fix(mypy): add explicit QueryResult type annotation

Add explicit type annotation to asyncio.wait_for result
to satisfy mypy's no-any-return check.

Author: Sakeeb91

db/executor.py

@@ -234,7 +234,7 @@ async def execute(
 
         try:
             # Execute with timeout
-            result = await asyncio.wait_for(
+            result: QueryResult = await asyncio.wait_for(
                 self._execute_query(sql, params),
                 timeout=timeout,
             )