diff --git a/planetmint/__init__.py b/planetmint/__init__.py
index 8bed969..a3635f5 100644
--- a/planetmint/__init__.py
+++ b/planetmint/__init__.py
@@ -6,7 +6,7 @@
 import copy
 import logging
 import os
-
+from planetmint.migrations.chain_migration_election import ChainMigrationElection
 from planetmint.log import DEFAULT_LOGGING_CONFIG as log_config
 from planetmint.version import __version__  # noqa
 
diff --git a/planetmint/backend/__init__.py b/planetmint/backend/__init__.py
index 7a2d9ee..4f55715 100644
--- a/planetmint/backend/__init__.py
+++ b/planetmint/backend/__init__.py
@@ -13,5 +13,4 @@ configuration or the ``PLANETMINT_DATABASE_BACKEND`` environment variable.
 
 # Include the backend interfaces
 from planetmint.backend import schema, query  # noqa
-
 from planetmint.backend.connection import Connection
diff --git a/planetmint/backend/connection.py b/planetmint/backend/connection.py
index a1b5d26..44e8257 100644
--- a/planetmint/backend/connection.py
+++ b/planetmint/backend/connection.py
@@ -3,29 +3,22 @@
 # SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
 # Code is Apache-2.0 and docs are CC-BY-4.0
 
-import sys
 import logging
 from importlib import import_module
-from itertools import repeat
 
-from planetmint.backend.exceptions import ConnectionError
-from planetmint.backend.utils import get_planetmint_config_value, get_planetmint_config_value_or_key_error
-from planetmint.common.exceptions import ConfigurationError
+from planetmint.backend.utils import get_planetmint_config_value
 
 BACKENDS = {  # This is path to MongoDBClass
-    'tarantool_db': 'planetmint.backend.tarantool.connection.TarantoolDB',
+    'tarantool_db': r'planetmint.backend.tarantool.connection.TarantoolDB',
     'localmongodb': 'planetmint.backend.localmongodb.connection.LocalMongoDBConnection'
 }
 
 logger = logging.getLogger(__name__)
 
-
-modulename = sys.modules[__name__]
 backend = get_planetmint_config_value("backend")
-current_backend = getattr(modulename, BACKENDS[backend])
+modulepath, _, class_name = BACKENDS[backend].rpartition('.')
+current_backend = getattr(import_module(modulepath), class_name)
 
 
 class Connection(current_backend):
     pass
-
-
diff --git a/planetmint/backend/tarantool/__init__.py b/planetmint/backend/tarantool/__init__.py
index 1e23321..3a26cf5 100644
--- a/planetmint/backend/tarantool/__init__.py
+++ b/planetmint/backend/tarantool/__init__.py
@@ -1,5 +1,5 @@
 # Register the single dispatched modules on import.
-from planetmint.backend.tarantool import schema, query, connection # noqa
+from planetmint.backend.tarantool import query, connection # noqa
 
 # MongoDBConnection should always be accessed via
 # ``planetmint.backend.connect()``.
\ No newline at end of file
diff --git a/planetmint/backend/tarantool/query.py b/planetmint/backend/tarantool/query.py
index 414c672..b19165c 100644
--- a/planetmint/backend/tarantool/query.py
+++ b/planetmint/backend/tarantool/query.py
@@ -10,12 +10,10 @@ from pymongo import DESCENDING
 from secrets import token_hex
 from operator import itemgetter
 
-from planetmint import backend
-from planetmint.backend.exceptions import DuplicateKeyError
+from planetmint.backend import query
 from planetmint.backend.utils import module_dispatch_registrar
-from planetmint.common.transaction import Transaction
 
-register_query = module_dispatch_registrar(backend.query)
+register_query = module_dispatch_registrar(query)
 
 
 def _group_transaction_by_ids(txids: list, connection):