code: private void storeApplicationSchema(ApplicationDefinition appDef) {
          String appName = appDef.getAppName();
          Tenant tenant = Tenant.getTenant(appDef);
          DBTransaction dbTran = DBService.instance(tenant).startTransaction();
          dbTran.addColumn(SchemaService.APPS_STORE_NAME, appName, COLNAME_APP_SCHEMA, appDef.toDoc().toJSON());
          dbTran.addColumn(SchemaService.APPS_STORE_NAME, appName, COLNAME_APP_SCHEMA_FORMAT, ContentType.APPLICATION_JSON.toString());
          dbTran.addColumn(SchemaService.APPS_STORE_NAME, appName, COLNAME_APP_SCHEMA_VERSION, Integer.toString(CURRENT_SCHEMA_LEVEL));
          DBService.instance(tenant).commit(dbTran);
      }
docs: Store the application row with schema, version, and format.