Postgres: Properly initialize database on startup and debugger (#7255)

* PG: Properly initialize database

* fix flaky tests

* flaky test

* correct test

* no idea

* clean up debugger

spec/Schema.spec.js

@@ -28,6 +28,7 @@ describe('SchemaController', () => {
   afterEach(async () => {
     await config.database.schemaCache.clear();
     await TestUtils.destroyAllDataPermanently(false);
+    await config.database.adapter.performInitialization({ VolatileClassesSchemas: [] });
   });
 
   it('can validate one object', done => {