Improved entity deletion

src/Server/Helper/DatabaseHelper.cs

@@ -117,6 +117,19 @@ public static class DatabaseHelper
         entityCache.RemoveAll(entity => entity.name == name);
     }
 
+    public static int RemoveAllEntities(SQLHelper helper, string searchdomain)
+    {
+        Dictionary<string, dynamic> parameters = new()
+        {
+            { "searchdomain", 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);
+    }
+
     public static bool HasEntity(SQLHelper helper, string name, string searchdomain)
     {
         Dictionary<string, dynamic> parameters = new()

src/Server/Helper/SQLHelper.cs

@@ -40,7 +40,7 @@ public class SQLHelper:IDisposable
         }
     }
 
-    public void ExecuteSQLNonQuery(string query, Dictionary<string, dynamic> parameters)
+    public int ExecuteSQLNonQuery(string query, Dictionary<string, dynamic> parameters)
     {
         lock (connection)
         {
@@ -52,7 +52,7 @@ public class SQLHelper:IDisposable
             {
                 command.Parameters.AddWithValue($"@{parameter.Key}", parameter.Value);
             }
-            command.ExecuteNonQuery();
+            return command.ExecuteNonQuery();
         }
     }
 

src/Server/SearchdomainManager.cs

@@ -100,12 +100,7 @@ public class SearchdomainManager
     public int DeleteSearchdomain(string searchdomain)
     {
         Searchdomain searchdomain_ = GetSearchdomain(searchdomain);
-        int counter = 0;
-        while (searchdomain_.entityCache.Count > 0)
-        {
-            DatabaseHelper.RemoveEntity(searchdomain_.entityCache, helper, searchdomain_.entityCache.First().name, searchdomain);
-            counter += 1;
-        }
+        int counter = 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);