Fix linter errors

Author: matdev83

.flake8

@@ -0,0 +1,3 @@
+[flake8]
+exclude = .venv
+ignore = E501

setup.py

@@ -1,4 +1,4 @@
 from setuptools import setup
 
 if __name__ == "__main__":
-    setup() 
+    setup()

src/llm_accounting/models/__init__.py

@@ -1 +0,0 @@
-

src/llm_accounting/models/request.py

@@ -7,6 +7,7 @@
 
 # Removed: from sqlalchemy.ext.declarative import declarative_base # Redundant
 
+
 class APIRequest(Base):
     __tablename__ = "api_requests"
 

tests/accounting/test_global_limits.py

@@ -1,8 +1,6 @@
-from datetime import datetime, timedelta, timezone
+from datetime import datetime, timezone
 
 import pytest
-from sqlalchemy import create_engine
-from sqlalchemy.orm import sessionmaker
 
 from llm_accounting import LLMAccounting
 from llm_accounting.backends.sqlite import SQLiteBackend

tests/accounting/test_model_limits.py

@@ -4,10 +4,8 @@
 
 from llm_accounting import LLMAccounting
 from llm_accounting.backends.sqlite import SQLiteBackend
-from llm_accounting.models.base import Base
 from llm_accounting.models.limits import (LimitScope, LimitType, TimeInterval,
                                           UsageLimit)
-from llm_accounting.models.request import APIRequest
 
 
 @pytest.fixture

tests/accounting/test_user_caller_limits.py

@@ -4,10 +4,8 @@
 
 from llm_accounting import LLMAccounting
 from llm_accounting.backends.sqlite import SQLiteBackend
-from llm_accounting.models.base import Base
 from llm_accounting.models.limits import (LimitScope, LimitType, TimeInterval,
                                           UsageLimit)
-from llm_accounting.models.request import APIRequest
 
 
 @pytest.fixture