modified: backend/.env.example

new file:   backend/src/controllers/sqlInterfaceController.ts
	new file:   backend/src/routes/sqlInterface.ts
	modified:   backend/src/server.ts
	modified:   docker-compose.external-db.yml
	modified:   frontend/src/App.tsx
	modified:   frontend/src/components/Sidebar.tsx
	new file:   frontend/src/pages/SqlInterface.tsx
	modified:   frontend/src/services/api.ts

frontend/src/services/api.ts

@@ -168,4 +168,23 @@ export const databasesApi = {
     api.get<{ schema: any[] }>(`/databases/${databaseId}/tables/${tableName}/schema`),
 };
 
+// SQL Interface API
+export interface SqlQueryResult {
+  success: boolean;
+  data?: any[];
+  rowCount?: number;
+  fields?: { name: string; dataTypeID: number }[];
+  executionTime?: number;
+  command?: string;
+  error?: string;
+  position?: number;
+  detail?: string;
+  hint?: string;
+}
+
+export const sqlInterfaceApi = {
+  execute: (databaseId: string, query: string) =>
+    api.post<SqlQueryResult>('/sql/execute', { database_id: databaseId, query }),
+};
+
 export default api;