FSM key: {chat_id}.
Scopes FSM state per-chat, shared by all users in that chat. This means:
- All users in a group chat share a single FSM state.
- Useful for group-level conversation flows (e.g., a poll wizard, game sessions).
Key shape
| Update type | Key |
|---|---|
| Any update with a chat | {chat_id} |
| Inline query (no chat) | :error — FSM state is skipped |