code: private void storeTenantDefinition(TenantDefinition tenantDef) {
          String tenantDefJSON = tenantDef.toDoc().toJSON();
          DBTransaction dbTran = DBService.instance().startTransaction();
          dbTran.addColumn(TENANTS_STORE_NAME, tenantDef.getName(), TENANT_DEF_COL_NAME, tenantDefJSON);
          DBService.instance().commit(dbTran);
      }
docs: Store the given tenant definition the Tenants table in the default database.