Начальный этап бота с выдачей ключей

database.py

@@ -0,0 +1,38 @@
+from sqlalchemy import create_engine, Column, Integer, String, DateTime
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+import datetime
+
+DATABASE_URL = 'sqlite:///vpn_users.db'
+
+engine = create_engine(DATABASE_URL)
+Session = sessionmaker(bind=engine)
+session = Session()
+Base = declarative_base()
+
+class VPNUser(Base):
+    __tablename__ = 'vpn_users'
+    
+    id = Column(Integer, primary_key=True)
+    telegram_id = Column(Integer, unique=True)
+    username = Column(String)
+    subscription_end = Column(DateTime)
+    access_key = Column(String)
+
+Base.metadata.create_all(engine)
+
+def add_user(telegram_id, username, access_key):
+    user = VPNUser(telegram_id=telegram_id, username=username, 
+                   subscription_end=datetime.datetime.now() + datetime.timedelta(days=30),
+                   access_key=access_key)
+    session.add(user)
+    session.commit()
+
+def get_user(telegram_id):
+    return session.query(VPNUser).filter(VPNUser.telegram_id == telegram_id).first()
+
+def update_subscription(telegram_id, days):
+    user = get_user(telegram_id)
+    if user:
+        user.subscription_end += datetime.timedelta(days=days)
+        session.commit()