bot rafactor and bugfix

app/models/bot.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 from datetime import datetime
-from sqlalchemy import ForeignKey, String, func, DateTime
+from sqlalchemy import ForeignKey, String, func, DateTime, Column
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from app.db.session import Base
 
@@ -8,6 +8,7 @@ class Bot(Base):
     __tablename__ = "bots"
 
     id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    bot_id: Mapped[int] = mapped_column()  # Telegram bot ID
     owner_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"))
     name: Mapped[str] = mapped_column(String(64))
     username: Mapped[str | None] = mapped_column(String(64))
@@ -15,3 +16,4 @@ class Bot(Base):
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
 
     owner = relationship("User")
+    channels = relationship("Channel", back_populates="bot")