diff --git a/backend/app/db/session.py b/backend/app/db/session.py
index 1b56b74..b872e66 100644
--- a/backend/app/db/session.py
+++ b/backend/app/db/session.py
@@ -87,7 +87,7 @@ def _warn_on_schema_drift() -> None:
         engine = create_engine(sync_url, pool_pre_ping=True)
         inspector = sa_inspect(engine)
     except Exception as exc:
-        logger.error("schema_drift_check_failed", error=str(exc))
+        logger.error("schema_drift_check_failed: %s", str(exc))
         engine.dispose() if "engine" in dir() else None  # type: ignore[name-defined]
         return
 
@@ -102,15 +102,15 @@ def _warn_on_schema_drift() -> None:
                 if col.name not in db_cols:
                     missing.append(f"COLUMN {table_name}.{col.name}")
     except Exception as exc:
-        logger.error("schema_drift_check_failed", error=str(exc))
+        logger.error("schema_drift_check_failed: %s", str(exc))
     finally:
         engine.dispose()
 
     if missing:
         logger.error(
-            "schema_drift_detected",
-            missing=missing,
-            hint="DB schema does not match models. Run scripts/check_schema.py for details.",
+            "schema_drift_detected: %s (hint: %s)",
+            missing,
+            "DB schema does not match models. Run scripts/check_schema.py for details.",
         )