Combines the Phase 1 tenant isolation chain (064 → ... → 174f442795b7)
with the main sequential chain (064 → ... → 070) into a single Alembic
head (a9f3b2c1d4e5) so `alembic upgrade head` in the Dockerfile works
without ambiguity.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>