- turned model_variables into a class with lazy loading

- some improvements to Healthchecks

eveai_app/__init__.py

@@ -10,6 +10,8 @@ from common.extensions import (db, migrate, bootstrap, security, mail, login_man
                                minio_client, simple_encryption, metrics)
 from common.models.user import User, Role, Tenant, TenantDomain
 import common.models.interaction
+import common.models.monitoring
+import common.models.document
 from common.utils.nginx_utils import prefixed_url_for
 from config.logging_config import LOGGING
 from common.utils.security import set_tenant_session_data