# sqlalchemy.exc.InvalidRequestError: This session is in 'expired' state. No further SQL can be emitted within this transaction.

- **ID:** `python/sqlalchemy-exc-invalid-request-session-expired`
- **Domain:** python
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The session has been expired due to a rollback or close, and attempting to execute SQL on it raises this error.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |

## Workarounds

1. **Close and create new session** (95% success)
   ```
   Close the expired session and create a new one: session.close(); session = Session()
   ```
2. **Start new transaction** (80% success)
   ```
   Use session.begin() to start a new transaction if the session is still in a recoverable state.
   ```

## Dead Ends

- **Using expire_all() to revive session** —  (70% fail)
- **Creating new session without closing old** —  (50% fail)