remove unused imports (#471)

Co-authored-by: Micheal Gendy <micheal@sonono.ch>

Author: Mng-dev-ai

databases/backends/postgres.py

@@ -1,6 +1,5 @@
 import logging
 import typing
-from collections.abc import Sequence
 
 import asyncpg
 from sqlalchemy.dialects.postgresql import pypostgresql

databases/core.py

@@ -11,12 +11,7 @@
 from sqlalchemy.sql import ClauseElement
 
 from databases.importer import import_from_string
-from databases.interfaces import (
-    ConnectionBackend,
-    DatabaseBackend,
-    Record,
-    TransactionBackend,
-)
+from databases.interfaces import DatabaseBackend, Record
 
 if sys.version_info >= (3, 7):  # pragma: no cover
     import contextvars as contextvars