add exception error cases

app/database/session.py

@@ -132,12 +132,21 @@ async def get_session() -> AsyncGenerator[AsyncSession, None]:
         try:
             yield session
         except Exception as e:
-            import traceback
+            from fastapi import HTTPException
             await session.rollback()
+            duration = (time.perf_counter() - start_time) * 1000
+            # 클라이언트 에러(4xx)는 WARNING, 서버 에러(5xx)는 ERROR로 구분
+            if isinstance(e, HTTPException) and e.status_code < 500:
+                logger.warning(
+                    f"[get_session] ROLLBACK ({e.status_code}) - "
+                    f"error: {type(e).__name__}: {e}, duration: {duration:.1f}ms"
+                )
+            else:
+                import traceback
                 logger.error(traceback.format_exc())
                 logger.error(
                     f"[get_session] ROLLBACK - error: {type(e).__name__}: {e}, "
-                f"duration: {(time.perf_counter() - start_time)*1000:.1f}ms"
+                    f"duration: {duration:.1f}ms"
                 )
             raise e
         finally: