feat: add platform singleton flag to metaschema_public.database

packages/metaschema-schema/Makefile

@@ -1,5 +1,5 @@
 EXTENSION = metaschema-schema
-DATA = sql/metaschema-schema--0.15.5.sql
+DATA = sql/metaschema-schema--0.31.0.sql
 
 PG_CONFIG = pg_config
 PGXS := $(shell $(PG_CONFIG) --pgxs)

packages/metaschema-schema/deploy/schemas/metaschema_public/tables/database/table.sql

@@ -14,6 +14,10 @@ CREATE TABLE metaschema_public.database (
 
   hash uuid,
 
+  -- Singleton flag marking the platform (constructive) database itself.
+  -- Write-once: first row to set it wins; immutable once true.
+  platform boolean NOT NULL DEFAULT false,
+
   created_at timestamptz DEFAULT now(),
   updated_at timestamptz DEFAULT now(),
 
@@ -23,6 +27,10 @@ CREATE TABLE metaschema_public.database (
 ALTER TABLE metaschema_public.database
   ADD CONSTRAINT db_namechk CHECK (char_length(name) > 2);
 
+CREATE UNIQUE INDEX databases_database_platform_singleton_idx
+  ON metaschema_public.database (platform)
+  WHERE platform;
+
 COMMENT ON COLUMN metaschema_public.database.schema_hash IS '@omit';
 
 COMMIT;

packages/metaschema-schema/metaschema-schema.control

@@ -1,6 +1,6 @@
 # metaschema-schema extension
 comment = 'metaschema-schema extension'
-default_version = '0.15.5'
+default_version = '0.31.0'
 module_pathname = '$libdir/metaschema-schema'
 requires = 'citext,hstore,pgpm-inflection,pgpm-database-jobs,pgpm-types,pgcrypto,plpgsql,postgis,uuid-ossp,pgpm-verify'
 relocatable = false

packages/metaschema-schema/sql/metaschema-schema--0.15.5.sql → packages/metaschema-schema/sql/metaschema-schema--0.31.0.sql

@@ -36,6 +36,7 @@ CREATE TABLE metaschema_public.database (
   name text,
   label text,
   hash uuid,
+  platform boolean NOT NULL DEFAULT false,
   created_at timestamptz DEFAULT now(),
   updated_at timestamptz DEFAULT now(),
   UNIQUE (schema_hash)
@@ -45,6 +46,8 @@ ALTER TABLE metaschema_public.database
   ADD CONSTRAINT db_namechk 
     CHECK (char_length(name) > 2);
 
+CREATE UNIQUE INDEX databases_database_platform_singleton_idx ON metaschema_public.database (platform) WHERE platform;
+
 COMMENT ON COLUMN metaschema_public.database.schema_hash IS '@omit';
 
 CREATE TABLE metaschema_public.schema (

packages/metaschema-schema/verify/schemas/metaschema_public/tables/database/table.sql

@@ -2,5 +2,6 @@
 BEGIN;
 
 SELECT verify_table ('metaschema_public.database');
+SELECT verify_index ('metaschema_public.database', 'databases_database_platform_singleton_idx');
 
 ROLLBACK;

packages/services/__tests__/__snapshots__/services.test.ts.snap

@@ -8,6 +8,7 @@ exports[`services functionality should handle complete meta workflow with servic
   "label": null,
   "name": "my-meta-db",
   "owner_id": "[ID]",
+  "platform": false,
   "schema_hash": null,
   "updated_at": "[DATE]",
 }