Implement Delete Database Service #7506

Author: tobiu

.github/ISSUE/epic-architect-knowledge-base-as-mcp.md

@@ -32,3 +32,4 @@ We will employ a rapid and agile development approach. The scope and API specifi
 - **Sub-Tasks:**
     - `ticket-kb-implement-tool-service.md`: Implement the core tool service to dynamically load tools from the OpenAPI spec.
     - `ticket-kb-implement-healthcheck-service.md`: Implement the healthcheck service to verify the connection to ChromaDB.
+    - `ticket-kb-implement-delete-db-service.md`: Implement the service to delete the ChromaDB collection.

.github/ISSUE/ticket-kb-implement-delete-db-service.md

@@ -0,0 +1,22 @@
+---
+title: Implement Delete Database Service
+labels: enhancement, AI
+---
+
+Parent epic: #7501
+GH ticket id: #placeholder
+
+**Phase:** 2
+**Assignee:** tobiu
+**Status:** Done
+
+## Description
+
+This ticket covers the implementation of the `delete_database` service for the AI Knowledge Base MCP server. This service will expose the destructive but necessary functionality to completely remove the knowledge base collection from ChromaDB, allowing for a clean reset.
+
+## Acceptance Criteria
+
+1.  A new `ai/mcp/server/knowledge-base/services/databaseService.mjs` file is created.
+2.  The service contains a `deleteDatabase` function that connects to ChromaDB and deletes the collection specified in `aiConfig`.
+3.  The function returns a success message upon completion.
+4.  The `toolService.mjs` `serviceMapping` is updated to point the `delete_database` operationId to the new service function.

ai/mcp/server/knowledge-base/services/databaseService.mjs

@@ -0,0 +1,30 @@
+import { ChromaClient } from 'chromadb';
+import aiConfig from '../../../../buildScripts/ai/aiConfig.mjs';
+
+/**
+ * Permanently deletes the entire knowledge base collection from ChromaDB.
+ * This is a destructive operation used for a clean reset.
+ * @returns {Promise<object>} A promise that resolves to a success message.
+ */
+async function deleteDatabase() {
+    const dbClient = new ChromaClient();
+    const collectionName = aiConfig.knowledgeBase.collectionName;
+
+    try {
+        await dbClient.deleteCollection({ name: collectionName });
+        return {
+            message: `Knowledge base collection '${collectionName}' deleted successfully.`
+        };
+    } catch (error) {
+        // ChromaDB throws an error if the collection doesn't exist, which we can treat as a success for this operation.
+        if (error.message.includes(`Collection ${collectionName} does not exist.`)) {
+            return {
+                message: `Knowledge base collection '${collectionName}' did not exist. No action taken.`
+            };
+        }
+        // Re-throw other unexpected errors.
+        throw error;
+    }
+}
+
+export { deleteDatabase };

ai/mcp/server/knowledge-base/services/toolService.mjs

@@ -5,6 +5,7 @@ import { z } from 'zod';
 import { zodToJsonSchema } from 'zod-to-json-schema';
 import { fileURLToPath } from 'url';
 import * as healthService from './healthService.mjs';
+import * as databaseService from './databaseService.mjs';
 
 const __filename      = fileURLToPath(import.meta.url);
 const __dirname       = path.dirname(__filename);
@@ -23,7 +24,7 @@ let allToolsForListing = null;
 const serviceMapping = {
     healthcheck    : healthService.healthcheck,
     sync_database  : async () => 'sync_database not implemented',
-    delete_database: async () => 'delete_database not implemented',
+    delete_database: databaseService.deleteDatabase,
     query_documents: async () => 'query_documents not implemented'
 };