Remove undefined as default value for namespace

framework/src/controller/migrations/sql/define_schema.sql

@@ -26,18 +26,18 @@ CREATE TABLE IF NOT EXISTS "migrations"(
 );
 
 -- Add new column `namespace` to identify migration's groups
-ALTER TABLE "migrations" ADD COLUMN IF NOT EXISTS "namespace" TEXT NOT NULL DEFAULT 'undefined';
-
--- Make `namespace` column composite primary key along with `id`
-ALTER TABLE "migrations" DROP CONSTRAINT IF EXISTS "migrations_pkey";
-ALTER TABLE "migrations" ADD CONSTRAINT "migrations_pkey" PRIMARY KEY ("id", "namespace");
+ALTER TABLE "migrations" ADD COLUMN IF NOT EXISTS "namespace" TEXT;
 
 -- Remove framework-related migration (20180205000000_underscore_patch.sql)
 DELETE FROM "migrations" WHERE id = '20180205000000' AND name = 'underscore_patch';
 
 -- Populate `namespace` with correct initial values when it exists
-UPDATE "migrations" SET namespace = 'network' WHERE namespace = 'undefined' AND id IN ('20161016133824', '20170113181857', '20171207000001', '20171227155620', '20180205000002', '20180327170000', '20181106000006', '20190103000001', '20190111111557');
-UPDATE "migrations" SET namespace = 'chain' WHERE namespace = 'undefined';
+UPDATE "migrations" SET namespace = 'network' WHERE namespace IS NULL AND id IN ('20161016133824', '20170113181857', '20171207000001', '20171227155620', '20180205000002', '20180327170000', '20181106000006', '20190103000001', '20190111111557');
+UPDATE "migrations" SET namespace = 'chain' WHERE namespace IS NULL;
+
+-- Make `namespace` column composite primary key along with `id`
+ALTER TABLE "migrations" DROP CONSTRAINT IF EXISTS "migrations_pkey";
+ALTER TABLE "migrations" ADD CONSTRAINT "migrations_pkey" PRIMARY KEY ("id", "namespace");
 
 -- Duplicate 20160723182900_create_schema.sql migration for `network` module if migration exists for `chain` module
 -- That is required because 20160723182900_create_schema.sql was splited into two different files (one for each module)

framework/test/mocha/unit/modules/chain/components/storage/entities/migration.js

@@ -101,6 +101,7 @@ describe('Migration', () => {
 		validMigration = {
 			id: '30200723182900',
 			name: 'create_schema',
+			namespace: 'module_name',
 		};
 
 		adapter = storage.adapter;