88a6b34c5e
quotes.converted_contract_id and invoices.source_contract_id were
declared with inline FKs to contracts(id), but contracts is created
later in the same migration. SQLite accepted the forward reference;
Postgres rejected it ("relation \"contracts\" does not exist"), which
broke the Schema drift (#530) workflow and any fresh Postgres install.
Same pattern as events.hero_photo_id → photos.id in db.js: declare the
column without a constraint, then add the FK in a separate alterTable
after both sides exist. Wrapped in try/catch so re-runs against a DB
that already has the constraint are a no-op.
Verified locally against the #530 recovery scenario (initializeDatabase
then migrate:safe) and the fresh-install path: both converge cleanly,
both FKs land on the expected tables.