Stateless JWTs had no revocation path: a stolen token stayed valid for
its full 24h even after the victim changed their password, and there was
no logout. This lays the foundation for revoking them.
- User.tokens_valid_from: per-user bulk-revocation cutoff (compared against
the token's iat). RevokedToken(jti PK, exp): single-token denylist, pruned
opportunistically on insert so it never outgrows live-but-revoked tokens.
- login() now mints a jti; create_access_token already stamps iat/exp.
- repo.revoke_token / is_token_revoked / set_tokens_valid_from (abstract +
shared sqlmodel impl + DummyRepo coverage stubs).
- Centralized validate path in dependencies.py: every auth dependency now
resolves the user and fails closed on (1) missing jti (legacy/pre-deploy
token -> one forced re-login), (2) iat before the cutoff, (3) a denylisted
jti. Denylist lookups ride a 10s membership cache mirroring the user cache.
- Contract/fuzz harness seeds its fixed-uuid principal under
DECNET_CONTRACT_TEST so its minted token resolves to a live admin user.
anti
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