Added local RAG (#756)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/Databases/DatabaseClientProvider.cs

@@ -1,5 +1,6 @@
-using AIStudio.Tools.Services;
+using AIStudio.Tools.Databases.IndexStore;
 using AIStudio.Tools.Databases.VectorStore;
+using AIStudio.Tools.Services;
 
 namespace AIStudio.Tools.Databases;
 
@@ -44,10 +45,10 @@ public sealed class DatabaseClientProvider(RustService rustService, ILoggerFacto
         }
     }
 
-    public async Task<IVectorStoreClient> GetVectorStoreAsync(CancellationToken cancellationToken = default)
+    public async Task<VectorStoreClient> GetVectorStoreAsync(CancellationToken cancellationToken = default)
     {
         var client = await this.GetClientAsync(DatabaseRole.VECTOR_STORE, cancellationToken);
-        if (client is IVectorStoreClient vectorStore)
+        if (client is VectorStoreClient vectorStore)
             return vectorStore;
 
         return new NoVectorStoreClient(
@@ -56,6 +57,18 @@ public sealed class DatabaseClientProvider(RustService rustService, ILoggerFacto
             client.Status);
     }
 
+    public async Task<IndexStoreClient> GetIndexStoreAsync(CancellationToken cancellationToken = default)
+    {
+        var client = await this.GetClientAsync(DatabaseRole.INDEX_STORE, cancellationToken);
+        if (client is IndexStoreClient indexStore)
+            return indexStore;
+
+        return new NoIndexStoreClient(
+            client.Name,
+            "The configured database client does not support local RAG index operations.",
+            client.Status);
+    }
+
     private DatabaseClient CacheIfAvailable(DatabaseRole databaseRole, DatabaseClient client)
     {
         if (!client.IsAvailable)
@@ -92,6 +105,7 @@ public sealed class DatabaseClientProvider(RustService rustService, ILoggerFacto
     private async Task<DatabaseClient> CreateClientAsync(DatabaseRole databaseRole, CancellationToken cancellationToken) => databaseRole switch
     {
         DatabaseRole.VECTOR_STORE => await QdrantEdgeClientImplementation.CreateAsync(rustService, this.logger, this.databaseClientLogger, cancellationToken),
+        DatabaseRole.INDEX_STORE => await SqliteIndexStoreClientImplementation.CreateAsync(this.logger, this.databaseClientLogger, cancellationToken),
         _ => new NoDatabaseClient(databaseRole.ToString(), "The requested database role is not supported.")
     };