Lets a password change end every session opened before it. Tokens are
stateless JWTs, so this adds users.tokens_valid_after, and lib/auth.ts
refuses a token issued before that time.
f
up(db: DatabaseSync): void
Run once by runMigrations. Existing users start with NULL, which revokes no
token.
Usage
import * as mod from "api/db/migrations/0015_token_revocation.ts";