Every fresh Claude.ai authorization died at POST /api/mcp-oauth/token
with a silent 500: the multi-tenant refactor's dynamic loop
(20260330130000, line ~250) set company_id NOT NULL on api_keys, and the
companyless key insert from the popup-signup flow (#1814) violates it.
Nothing exercised the real insert before (unit tests mock the client;
no pg test inserted an unbound key), so repo, CI and prod all agreed and
all were wrong. DROP NOT NULL, log the insert/rotation failures at the
token endpoint, and pin the unbound insert + lazy bind on real Postgres.
Claude-Session: https://claude.ai/code/session_018wCdzRTatKiDByKB8hCNT6
Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
