11 PR5 commits: alembic 0002 (nullable workspace_id + FK + composite
index on 4 business tables) -> backfill_workspace_id.py (3-step
idempotent) -> alembic 0003 (pre-flight refuse + NOT NULL + UNIQUE).
18 new tests (9 alembic 0002+0003 + 9 backfill, including dry-run and
no-users error). 3150 passed + 30 skipped + 16 pre-existing caplog
flake (unchanged from PR4).
T5.11 (ORM nullable=False) deferred to PR6 — flipping the ORM-side
NOT NULL would break 6 INSERT sites whose repository signatures get
workspace_id wiring in PR6 anyway. DB-level invariant is already
enforced by alembic 0003 along the production path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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