before send to remote

env/lib/python3.8/site-packages/django/db/backends/dummy/base.py

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+"""
+Dummy database backend for Django.
+
+Django uses this if the database ENGINE setting is empty (None or empty string).
+
+Each of these API functions, except connection.close(), raise
+ImproperlyConfigured.
+"""
+
+from django.core.exceptions import ImproperlyConfigured
+from django.db.backends.base.base import BaseDatabaseWrapper
+from django.db.backends.base.client import BaseDatabaseClient
+from django.db.backends.base.creation import BaseDatabaseCreation
+from django.db.backends.base.introspection import BaseDatabaseIntrospection
+from django.db.backends.base.operations import BaseDatabaseOperations
+from django.db.backends.dummy.features import DummyDatabaseFeatures
+
+
+def complain(*args, **kwargs):
+    raise ImproperlyConfigured(
+        "settings.DATABASES is improperly configured. "
+        "Please supply the ENGINE value. Check "
+        "settings documentation for more details."
+    )
+
+
+def ignore(*args, **kwargs):
+    pass
+
+
+class DatabaseOperations(BaseDatabaseOperations):
+    quote_name = complain
+
+
+class DatabaseClient(BaseDatabaseClient):
+    runshell = complain
+
+
+class DatabaseCreation(BaseDatabaseCreation):
+    create_test_db = ignore
+    destroy_test_db = ignore
+
+
+class DatabaseIntrospection(BaseDatabaseIntrospection):
+    get_table_list = complain
+    get_table_description = complain
+    get_relations = complain
+    get_indexes = complain
+
+
+class DatabaseWrapper(BaseDatabaseWrapper):
+    operators = {}
+    # Override the base class implementations with null
+    # implementations. Anything that tries to actually
+    # do something raises complain; anything that tries
+    # to rollback or undo something raises ignore.
+    _cursor = complain
+    ensure_connection = complain
+    _commit = complain
+    _rollback = ignore
+    _close = ignore
+    _savepoint = ignore
+    _savepoint_commit = complain
+    _savepoint_rollback = ignore
+    _set_autocommit = complain
+    # Classes instantiated in __init__().
+    client_class = DatabaseClient
+    creation_class = DatabaseCreation
+    features_class = DummyDatabaseFeatures
+    introspection_class = DatabaseIntrospection
+    ops_class = DatabaseOperations
+
+    def is_usable(self):
+        return True

env/lib/python3.8/site-packages/django/db/backends/dummy/features.py

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+from django.db.backends.base.features import BaseDatabaseFeatures
+
+
+class DummyDatabaseFeatures(BaseDatabaseFeatures):
+    supports_transactions = False
+    uses_savepoints = False