue(jsonEntity.Name, out Entity? preexistingEntity);
+
+        if (hasEntity && preexistingEntity is not null)
         {
-            int? preexistingEntityID = _databaseHelper.GetEntityID(helper, jsonEntity.Name, jsonEntity.Searchdomain);
-            if (preexistingEntityID is null)
-            {
-                _logger.LogCritical("Unable to index entity {jsonEntity.Name} because it already exists in the searchdomain but not in the database.", [jsonEntity.Name]);
-                throw new Exception($"Unable to index entity {jsonEntity.Name} because it already exists in the searchdomain but not in the database.");
-            }
+
+            int preexistingEntityID = preexistingEntity.Id;
+
             Dictionary<string, string> attributes = jsonEntity.Attributes;
             
-            // Attribute
-            foreach (KeyValuePair<string, string> attributesKV in preexistingEntity.attributes.ToList())
+            // Attribute - get changes
+            List<(string attribute, string newValue, int entityId)> updatedAttributes = new(preexistingEntity.Attributes.Count);
+            List<(string attribute, int entityId)> deletedAttributes = new(preexistingEntity.Attributes.Count);
+            List<(string attributeKey, string attribute, int entityId)> addedAttributes = new(jsonEntity.Attributes.Count);
+            foreach (KeyValuePair<string, string> attributesKV in preexistingEntity.Attributes) //.ToList())
             {
                 string oldAttributeKey = attributesKV.Key;
                 string oldAttribute = attributesKV.Value;
                 bool newHasAttribute = jsonEntity.Attributes.TryGetValue(oldAttributeKey, out string? newAttribute);
                 if (newHasAttribute && newAttribute is not null && newAttribute != oldAttribute)
                 {
-                    // Attribute - Updated
-                    Dictionary<string, dynamic> parameters = new()
-                    {
-                        { "newValue", newAttribute },
-                        { "entityId", preexistingEntityID },
-                        { "attribute", oldAttributeKey}
-                    };
-                    helper.ExecuteSQLNonQuery("UPDATE attribute SET value=@newValue WHERE id_entity=@entityId AND attribute=@attribute", parameters);
-                    preexistingEntity.attributes[oldAttributeKey] = newAttribute;
+                    updatedAttributes.Add((attribute: oldAttributeKey, newValue: newAttribute, entityId: (int)preexistingEntityID));
                 } else if (!newHasAttribute)
                 {
-                    // Attribute - Deleted
-                    Dictionary<string, dynamic> parameters = new()
-                    {
-                        { "entityId", preexistingEntityID },
-                        { "attribute", oldAttributeKey}
-                    };
-                    helper.ExecuteSQLNonQuery("DELETE FROM attribute WHERE id_entity=@entityId AND attribute=@attribute", parameters);
-                    preexistingEntity.attributes.Remove(oldAttributeKey);
+                    deletedAttributes.Add((attribute: oldAttributeKey, entityId: (int)preexistingEntityID));
                 }
             }
+
             foreach (var attributesKV in jsonEntity.Attributes)
             {
                 string newAttributeKey = attributesKV.Key;
                 string newAttribute = attributesKV.Value;
-                bool preexistingHasAttribute = preexistingEntity.attributes.TryGetValue(newAttributeKey, out string? preexistingAttribute);
+                bool preexistingHasAttribute = preexistingEntity.Attributes.TryGetValue(newAttributeKey, out string? preexistingAttribute);
                 if (!preexistingHasAttribute)
                 {
                     // Attribute - New
-                    DatabaseHelper.DatabaseInsertAttribute(helper, newAttributeKey, newAttribute, (int)preexistingEntityID);
-                    preexistingEntity.attributes.Add(newAttributeKey, newAttribute);
+                    addedAttributes.Add((attributeKey: newAttributeKey, attribute: newAttribute, entityId: (int)preexistingEntityID));
                 }
             }
 
-            // Datapoint
-            foreach (Datapoint datapoint_ in preexistingEntity.datapoints.ToList())
+            if (updatedAttributes.Count != 0 || deletedAttributes.Count != 0 || addedAttributes.Count != 0)
+                _logger.LogDebug("EntityFromJSON - Updating existing entity. name: {name}, updatedAttributes: {updatedAttributes}, deletedAttributes: {deletedAttributes}, addedAttributes: {addedAttributes}", [preexistingEntity.Name, updatedAttributes.Count, deletedAttributes.Count, addedAttributes.Count]);
+            // Attribute - apply changes
+            if (updatedAttributes.Count != 0)
+            {
+                // Update
+                await DatabaseHelper.DatabaseUpdateAttributes(helper, updatedAttributes);
+                lock (preexistingEntity.Attributes)
+                {
+                    updatedAttributes.ForEach(attribute => preexistingEntity.Attributes[attribute.attribute] = attribute.newValue);
+                }
+            }
+            if (deletedAttributes.Count != 0)
+            {
+                // Delete
+                await DatabaseHelper.DatabaseDeleteAttributes(helper, deletedAttributes);
+                lock (preexistingEntity.Attributes)
+                {
+                    deletedAttributes.ForEach(attribute => preexistingEntity.Attributes.Remove(attribute.attribute));
+                }
+            }
+            if (addedAttributes.Count != 0)
+            {
+                // Insert
+                await DatabaseHelper.DatabaseInsertAttributes(helper, addedAttributes);
+                lock (preexistingEntity.Attributes)
+                {
+                    addedAttributes.ForEach(attribute => preexistingEntity.Attributes.Add(attribute.attributeKey, attribute.attribute));
+                }
+            }
+
+            // Datapoint - get changes
+            List<Datapoint> deletedDatapointInstances = new(preexistingEntity.Datapoints.Count);
+            List<string> deletedDatapoints = new(preexistingEntity.Datapoints.Count);
+            List<(string datapointName, int entityId, JSONDatapoint jsonDatapoint, string hash)> updatedDatapointsText = new(preexistingEntity.Datapoints.Count);
+            List<(string datapointName, string probMethod, string similarityMethod, int entityId, JSONDatapoint jsonDatapoint)> updatedDatapointsNonText = new(preexistingEntity.Datapoints.Count);
+            List<Datapoint> createdDatapointInstances = [];
+            List<(string name, ProbMethodEnum probmethod_embedding, SimilarityMethodEnum similarityMethod, string hash, Dictionary<string, float[]> embeddings, JSONDatapoint datapoint)> createdDatapoints = new(jsonEntity.Datapoints.Length);
+            
+            foreach (Datapoint datapoint_ in preexistingEntity.Datapoints.ToList())
             {
                 Datapoint datapoint = datapoint_; // To enable replacing the datapoint reference as foreach iterators cannot be overwritten
-                bool newEntityHasDatapoint = jsonEntity.Datapoints.Any(x => x.Name == datapoint.name);
+                JSONDatapoint? newEntityDatapoint = jsonEntity.Datapoints.FirstOrDefault(x => x.Name == datapoint.Name);
+                bool newEntityHasDatapoint = newEntityDatapoint is not null;
                 if (!newEntityHasDatapoint)
                 {
                     // Datapoint - Deleted
-                    Dictionary<string, dynamic> parameters = new()
-                    {
-                        { "datapointName", datapoint.name },
-                        { "entityId", preexistingEntityID}
-                    };
-                    helper.ExecuteSQLNonQuery("DELETE e FROM embedding e JOIN datapoint d ON e.id_datapoint=d.id WHERE d.name=@datapointName AND d.id_entity=@entityId", parameters);
-                    helper.ExecuteSQLNonQuery("DELETE FROM datapoint WHERE id_entity=@entityId AND name=@datapointName", parameters);
-                    preexistingEntity.datapoints.Remove(datapoint);
+                    deletedDatapointInstances.Add(datapoint);
+                    deletedDatapoints.Add(datapoint.Name);
                     invalidateSearchCache = true;
                 } else
                 {
-                    JSONDatapoint? newEntityDatapoint = jsonEntity.Datapoints.FirstOrDefault(x => x.Name == datapoint.name);
-                    if (newEntityDatapoint is not null && newEntityDatapoint.Text is not null)
+                    string? hash = newEntityDatapoint?.Text is not null ? GetHash(newEntityDatapoint) : null;
+                    if (
+                        newEntityDatapoint is not null
+                        && newEntityDatapoint.Text is not null
+                        && hash is not null
+                        && hash != datapoint.Hash)
                     {
                         // Datapoint - Updated (text)
-                        Dictionary<string, dynamic> parameters = new()
+                        updatedDatapointsText.Add(new()
                         {
-                            { "datapointName", datapoint.name },
-                            { "entityId", preexistingEntityID}
-                        };
-                        helper.ExecuteSQLNonQuery("DELETE e FROM embedding e JOIN datapoint d ON e.id_datapoint=d.id WHERE d.name=@datapointName AND d.id_entity=@entityId", parameters);
-                        helper.ExecuteSQLNonQuery("DELETE FROM datapoint WHERE id_entity=@entityId AND name=@datapointName", parameters);
-                        preexistingEntity.datapoints.Remove(datapoint);
-                        Datapoint newDatapoint = DatabaseInsertDatapointWithEmbeddings(helper, searchdomain, newEntityDatapoint, (int)preexistingEntityID);
-                        preexistingEntity.datapoints.Add(newDatapoint);
-                        datapoint = newDatapoint;
+                            datapointName = newEntityDatapoint.Name,
+                            entityId = (int)preexistingEntityID,
+                            jsonDatapoint = newEntityDatapoint,
+                            hash = hash
+                        });
                         invalidateSearchCache = true;
                     }
-                    if (newEntityDatapoint is not null && (newEntityDatapoint.Probmethod_embedding != datapoint.probMethod.probMethodEnum || newEntityDatapoint.SimilarityMethod != datapoint.similarityMethod.similarityMethodEnum))
+                    if (
+                        newEntityDatapoint is not null
+                        && (newEntityDatapoint.Probmethod_embedding != datapoint.ProbMethod.ProbMethodEnum
+                            || newEntityDatapoint.SimilarityMethod != datapoint.SimilarityMethod.SimilarityMethodEnum))
                     {
                         // Datapoint - Updated (probmethod or similaritymethod)
-                        Dictionary<string, dynamic> parameters = new()
+                        updatedDatapointsNonText.Add(new()
                         {
-                            { "probmethod", newEntityDatapoint.Probmethod_embedding.ToString() },
-                            { "similaritymethod", newEntityDatapoint.SimilarityMethod.ToString() },
-                            { "datapointName", datapoint.name },
-                            { "entityId", preexistingEntityID}
-                        };
-                        helper.ExecuteSQLNonQuery("UPDATE datapoint SET probmethod_embedding=@probmethod, similaritymethod=@similaritymethod WHERE id_entity=@entityId AND name=@datapointName", parameters);
-                        Datapoint preexistingDatapoint = preexistingEntity.datapoints.First(x => x == datapoint); // The for loop is a copy. This retrieves the original such that it can be updated.
-                        preexistingDatapoint.probMethod = new(newEntityDatapoint.Probmethod_embedding, _logger);
-                        preexistingDatapoint.similarityMethod = new(newEntityDatapoint.SimilarityMethod, _logger);
+                            datapointName = newEntityDatapoint.Name,
+                            entityId = (int)preexistingEntityID,
+                            probMethod = newEntityDatapoint.Probmethod_embedding.ToString(),
+                            similarityMethod = newEntityDatapoint.SimilarityMethod.ToString(),
+                            jsonDatapoint = newEntityDatapoint
+                        });
                         invalidateSearchCache = true;
                     }
                 }
             }
+
             foreach (JSONDatapoint jsonDatapoint in jsonEntity.Datapoints)
             {
-                bool oldEntityHasDatapoint = preexistingEntity.datapoints.Any(x => x.name == jsonDatapoint.Name);
+                bool oldEntityHasDatapoint = preexistingEntity.Datapoints.Any(x => x.Name == jsonDatapoint.Name);
                 if (!oldEntityHasDatapoint)
                 {
                     // Datapoint - New
-                    Datapoint datapoint = DatabaseInsertDatapointWithEmbeddings(helper, searchdomain, jsonDatapoint, (int)preexistingEntityID);
-                    preexistingEntity.datapoints.Add(datapoint);
+                    createdDatapoints.Add(new()
+                    {
+                        name = jsonDatapoint.Name,
+                        probmethod_embedding = jsonDatapoint.Probmethod_embedding,
+                        similarityMethod = jsonDatapoint.SimilarityMethod,
+                        hash = GetHash(jsonDatapoint),
+                        embeddings = Datapoint.GetEmbeddings(
+                            jsonDatapoint.Text ?? throw new Exception("jsonDatapoint.Text must not be null when retrieving embeddings"),
+                            [.. jsonDatapoint.Model],
+                            aIProvider,
+                            embeddingCache
+                        ),
+                        datapoint = jsonDatapoint
+                    });
                     invalidateSearchCache = true;
                 }
             }
 
+
+            if (deletedDatapointInstances.Count != 0 || createdDatapoints.Count != 0 || addedAttributes.Count != 0 || updatedDatapointsNonText.Count != 0)
+                _logger.LogDebug(
+                    "EntityFromJSON - Updating existing entity. name: {name}, deletedDatapointInstances: {deletedDatapointInstances}, createdDatapoints: {createdDatapoints}, addedAttributes: {addedAttributes}, updatedDatapointsNonText: {updatedDatapointsNonText}",
+                    [preexistingEntity.Name, deletedDatapointInstances.Count, createdDatapoints.Count, addedAttributes.Count, updatedDatapointsNonText.Count]);
+            // Datapoint - apply changes
+            // Deleted
+            if (deletedDatapointInstances.Count != 0)
+            {
+                await DatabaseHelper.DatabaseDeleteEmbeddingsAndDatapoints(helper, deletedDatapoints, (int)preexistingEntityID);
+                preexistingEntity.Datapoints = [.. preexistingEntity.Datapoints
+                    .Where(x =>
+                        !deletedDatapointInstances.Contains(x)
+                    )
+                ];
+            }
+            // Created
+            if (createdDatapoints.Count != 0)
+            {
+                List<Datapoint> datapoint = await DatabaseInsertDatapointsWithEmbeddings(helper, searchdomain, [.. createdDatapoints.Select(element => (element.datapoint, element.hash))], (int)preexistingEntityID, id_searchdomain);
+                datapoint.ForEach(x => preexistingEntity.Datapoints.Add(x));
+            }
+            // Datapoint - Updated (text)
+            if (updatedDatapointsText.Count != 0)
+            {
+                await DatabaseHelper.DatabaseDeleteEmbeddingsAndDatapoints(helper, [.. updatedDatapointsText.Select(datapoint => datapoint.datapointName)], (int)preexistingEntityID);
+                // Remove from datapoints
+                var namesToRemove = updatedDatapointsText
+                    .Select(d => d.datapointName)
+                    .ToHashSet();
+                var newBag = new ConcurrentBag<Datapoint>(
+                    preexistingEntity.Datapoints
+                        .Where(x => !namesToRemove.Contains(x.Name))
+                );
+                preexistingEntity.Datapoints = newBag;
+                // Insert into database
+                List<Datapoint> datapoints = await DatabaseInsertDatapointsWithEmbeddings(helper, searchdomain, [.. updatedDatapointsText.Select(element => (datapoint: element.jsonDatapoint, hash: element.hash))], (int)preexistingEntityID, id_searchdomain);
+                // Insert into datapoints
+                datapoints.ForEach(datapoint => preexistingEntity.Datapoints.Add(datapoint));
+            }
+            // Datapoint - Updated (probmethod or similaritymethod)
+            if (updatedDatapointsNonText.Count != 0)
+            {
+                await DatabaseHelper.DatabaseUpdateDatapoint(
+                    helper,
+                    [.. updatedDatapointsNonText.Select(element => (element.datapointName, element.probMethod, element.similarityMethod))],
+                    (int)preexistingEntityID
+                );
+                updatedDatapointsNonText.ForEach(element =>
+                {
+                    Datapoint preexistingDatapoint = preexistingEntity.Datapoints.First(x => x.Name == element.datapointName);
+                    preexistingDatapoint.ProbMethod = new(element.jsonDatapoint.Probmethod_embedding);
+                    preexistingDatapoint.SimilarityMethod = new(element.jsonDatapoint.SimilarityMethod);
+                });
+            } 
+
+
             if (invalidateSearchCache)
             {
+
                 searchdomain.ReconciliateOrInvalidateCacheForNewOrUpdatedEntity(preexistingEntity);
+                searchdomain.UpdateModelsInUse();
             }
-            searchdomain.UpdateModelsInUse();
+
             return preexistingEntity;
         }
         else
         {
-            int id_entity = DatabaseHelper.DatabaseInsertEntity(helper, jsonEntity.Name, jsonEntity.Probmethod, _databaseHelper.GetSearchdomainID(helper, jsonEntity.Searchdomain));
+            int id_entity = await DatabaseHelper.DatabaseInsertEntity(helper, jsonEntity.Name, jsonEntity.Probmethod, id_searchdomain);
+            List<(string attribute, string value, int id_entity)> toBeInsertedAttributes = [];
             foreach (KeyValuePair<string, string> attribute in jsonEntity.Attributes)
             {
-                DatabaseHelper.DatabaseInsertAttribute(helper, attribute.Key, attribute.Value, id_entity); // TODO implement bulk insert to reduce number of queries
+                toBeInsertedAttributes.Add(new() {
+                    attribute = attribute.Key,
+                    value = attribute.Value,
+                    id_entity = id_entity
+                });
             }
 
-            List<Datapoint> datapoints = [];
+            var insertAttributesTask = DatabaseHelper.DatabaseInsertAttributes(helper, toBeInsertedAttributes);
+
+            List<(JSONDatapoint datapoint, string hash)> toBeInsertedDatapoints = [];
+            ConcurrentBag<string> usedModels = searchdomain.ModelsInUse;
             foreach (JSONDatapoint jsonDatapoint in jsonEntity.Datapoints)
             {
                 string hash = Convert.ToBase64String(SHA256.HashData(Encoding.UTF8.GetBytes(jsonDatapoint.Text)));
-                Datapoint datapoint = DatabaseInsertDatapointWithEmbeddings(helper, searchdomain, jsonDatapoint, id_entity, hash);
-                datapoints.Add(datapoint);
+                toBeInsertedDatapoints.Add(new()
+                {
+                    datapoint = jsonDatapoint,
+                    hash = hash
+                });
+                foreach (string model in jsonDatapoint.Model)
+                {
+                    if (!usedModels.Contains(model))
+                    {
+                        usedModels.Add(model);
+                    }
+                }
             }
 
+            List<Datapoint> datapoints = await DatabaseInsertDatapointsWithEmbeddings(helper, searchdomain, toBeInsertedDatapoints, id_entity, id_searchdomain);
+            
             var probMethod = Probmethods.GetMethod(jsonEntity.Probmethod) ?? throw new ProbMethodNotFoundException(jsonEntity.Probmethod);
-            Entity entity = new(jsonEntity.Attributes, probMethod, jsonEntity.Probmethod.ToString(), datapoints, jsonEntity.Name)
+            Entity entity = new(jsonEntity.Attributes, probMethod, jsonEntity.Probmethod.ToString(), [.. datapoints], jsonEntity.Name, jsonEntity.Searchdomain)
             {
-                id = id_entity
+                Id = id_entity
             };
-            entityCache.Add(entity);
+            entityCache[jsonEntity.Name] = entity;
+
             searchdomain.ReconciliateOrInvalidateCacheForNewOrUpdatedEntity(entity);
-            searchdomain.UpdateModelsInUse();
+            await insertAttributesTask;
             return entity;
         }
     }
 
-    public Datapoint DatabaseInsertDatapointWithEmbeddings(SQLHelper helper, Searchdomain searchdomain, JSONDatapoint jsonDatapoint, int id_entity, string? hash = null)
+    public async Task<List<Datapoint>> DatabaseInsertDatapointsWithEmbeddings(SQLHelper helper, Searchdomain searchdomain, List<(JSONDatapoint datapoint, string hash)> values, int id_entity, int id_searchdomain)
+    {
+        List<Datapoint> result = [];
+        List<(string name, ProbMethodEnum probmethod_embedding, SimilarityMethodEnum similarityMethod, string hash)> toBeInsertedDatapoints = [];
+        List<(int id_datapoint, string model, byte[] embedding)> toBeInsertedEmbeddings = [];
+        foreach ((JSONDatapoint datapoint, string hash) value in values)
+        {
+            Datapoint datapoint = await BuildDatapointFromJsonDatapoint(value.datapoint, id_entity, searchdomain, value.hash);
+
+            toBeInsertedDatapoints.Add(new()
+            {
+                name = datapoint.Name,
+                probmethod_embedding = datapoint.ProbMethod.ProbMethodEnum,
+                similarityMethod = datapoint.SimilarityMethod.SimilarityMethodEnum,
+                hash = value.hash
+            });
+            foreach ((string, float[]) embedding in datapoint.Embeddings)
+            {
+                toBeInsertedEmbeddings.Add(new()
+                {
+                    id_datapoint = datapoint.Id,
+                    model = embedding.Item1,
+                    embedding = BytesFromFloatArray(embedding.Item2)
+                });
+            }
+            result.Add(datapoint);
+
+        }
+        
+        await DatabaseHelper.DatabaseInsertEmbeddingBulk(helper, toBeInsertedEmbeddings, id_entity, id_searchdomain);
+        return result;
+    }
+
+    public async Task<Datapoint> DatabaseInsertDatapointWithEmbeddings(SQLHelper helper, Searchdomain searchdomain, JSONDatapoint jsonDatapoint, int id_entity, int id_searchdomain, string? hash = null)
     {
         if (jsonDatapoint.Text is null)
         {
             throw new Exception("jsonDatapoint.Text must not be null at this point");
         }
-        hash ??= Convert.ToBase64String(SHA256.HashData(Encoding.UTF8.GetBytes(jsonDatapoint.Text)));
-        Datapoint datapoint = BuildDatapointFromJsonDatapoint(jsonDatapoint, id_entity, searchdomain, hash);
-        int id_datapoint = DatabaseHelper.DatabaseInsertDatapoint(helper, jsonDatapoint.Name, jsonDatapoint.Probmethod_embedding, jsonDatapoint.SimilarityMethod, hash, id_entity); // TODO make this a bulk add action to reduce number of queries
+        hash ??= GetHash(jsonDatapoint);
+        Datapoint datapoint = await BuildDatapointFromJsonDatapoint(jsonDatapoint, id_entity, searchdomain, hash);
+        int id_datapoint = await DatabaseHelper.DatabaseInsertDatapoint(helper, jsonDatapoint.Name, jsonDatapoint.Probmethod_embedding, jsonDatapoint.SimilarityMethod, hash, id_entity); // TODO make this a bulk add action to reduce number of queries
         List<(string model, byte[] embedding)> data = [];
-        foreach ((string, float[]) embedding in datapoint.embeddings)
+        foreach ((string, float[]) embedding in datapoint.Embeddings)
         {
             data.Add((embedding.Item1, BytesFromFloatArray(embedding.Item2)));
         }
-        DatabaseHelper.DatabaseInsertEmbeddingBulk(helper, id_datapoint, data);
+        await DatabaseHelper.DatabaseInsertEmbeddingBulk(helper, id_datapoint, data, id_entity, id_searchdomain);
         return datapoint;
     }
 
-    public Datapoint BuildDatapointFromJsonDatapoint(JSONDatapoint jsonDatapoint, int entityId, Searchdomain searchdomain, string? hash = null)
+    public string GetHash(JSONDatapoint jsonDatapoint)
+    {
+        return Convert.ToBase64String(SHA256.HashData(Encoding.UTF8.GetBytes(jsonDatapoint.Text ?? throw new Exception("jsonDatapoint.Text must not be null to compute hash"))));
+    }
+
+    public async Task<Datapoint> BuildDatapointFromJsonDatapoint(JSONDatapoint jsonDatapoint, int entityId, Searchdomain searchdomain, string? hash = null)
     {
         if (jsonDatapoint.Text is null)
         {
             throw new Exception("jsonDatapoint.Text must not be null at this point");
         }
-        using SQLHelper helper = searchdomain.helper.DuplicateConnection();
-        LRUCache<string, Dictionary<string, float[]>> embeddingCache = searchdomain.embeddingCache;
+        SQLHelper helper = searchdomain.Helper;
+        EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache = searchdomain.EmbeddingCache;
         hash ??= Convert.ToBase64String(SHA256.HashData(Encoding.UTF8.GetBytes(jsonDatapoint.Text)));
-        DatabaseHelper.DatabaseInsertDatapoint(helper, jsonDatapoint.Name, jsonDatapoint.Probmethod_embedding, jsonDatapoint.SimilarityMethod, hash, entityId);
-        Dictionary<string, float[]> embeddings = Datapoint.GenerateEmbeddings(jsonDatapoint.Text, [.. jsonDatapoint.Model], searchdomain.aIProvider, embeddingCache);
-        var probMethod_embedding = new ProbMethod(jsonDatapoint.Probmethod_embedding, logger) ?? throw new ProbMethodNotFoundException(jsonDatapoint.Probmethod_embedding);
-        var similarityMethod = new SimilarityMethod(jsonDatapoint.SimilarityMethod, logger) ?? throw new SimilarityMethodNotFoundException(jsonDatapoint.SimilarityMethod);
-        return new Datapoint(jsonDatapoint.Name, probMethod_embedding, similarityMethod, hash, [.. embeddings.Select(kv => (kv.Key, kv.Value))]);
+        int id = await DatabaseHelper.DatabaseInsertDatapoint(helper, jsonDatapoint.Name, jsonDatapoint.Probmethod_embedding, jsonDatapoint.SimilarityMethod, hash, entityId);
+        Dictionary<string, float[]> embeddings = Datapoint.GetEmbeddings(jsonDatapoint.Text, [.. jsonDatapoint.Model], searchdomain.AiProvider, embeddingCache);
+        var probMethod_embedding = new ProbMethod(jsonDatapoint.Probmethod_embedding) ?? throw new ProbMethodNotFoundException(jsonDatapoint.Probmethod_embedding);
+        var similarityMethod = new SimilarityMethod(jsonDatapoint.SimilarityMethod) ?? throw new SimilarityMethodNotFoundException(jsonDatapoint.SimilarityMethod);
+        return new Datapoint(jsonDatapoint.Name, probMethod_embedding, similarityMethod, hash, [.. embeddings.Select(kv => (kv.Key, kv.Value))], id);
     }
 
     public static (Searchdomain?, int?, string?) TryGetSearchdomain(SearchdomainManager searchdomainManager, string searchdomain, ILogger logger)

src/Server/Migrations/DatabaseMigrations.cs

@@ -12,6 +12,11 @@ public static class DatabaseMigrations
         int initialDatabaseVersion = DatabaseGetVersion(helper);
         int databaseVersion = initialDatabaseVersion;
 
+        if (databaseVersion == 0)
+        {
+            databaseVersion = Create(helper);
+        }
+
         var updateMethods = typeof(DatabaseMigrations)
             .GetMethods(BindingFlags.Public | BindingFlags.Static)
             .Where(m => m.Name.StartsWith("UpdateFrom") && m.ReturnType == typeof(int))
@@ -29,66 +34,113 @@ public static class DatabaseMigrations
 
         if (databaseVersion != initialDatabaseVersion)
         {
-            helper.ExecuteSQLNonQuery("UPDATE settings SET value = @databaseVersion", new() { ["databaseVersion"] = databaseVersion.ToString() });
+            var _ = helper.ExecuteSQLNonQuery("UPDATE settings SET value = @databaseVersion", new() { ["databaseVersion"] = databaseVersion.ToString() }).Result;
         }
     }
 
     public static int DatabaseGetVersion(SQLHelper helper)
     {
         DbDataReader reader = helper.ExecuteSQLCommand("show tables", []);
-        bool hasTables = reader.Read();
-        reader.Close();
-        if (!hasTables)
+        try
         {
-            return 0;
+            bool hasTables = reader.Read();
+            if (!hasTables)
+            {
+                return 0;
+            }
+        } finally
+        {
+            reader.Close();
         }
 
         reader = helper.ExecuteSQLCommand("show tables like '%settings%'", []);
-        bool hasSystemTable = reader.Read();
-        reader.Close();
-        if (!hasSystemTable)
+        try
         {
-            return 1;
+            bool hasSystemTable = reader.Read();
+            if (!hasSystemTable)
+            {
+                return 1;
+            }
+        } finally
+        {
+            reader.Close();
         }
         reader = helper.ExecuteSQLCommand("SELECT value FROM settings WHERE name=\"DatabaseVersion\"", []);
-        reader.Read();
-        string rawVersion = reader.GetString(0);
-        reader.Close();
-        bool success = int.TryParse(rawVersion, out int version);
-        if (!success)
+        try
         {
-            throw new DatabaseVersionException();
+            reader.Read();
+            string rawVersion = reader.GetString(0);
+            bool success = int.TryParse(rawVersion, out int version);
+            if (!success)
+            {
+                throw new DatabaseVersionException();
+            }
+            return version;
+        } finally
+        {
+            reader.Close();
         }
-        return version;
     }
 
     public static int Create(SQLHelper helper)
     {
-        helper.ExecuteSQLNonQuery("CREATE TABLE searchdomain (id int PRIMARY KEY auto_increment, name varchar(512), settings JSON);", []);
-        helper.ExecuteSQLNonQuery("CREATE TABLE entity (id int PRIMARY KEY auto_increment, name varchar(512), probmethod varchar(128), id_searchdomain int, FOREIGN KEY (id_searchdomain) REFERENCES searchdomain(id));", []);
-        helper.ExecuteSQLNonQuery("CREATE TABLE attribute (id int PRIMARY KEY auto_increment, id_entity int, attribute varchar(512), value longtext, FOREIGN KEY (id_entity) REFERENCES entity(id));", []);
-        helper.ExecuteSQLNonQuery("CREATE TABLE datapoint (id int PRIMARY KEY auto_increment, name varchar(512), probmethod_embedding varchar(512), id_entity int, FOREIGN KEY (id_entity) REFERENCES entity(id));", []);
-        helper.ExecuteSQLNonQuery("CREATE TABLE embedding (id int PRIMARY KEY auto_increment, id_datapoint int, model varchar(512), embedding blob, FOREIGN KEY (id_datapoint) REFERENCES datapoint(id));", []);
+        var _ = helper.ExecuteSQLNonQuery("CREATE TABLE searchdomain (id int PRIMARY KEY auto_increment, name varchar(512), settings JSON);", []).Result;
+        _ = helper.ExecuteSQLNonQuery("CREATE TABLE entity (id int PRIMARY KEY auto_increment, name varchar(512), probmethod varchar(128), id_searchdomain int, FOREIGN KEY (id_searchdomain) REFERENCES searchdomain(id));", []).Result;
+        _ = helper.ExecuteSQLNonQuery("CREATE TABLE attribute (id int PRIMARY KEY auto_increment, id_entity int, attribute varchar(512), value longtext, FOREIGN KEY (id_entity) REFERENCES entity(id));", []).Result;
+        _ = helper.ExecuteSQLNonQuery("CREATE TABLE datapoint (id int PRIMARY KEY auto_increment, name varchar(512), probmethod_embedding varchar(512), id_entity int, FOREIGN KEY (id_entity) REFERENCES entity(id));", []).Result;
+        _ = helper.ExecuteSQLNonQuery("CREATE TABLE embedding (id int PRIMARY KEY auto_increment, id_datapoint int, model varchar(512), embedding blob, FOREIGN KEY (id_datapoint) REFERENCES datapoint(id));", []).Result;
         return 1;
     }
 
     public static int UpdateFrom1(SQLHelper helper)
     {
-        helper.ExecuteSQLNonQuery("CREATE TABLE settings (name varchar(512), value varchar(8192));", []);
-        helper.ExecuteSQLNonQuery("INSERT INTO settings (name, value) VALUES (\"DatabaseVersion\", \"2\");", []);
+        var _ = helper.ExecuteSQLNonQuery("CREATE TABLE settings (name varchar(512), value varchar(8192));", []).Result;
+        _ = helper.ExecuteSQLNonQuery("INSERT INTO settings (name, value) VALUES (\"DatabaseVersion\", \"2\");", []).Result;
         return 2;
     }
 
     public static int UpdateFrom2(SQLHelper helper)
     {
-        helper.ExecuteSQLNonQuery("ALTER TABLE datapoint ADD hash VARCHAR(44);", []);
-        helper.ExecuteSQLNonQuery("UPDATE datapoint SET hash='';", []);
+        var _ = helper.ExecuteSQLNonQuery("ALTER TABLE datapoint ADD hash VARCHAR(44);", []).Result;
+        _ = helper.ExecuteSQLNonQuery("UPDATE datapoint SET hash='';", []).Result;
         return 3;
     }
 
     public static int UpdateFrom3(SQLHelper helper)
     {
-        helper.ExecuteSQLNonQuery("ALTER TABLE datapoint ADD COLUMN similaritymethod VARCHAR(512) NULL DEFAULT 'Cosine' AFTER probmethod_embedding", []);
+        var _ = helper.ExecuteSQLNonQuery("ALTER TABLE datapoint ADD COLUMN similaritymethod VARCHAR(512) NULL DEFAULT 'Cosine' AFTER probmethod_embedding", []).Result;
         return 4;
     }
+
+    public static int UpdateFrom4(SQLHelper helper)
+    {
+        var _ = helper.ExecuteSQLNonQuery("UPDATE searchdomain SET settings = JSON_SET(settings, '$.QueryCacheSize', 1000000) WHERE JSON_EXTRACT(settings, '$.QueryCacheSize') is NULL;", []).Result; // Set QueryCacheSize to a default of 1000000
+        return 5;
+    }
+
+    public static int UpdateFrom5(SQLHelper helper)
+    {
+        // Add id_entity to embedding
+        var _ = helper.ExecuteSQLNonQuery("ALTER TABLE embedding ADD COLUMN id_entity INT NULL", []).Result;
+        int count;
+        do
+        {
+            count = helper.ExecuteSQLNonQuery("UPDATE embedding e JOIN datapoint d ON d.id = e.id_datapoint JOIN (SELECT id FROM embedding WHERE id_entity IS NULL LIMIT 10000) x on x.id = e.id SET e.id_entity = d.id_entity;", []).Result;
+        } while (count == 10000);
+        
+        _ = helper.ExecuteSQLNonQuery("ALTER TABLE embedding MODIFY id_entity INT NOT NULL;", []).Result;
+        _ = helper.ExecuteSQLNonQuery("CREATE INDEX idx_embedding_entity_model ON embedding (id_entity, model)", []).Result;
+
+        // Add id_searchdomain to embedding
+        _ = helper.ExecuteSQLNonQuery("ALTER TABLE embedding ADD COLUMN id_searchdomain INT NULL", []).Result;
+        do
+        {
+            count = helper.ExecuteSQLNonQuery("UPDATE embedding e JOIN entity en ON en.id = e.id_datapoint JOIN (SELECT id FROM embedding WHERE id_searchdomain IS NULL LIMIT 10000) x on x.id = e.id SET e.id_searchdomain = en.id_searchdomain;", []).Result;
+        } while (count == 10000);
+        
+        _ = helper.ExecuteSQLNonQuery("ALTER TABLE embedding MODIFY id_searchdomain INT NOT NULL;", []).Result;
+        _ = helper.ExecuteSQLNonQuery("CREATE INDEX idx_embedding_searchdomain_model ON embedding (id_searchdomain)", []).Result;
+
+        return 6;
+    }
 }

src/Server/Migrations/SQLiteMigrations.cs

@@ -0,0 +1,65 @@
+using System.Data.Common;
+
+public static class SQLiteMigrations
+{
+    public static void Migrate(DbConnection conn)
+    {
+        EnableWal(conn);
+
+        using var cmd = conn.CreateCommand();
+
+        cmd.CommandText = "PRAGMA user_version;";
+        var version = Convert.ToInt32(cmd.ExecuteScalar());
+
+        if (version == 0)
+        {
+            CreateV1(conn);
+            SetVersion(conn, 1);
+            version = 1;
+        }
+
+        if (version == 1)
+        {
+            // future migration
+            // UpdateFrom1To2(conn);
+            // SetVersion(conn, 2);
+        }
+    }
+
+    private static void EnableWal(DbConnection conn)
+    {
+        using var cmd = conn.CreateCommand();
+        cmd.CommandText = "PRAGMA journal_mode = WAL;";
+        cmd.ExecuteNonQuery();
+    }
+
+
+    private static void CreateV1(DbConnection conn)
+    {
+        using var tx = conn.BeginTransaction();
+        using var cmd = conn.CreateCommand();
+
+        cmd.CommandText = """
+            CREATE TABLE embedding_cache (
+                cache_key   TEXT NOT NULL,
+                model_key   TEXT NOT NULL,
+                embedding   BLOB NOT NULL,
+                idx       INTEGER NOT NULL,
+                PRIMARY KEY (cache_key, model_key)
+            );
+
+            CREATE INDEX idx_index
+                ON embedding_cache(idx);
+        """;
+
+        cmd.ExecuteNonQuery();
+        tx.Commit();
+    }
+
+    private static void SetVersion(DbConnection conn, int version)
+    {
+        using var cmd = conn.CreateCommand();
+        cmd.CommandText = $"PRAGMA user_version = {version};";
+        cmd.ExecuteNonQuery();
+    }
+}

src/Server/Models/ConfigModels.cs

@@ -8,10 +8,11 @@ public class EmbeddingSearchOptions : ApiKeyOptions
 {
     public required ConnectionStringsOptions ConnectionStrings { get; set; }
     public ElmahOptions? Elmah { get; set; }
-    public required long EmbeddingCacheMaxCount { get; set; }
     public required Dictionary<string, AiProvider> AiProviders { get; set; }
     public required SimpleAuthOptions SimpleAuth { get; set; }
+    public required CacheOptions Cache { get; set; }
     public required bool UseHttpsRedirection { get; set; }
+    public int? MaxRequestBodySize { get; set; }
 }
 
 public class AiProvider
@@ -38,4 +39,12 @@ public class SimpleUser
 public class ConnectionStringsOptions
 {
     public required string SQL { get; set; }
+    public string? Cache { get; set; }
+}
+
+public class CacheOptions
+{
+    public required long CacheTopN { get; set; }
+    public bool StoreEmbeddingCache { get; set; } = false;
+    public int? StoreTopN { get; set; }
 }

src/Server/Models/SQLHelper.cs

@@ -0,0 +1,109 @@
+namespace Server.Models;
+using System.Data.Common;
+
+public abstract partial class SqlHelper : IDisposable
+{
+    public DbConnection Connection { get; set; }
+    public DbDataReader? DbDataReader { get; set; }
+    public string ConnectionString { get; set; }
+    public SqlHelper(DbConnection connection, string connectionString)
+    {
+        Connection = connection;
+        ConnectionString = connectionString;
+    }
+
+    public abstract SqlHelper DuplicateConnection();
+
+    public void Dispose()
+    {
+        Connection.Close();
+        GC.SuppressFinalize(this);
+    }
+
+    public DbDataReader ExecuteSQLCommand(string query, object[] parameters)
+    {
+        lock (Connection)
+        {
+            EnsureConnected();
+            EnsureDbReaderIsClosed();
+            using DbCommand command = Connection.CreateCommand();
+            command.CommandText = query;
+            command.Parameters.AddRange(parameters);
+            DbDataReader = command.ExecuteReader();
+            return DbDataReader;
+        }
+    }
+
+    public void ExecuteQuery<T>(string query, object[] parameters, Func<DbDataReader, T> map)
+    {
+        lock (Connection)
+        {
+            EnsureConnected();
+            EnsureDbReaderIsClosed();
+
+            using var command = Connection.CreateCommand();
+            command.CommandText = query;
+            command.Parameters.AddRange(parameters);
+
+            using var reader = command.ExecuteReader();
+
+            while (reader.Read())
+            {
+                map(reader);
+            }
+
+            return;
+        }
+    }
+
+    public int ExecuteSQLNonQuery(string query, object[] parameters)
+    {
+        lock (Connection)
+        {
+            EnsureConnected();
+            EnsureDbReaderIsClosed();
+            using DbCommand command = Connection.CreateCommand();
+
+            command.CommandText = query;
+            command.Parameters.AddRange(parameters);
+            return command.ExecuteNonQuery();
+        }
+    }
+
+    public abstract int ExecuteSQLCommandGetInsertedID(string query, object[] parameters);
+
+    public bool EnsureConnected()
+    {
+        if (Connection.State != System.Data.ConnectionState.Open)
+        {
+            try
+            {
+                Connection.Close();
+                Connection.Open();
+            }
+            catch (Exception ex)
+            {
+                ElmahCore.ElmahExtensions.RaiseError(ex);
+                throw;
+            }
+        }
+        return true;
+    }
+
+    public void EnsureDbReaderIsClosed()
+    {
+        int counter = 0;
+        int sleepTime = 10;
+        int timeout = 5000;
+        while (!(DbDataReader?.IsClosed ?? true))
+        {
+            if (counter > timeout / sleepTime)
+            {
+                TimeoutException ex = new("Unable to ensure dbDataReader is closed");
+                ElmahCore.ElmahExtensions.RaiseError(ex);
+                throw ex;
+            }
+            Thread.Sleep(sleepTime);
+        }
+    }
+}

src/Server/Probmethods.cs

@@ -6,34 +6,29 @@ namespace Server;
 
 public class ProbMethod
 {
-    public Probmethods.probMethodDelegate method;
-    public ProbMethodEnum probMethodEnum;
-    public string name;
+    public Probmethods.ProbMethodDelegate Method;
+    public ProbMethodEnum ProbMethodEnum;
+    public string Name;
 
-    public ProbMethod(ProbMethodEnum probMethodEnum, ILogger logger)
+    public ProbMethod(ProbMethodEnum probMethodEnum)
     {
-        this.probMethodEnum = probMethodEnum;
-        this.name = probMethodEnum.ToString();
-        Probmethods.probMethodDelegate? probMethod = Probmethods.GetMethod(name);
-        if (probMethod is null)
-        {
-            logger.LogError("Unable to retrieve probMethod {name}", [name]);
-            throw new ProbMethodNotFoundException(probMethodEnum);
-        }
-        method = probMethod;
+        this.ProbMethodEnum = probMethodEnum;
+        this.Name = probMethodEnum.ToString();
+        Probmethods.ProbMethodDelegate? probMethod = Probmethods.GetMethod(Name) ?? throw new ProbMethodNotFoundException(probMethodEnum);
+        Method = probMethod;
     }
 }
 
 
 public static class Probmethods
 {
-    public delegate float probMethodProtoDelegate(List<(string, float)> list, string parameters);
-    public delegate float probMethodDelegate(List<(string, float)> list);
-    public static readonly Dictionary<ProbMethodEnum, probMethodProtoDelegate> probMethods;
+    public delegate float ProbMethodProtoDelegate(List<(string, float)> list, string parameters);
+    public delegate float ProbMethodDelegate(List<(string, float)> list);
+    public static readonly Dictionary<ProbMethodEnum, ProbMethodProtoDelegate> ProbMethods;
 
     static Probmethods()
     {
-        probMethods = new Dictionary<ProbMethodEnum, probMethodProtoDelegate>
+        ProbMethods = new Dictionary<ProbMethodEnum, ProbMethodProtoDelegate>
         {
             [ProbMethodEnum.Mean] = Mean,
             [ProbMethodEnum.HarmonicMean] = HarmonicMean,
@@ -46,12 +41,12 @@ public static class Probmethods
         };
     }
 
-    public static probMethodDelegate? GetMethod(ProbMethodEnum probMethodEnum)
+    public static ProbMethodDelegate? GetMethod(ProbMethodEnum probMethodEnum)
     {
         return GetMethod(probMethodEnum.ToString());
     }
 
-    public static probMethodDelegate? GetMethod(string name)
+    public static ProbMethodDelegate? GetMethod(string name)
     {
         string methodName = name;
         string? jsonArg = "";
@@ -68,7 +63,7 @@ public static class Probmethods
             methodName
         );
 
-        if (!probMethods.TryGetValue(probMethodEnum, out probMethodProtoDelegate? method))
+        if (!ProbMethods.TryGetValue(probMethodEnum, out ProbMethodProtoDelegate? method))
         {
             return null;
         }

src/Server/Program.cs

@@ -9,13 +9,14 @@ using Server.Helper;
 using Server.Models;
 using Server.Services;
 using System.Text.Json.Serialization;
-using System.Reflection;
 using System.Configuration;
-using Microsoft.OpenApi.Models;
+using Microsoft.OpenApi;
 using Shared.Models;
 using Microsoft.AspNetCore.ResponseCompression;
 using System.Net;
 using System.Text;
+using Server.Migrations;
+using Microsoft.Data.Sqlite;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -31,10 +32,28 @@ builder.Services.AddControllersWithViews()
 // Add Configuration
 IConfigurationSection configurationSection = builder.Configuration.GetSection("Embeddingsearch");
 EmbeddingSearchOptions configuration = configurationSection.Get<EmbeddingSearchOptions>() ?? throw new ConfigurationErrorsException("Unable to start server due to an invalid configration");
-
 builder.Services.Configure<EmbeddingSearchOptions>(configurationSection);
 builder.Services.Configure<ApiKeyOptions>(configurationSection);
 
+// Configure Kestrel
+builder.WebHost.ConfigureKestrel(options =>
+{
+    options.Limits.MaxRequestBodySize = configuration.MaxRequestBodySize ?? 50 * 1024 * 1024;
+});
+
+// Migrate database
+SQLHelper helper = new(new MySql.Data.MySqlClient.MySqlConnection(configuration.ConnectionStrings.SQL), configuration.ConnectionStrings.SQL);
+DatabaseMigrations.Migrate(helper);
+
+// Migrate SQLite cache
+if (configuration.ConnectionStrings.Cache is not null)
+{
+
+    var SqliteConnection = new SqliteConnection(configuration.ConnectionStrings.Cache);
+    SqliteConnection.Open();
+    SQLiteMigrations.Migrate(SqliteConnection);
+}
+
 // Add Localization
 builder.Services.AddLocalization(options => options.ResourcesPath = "Resources");
 builder.Services.Configure<RequestLocalizationOptions>(options =>
@@ -50,36 +69,37 @@ builder.Services.AddScoped<LocalizationService>();
 
 // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
 builder.Services.AddEndpointsApiExplorer();
-builder.Services.AddSwaggerGen(c =>
+builder.Services.AddOpenApi(options =>
 {
-    var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
-    var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
-    c.IncludeXmlComments(xmlPath);
-    if (configuration.ApiKeys is not null)
+    options.AddDocumentTransformer((document, context, _) =>
     {
-        c.AddSecurityDefinition("ApiKey", new OpenApiSecurityScheme
-        {
-            Description = "ApiKey must appear in header",
-            Type = SecuritySchemeType.ApiKey,
-            Name = "X-API-KEY",
-            In = ParameterLocation.Header,
-            Scheme = "ApiKeyScheme"
-        });
-        var key = new OpenApiSecurityScheme()
-        {
-            Reference = new OpenApiReference
+        if (configuration.ApiKeys is null)
+            return Task.CompletedTask;
+
+        document.Components ??= new();
+        document.Components.SecuritySchemes ??= new Dictionary<string, IOpenApiSecurityScheme>();
+
+        document.Components.SecuritySchemes["ApiKey"] =
+            new OpenApiSecurityScheme
             {
-                Type = ReferenceType.SecurityScheme,
-                Id = "ApiKey"
-            },
-            In = ParameterLocation.Header
-        };
-        var requirement = new OpenApiSecurityRequirement
-        {
-            { key, []}
-        };
-        c.AddSecurityRequirement(requirement);
-    }
+                Type = SecuritySchemeType.ApiKey,
+                Name = "X-API-KEY",
+                In = ParameterLocation.Header,
+                Description = "ApiKey must appear in header"
+            };
+        
+        document.Security ??= [];
+
+        // Apply globally
+        document.Security?.Add(
+            new OpenApiSecurityRequirement
+            {
+                [new OpenApiSecuritySchemeReference("ApiKey", document)] = []
+            }
+        );
+
+        return Task.CompletedTask;
+    });
 });
 Log.Logger = new LoggerConfiguration()
     .ReadFrom.Configuration(builder.Configuration)
@@ -228,13 +248,16 @@ app.Use(async (context, next) =>
     await next();
 });
 
-app.UseSwagger();
 app.UseSwaggerUI(options =>
 {
+    options.SwaggerEndpoint("/openapi/v1.json", "API v1");
+    options.RoutePrefix = "swagger";
     options.EnablePersistAuthorization();
     options.InjectStylesheet("/swagger-ui/custom.css");
     options.InjectJavascript("/swagger-ui/custom.js");
 });
+app.MapOpenApi("/openapi/v1.json");
+
 //app.UseElmahExceptionPage(); // Messes with JSON response for API calls. Leaving this here so I don't accidentally put this in again later on.
 
 if (configuration.ApiKeys is not null)

src/Server/Resources/SharedResources.de.resx

@@ -300,4 +300,40 @@
   <data name="Unable to fetch searchdomain database utilization" xml:space="preserve">
     <value>Searchdomain Datenbank-Auslastung konnte nicht abgerufen werden</value>
   </data>
+  <data name="Query cache entry count" xml:space="preserve">
+    <value>Query-Cache Einträge</value>
+  </data>
+  <data name="Query cache capacity (all)" xml:space="preserve">
+    <value>Query-Cache Kapazität (alle)</value>
+  </data>
+  <data name="queryCacheEntryCountAllInfo" xml:space="preserve">
+    <value>Anzahl der Einträge, die insgesamt in den Query-Cache passen. Ungeladene Searchdomains werden berücksichtigt.</value>
+  </data>
+  <data name="Query cache capacity (loaded)" xml:space="preserve">
+    <value>Query-Cache Kapazität (geladen)</value>
+  </data>
+  <data name="queryCacheEntryCountLoadedInfo" xml:space="preserve">
+    <value>Anzahl der Einträge, die insgesamt in den Query-Cache der geladenen Searchdomains passen.</value>
+  </data>
+  <data name="Query cache size" xml:space="preserve">
+    <value>Query Cache Größe</value>
+  </data>
+  <data name="Embeddings parallel prefetching" xml:space="preserve">
+    <value>Embeddings parallel prefetchen</value>
+  </data>
+  <data name="parallelEmbeddingsPrefetchInfo" xml:space="preserve">
+    <value>Wenn diese Einstellung aktiv ist, wird das Abrufen von Embeddings beim Indizieren von Entities parallelisiert. Deaktiviere diese Einstellung, falls Model-unloading ein Problem ist.</value>
+  </data>
+  <data name="Add result" xml:space="preserve">
+    <value>Ergebnis hinzufügen</value>
+  </data>
+  <data name="Search query was updated successfully" xml:space="preserve">
+    <value>Suchanfrage wurde erfolgreich angepasst</value>
+  </data>
+  <data name="Total RAM usage" xml:space="preserve">
+    <value>RAM Verwendung insgesamt</value>
+  </data>
+  <data name="Total Database size" xml:space="preserve">
+    <value>Datenbankgröße insgesamt</value>
+  </data>
 </root>

src/Server/Resources/SharedResources.en.resx

@@ -300,4 +300,40 @@
   <data name="Unable to fetch searchdomain database utilization" xml:space="preserve">
     <value>Unable to fetch searchdomain database utilization</value>
   </data>
+  <data name="Query cache entry count" xml:space="preserve">
+    <value>Query cache entry count</value>
+  </data>
+  <data name="Query cache capacity (all)" xml:space="preserve">
+    <value>Query cache capacity (all)</value>
+  </data>
+  <data name="queryCacheEntryCountAllInfo" xml:space="preserve">
+    <value>Number of query cache entries that can be stored in the query cache, including searchdomains that are currently not loaded.</value>
+  </data>
+  <data name="Query cache capacity (loaded)" xml:space="preserve">
+    <value>Query cache capacity (loaded)</value>
+  </data>
+  <data name="queryCacheEntryCountLoadedInfo" xml:space="preserve">
+    <value>Number of query cache entries that can be stored in the query cache of all loaded searchdomains.</value>
+  </data>
+  <data name="Query cache size" xml:space="preserve">
+    <value>Query Cache size</value>
+  </data>
+  <data name="Embeddings parallel prefetching" xml:space="preserve">
+    <value>Embeddings parallel prefetching</value>
+  </data>
+  <data name="parallelEmbeddingsPrefetchInfo" xml:space="preserve">
+    <value>With this setting activated the embeddings retrieval will be parallelized when indexing entities. Disable this setting if model unloading is an issue.</value>
+  </data>
+  <data name="Add result" xml:space="preserve">
+    <value>Add result</value>
+  </data>
+  <data name="Search query was updated successfully" xml:space="preserve">
+    <value>Search query was updated successfully</value>
+  </data>
+  <data name="Total RAM usage" xml:space="preserve">
+    <value>Total RAM usage</value>
+  </data>
+  <data name="Total Database size" xml:space="preserve">
+    <value>Total Database size</value>
+  </data>
 </root>

src/Server/Searchdomain.cs

@@ -4,8 +4,10 @@ using System.Text.Json;
 using ElmahCore.Mvc.Logger;
 using MySql.Data.MySqlClient;
 using Server.Helper;
+using Shared;
 using Shared.Models;
 using AdaptiveExpressions;
+using System.Collections.Concurrent;
 
 namespace Server;
 
@@ -13,36 +15,33 @@ public class Searchdomain
 {
     private readonly string _connectionString;
     private readonly string _provider;
-    public AIProvider aIProvider;
-    public string searchdomain;
-    public int id;
-    public SearchdomainSettings settings;
-    public Dictionary<string, DateTimedSearchResult> searchCache; // Key: query, Value: Search results for that query (with timestamp)
-    public List<Entity> entityCache;
-    public List<string> modelsInUse;
-    public LRUCache<string, Dictionary<string, float[]>> embeddingCache;
-    private readonly MySqlConnection connection;
-    public SQLHelper helper;
+    public AIProvider AiProvider;
+    public string SearchdomainName;
+    public int Id;
+    public SearchdomainSettings Settings;
+    public EnumerableLruCache<string, DateTimedSearchResult> QueryCache; // Key: query, Value: Search results for that query (with timestamp)
+    public ConcurrentDictionary<string, Entity> EntityCache;
+    public ConcurrentBag<string> ModelsInUse;
+    public EnumerableLruCache<string, Dictionary<string, float[]>> EmbeddingCache;
+    public SQLHelper Helper;
     private readonly ILogger _logger;
 
-    public Searchdomain(string searchdomain, string connectionString, AIProvider aIProvider, LRUCache<string, Dictionary<string, float[]>> embeddingCache, ILogger logger, string provider = "sqlserver", bool runEmpty = false)
+    public Searchdomain(string searchdomain, string connectionString, SQLHelper sqlHelper, AIProvider aIProvider, EnumerableLruCache<string, Dictionary<string, float[]>> embeddingCache, ILogger logger, string provider = "sqlserver", bool runEmpty = false)
     {
         _connectionString = connectionString;
         _provider = provider.ToLower();
-        this.searchdomain = searchdomain;
-        this.aIProvider = aIProvider;
-        this.embeddingCache = embeddingCache;
+        this.SearchdomainName = searchdomain;
+        this.AiProvider = aIProvider;
+        this.EmbeddingCache = embeddingCache;
         this._logger = logger;
-        searchCache = [];
-        entityCache = [];
-        connection = new MySqlConnection(connectionString);
-        connection.Open();
-        helper = new SQLHelper(connection, connectionString);
-        settings = GetSettings();
-        modelsInUse = []; // To make the compiler shut up - it is set in UpdateSearchDomain() don't worry // yeah, about that...
+        EntityCache = [];
+        Helper = sqlHelper;
+        Settings = GetSettings();
+        QueryCache = new(Settings.QueryCacheSize);
+        ModelsInUse = []; // To make the compiler shut up - it is set in UpdateSearchDomain() don't worry // yeah, about that...
         if (!runEmpty)
         {
-            GetID();
+            Id = GetID().Result;
             UpdateEntityCache();
         }
     }
@@ -52,118 +51,138 @@ public class Searchdomain
         InvalidateSearchCache();
         Dictionary<string, dynamic> parametersIDSearchdomain = new()
         {
-            ["id"] = this.id
+            ["id"] = this.Id
         };
-        DbDataReader embeddingReader = helper.ExecuteSQLCommand("SELECT e.id, e.id_datapoint, e.model, e.embedding FROM embedding e JOIN datapoint d ON e.id_datapoint = d.id JOIN entity ent ON d.id_entity = ent.id JOIN searchdomain s ON ent.id_searchdomain = s.id WHERE s.id = @id", parametersIDSearchdomain);
+        DbDataReader embeddingReader = Helper.ExecuteSQLCommand("SELECT id, id_datapoint, model, embedding FROM embedding WHERE id_searchdomain = @id", parametersIDSearchdomain);
         Dictionary<int, Dictionary<string, float[]>> embedding_unassigned = [];
-        while (embeddingReader.Read())
+        try
         {
-            int? id_datapoint_debug = null;
-            try
+            while (embeddingReader.Read())
             {
-                int id_datapoint = embeddingReader.GetInt32(1);
-                id_datapoint_debug = id_datapoint;
-                string model = embeddingReader.GetString(2);
-                long length = embeddingReader.GetBytes(3, 0, null, 0, 0);
-                byte[] embedding = new byte[length];
-                embeddingReader.GetBytes(3, 0, embedding, 0, (int) length);
-                if (embedding_unassigned.TryGetValue(id_datapoint, out Dictionary<string, float[]>? embedding_unassigned_id_datapoint))
+                int? id_datapoint_debug = null;
+                try
                 {
-                    embedding_unassigned[id_datapoint][model] = SearchdomainHelper.FloatArrayFromBytes(embedding);
-                }
-                else
-                {
-                    embedding_unassigned[id_datapoint] = new()
+                    int id_datapoint = embeddingReader.GetInt32(1);
+                    id_datapoint_debug = id_datapoint;
+                    string model = embeddingReader.GetString(2);
+                    long length = embeddingReader.GetBytes(3, 0, null, 0, 0);
+                    byte[] embedding = new byte[length];
+                    embeddingReader.GetBytes(3, 0, embedding, 0, (int) length);
+                    if (embedding_unassigned.TryGetValue(id_datapoint, out Dictionary<string, float[]>? embedding_unassigned_id_datapoint))
                     {
-                        [model] = SearchdomainHelper.FloatArrayFromBytes(embedding)
-                    };
-                }
-            } catch (Exception e)
-            {
-                _logger.LogError("Error reading embedding (id: {id_datapoint}) from database: {e.Message} - {e.StackTrace}", [id_datapoint_debug, e.Message, e.StackTrace]);
-                ElmahCore.ElmahExtensions.RaiseError(e);
-            }
-        }
-        embeddingReader.Close();
-
-        DbDataReader datapointReader = helper.ExecuteSQLCommand("SELECT d.id, d.id_entity, d.name, d.probmethod_embedding, d.similaritymethod, d.hash FROM datapoint d JOIN entity ent ON d.id_entity = ent.id JOIN searchdomain s ON ent.id_searchdomain = s.id WHERE s.id = @id", parametersIDSearchdomain);
-        Dictionary<int, List<Datapoint>> datapoint_unassigned = [];
-        while (datapointReader.Read())
-        {
-            int id = datapointReader.GetInt32(0);
-            int id_entity = datapointReader.GetInt32(1);
-            string name = datapointReader.GetString(2);
-            string probmethodString = datapointReader.GetString(3);
-            string similarityMethodString = datapointReader.GetString(4);
-            string hash = datapointReader.GetString(5);
-            ProbMethodEnum probmethodEnum = (ProbMethodEnum)Enum.Parse(
-                typeof(ProbMethodEnum),
-                probmethodString
-            );
-            SimilarityMethodEnum similairtyMethodEnum = (SimilarityMethodEnum)Enum.Parse(
-                typeof(SimilarityMethodEnum),
-                similarityMethodString
-            );
-            ProbMethod probmethod = new(probmethodEnum, _logger);
-            SimilarityMethod similarityMethod = new(similairtyMethodEnum, _logger);
-            if (embedding_unassigned.TryGetValue(id, out Dictionary<string, float[]>? embeddings) && probmethod is not null)
-            {
-                embedding_unassigned.Remove(id);
-                if (!datapoint_unassigned.ContainsKey(id_entity))
+                        embedding_unassigned[id_datapoint][model] = SearchdomainHelper.FloatArrayFromBytes(embedding);
+                    }
+                    else
+                    {
+                        embedding_unassigned[id_datapoint] = new()
+                        {
+                            [model] = SearchdomainHelper.FloatArrayFromBytes(embedding)
+                        };
+                    }
+                } catch (Exception e)
                 {
-                    datapoint_unassigned[id_entity] = [];
+                    _logger.LogError("Error reading embedding (id: {id_datapoint}) from database: {e.Message} - {e.StackTrace}", [id_datapoint_debug, e.Message, e.StackTrace]);
+                    ElmahCore.ElmahExtensions.RaiseError(e);
                 }
-                datapoint_unassigned[id_entity].Add(new Datapoint(name, probmethod, similarityMethod, hash, [.. embeddings.Select(kv => (kv.Key, kv.Value))]));
             }
+        } finally
+        {
+            embeddingReader.Close();
         }
-        datapointReader.Close();
 
-        DbDataReader attributeReader = helper.ExecuteSQLCommand("SELECT a.id, a.id_entity, a.attribute, a.value FROM attribute a JOIN entity ent ON a.id_entity = ent.id JOIN searchdomain s ON ent.id_searchdomain = s.id WHERE s.id = @id", parametersIDSearchdomain);
+        DbDataReader datapointReader = Helper.ExecuteSQLCommand("SELECT d.id, d.id_entity, d.name, d.probmethod_embedding, d.similaritymethod, d.hash FROM datapoint d JOIN entity ent ON d.id_entity = ent.id JOIN searchdomain s ON ent.id_searchdomain = s.id WHERE s.id = @id", parametersIDSearchdomain);
+        Dictionary<int, ConcurrentBag<Datapoint>> datapoint_unassigned = [];
+        try
+        {
+            while (datapointReader.Read())
+            {
+                int id = datapointReader.GetInt32(0);
+                int id_entity = datapointReader.GetInt32(1);
+                string name = datapointReader.GetString(2);
+                string probmethodString = datapointReader.GetString(3);
+                string similarityMethodString = datapointReader.GetString(4);
+                string hash = datapointReader.GetString(5);
+                ProbMethodEnum probmethodEnum = (ProbMethodEnum)Enum.Parse(
+                    typeof(ProbMethodEnum),
+                    probmethodString
+                );
+                SimilarityMethodEnum similairtyMethodEnum = (SimilarityMethodEnum)Enum.Parse(
+                    typeof(SimilarityMethodEnum),
+                    similarityMethodString
+                );
+                ProbMethod probmethod = new(probmethodEnum);
+                SimilarityMethod similarityMethod = new(similairtyMethodEnum);
+                if (embedding_unassigned.TryGetValue(id, out Dictionary<string, float[]>? embeddings) && probmethod is not null)
+                {
+                    embedding_unassigned.Remove(id);
+                    if (!datapoint_unassigned.ContainsKey(id_entity))
+                    {
+                        datapoint_unassigned[id_entity] = [];
+                    }
+                    datapoint_unassigned[id_entity].Add(new Datapoint(name, probmethod, similarityMethod, hash, [.. embeddings.Select(kv => (kv.Key, kv.Value))], id));
+                }
+            }
+        } finally
+        {
+            datapointReader.Close();
+        }
+
+        DbDataReader attributeReader = Helper.ExecuteSQLCommand("SELECT a.id, a.id_entity, a.attribute, a.value FROM attribute a JOIN entity ent ON a.id_entity = ent.id JOIN searchdomain s ON ent.id_searchdomain = s.id WHERE s.id = @id", parametersIDSearchdomain);
         Dictionary<int, Dictionary<string, string>> attributes_unassigned = [];
-        while (attributeReader.Read())
+        try
         {
-            //"SELECT id, id_entity, attribute, value FROM attribute JOIN entity on attribute.id_entity as en JOIN searchdomain on en.id_searchdomain as sd WHERE sd=@id"
-            int id = attributeReader.GetInt32(0);
-            int id_entity = attributeReader.GetInt32(1);
-            string attribute = attributeReader.GetString(2);
-            string value = attributeReader.GetString(3);
-            if (!attributes_unassigned.ContainsKey(id_entity))
+            while (attributeReader.Read())
             {
-                attributes_unassigned[id_entity] = [];
-            }
-            attributes_unassigned[id_entity].Add(attribute, value);
-        }
-        attributeReader.Close();
-
-        entityCache = [];
-        DbDataReader entityReader = helper.ExecuteSQLCommand("SELECT entity.id, name, probmethod FROM entity WHERE id_searchdomain=@id", parametersIDSearchdomain);
-        while (entityReader.Read())
-        {
-            //SELECT id, name, probmethod FROM entity WHERE id_searchdomain=@id
-            int id = entityReader.GetInt32(0);
-            string name = entityReader.GetString(1);
-            string probmethodString = entityReader.GetString(2);
-            if (!attributes_unassigned.TryGetValue(id, out Dictionary<string, string>? attributes))
-            {
-                attributes = [];
-            }
-            Probmethods.probMethodDelegate? probmethod = Probmethods.GetMethod(probmethodString);
-            if (datapoint_unassigned.TryGetValue(id, out List<Datapoint>? datapoints) && probmethod is not null)
-            {
-                Entity entity = new(attributes, probmethod, probmethodString, datapoints, name)
+                //"SELECT id, id_entity, attribute, value FROM attribute JOIN entity on attribute.id_entity as en JOIN searchdomain on en.id_searchdomain as sd WHERE sd=@id"
+                int id = attributeReader.GetInt32(0);
+                int id_entity = attributeReader.GetInt32(1);
+                string attribute = attributeReader.GetString(2);
+                string value = attributeReader.GetString(3);
+                if (!attributes_unassigned.ContainsKey(id_entity))
                 {
-                    id = id
-                };
-                entityCache.Add(entity);
+                    attributes_unassigned[id_entity] = [];
+                }
+                attributes_unassigned[id_entity].Add(attribute, value);
             }
+        } finally
+        {
+            attributeReader.Close();
         }
-        entityReader.Close();
-        modelsInUse = GetModels(entityCache);
+
+        EntityCache = [];
+        DbDataReader entityReader = Helper.ExecuteSQLCommand("SELECT entity.id, name, probmethod FROM entity WHERE id_searchdomain=@id", parametersIDSearchdomain);
+        try
+        {
+            while (entityReader.Read())
+            {
+                //SELECT id, name, probmethod FROM entity WHERE id_searchdomain=@id
+                int id = entityReader.GetInt32(0);
+                string name = entityReader.GetString(1);
+                string probmethodString = entityReader.GetString(2);
+                if (!attributes_unassigned.TryGetValue(id, out Dictionary<string, string>? attributes))
+                {
+                    attributes = [];
+                }
+                Probmethods.ProbMethodDelegate? probmethod = Probmethods.GetMethod(probmethodString);
+                if (datapoint_unassigned.TryGetValue(id, out ConcurrentBag<Datapoint>? datapoints) && probmethod is not null)
+                {
+                    Entity entity = new(attributes, probmethod, probmethodString, datapoints, name, SearchdomainName)
+                    {
+                        Id = id
+                    };
+                    EntityCache[name] = entity;
+                }
+            }
+        } finally
+        {
+            entityReader.Close();
+        }
+        ModelsInUse = GetModels(EntityCache);
     }
 
     public List<(float, string)> Search(string query, int? topN = null)
     {
-        if (searchCache.TryGetValue(query, out DateTimedSearchResult cachedResult))
+        if (QueryCache.TryGetValue(query, out DateTimedSearchResult cachedResult))
         {
             cachedResult.AccessDateTimes.Add(DateTime.Now);
             return [.. cachedResult.Results.Select(r => (r.Score, r.Name))];
@@ -172,10 +191,9 @@ public class Searchdomain
         Dictionary<string, float[]> queryEmbeddings = GetQueryEmbeddings(query);
 
         List<(float, string)> result = [];
-
-        foreach (Entity entity in entityCache)
+        foreach ((string name, Entity entity) in EntityCache)
         {
-            result.Add((EvaluateEntityAgainstQueryEmbeddings(entity, queryEmbeddings), entity.name));
+            result.Add((EvaluateEntityAgainstQueryEmbeddings(entity, queryEmbeddings), entity.Name));
         }
         IEnumerable<(float, string)> sortedResults = result.OrderByDescending(s => s.Item1);
         if (topN is not null)
@@ -187,26 +205,26 @@ public class Searchdomain
             [.. sortedResults.Select(r =>
                 new ResultItem(r.Item1, r.Item2 ))]
         );
-        searchCache[query] = new DateTimedSearchResult(DateTime.Now, searchResult);
+        QueryCache.Set(query, new DateTimedSearchResult(DateTime.Now, searchResult));
         return results;
     }
 
     public Dictionary<string, float[]> GetQueryEmbeddings(string query)
     {
-        bool hasQuery = embeddingCache.TryGet(query, out Dictionary<string, float[]> queryEmbeddings);
-        bool allModelsInQuery = queryEmbeddings is not null && modelsInUse.All(model => queryEmbeddings.ContainsKey(model));
+        bool hasQuery = EmbeddingCache.TryGetValue(query, out Dictionary<string, float[]>? queryEmbeddings);
+        bool allModelsInQuery = queryEmbeddings is not null && ModelsInUse.All(model => queryEmbeddings.ContainsKey(model));
         if (!(hasQuery && allModelsInQuery) || queryEmbeddings is null)
         {
-            queryEmbeddings = Datapoint.GenerateEmbeddings(query, modelsInUse, aIProvider, embeddingCache);
-            if (!embeddingCache.TryGet(query, out var embeddingCacheForCurrentQuery))
+            queryEmbeddings = Datapoint.GetEmbeddings(query, ModelsInUse, AiProvider, EmbeddingCache);
+            if (!EmbeddingCache.TryGetValue(query, out var embeddingCacheForCurrentQuery))
             {
-                embeddingCache.Set(query, queryEmbeddings);
+                EmbeddingCache.Set(query, queryEmbeddings);
             }
             else // embeddingCache already has an entry for this query, so the missing model-embedding pairs have to be filled in
             {
                 foreach (KeyValuePair<string, float[]> kvp in queryEmbeddings) // kvp.Key = model, kvp.Value = embedding
                 {
-                    if (!embeddingCache.TryGet(kvp.Key, out var _))
+                    if (!EmbeddingCache.TryGetValue(kvp.Key, out var _))
                     {
                         embeddingCacheForCurrentQuery[kvp.Key] = kvp.Value;
                     }
@@ -218,37 +236,38 @@ public class Searchdomain
 
     public void UpdateModelsInUse()
     {
-        modelsInUse = GetModels([.. entityCache]);
+        ModelsInUse = GetModels(EntityCache);
     }
 
     private static float EvaluateEntityAgainstQueryEmbeddings(Entity entity, Dictionary<string, float[]> queryEmbeddings)
     {
         List<(string, float)> datapointProbs = [];
-        foreach (Datapoint datapoint in entity.datapoints)
+        foreach (Datapoint datapoint in entity.Datapoints)
         {
-            SimilarityMethod similarityMethod = datapoint.similarityMethod;
+            SimilarityMethod similarityMethod = datapoint.SimilarityMethod;
             List<(string, float)> list = [];
-            foreach ((string, float[]) embedding in datapoint.embeddings)
+            foreach ((string, float[]) embedding in datapoint.Embeddings)
             {
                 string key = embedding.Item1;
-                float value = similarityMethod.method(queryEmbeddings[embedding.Item1], embedding.Item2);
+                float value = similarityMethod.Method(queryEmbeddings[embedding.Item1], embedding.Item2);
                 list.Add((key, value));
             }
-            datapointProbs.Add((datapoint.name, datapoint.probMethod.method(list)));
+            datapointProbs.Add((datapoint.Name, datapoint.ProbMethod.Method(list)));
         }
-        return entity.probMethod(datapointProbs);
+        return entity.ProbMethod(datapointProbs);
     }
 
-    public static List<string> GetModels(List<Entity> entities)
+    public static ConcurrentBag<string> GetModels(ConcurrentDictionary<string, Entity> entities)
     {
-        List<string> result = [];
-        lock (entities)
+        ConcurrentBag<string> result = [];
+        foreach (KeyValuePair<string, Entity> element in entities)
         {
-            foreach (Entity entity in entities)
+            Entity entity = element.Value;
+            lock (entity)
             {
-                foreach (Datapoint datapoint in entity.datapoints)
+                foreach (Datapoint datapoint in entity.Datapoints)
                 {
-                    foreach ((string, float[]) tuple in datapoint.embeddings)
+                    foreach ((string, float[]) tuple in datapoint.Embeddings)
                     {
                         string model = tuple.Item1;
                         if (!result.Contains(model))
@@ -262,37 +281,25 @@ public class Searchdomain
         return result;
     }
 
-    public int GetID()
+    public async Task<int> GetID()
     {
-        Dictionary<string, dynamic> parameters = new()
+        Dictionary<string, object?> parameters = new()
         {
-            ["name"] = this.searchdomain
+            { "name", this.SearchdomainName }
         };
-        DbDataReader reader = helper.ExecuteSQLCommand("SELECT id from searchdomain WHERE name = @name", parameters);
-        reader.Read();
-        this.id = reader.GetInt32(0);
-        reader.Close();
-        return this.id;
+        return (await Helper.ExecuteQueryAsync("SELECT id from searchdomain WHERE name = @name", parameters, x => x.GetInt32(0))).First();
     }
 
     public SearchdomainSettings GetSettings()
     {
-        Dictionary<string, dynamic> parameters = new()
-        {
-            ["name"] = searchdomain
-        };
-        DbDataReader reader = helper.ExecuteSQLCommand("SELECT settings from searchdomain WHERE name = @name", parameters);
-        reader.Read();
-        string settingsString = reader.GetString(0);
-        reader.Close();
-        return JsonSerializer.Deserialize<SearchdomainSettings>(settingsString);
+        return DatabaseHelper.GetSearchdomainSettings(Helper, SearchdomainName);
     }
 
     public void ReconciliateOrInvalidateCacheForNewOrUpdatedEntity(Entity entity)
     {
-        if (settings.CacheReconciliation)
+        if (Settings.CacheReconciliation)
         {
-            foreach (KeyValuePair<string, DateTimedSearchResult> element in searchCache)
+            foreach (var element in QueryCache)
             {
                 string query = element.Key;
                 DateTimedSearchResult searchResult = element.Value;
@@ -300,9 +307,9 @@ public class Searchdomain
                 Dictionary<string, float[]> queryEmbeddings = GetQueryEmbeddings(query);
                 float evaluationResult = EvaluateEntityAgainstQueryEmbeddings(entity, queryEmbeddings);
 
-                searchResult.Results.RemoveAll(x => x.Name == entity.name); // If entity already exists in that results list: remove it.
+                searchResult.Results.RemoveAll(x => x.Name == entity.Name); // If entity already exists in that results list: remove it.
 
-                ResultItem newItem = new(evaluationResult, entity.name);
+                ResultItem newItem = new(evaluationResult, entity.Name);
                 int index = searchResult.Results.BinarySearch(
                     newItem,
                     Comparer<ResultItem>.Create((a, b) => b.Score.CompareTo(a.Score)) // Invert searching order
@@ -320,13 +327,13 @@ public class Searchdomain
 
     public void ReconciliateOrInvalidateCacheForDeletedEntity(Entity entity)
     {
-        if (settings.CacheReconciliation)
+        if (Settings.CacheReconciliation)
         {
-            foreach (KeyValuePair<string, DateTimedSearchResult> element in searchCache)
+            foreach (KeyValuePair<string, DateTimedSearchResult> element in QueryCache)
             {
                 string query = element.Key;
                 DateTimedSearchResult searchResult = element.Value;
-                searchResult.Results.RemoveAll(x => x.Name == entity.name);
+                searchResult.Results.RemoveAll(x => x.Name == entity.Name);
             }
         }
         else
@@ -337,18 +344,18 @@ public class Searchdomain
 
     public void InvalidateSearchCache()
     {
-        searchCache = [];
+        QueryCache = new(Settings.QueryCacheSize);
     }
 
     public long GetSearchCacheSize()
     {
-        long sizeInBytes = 0;
-        foreach (var entry in searchCache)
+        long EmbeddingCacheUtilization = 0;
+        foreach (var entry in QueryCache)
         {
-            sizeInBytes += sizeof(int); // string length prefix
-            sizeInBytes += entry.Key.Length * sizeof(char); // string characters
-            sizeInBytes += entry.Value.EstimateSize();
+            EmbeddingCacheUtilization += sizeof(int); // string length prefix
+            EmbeddingCacheUtilization += entry.Key.Length * sizeof(char); // string characters
+            EmbeddingCacheUtilization += entry.Value.EstimateSize();
         }
-        return sizeInBytes;
+        return EmbeddingCacheUtilization;
     }
 }

src/Server/SearchdomainManager.cs

@@ -8,54 +8,57 @@ using Shared.Models;
 using System.Text.Json;
 using Microsoft.Extensions.Options;
 using Server.Models;
+using Shared;
+using System.Diagnostics;
 
 namespace Server;
 
-public class SearchdomainManager
+public class SearchdomainManager : IDisposable
 {
-    private Dictionary<string, Searchdomain> searchdomains = [];
+    private Dictionary<string, Searchdomain> _searchdomains = [];
     private readonly ILogger<SearchdomainManager> _logger;
     private readonly EmbeddingSearchOptions _options;
-    public readonly AIProvider aIProvider;
+    public readonly AIProvider AiProvider;
     private readonly DatabaseHelper _databaseHelper;
     private readonly string connectionString;
-    private MySqlConnection connection;
-    public SQLHelper helper;
-    public LRUCache<string, Dictionary<string, float[]>> embeddingCache;
+    private MySqlConnection _connection;
+    public SQLHelper Helper;
+    public EnumerableLruCache<string, Dictionary<string, float[]>> EmbeddingCache;
     public long EmbeddingCacheMaxCount;
+    private bool _disposed = false;
 
     public SearchdomainManager(ILogger<SearchdomainManager> logger, IOptions<EmbeddingSearchOptions> options, AIProvider aIProvider, DatabaseHelper databaseHelper)
     {
         _logger = logger;
         _options = options.Value;
-        this.aIProvider = aIProvider;
+        this.AiProvider = aIProvider;
         _databaseHelper = databaseHelper;
-        EmbeddingCacheMaxCount = _options.EmbeddingCacheMaxCount;
-        embeddingCache = new((int)EmbeddingCacheMaxCount);
+        EmbeddingCacheMaxCount = _options.Cache.CacheTopN;
+        if (options.Value.Cache.StoreEmbeddingCache)
+        {
+            var stopwatch = Stopwatch.StartNew();
+            EmbeddingCache = CacheHelper.GetEmbeddingStore(options.Value);
+            stopwatch.Stop();
+            _logger.LogInformation("GetEmbeddingStore completed in {ElapsedMilliseconds} ms", stopwatch.ElapsedMilliseconds);
+        } else
+        {
+            EmbeddingCache = new((int)EmbeddingCacheMaxCount);
+        }
         connectionString = _options.ConnectionStrings.SQL;
-        connection = new MySqlConnection(connectionString);
-        connection.Open();
-        helper = new SQLHelper(connection, connectionString);
-        try
-        {
-            DatabaseMigrations.Migrate(helper);
-        }
-        catch (Exception ex)
-        {
-            _logger.LogCritical("Unable to migrate the database due to the exception: {ex}", [ex.Message]);
-            throw;
-        }
+        _connection = new MySqlConnection(connectionString);
+        _connection.Open();
+        Helper = new SQLHelper(_connection, connectionString);
     }
 
     public Searchdomain GetSearchdomain(string searchdomain)
     {
-        if (searchdomains.TryGetValue(searchdomain, out Searchdomain? value))
+        if (_searchdomains.TryGetValue(searchdomain, out Searchdomain? value))
         {
             return value;
         }
         try
         {
-            return SetSearchdomain(searchdomain, new Searchdomain(searchdomain, connectionString, aIProvider, embeddingCache, _logger));
+            return SetSearchdomain(searchdomain, new Searchdomain(searchdomain, connectionString, Helper, AiProvider, EmbeddingCache, _logger));
         }
         catch (MySqlException)
         {
@@ -76,28 +79,19 @@ public class SearchdomainManager
         searchdomain.InvalidateSearchCache();
     }
 
-    public List<string> ListSearchdomains()
+    public async Task<List<string>> ListSearchdomainsAsync()
     {
-        lock (helper.connection)
-        {
-            DbDataReader reader = helper.ExecuteSQLCommand("SELECT name FROM searchdomain", []);
-            List<string> results = [];
-            while (reader.Read())
-            {
-                results.Add(reader.GetString(0));
-            }
-            reader.Close();
-            return results;
-        }
+        return await Helper.ExecuteQueryAsync("SELECT name FROM searchdomain", [], x => x.GetString(0));
     }
 
-    public int CreateSearchdomain(string searchdomain, SearchdomainSettings settings)
+    public async Task<int> CreateSearchdomain(string searchdomain, SearchdomainSettings settings)
     {
-        return CreateSearchdomain(searchdomain, JsonSerializer.Serialize(settings));
+        return await CreateSearchdomain(searchdomain, JsonSerializer.Serialize(settings));
     }
-    public int CreateSearchdomain(string searchdomain, string settings = "{}")
+
+    public async Task<int> CreateSearchdomain(string searchdomain, string settings = "{}")
     {
-        if (searchdomains.TryGetValue(searchdomain, out Searchdomain? value))
+        if (_searchdomains.TryGetValue(searchdomain, out Searchdomain? value))
         {
             _logger.LogError("Searchdomain {searchdomain} could not be created, as it already exists", [searchdomain]);
             throw new SearchdomainAlreadyExistsException(searchdomain);
@@ -107,26 +101,64 @@ public class SearchdomainManager
             { "name", searchdomain },
             { "settings", settings}
         };
-        return helper.ExecuteSQLCommandGetInsertedID("INSERT INTO searchdomain (name, settings) VALUES (@name, @settings)", parameters);
+        int id = await Helper.ExecuteSQLCommandGetInsertedID("INSERT INTO searchdomain (name, settings) VALUES (@name, @settings)", parameters);
+        _searchdomains.Add(searchdomain, new(searchdomain, connectionString, Helper, AiProvider, EmbeddingCache, _logger));
+        return id;
     }
 
-    public int DeleteSearchdomain(string searchdomain)
+    public async Task<int> DeleteSearchdomain(string searchdomain)
     {
-        int counter = _databaseHelper.RemoveAllEntities(helper, searchdomain);
+        int counter = await _databaseHelper.RemoveAllEntities(Helper, searchdomain);
         _logger.LogDebug($"Number of entities deleted as part of deleting the searchdomain \"{searchdomain}\": {counter}");
-        helper.ExecuteSQLNonQuery("DELETE FROM searchdomain WHERE name = @name", new() {{"name", searchdomain}});
-        searchdomains.Remove(searchdomain);
+        await Helper.ExecuteSQLNonQuery("DELETE FROM searchdomain WHERE name = @name", new() {{"name", searchdomain}});
+        _searchdomains.Remove(searchdomain);
         _logger.LogDebug($"Searchdomain has been successfully removed");
         return counter;
     }
+
     private Searchdomain SetSearchdomain(string name, Searchdomain searchdomain)
     {
-        searchdomains[name] = searchdomain;
+        _searchdomains[name] = searchdomain;
         return searchdomain;
     }
 
     public bool IsSearchdomainLoaded(string name)
     {
-        return searchdomains.ContainsKey(name);
+        return _searchdomains.ContainsKey(name);
+    }
+
+    // Cleanup procedure
+    private async Task Cleanup()
+    {
+        try
+        {
+            if (_options.Cache.StoreEmbeddingCache)
+            {
+                var stopwatch = Stopwatch.StartNew();
+                await CacheHelper.UpdateEmbeddingStore(EmbeddingCache, _options);
+                stopwatch.Stop();
+                _logger.LogInformation("UpdateEmbeddingStore completed in {ElapsedMilliseconds} ms", stopwatch.ElapsedMilliseconds);
+            }
+            _logger.LogInformation("SearchdomainManager cleanup completed");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error during SearchdomainManager cleanup");
+        }
+    }
+
+    public void Dispose()
+    {
+        Dispose(true).Wait();
+        GC.SuppressFinalize(this);
+    }
+
+    protected virtual async Task Dispose(bool disposing)
+    {
+        if (!_disposed && disposing)
+        {
+            await Cleanup();
+            _disposed = true;
+        }
     }
 }

src/Server/Server.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
@@ -12,21 +12,22 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AdaptiveExpressions" Version="4.23.0" />
-    <PackageReference Include="ElmahCore" Version="2.1.2" />
-    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="Serilog.AspNetCore" Version="9.0.0" />
-    <PackageReference Include="Serilog.Sinks.File" Version="7.0.0" />
-    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
-        <PackageReference Include="Microsoft.Data.SqlClient" Version="6.0.1" />
-      <PackageReference Include="Microsoft.Data.Sqlite" Version="9.0.3" />
-      <PackageReference Include="MySql.Data" Version="9.2.0" />
-      <PackageReference Include="Npgsql" Version="9.0.3" />
+      <PackageReference Include="AdaptiveExpressions" Version="4.23.1" />
+      <PackageReference Include="ElmahCore" Version="2.1.2" />
+      <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="10.0.2" />
+      <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+      <PackageReference Include="Serilog.AspNetCore" Version="10.0.0" />
+      <PackageReference Include="Serilog.Sinks.File" Version="7.0.0" />
+      <PackageReference Include="Swashbuckle.AspNetCore" Version="10.1.0" />
+      <PackageReference Include="Microsoft.Data.SqlClient" Version="6.1.4" />
+      <PackageReference Include="Microsoft.Data.Sqlite" Version="10.0.2" />
+      <PackageReference Include="MySql.Data" Version="9.6.0" />
+      <PackageReference Include="Npgsql" Version="10.0.1" />
       <PackageReference Include="OllamaSharp" Version="5.2.2" />
-      <PackageReference Include="System.Configuration.ConfigurationManager" Version="9.0.3" />
+      <PackageReference Include="System.Configuration.ConfigurationManager" Version="10.0.2" />
       <PackageReference Include="System.Data.SqlClient" Version="4.9.0" />
-      <PackageReference Include="System.Data.Sqlite" Version="1.0.119" />
-      <PackageReference Include="System.Numerics.Tensors" Version="9.0.3" />
+      <PackageReference Include="System.Data.Sqlite" Version="2.0.2" />
+      <PackageReference Include="System.Numerics.Tensors" Version="10.0.2" />
   </ItemGroup>
 
   <ItemGroup>

src/Server/SimilarityMethods.cs

@@ -5,21 +5,16 @@ namespace Server;
 
 public class SimilarityMethod
 {
-    public SimilarityMethods.similarityMethodDelegate method;
-    public SimilarityMethodEnum similarityMethodEnum;
-    public string name;
+    public SimilarityMethods.similarityMethodDelegate Method;
+    public SimilarityMethodEnum SimilarityMethodEnum;
+    public string Name;
 
-    public SimilarityMethod(SimilarityMethodEnum similarityMethodEnum, ILogger logger)
+    public SimilarityMethod(SimilarityMethodEnum similarityMethodEnum)
     {
-        this.similarityMethodEnum = similarityMethodEnum;
-        this.name = similarityMethodEnum.ToString();
-        SimilarityMethods.similarityMethodDelegate? probMethod = SimilarityMethods.GetMethod(name);
-        if (probMethod is null)
-        {
-            logger.LogError("Unable to retrieve similarityMethod {name}", [name]);
-            throw new Exception("Unable to retrieve similarityMethod");
-        }
-        method = probMethod;
+        SimilarityMethodEnum = similarityMethodEnum;
+        Name = similarityMethodEnum.ToString();
+        SimilarityMethods.similarityMethodDelegate? probMethod = SimilarityMethods.GetMethod(Name) ?? throw new Exception($"Unable to retrieve similarityMethod {Name}");
+        Method = probMethod;
     }
 }
 
@@ -27,11 +22,11 @@ public static class SimilarityMethods
 {
     public delegate float similarityMethodProtoDelegate(float[] vector1, float[] vector2);
     public delegate float similarityMethodDelegate(float[] vector1, float[] vector2);
-    public static readonly Dictionary<SimilarityMethodEnum, similarityMethodProtoDelegate> probMethods;
+    public static readonly Dictionary<SimilarityMethodEnum, similarityMethodProtoDelegate> ProbMethods;
 
     static SimilarityMethods()
     {
-        probMethods = new Dictionary<SimilarityMethodEnum, similarityMethodProtoDelegate>
+        ProbMethods = new Dictionary<SimilarityMethodEnum, similarityMethodProtoDelegate>
         {
             [SimilarityMethodEnum.Cosine] = CosineSimilarity,
             [SimilarityMethodEnum.Euclidian] = EuclidianDistance,
@@ -49,7 +44,7 @@ public static class SimilarityMethods
             methodName
         );
 
-        if (!probMethods.TryGetValue(probMethodEnum, out similarityMethodProtoDelegate? method))
+        if (!ProbMethods.TryGetValue(probMethodEnum, out similarityMethodProtoDelegate? method))
         {
             return null;
         }

src/Server/Tools/CriticalCSS/CriticalCSSGenerator.js

@@ -91,8 +91,8 @@ async function generateCriticalCSSForViews() {
           forceExclude: ['.btn'], // Otherwise buttons end up colorless and .btn overrides other classes like .btn-warning, etc. - so it has to be force-excluded here and re-added later
           forceInclude: [
             '[data-bs-theme="dark"]', '[data-bs-theme="dark"] body', '[data-bs-theme="dark"] .navbar', '[data-bs-theme="dark"] .card', '[data-bs-theme="dark"] .btn',
-            '.navbar',
             '.col-md-4',
+            '.navbar', '.ms-auto', '.dropdown', '.dropdown-menu',
             '.visually-hidden', // visually hidden headings
             '.bi-info-circle-fill', '.text-info', // info icon
             '.container', '.col-md-6', '.row', '.g-4', '.row>*',

src/Server/Tools/CriticalCSS/README.md

@@ -1,5 +1,5 @@
 # How to use CriticalCSS
-1. Install it here
+1. Install the dependencies from here
 ```bash
 npm i -D critical
 npm install puppeteer
@@ -7,5 +7,4 @@ npm install puppeteer
 2. Run the css generator:
 ```bash
 node CriticalCSSGenerator.js
-```
-3. Move the `.css` files from the current directory to the `CriticalCSS/` folder (overwrite existing files)
+```

src/Server/Views/Home/Index.cshtml

@@ -24,6 +24,24 @@
 
     <div class="row g-4">
 
+        <!-- Server -->
+        <div class="col-md-6">
+            <div class="card shadow-sm h-100">
+                <div class="card-body">
+                    <h2 class="card-title fs-5">@T["Server"]</h2>
+
+                    <div class="d-flex justify-content-between mt-2">
+                        <span>@T["Total RAM usage"]</span>
+                        <strong id="serverMemorySize"></strong>
+                    </div>
+                    <div class="d-flex justify-content-between mt-2">
+                        <span>@T["Total Database size"]</span>
+                        <strong id="serverDatabaseSize"></strong>
+                    </div>
+                </div>
+            </div>
+        </div>
+
         <!-- Embedding Cache -->
         <div class="col-md-6">
             <div class="card shadow-sm h-100">
@@ -104,6 +122,43 @@
                         <span>@T["Total query cache utilization"]</span>
                         <strong id="totalQuerycacheUtilization"></strong>
                     </div>
+
+                    <!-- Query cache -->
+                    <div class="d-flex justify-content-between mt-2">
+                        <span>@T["Query cache entry count"]</span>
+                        <strong id="querycacheCount"></strong>
+                    </div>
+
+                    <div class="d-flex justify-content-between mt-2">
+                        <span>
+                            @T["Query cache capacity (loaded)"]
+                            <i class="bi bi-info-circle-fill text-info" 
+                            data-bs-toggle="tooltip" 
+                            title="@T["queryCacheEntryCountLoadedInfo"]"></i>
+                        </span>
+                        <strong id="querycacheLoadedMaxElementCount"></strong>
+                    </div>
+
+                    <div class="progress mt-3" style="height: 8px;">
+                        <div id="querycacheLoadedMaxElementCountProgressBar" class="progress-bar"
+                             style="width: 0.00%"></div>
+                    </div>
+
+
+                    <div class="d-flex justify-content-between mt-2">
+                        <span>
+                            @T["Query cache capacity (all)"]
+                            <i class="bi bi-info-circle-fill text-info" 
+                            data-bs-toggle="tooltip" 
+                            title="@T["queryCacheEntryCountAllInfo"]"></i>
+                        </span>
+                        <strong id="querycacheMaxElementCount"></strong>
+                    </div>
+
+                    <div class="progress mt-3" style="height: 8px;">
+                        <div id="querycacheMaxElementCountProgressBar" class="progress-bar"
+                             style="width: 0.00%"></div>
+                    </div>
                 </div>
             </div>
         </div>
@@ -115,13 +170,6 @@
     var searchdomains = null;
 
     document.addEventListener('DOMContentLoaded', async () => {
-        // Initialize all tooltips
-        var tooltipTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="tooltip"]'))
-        var tooltipList = tooltipTriggerList.map(function (tooltipTriggerEl) {
-            return new bootstrap.Tooltip(tooltipTriggerEl)
-        });
-
-
         let searchdomainCount = document.getElementById("searchdomainCount");
         showThrobber(searchdomainCount);
         let searchdomainEntityCount = document.getElementById("searchdomainEntityCount");
@@ -135,6 +183,21 @@
         let embeddingcacheEmbeddingCount = document.getElementById("embeddingcacheEmbeddingCount");
         showThrobber(embeddingcacheEmbeddingCount);
         let embeddingcacheElementCountProgressBar = document.getElementById("embeddingcacheElementCountProgressBar");
+
+        let querycacheCount = document.getElementById("querycacheCount");
+        showThrobber(querycacheCount);
+        let querycacheMaxElementCount = document.getElementById("querycacheMaxElementCount");
+        showThrobber(querycacheMaxElementCount);
+        let querycacheMaxElementCountProgressBar = document.getElementById("querycacheMaxElementCountProgressBar");
+        let querycacheLoadedMaxElementCount = document.getElementById("querycacheLoadedMaxElementCount");
+        showThrobber(querycacheLoadedMaxElementCount);
+        let querycacheLoadedElementCountProgressBar = document.getElementById("querycacheLoadedElementCountProgressBar");
+
+        let serverMemorySize = document.getElementById("serverMemorySize");
+        showThrobber(serverMemorySize);
+        let serverDatabaseSize = document.getElementById("serverDatabaseSize");
+        showThrobber(serverDatabaseSize);
+
         let healthchecksServer = document.getElementById("healthchecksServer");
         let healthchecksAiProvider = document.getElementById("healthchecksAiProvider");
 
@@ -145,23 +208,38 @@
                 searchdomainCount.textContent = searchdomains.length;
             });
             getServerStats().then(result => {
-                let utilization = result.SizeInBytes;
-                let maxElementCount = result.MaxElementCount;
-                let elementCount = result.ElementCount;
+                let utilization = result.EmbeddingCacheUtilization;
+                let embeddingCacheMaxElementCount = result.EmbeddingCacheMaxElementCount;
+                let embeddingCacheElementCount = result.ElementCount;
                 let embeddingCount = result.EmbeddingsCount;
                 let entityCount = result.EntityCount;
                 let queryCacheUtilization = result.QueryCacheUtilization;
+                let queryCacheElementCount = result.QueryCacheElementCount;
+                let queryCacheMaxElementCountAll = result.QueryCacheMaxElementCountAll;
+                let queryCacheMaxElementCountLoadedSearchdomainsOnly = result.QueryCacheMaxElementCountLoadedSearchdomainsOnly;
                 hideThrobber(embeddingcacheSize);
                 embeddingcacheSize.textContent = NumberOfBytesAsHumanReadable(utilization);
                 hideThrobber(embeddingcacheElementCount);
-                embeddingcacheElementCount.textContent = `${elementCount.toLocaleString()} / ${maxElementCount.toLocaleString()}`;
+                embeddingcacheElementCount.textContent = `${embeddingCacheElementCount.toLocaleString()} / ${embeddingCacheMaxElementCount.toLocaleString()}`;
                 hideThrobber(embeddingcacheEmbeddingCount);
                 embeddingcacheEmbeddingCount.textContent = embeddingCount;
-                embeddingcacheElementCountProgressBar.style.width = `${elementCount / maxElementCount * 100}%`;
+                embeddingcacheElementCountProgressBar.style.width = `${embeddingCacheElementCount / embeddingCacheMaxElementCount * 100}%`;
                 hideThrobber(searchdomainEntityCount);
                 searchdomainEntityCount.textContent = entityCount;
                 hideThrobber(totalQuerycacheUtilization);
                 totalQuerycacheUtilization.textContent = NumberOfBytesAsHumanReadable(queryCacheUtilization);
+                hideThrobber(querycacheMaxElementCount);
+                querycacheCount.textContent = queryCacheElementCount;
+                hideThrobber(querycacheCount);
+                querycacheMaxElementCount.textContent = queryCacheMaxElementCountAll.toLocaleString();
+                querycacheMaxElementCountProgressBar.style.width = `${queryCacheElementCount / queryCacheMaxElementCountAll * 100}%`;
+                hideThrobber(querycacheLoadedMaxElementCount);
+                querycacheLoadedMaxElementCount.textContent = queryCacheMaxElementCountLoadedSearchdomainsOnly.toLocaleString();
+                querycacheLoadedMaxElementCountProgressBar.style.width = `${queryCacheElementCount / queryCacheMaxElementCountLoadedSearchdomainsOnly * 100}%`;
+                serverMemorySize.textContent = NumberOfBytesAsHumanReadable(result.RamTotalSize);
+                hideThrobber(serverMemorySize);
+                serverDatabaseSize.textContent = NumberOfBytesAsHumanReadable(result.DatabaseTotalSize);
+                hideThrobber(serverDatabaseSize);
             });
             getHealthCheckStatusAndApply(healthchecksServer, "/healthz/Database");
             getHealthCheckStatusAndApply(healthchecksAiProvider, "/healthz/AIProvider");

src/Server/Views/Home/Searchdomains.cshtml

@@ -62,11 +62,24 @@
           <!-- Settings -->
           <div class="row align-items-center mb-3">
             <h3>@T["Settings"]</h3>
-            <div class="col-md-6">
+            <div class="col-md-3">
+              <label class="form-check-label" for="searchdomainConfigQueryCacheSize">@T["Query cache size"]:</label>
+              <input type="number" class="form-control" id="searchdomainConfigQueryCacheSize" />
+            </div>
+            <div class="col-md-6 mt-3">
               <input type="checkbox" class="form-check-input" id="searchdomainConfigCacheReconciliation" />
               <label class="form-check-label" for="searchdomainConfigCacheReconciliation">@T["Cache reconciliation"]</label>
             </div>
-            <div class="col-md-2 mt-3 mt-md-0">
+            <div class="col-md-6 mt-3">
+              <input type="checkbox" class="form-check-input" id="searchdomainConfigParallelEmbeddingsPrefetch" />
+              <label class="form-check-label" for="searchdomainConfigParallelEmbeddingsPrefetch">@T["Embeddings parallel prefetching"]</label>
+              <i class="bi bi-info-circle-fill text-info" 
+                data-bs-toggle="tooltip" 
+                title="@T["parallelEmbeddingsPrefetchInfo"]"></i>
+            </div>
+          </div>
+          <div class="row align-items-center mb-3">
+            <div class="col-md-2 mt-md-0">
               <button class="btn btn-warning w-100" id="searchdomainConfigUpdate">@T["Update"]</button>
             </div>
           </div>
@@ -252,12 +265,13 @@
 
         <!-- Results -->
         <h3>@T["Results"]</h3>
+        <button class="btn btn-primary btn-sm" onclick="queryUpdateAddResult('', '', null, true)">@T["Add result"]</button>
         <table class="table table-sm table-striped">
           <thead>
             <tr>
               <th style="width: 85px;">@T["Score"]</th>
               <th>@T["Name"]</th>
-              <th>@T["Action"]</th>
+              <th class="text-center">@T["Action"]</th>
             </tr>
           </thead>
           <tbody id="queryUpdateResultsBody"></tbody>
@@ -347,10 +361,24 @@
       </div>
 
       <div class="modal-body">
-        <label for="createSearchdomainName" class="form-label">@T["Searchdomain name"]</label>
-        <input type="text" class="form-control mb-3" id="createSearchdomainName" placeholder="@T["Searchdomain name"]" />
-        <input type="checkbox" class="form-check-input" id="createSearchdomainWithCacheReconciliation" />
-        <label class="form-check-label" for="createSearchdomainWithCacheReconciliation">@T["Enable cache reconciliation"]</label>
+        <div class="row align-items-center mb-3">
+          <div class="col-md-12">
+            <label for="createSearchdomainName" class="form-label">@T["Searchdomain name"]</label>
+            <input type="text" class="form-control mb-3" id="createSearchdomainName" placeholder="@T["Searchdomain name"]" />
+          </div>
+          <div class="col-md-5">
+            <label class="form-check-label mb-2" for="createSearchdomainQueryCacheSize">@T["Query cache size"]:</label>
+            <input type="number" class="form-control" id="createSearchdomainQueryCacheSize" />
+          </div>
+          <div class="col-md-7 mt-3">
+            <input type="checkbox" class="form-check-input" id="createSearchdomainWithCacheReconciliation" />
+            <label class="form-check-label" for="createSearchdomainWithCacheReconciliation">@T["Enable cache reconciliation"]</label>
+          </div>
+          <div class="col-md-6 mt-3">
+            <input type="checkbox" class="form-check-input" id="createSearchdomainConfigParallelEmbeddingsPrefetch" />
+            <label class="form-check-label" for="createSearchdomainConfigParallelEmbeddingsPrefetch">@T["Embeddings parallel prefetching"]</label>
+          </div>
+        </div>
       </div>
 
       <div class="modal-footer">
@@ -656,7 +684,10 @@
         queriesFilter.addEventListener('input', () => {
             populateQueriesTable(queriesFilter.value);
         });
-        selectDomain(0);
+        try
+        {
+            selectDomain(0);
+        } catch (error) {}
 
         document
             .getElementById('searchdomainRename')
@@ -694,7 +725,9 @@
             .addEventListener('click', () => {
                 const domainKey = getSelectedDomainKey();
                 const cacheReconciliation = document.getElementById('searchdomainConfigCacheReconciliation').checked;
-                updateSearchdomainConfig(domainKey, { CacheReconciliation: cacheReconciliation});
+                const queryCacheSize = document.getElementById('searchdomainConfigQueryCacheSize').value;
+                const parallelEmbeddingsPrefetch = document.getElementById('searchdomainConfigParallelEmbeddingsPrefetch').checked;
+                updateSearchdomainConfig(domainKey, { CacheReconciliation: cacheReconciliation, QueryCacheSize: queryCacheSize, ParallelEmbeddingsPrefetch: parallelEmbeddingsPrefetch});
             });
 
         document
@@ -775,9 +808,10 @@
                     document.getElementById('createSearchdomainModal')
                 );
                 const name = document.getElementById('createSearchdomainName').value;
+                const queryCacheSize = document.getElementById('createSearchdomainQueryCacheSize').value;
                 const cacheReconciliation = document.getElementById('createSearchdomainWithCacheReconciliation').checked;
-                const settings = { CacheReconciliation: cacheReconciliation };
-                // Implement create logic here
+                const parallelEmbeddingsPrefetch = document.getElementById('createSearchdomainConfigParallelEmbeddingsPrefetch').checked;
+                const settings = { CacheReconciliation: cacheReconciliation, QueryCacheSize: queryCacheSize, ParallelEmbeddingsPrefetch: parallelEmbeddingsPrefetch };
                 fetch(`/Searchdomain?searchdomain=${encodeURIComponent(name)}`, {
                     method: 'POST',
                     headers: {
@@ -869,12 +903,12 @@
                 var data = [{
                   "name": name,
                   "probmethod": probMethod,
-                  "searchdomain": encodeURIComponent(domains[getSelectedDomainKey()]),
+                  "searchdomain": domains[getSelectedDomainKey()],
                   "attributes": attributes,
                   "datapoints": datapoints
                 }];
                 showToast("@T["Updating entity"]", "primary");
-                fetch(`/Entity`, {
+                fetch(`/Entities`, {
                     method: 'PUT',
                     headers: {
                         'Content-Type': 'application/json'
@@ -937,7 +971,7 @@
                 }).then(async response => {
                     result = await response.json();
                     if (response.ok && result.Success) {
-                        showToast("@T["Searchdomain was created successfully"]", "success");
+                        showToast("@T["Search query was updated successfully"]", "success");
                         console.log('Search query was updated successfully');
                         selectDomain(getSelectedDomainKey());
                     } else {
@@ -1053,7 +1087,12 @@
 
         let searchdomainConfigPromise = getSearchdomainConfig(getSelectedDomainKey());
         let configElementCachereconciliation = document.getElementById('searchdomainConfigCacheReconciliation');
+        let configElementCacheSize = document.getElementById('searchdomainConfigQueryCacheSize');
+        let configElementParallelEmbeddingsPrefetch = document.getElementById('searchdomainConfigParallelEmbeddingsPrefetch');
 
+        showThrobber(document.querySelector('#searchdomainConfigQueryCacheSize'), true);
+        showThrobber(document.querySelector('#searchdomainConfigCacheReconciliation'), true);
+        showThrobber(document.querySelector('#searchdomainConfigParallelEmbeddingsPrefetch'), true);
         let cacheUtilizationPromise = getSearchdomainCacheUtilization(getSelectedDomainKey());
         let databaseUtilizationPromise = getSearchdomainDatabaseUtilization(getSelectedDomainKey());
 
@@ -1095,10 +1134,15 @@
             });
 
         searchdomainConfigPromise.then(searchdomainConfig => {
+            hideThrobber(document.querySelector('#searchdomainConfigCacheReconciliation'), true);
+            hideThrobber(document.querySelector('#searchdomainConfigParallelEmbeddingsPrefetch'), true);
+
             if (searchdomainConfig != null && searchdomainConfig.Settings != null)
             {
+                configElementCacheSize.value = searchdomainConfig.Settings.QueryCacheSize;
                 configElementCachereconciliation.checked = searchdomainConfig.Settings.CacheReconciliation;
                 configElementCachereconciliation.disabled = false;
+                configElementParallelEmbeddingsPrefetch.checked = searchdomainConfig.Settings.ParallelEmbeddingsPrefetch;
             } else {
                 configElementCachereconciliation.disabled = true;
                 showToast("@T["Unable to fetch searchdomain config"]", "danger");
@@ -1106,10 +1150,11 @@
             }
         });
         cacheUtilizationPromise.then(cacheUtilization => {
-            if (cacheUtilization != null && cacheUtilization.QueryCacheSizeBytes != null)
+            hideThrobber(document.querySelector('#searchdomainConfigQueryCacheSize'), true);
+            if (cacheUtilization != null && cacheUtilization.SizeBytes != null)
             {
                 document.querySelector('#cacheUtilization').innerText =
-                    `${NumberOfBytesAsHumanReadable(cacheUtilization.QueryCacheSizeBytes)}`;
+                    `${NumberOfBytesAsHumanReadable(cacheUtilization.SizeBytes)}`;
             } else {
                 showToast("@T["Unable to fetch searchdomain cache utilization"]", "danger");
                 console.error('Failed to fetch searchdomain cache utilization');
@@ -1289,14 +1334,30 @@
       domainItem.classList.add('list-group-item-danger');
     }
 
-    function showThrobber(element = null) {
+    function showThrobber(element = null, direct = false) {
       if (element == null) element = document;
-      element.querySelector('.spinner').classList.remove('d-none');
+      if (direct) {
+        let spinner = document.createElement('div');
+        spinner.classList.add('spinner');
+        spinner.style.position = "absolute";
+        spinner.style.marginTop = "0.5rem";
+        spinner.style.marginLeft = "0.5rem";
+        element.style.opacity = "0.25";
+        element.parentElement.insertBefore(spinner, element);
+      } else {
+        element.querySelector('.spinner').classList.remove('d-none');
+      }
+
     }
 
-    function hideThrobber(element = null) {
+    function hideThrobber(element = null, direct = false) {
       if (element == null) element = document;
-      element.querySelector('.spinner').classList.add('d-none');
+      if (direct) {
+        element.previousElementSibling.remove()
+        element.style.opacity = "1";
+      } else {
+        element.querySelector('.spinner').classList.add('d-none');
+      }
     }
 
     function showEntityDetails(entity) {
@@ -1434,28 +1495,7 @@
                 </tr>`;
         } else {
             query.Results.forEach(r => {
-                const row = document.createElement('tr');
-                row.setAttribute("draggable", true);
-                const tdScore = document.createElement('td');
-                const scoreInput = document.createElement('input');
-                scoreInput.classList.add('form-control');
-                scoreInput.value = r.Score.toFixed(4);
-                tdScore.append(scoreInput);
-                const tdName = document.createElement('td');
-                tdName.classList.add("text-break");
-                tdName.innerText = r.Name;
-                const tdAction = document.createElement('td');
-                const deleteButton = document.createElement('button');
-                deleteButton.classList.add('btn', 'btn-danger', 'btn-sm');
-                deleteButton.innerText = '@Html.Raw(T["Delete"])';
-                deleteButton.onclick = function() {
-                    row.remove();
-                };
-                tdAction.append(deleteButton);
-                row.append(tdScore);
-                row.append(tdName);
-                row.append(tdAction);
-                resultsBody.appendChild(row);
+                queryUpdateAddResult(r.Score.toFixed(4), r.Name, resultsBody);
             });
         }
 
@@ -1466,6 +1506,66 @@
         modal.show();
     }
 
+    function queryUpdateAddResult(score, name, target=null, insertAtTop=false) {
+        target = target ?? document.getElementById('queryUpdateResultsBody');
+
+        const row = document.createElement('tr');
+        row.setAttribute("draggable", true);
+        const tdScore = document.createElement('td');
+        const scoreInput = document.createElement('input');
+        scoreInput.classList.add('form-control');
+        scoreInput.value = score;
+        scoreInput.ariaLabel = "@T["Score"]";
+        tdScore.append(scoreInput);
+        const tdName = document.createElement('td');
+        const tdNameInput = document.createElement('input');
+        tdNameInput.classList.add("form-control");
+        tdNameInput.value = name;
+        tdNameInput.ariaLabel = "@T["Name"]";
+        tdName.append(tdNameInput);
+        const tdAction = document.createElement('td');
+        tdAction.classList.add('text-center');
+
+        const upButton = document.createElement('button');
+        upButton.classList.add('btn', 'btn-primary', 'btn-sm');
+        upButton.innerText = '↑';
+        upButton.onclick = function() {
+            const currentRow = this.closest('tr');
+            const previousRow = currentRow.previousElementSibling;
+            if (previousRow) {
+                target.insertBefore(currentRow, previousRow);
+            }
+        };
+        const downButton = document.createElement('button');
+        downButton.classList.add('btn', 'btn-primary', 'btn-sm', 'mx-1');
+        downButton.innerText = '↓';
+        downButton.onclick = function() {
+            const currentRow = this.closest('tr');
+            const nextRow = currentRow.nextElementSibling;
+            if (nextRow) {
+                target.insertBefore(nextRow, currentRow);
+            }
+        };
+
+        const deleteButton = document.createElement('button');
+        deleteButton.classList.add('btn', 'btn-danger', 'btn-sm', 'mx-2');
+        deleteButton.innerText = '@Html.Raw(T["Delete"])';
+        deleteButton.onclick = function() {
+            row.remove();
+        };
+        tdAction.append(upButton);
+        tdAction.append(downButton);
+        tdAction.append(deleteButton);
+        row.append(tdScore);
+        row.append(tdName);
+        row.append(tdAction);
+        if (!insertAtTop) {
+            target.appendChild(row);
+        } else {
+            target.insertBefore(row, target.firstChild);
+        }
+    }
+
     function NumberOfBytesAsHumanReadable(bytes, decimals = 2) {
         if (bytes === 0) return '0 B';
         if (bytes > 1.20892581961*(10**27)) return "∞ B";
@@ -1672,7 +1772,7 @@
             
             // Get the text content from the second cell (index 1) which contains the path
             const score = parseFloat(cells[0].firstChild.value);
-            const name = cells[1].textContent.trim();
+            const name = cells[1].firstChild.value;
             
             result.push({
                 "Score": score,

src/Server/Views/Shared/_Layout.cshtml

@@ -12,6 +12,7 @@
     <meta name="description" content="Embeddingsearch server" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>@ViewData["Title"] - embeddingsearch</title>
+    <link rel="preload" href="~/fonts/bootstrap-icons.woff2" as="font" type="font/woff2" crossorigin="anonymous"/>
     @if (!Context.Request.Query.ContainsKey("renderRaw") && !Context.Request.Query.ContainsKey("noCriticalCSS"))
     {
         <link rel="preload" href="~/lib/bootstrap/dist/css/bootstrap.min.css" as="style"/>
@@ -51,7 +52,9 @@
     <header>
         <nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-light border-bottom box-shadow mb-3">
             <div class="container-fluid">
-                <a class="navbar-brand" asp-area="" asp-controller="Home" asp-action="Index">embeddingsearch</a>
+                <a class="navbar-brand" asp-area="" asp-controller="Home" asp-action="Index">
+                    <img fetchpriority="high" alt="Logo" src="/logo.png" width="40" height="40" style="width: 40px; height: 40px;">
+                </a>
                 <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target=".navbar-collapse" aria-controls="navbarSupportedContent"
                         aria-expanded="false" aria-label="Toggle navigation">
                     <span class="navbar-toggler-icon"></span>
@@ -68,17 +71,20 @@
                             </li>
                             @if (User.IsInRole("Admin") || User.IsInRole("Swagger"))
                             {
-                                <li class="nav-item">
-                                    <a class="nav-link text" href="/swagger/index.html?ReturnUrl=@(currentUrl)">@T["Swagger"]</a>
+                                <li class="nav-item dropdown">
+                                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                                        @T["Tools"]
+                                    </a>
+                                    <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
+                                        <a class="dropdown-item" href="/swagger/index.html?ReturnUrl=@(currentUrl)">@T["Swagger"]</a>
+                                        @if (User.IsInRole("Admin"))
+                                        {
+                                            <a class="dropdown-item" href="/elmah?ReturnUrl=@(currentUrl)">@T["Elmah"]</a>
+                                        }
+                                    </div>
                                 </li>
                             }
-                            @if (User.IsInRole("Admin"))
-                            {
-                                <li class="nav-item">
-                                    <a class="nav-link text" href="/elmah?ReturnUrl=@(currentUrl)">@T["Elmah"]</a>
-                                </li>
-                            }
-                            <li class="nav-item">
+                            <li class="nav-item ms-auto">
                                 <a class="nav-link text" asp-area="" asp-controller="Account" asp-action="Logout">@T["Logout"]</a>
                             </li>
                         }

src/Server/appsettings.Development.json

@@ -15,12 +15,12 @@
   
   "Embeddingsearch": {
     "ConnectionStrings": {
-      "SQL": "server=localhost;database=embeddingsearch;uid=embeddingsearch;pwd=somepassword!;"
+      "SQL": "server=localhost;database=embeddingsearch;uid=embeddingsearch;pwd=somepassword!;",
+      "Cache": "Data Source=embeddings.db;Mode=ReadWriteCreate;Cache=Shared"
     },
     "Elmah": {
       "LogPath": "~/logs"
     },
-    "EmbeddingCacheMaxCount": 10000000,
     "AiProviders": {
       "ollama": {
         "handler": "ollama",
@@ -46,6 +46,11 @@
       ]
     },
     "ApiKeys": ["Some UUID here", "Another UUID here"],
-    "UseHttpsRedirection": true
+    "UseHttpsRedirection": true,
+    "Cache": {
+      "CacheTopN": 100000,
+      "StoreEmbeddingCache": true,
+      "StoreTopN": 20000
+    }
   }
 }

src/Server/appsettings.Docker.json

@@ -15,27 +15,41 @@
   "UseSwagger": true,
   "Embeddingsearch": {
     "ConnectionStrings": {
-      "SQL": "server=localhost;database=embeddingsearch;uid=embeddingsearch;pwd=somepassword!;"
+      "SQL": "server=localhost;database=embeddingsearch;uid=embeddingsearch;pwd=somepassword!;",
+      "Cache": "Data Source=embeddings.db;Mode=ReadWriteCreate;Cache=Shared"
     },
     "Elmah": {
-      "AllowedHosts": [
-        "127.0.0.1",
-        "::1",
-        "172.17.0.1"
-      ]
+      "LogPath": "~/logs"
     },
     "AiProviders": {
       "ollama": {
         "handler": "ollama",
-        "baseURL": "http://localhost:11434"
+        "baseURL": "http://localhost:11434",
+        "Allowlist": [".*"],
+        "Denylist": ["qwen3-coder:latest", "qwen3:0.6b", "qwen3-vl", "deepseek-ocr"]
       },
       "localAI": {
         "handler": "openai",
         "baseURL": "http://localhost:8080",
-        "ApiKey": "Some API key here"
+        "ApiKey": "Some API key here",
+        "Allowlist": [".*"],
+        "Denylist": ["cross-encoder", "jina-reranker-v1-tiny-en", "whisper-small"]
       }
     },
-    "ApiKeys": ["Some UUID here", "Another UUID here"],
-    "UseHttpsRedirection": true
+    "SimpleAuth": {
+      "Users": [
+        {
+          "Username": "admin",
+          "Password": "UnsafePractice.67",
+          "Roles": ["Admin"]
+        }
+      ]
+    },
+    "ApiKeys": ["APIKeyOfYourChoice", "AnotherOneIfYouLike"],
+    "Cache": {
+      "CacheTopN": 10000,
+      "StoreEmbeddingCache": true,
+      "StoreTopN": 10000
+    }
   }
 }

src/Server/appsettings.json

@@ -16,5 +16,8 @@
         "Application": "Embeddingsearch.Server"
     }
   },
+  "Embeddingsearch": {
+    "MaxRequestBodySize": 524288000
+  },
   "AllowedHosts": "*"
 }

src/Server/wwwroot/css/site.css

@@ -79,4 +79,8 @@ url("/fonts/bootstrap-icons.woff") format("woff");
 td.btn-group {
   display: revert;
   min-width: 15rem;
+}
+
+[data-bs-theme="light"] img[alt="Logo"] {
+  filter: invert(100%);
 }

src/Server/wwwroot/js/site.js

@@ -48,4 +48,14 @@ function showToast(message, type) {
     const bsToast = new bootstrap.Toast(toast, { delay: 10000 });
     bsToast.show();
     toast.addEventListener('hidden.bs.toast', () => toast.remove());
-}
+}
+
+document.addEventListener('DOMContentLoaded', async () => {
+    // Initialize all tooltips
+    var tooltipTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="tooltip"]'))
+    var tooltipList = tooltipTriggerList.map(function (tooltipTriggerEl) {
+        let retVal = new bootstrap.Tooltip(tooltipTriggerEl);
+        tooltipTriggerEl.role = "tooltip";
+        return retVal;
+    });
+});

src/Shared/LRUCache.cs

@@ -0,0 +1,240 @@
+namespace Shared;
+
+public sealed class EnumerableLruCache<TKey, TValue> where TKey : notnull
+{
+    private sealed record CacheItem(TKey Key, TValue Value);
+
+    private readonly Dictionary<TKey, LinkedListNode<CacheItem>> _map;
+    private readonly LinkedList<CacheItem> _lruList;
+    private readonly ReaderWriterLockSlim _lock = new();
+
+    private int _capacity;
+
+    public EnumerableLruCache(int capacity)
+    {
+        if (capacity <= 0)
+            throw new ArgumentOutOfRangeException(nameof(capacity));
+
+        _capacity = capacity;
+        _map = new Dictionary<TKey, LinkedListNode<CacheItem>>(capacity);
+        _lruList = new LinkedList<CacheItem>();
+    }
+
+    public int Capacity
+    {
+        get
+        {
+            _lock.EnterReadLock();
+            try
+            {
+                return _capacity;
+            }
+            finally
+            {
+                _lock.ExitReadLock();
+            }
+        }
+        set
+        {
+            ArgumentOutOfRangeException.ThrowIfNegativeOrZero(value);
+
+            _lock.EnterWriteLock();
+            try
+            {
+                _capacity = value;
+                TrimIfNeeded();
+            }
+            finally
+            {
+                _lock.ExitWriteLock();
+            }
+        }
+    }
+
+    public int Count
+    {
+        get
+        {
+            _lock.EnterReadLock();
+            try
+            {
+                return _map.Count;
+            }
+            finally
+            {
+                _lock.ExitReadLock();
+            }
+        }
+    }
+
+    public TValue this[TKey key]
+    {
+        get
+        {
+            if (!TryGetValue(key, out var value))
+                throw new KeyNotFoundException();
+
+            return value!;
+        }
+        set => Set(key, value);
+    }
+
+    public bool TryGetValue(TKey key, out TValue? value)
+    {
+        _lock.EnterUpgradeableReadLock();
+        try
+        {
+            if (!_map.TryGetValue(key, out var node))
+            {
+                value = default;
+                return false;
+            }
+
+            value = node.Value.Value;
+
+            // LRU aktualisieren
+            _lock.EnterWriteLock();
+            try
+            {
+                _lruList.Remove(node);
+                _lruList.AddFirst(node);
+            }
+            finally
+            {
+                _lock.ExitWriteLock();
+            }
+
+            return true;
+        }
+        finally
+        {
+            _lock.ExitUpgradeableReadLock();
+        }
+    }
+
+    public void Set(TKey key, TValue value)
+    {
+        _lock.EnterWriteLock();
+        try
+        {
+            if (_map.TryGetValue(key, out var existing))
+            {
+                // Update + nach vorne
+                existing.Value = existing.Value with { Value = value };
+                _lruList.Remove(existing);
+                _lruList.AddFirst(existing);
+                return;
+            }
+
+            var item = new CacheItem(key, value);
+            var node = new LinkedListNode<CacheItem>(item);
+
+            _lruList.AddFirst(node);
+            _map[key] = node;
+
+            TrimIfNeeded();
+        }
+        finally
+        {
+            _lock.ExitWriteLock();
+        }
+    }
+
+    public bool Remove(TKey key)
+    {
+        _lock.EnterWriteLock();
+        try
+        {
+            if (!_map.TryGetValue(key, out var node))
+                return false;
+
+            _lruList.Remove(node);
+            _map.Remove(key);
+            return true;
+        }
+        finally
+        {
+            _lock.ExitWriteLock();
+        }
+    }
+
+    public bool ContainsKey(TKey key)
+    {
+        _lock.EnterReadLock();
+        try
+        {
+            return _map.ContainsKey(key);
+        }
+        finally
+        {
+            _lock.ExitReadLock();
+        }
+    }
+
+    public Dictionary<TKey, TValue> AsDictionary()
+    {
+        _lock.EnterReadLock();
+        try
+        {
+            return _map.Values.ToDictionary(
+                n => n.Value.Key,
+                n => n.Value.Value
+            );
+        }
+        finally
+        {
+            _lock.ExitReadLock();
+        }
+    }
+
+    public IEnumerable<KeyValuePair<TKey, TValue>> Items()
+    {
+        _lock.EnterReadLock();
+        try
+        {
+            foreach (var item in _lruList)
+            {
+                yield return new KeyValuePair<TKey, TValue>(item.Key, item.Value);
+            }
+        }
+        finally
+        {
+            _lock.ExitReadLock();
+        }
+    }
+
+    public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
+    {
+        List<KeyValuePair<TKey, TValue>> snapshot;
+
+        _lock.EnterReadLock();
+        try
+        {
+            snapshot = new List<KeyValuePair<TKey, TValue>>(_map.Count);
+
+            foreach (var item in _lruList)
+            {
+                snapshot.Add(new KeyValuePair<TKey, TValue>(
+                    item.Key,
+                    item.Value
+                ));
+            }
+        }
+        finally
+        {
+            _lock.ExitReadLock();
+        }
+
+        return snapshot.GetEnumerator();
+    }
+
+    private void TrimIfNeeded()
+    {
+        while (_map.Count > _capacity)
+        {
+            var lruNode = _lruList.Last!;
+            _lruList.RemoveLast();
+            _map.Remove(lruNode.Value.Key);
+        }
+    }
+}

src/Shared/Models/EntityResults.cs

@@ -20,6 +20,23 @@ public class EntityQueryResult
     public Dictionary<string, string>? Attributes { get; set; }
 }
 
+public class EntityRerankResults : SuccesMessageBaseModel
+{
+    [JsonPropertyName("Results")]
+    public required List<EntityRerankResult> Results { get; set; }
+}
+
+public class EntityRerankResult
+{
+    [JsonPropertyName("Name")]
+    public required string Name { get; set; }
+    [JsonPropertyName("Value")]
+    public float Value { get; set; }
+    [JsonPropertyName("Attributes")]
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public Dictionary<string, string>? Attributes { get; set; }
+}
+
 public class EntityIndexResult : SuccesMessageBaseModel {}
 
 public class EntityListResults

src/Shared/Models/SearchdomainModels.cs

@@ -95,10 +95,14 @@ public struct DateTimedSearchResult(DateTime dateTime, List<ResultItem> results)
     }
 }
 
-public struct SearchdomainSettings(bool cacheReconciliation = false)
+public struct SearchdomainSettings(bool cacheReconciliation = false, int queryCacheSize = 1_000_000, bool parallelEmbeddingsPrefetch = false)
 {
     [JsonPropertyName("CacheReconciliation")]
     public bool CacheReconciliation { get; set; } = cacheReconciliation;
+    [JsonPropertyName("QueryCacheSize")]
+    public int QueryCacheSize { get; set; } = queryCacheSize;
+    [JsonPropertyName("ParallelEmbeddingsPrefetch")]
+    public bool ParallelEmbeddingsPrefetch { get; set; } = parallelEmbeddingsPrefetch;
 }
 
 public static class MemorySizes

src/Shared/Models/SearchdomainResults.cs

@@ -1,4 +1,5 @@
 using System.Text.Json.Serialization;
+using Shared;
 
 namespace Shared.Models;
 
@@ -25,7 +26,7 @@ public class SearchdomainDeleteResults : SuccesMessageBaseModel
     public required int DeletedEntities { get; set; }
 }
 
-public class SearchdomainSearchesResults : SuccesMessageBaseModel
+public class SearchdomainQueriesResults : SuccesMessageBaseModel
 {
     [JsonPropertyName("Searches")]
     public required Dictionary<string, DateTimedSearchResult> Searches { get; set; }
@@ -41,10 +42,14 @@ public class SearchdomainSettingsResults : SuccesMessageBaseModel
     public required SearchdomainSettings? Settings { get; set; }
 }
 
-public class SearchdomainSearchCacheSizeResults : SuccesMessageBaseModel
+public class SearchdomainQueryCacheSizeResults : SuccesMessageBaseModel
 {
-    [JsonPropertyName("QueryCacheSizeBytes")]
-    public required long? QueryCacheSizeBytes { get; set; }
+    [JsonPropertyName("ElementCount")]
+    public required int? ElementCount { get; set; }
+    [JsonPropertyName("ElementMaxCount")]
+    public required int? ElementMaxCount { get; set; }
+    [JsonPropertyName("SizeBytes")]
+    public required long? SizeBytes { get; set; }
 }
 
 public class SearchdomainInvalidateCacheResults : SuccesMessageBaseModel {}

src/Shared/Models/ServerModels.cs

@@ -10,16 +10,26 @@ public class ServerGetModelsResult : SuccesMessageBaseModel
 
 public class ServerGetStatsResult : SuccesMessageBaseModel
 {
-    [JsonPropertyName("SizeInBytes")]
-    public long? SizeInBytes { get; set; }
-    [JsonPropertyName("MaxElementCount")]
-    public long? MaxElementCount { get; set; }
+    [JsonPropertyName("EmbeddingCacheUtilization")]
+    public long? EmbeddingCacheUtilization { get; set; }
+    [JsonPropertyName("EmbeddingCacheMaxElementCount")]
+    public long? EmbeddingCacheMaxElementCount { get; set; }
     [JsonPropertyName("ElementCount")]
-    public long? ElementCount { get; set; }
+    public long? EmbeddingCacheElementCount { get; set; }
     [JsonPropertyName("EmbeddingsCount")]
     public long? EmbeddingsCount { get; set; }
     [JsonPropertyName("EntityCount")]
     public long? EntityCount { get; set; }
+    [JsonPropertyName("QueryCacheElementCount")]
+    public long? QueryCacheElementCount { get; set; }
+    [JsonPropertyName("QueryCacheMaxElementCountAll")]
+    public long? QueryCacheMaxElementCountAll { get; set; }
+    [JsonPropertyName("QueryCacheMaxElementCountLoadedSearchdomainsOnly")]
+    public long? QueryCacheMaxElementCountLoadedSearchdomainsOnly { get; set; }
     [JsonPropertyName("QueryCacheUtilization")]
     public long? QueryCacheUtilization { get; set; }
+    [JsonPropertyName("DatabaseTotalSize")]
+    public long? DatabaseTotalSize { get; set; }
+    [JsonPropertyName("RamTotalSize")]
+    public long? RamTotalSize { get; set; }
 }

src/Shared/Shared.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>