diff --git a/backend/app/database.py b/backend/app/database.py
index d6f6673..1e6a3c7 100644
--- a/backend/app/database.py
+++ b/backend/app/database.py
@@ -347,6 +347,7 @@ def _run_migrations():
                 conn.execute(text(migration))
                 conn.commit()
             except Exception as e:
+                conn.rollback()
                 logger.warning(f"Migration failed (may already be applied): {e}")