fix: make with_session rollback only on SQLAlchemy errors (#5865)

* fix: remove unnecessary session commit in DatabaseService

* fix: improve error logging in DatabaseService session management

* fix: enhance error handling in DatabaseService session management by specifying SQLAlchemyError

src/backend/base/langflow/services/database/service.py

@@ -14,7 +14,7 @@ import sqlalchemy as sa
 from alembic import command, util
 from alembic.config import Config
 from loguru import logger
-from sqlalchemy import event, inspect
+from sqlalchemy import event, exc, inspect
 from sqlalchemy.dialects import sqlite as dialect_sqlite
 from sqlalchemy.engine import Engine
 from sqlalchemy.exc import OperationalError
@@ -148,12 +148,11 @@ class DatabaseService(Service):
     @asynccontextmanager
     async def with_session(self):
         async with AsyncSession(self.engine, expire_on_commit=False) as session:
+            # Start of Selection
             try:
                 yield session
-                if session.is_active:
-                    await session.commit()
-            except Exception:
-                logger.error("An error occurred during the session scope")
+            except exc.SQLAlchemyError as db_exc:
+                logger.error(f"Database error during session scope: {db_exc}")
                 await session.rollback()
                 raise