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database.py

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+"""Database models and session management."""
+from typing import Generator
+from sqlalchemy import create_engine, BigInteger, String, Integer, Boolean, ForeignKey, Column
+from sqlalchemy.orm import declarative_base, sessionmaker, relationship, Session
+from sqlalchemy.schema import UniqueConstraint
+from config import Config
+
+Base = declarative_base()
+
+
+class User(Base):
+    """User model - stores user information and birthday."""
+    __tablename__ = "users"
+    
+    user_id = Column(BigInteger, primary_key=True)
+    username = Column(String, nullable=True)
+    first_name = Column(String, nullable=False)
+    birthday_day = Column(Integer, nullable=False)
+    birthday_month = Column(Integer, nullable=False)
+    birthday_year = Column(Integer, nullable=True)
+    preference_theme = Column(String, nullable=False)
+    
+    # Relationships
+    chats = relationship("UserChat", back_populates="user", cascade="all, delete-orphan")
+    
+    def __repr__(self):
+        return f"<User(user_id={self.user_id}, first_name={self.first_name})>"
+
+
+class Chat(Base):
+    """Chat model - stores chat information."""
+    __tablename__ = "chats"
+    
+    chat_id = Column(BigInteger, primary_key=True)
+    chat_title = Column(String, nullable=False)
+    bot_is_admin = Column(Boolean, default=False, nullable=False)
+    
+    # Relationships
+    users = relationship("UserChat", back_populates="chat", cascade="all, delete-orphan")
+    
+    def __repr__(self):
+        return f"<Chat(chat_id={self.chat_id}, chat_title={self.chat_title})>"
+
+
+class UserChat(Base):
+    """Many-to-many relationship between users and chats."""
+    __tablename__ = "user_chats"
+    
+    user_id = Column(BigInteger, ForeignKey("users.user_id"), primary_key=True)
+    chat_id = Column(BigInteger, ForeignKey("chats.chat_id"), primary_key=True)
+    
+    # Relationships
+    user = relationship("User", back_populates="chats")
+    chat = relationship("Chat", back_populates="users")
+    
+    __table_args__ = (
+        UniqueConstraint("user_id", "chat_id", name="unique_user_chat"),
+    )
+    
+    def __repr__(self):
+        return f"<UserChat(user_id={self.user_id}, chat_id={self.chat_id})>"
+
+
+# Database engine and session
+engine = create_engine(Config.DATABASE_URL, echo=False)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db() -> Generator[Session, None, None]:
+    """Get database session."""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def init_db() -> None:
+    """Initialize database - create all tables."""
+    Base.metadata.create_all(bind=engine)
+
+
+def get_db_session() -> Session:
+    """Get a database session (for use without context manager)."""
+    return SessionLocal()