Lands the table rebuilds migration 026 deferred until a second project exists,
shipped separately from per-project serving for migration hygiene. No behavior
change (deployments stay single-project 'default').
- migration 028_project_scoped_keys.sql: folds project_id into the slug-keyed
PK/UNIQUE of 13 tables (cached_rfcs PK (slug)->(project_id,slug); the
UNIQUE/PK on cached_branches, branch_visibility, branch_contribute_grants,
stars, watches, pr_seen, branch_chat_seen, funder_consents, rfc_collaborators,
contribution_requests, proposed_use_cases gain project_id) and makes the FKs
to cached_rfcs on rfc_invitations/rfc_collaborators/contribution_requests
composite (project_id, rfc_slug) -> cached_rfcs(project_id, slug).
- db.run_migrations: a `-- migrate:no-foreign-keys` migration runs with
PRAGMA foreign_keys toggled OFF around it (required by SQLite's table-rebuild
procedure) + foreign_key_check after, failing loudly on dangling refs.
- ON CONFLICT upsert targets for the rebuilt tables gain project_id so they
match the new composite indexes (value still defaults to 'default').
- test_migration_028_project_scoped_keys.py: proves two-project same-slug
coexistence, within-project uniqueness, composite-FK enforcement. 442 pass.
- design doc §2 marked shipped.
Per docs/superpowers/specs/2026-06-04-m3-backend-planb-design.md.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Ben Stull
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