- Rotation claims the old token with a conditional update; of two
concurrent refreshes only one gets a successor, so a stolen token cannot
fork into two live sessions.
- A token rotated out less than 10 s ago (parallel tab) is refused without
revoking every session; later reuse still revokes them all.
- Sessions end at most SESSION_MAX_AGE (default 7 days) after login: the
login time is inherited by every rotated token and caps its expiry.
- The refresh cookie is cleared with the same attributes it was set with.
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>