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Multiple paths through _user_api_key_auth_builder returned a UserAPIKeyAuth without running common_checks(): OAuth2 token validation, OAuth2 proxy header hook, JWT admin shortcut, master_key path, pass-through custom headers, the /user/auth route, and the allow_requests_on_db_unavailable fallback. An operator-configured key model-access list, max_budget, team_blocked flag, or team model scope was therefore silently skipped on those paths. The HA-fallback token was worse: it was a full proxy-admin synthetic, so a DB outage granted full admin to every caller. Fix three root causes (VERIA-18): 1. Centralize common_checks in the user_api_key_auth wrapper. The builder paths no longer call it; the wrapper runs it once after the builder returns, for every path. Introduces _run_centralized_common_checks which gathers team/user/project/end_user/global_spend context in parallel via asyncio.gather. Preserves the existing custom_auth_run_common_checks opt-out for custom-auth deployments. 2. Narrow is_database_connection_error — drop the blanket PrismaError catch that routed data-layer errors (UniqueViolationError, etc.) into the HA fallback. Only real connectivity failures plus the no_db_connection marker now qualify. 3. DB-unavailable fallback issues an INTERNAL_USER token with user_id DB_UNAVAILABLE_FALLBACK_USER_ID instead of proxy-admin. An outage can no longer escalate an anonymous caller. JWT admin / master_key tokens still grant admin via a synthesized admin user_object (so non_proxy_admin_allowed_routes_check in common_checks recognizes them); other common_checks branches (team_blocked, team_model_access) now apply uniformly.