A successful OIDC callback now creates a sessions row through the new auth.SessionManager: a random 256-bit ID whose SHA-256 hash is the only stored form, the subject, email, name and groups claims, a separate random CSRF token and created/last_seen/expires timestamps. The ID travels only in the __Host-mealquest_session cookie (HttpOnly, Secure, SameSite=Lax, Path=/, no Domain). SessionFor rejects a session unused for MEALQUEST_SESSION_IDLE or older than MEALQUEST_SESSION_MAX, deletes it, and otherwise slides last_seen_at. POST /auth/logout deletes the row, clears the cookie and redirects to the provider's end_session_endpoint, which discovery now requires. The session lifetimes are optional configuration (defaults 720h and 4320h, per D-004); set values must be positive with MAX at least IDLE. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>