Boots a fresh Postgres via sqlx::test, applies every migration in
order, dumps the resulting public schema (tables, columns with type
+ nullability + default, indexes, constraints, applied migration
manifest), and compares against a checked-in golden text file.
What this catches:
* Someone edits a committed migration — schema diverges from the
snapshot, test fails with a precise diff.
* Someone adds a migration but forgets to update the snapshot —
same divergence; test reminds them.
* Two migrations drift apart in any other way — snapshot is the
source of truth about the post-replay schema.
Update workflow when adding a migration intentionally:
BLESS=1 DATABASE_URL=postgres://... \
cargo test -p picloud-manager-core --test schema_snapshot \
-- --include-ignored
Review the snapshot diff in the same PR. The header comment makes
it clear the file is not for hand-editing.
* Snapshot dump uses information_schema.columns + pg_indexes +
pg_constraint with pg_get_constraintdef. Output is sorted on
every dimension so cosmetic differences (insertion order,
etc.) never cause spurious diffs.
* #[ignore]'d by default for the same reason as the integration
tests — needs DATABASE_URL pointing at a writable Postgres.
* Initial expected_schema.txt blessed from the current
migrations/ contents (3 tables, 9 indexes, 12 constraints).
Wires up enforcement item (4) from docs/versioning.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
