fix(pg-delta): support PostgreSQL 18 temporal constraints in extraction and diffing

[Copilot]

PostgreSQL 18 adds temporal constraint semantics (WITHOUT OVERLAPS / PERIOD) that were not represented in pg-delta’s table constraint model. As a result, temporal and non-temporal constraint variants could compare as unchanged even when their semantics differed.

• Constraint model + extraction

  • Add is_temporal to table constraint props.
  • Extract temporal metadata from pg_constraint.conperiod in a version-safe way using to_jsonb(c)->>'conperiod', defaulting to false on older PostgreSQL versions.
  • Preserve temporal constraint definitions through catalog export/introspection.

• Constraint diffing

  • Include is_temporal in table constraint comparison.
  • Temporal ↔ non-temporal transitions now produce a drop/recreate path instead of a no-op.

• PostgreSQL 18 coverage

  • Add catalog extraction coverage for temporal primary keys and foreign keys.
  • Add PG18 roundtrip coverage for:
    • converting a regular primary key to WITHOUT OVERLAPS
    • creating a temporal foreign key using PERIOD

• Release note

  • Add a pg-delta patch changeset for PostgreSQL 18 temporal constraint support.

Example of the newly covered DDL:

CREATE TABLE test_schema.bookings (
  room_id integer NOT NULL,
  booking_period tstzrange NOT NULL,
  CONSTRAINT bookings_pkey
    PRIMARY KEY (room_id, booking_period WITHOUT OVERLAPS)
);

ALTER TABLE test_schema.booking_audit
  ADD CONSTRAINT booking_audit_room_id_booking_period_fkey
  FOREIGN KEY (room_id, PERIOD booking_period)
  REFERENCES test_schema.bookings (room_id, PERIOD booking_period);

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[changeset-bot]

🦋 Changeset detected

Latest commit: b887413

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@supabase/pg-delta	Patch

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