feat(pgsql): unique constraints on apply, matching unique index names, FK deferral

- migration writer now emits unique constraints (direct apply and live diff
  previously dropped them); idempotent via the existing DO block
- unique constraint adopts a same-named model unique index with
  ADD CONSTRAINT ... UNIQUE USING INDEX instead of building a second index
- dbml reader names unnamed unique indexes ukey_<table>_<cols> to match the
  unique constraint naming
- foreign key deferral: Constraint.Deferrable/InitiallyDeferred are *bool
  (nil = unspecified, never diffed); writers emit DEFERRABLE, DEFERRABLE
  INITIALLY DEFERRED and NOT DEFERRABLE; live reader reads condeferrable and
  condeferred; dbml reader/writer support deferrable and initially deferred
- tests and README/naming docs updated

This commit is contained in:

warkanum

2026-10-08 00:07:49 +02:00

parent 20f8dd82b6

commit b4f18f088b

20 changed files with 756 additions and 36 deletions

									
										pkg/writers/pgsql/templates/create_foreign_key.tmpl
									
		+1
		-1
	
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				@@ -7,4 +7,4 @@ ALTER TABLE {{qual_table .SchemaName .TableName}}

				  REFERENCES {{qual_table .TargetSchema .TargetTable}} ({{.TargetColumns}})

				  ON DELETE {{.OnDelete}}

				  ON UPDATE {{.OnUpdate}}

				  DEFERRABLE;

				  {{.Deferral}};