/auth/logout previously only cleared the client's cookie, leaving the
session token valid in the sessions table — a stolen cookie captured
before logout would still work afterwards. Add BackendDbInterface#deleteSession
(implemented in SqliteInterface) and call it from the logout route using
the session token from the cookie. Caught by the new auth-http.test.ts
integration test, updated to assert the session is actually invalidated.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
codingetandClaude
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