add logs in session middleware

middlewares/session.py

@@ -15,7 +15,24 @@ class SessionMiddleware(BaseMiddleware):
         data["session"] = session
         try:
             result = await handler(event, data)
-            await session.commit()
+            try:
+                await session.commit()
+            except Exception as commit_err:
+                handler_name = getattr(handler, "__qualname__", getattr(handler, "__name__", str(handler)))
+                event_type = type(event).__name__
+                logger.warning(
+                    "Session commit failed, rollback performed — handler=%s, event=%s, error=%s: %s",
+                    handler_name,
+                    event_type,
+                    type(commit_err).__name__,
+                    commit_err,
+                    exc_info=True,
+                )
+                try:
+                    await session.rollback()
+                except Exception:
+                    pass
+                raise commit_err
             return result
         except Exception as e:
             handler_name = getattr(handler, "__qualname__", getattr(handler, "__name__", str(handler)))