Создание чата

backend/app/models/chat.py

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+from sqlalchemy import Column, Integer, String, ForeignKey, DateTime, Boolean, Text
+from sqlalchemy.sql import func
+from sqlalchemy.orm import relationship
+
+from app.database import Base
+
+class Chat(Base):
+    __tablename__ = "chats"
+
+    id = Column(Integer, primary_key=True, index=True)
+    employee_id = Column(Integer, ForeignKey("users.id"), nullable=False, unique=True)
+    admin_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    # Отношения
+    employee = relationship("User", foreign_keys=[employee_id], back_populates="employee_chats")
+    admin = relationship("User", foreign_keys=[admin_id], back_populates="admin_chats")
+    messages = relationship("Message", back_populates="chat", cascade="all, delete-orphan")
+
+class Message(Base):
+    __tablename__ = "messages"
+
+    id = Column(Integer, primary_key=True, index=True)
+    chat_id = Column(Integer, ForeignKey("chats.id", ondelete="CASCADE"), nullable=False)
+    sender_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    content = Column(Text, nullable=False)
+    is_read = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    # Отношения
+    chat = relationship("Chat", back_populates="messages")
+    sender = relationship("User", back_populates="sent_messages")
+    files = relationship("ChatFile", back_populates="message", cascade="all, delete-orphan")
+
+class ChatFile(Base):
+    __tablename__ = "chat_files"
+
+    id = Column(Integer, primary_key=True, index=True)
+    message_id = Column(Integer, ForeignKey("messages.id", ondelete="CASCADE"), nullable=False)
+    file_name = Column(String(255), nullable=False)
+    file_path = Column(String(255), nullable=False)
+    file_size = Column(Integer, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    # Отношения
+    message = relationship("Message", back_populates="files") 

backend/app/models/user.py

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+from sqlalchemy import Boolean, Column, Integer, String
+from sqlalchemy.orm import relationship
+
+from app.database import Base
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True)
+    full_name = Column(String)
+    hashed_password = Column(String)
+    is_active = Column(Boolean, default=True)
+    is_admin = Column(Boolean, default=False)
+
+    # Отношения для чата
+    employee_chats = relationship("Chat", foreign_keys="[Chat.employee_id]", back_populates="employee")
+    admin_chats = relationship("Chat", foreign_keys="[Chat.admin_id]", back_populates="admin")
+    sent_messages = relationship("Message", back_populates="sender")