init

app/models.py

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+from sqlalchemy import Column, Integer, String, ForeignKey, Text, DateTime, func
+from sqlalchemy.orm import relationship
+from app.database import Base
+
+class User(Base):
+    __tablename__ = "users"
+    id = Column(Integer, primary_key=True, index=True)
+    telegram_id = Column(String, unique=True, index=True)
+    username = Column(String, nullable=True)
+
+    chats = relationship("Chat", back_populates="owner")
+
+
+class Chat(Base):
+    __tablename__ = "chats"
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, default="Новый чат")
+
+    owner_id = Column(Integer, ForeignKey("users.id"))
+    owner = relationship("User", back_populates="chats")
+
+    messages = relationship("Message", back_populates="chat", cascade="all, delete-orphan")
+
+
+class Message(Base):
+    __tablename__ = "messages"
+    id = Column(Integer, primary_key=True, index=True)
+    role = Column(String)  # 'user' | 'assistant' | 'system'
+    content = Column(Text)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    chat_id = Column(Integer, ForeignKey("chats.id"))
+    chat = relationship("Chat", back_populates="messages")