from __future__ import annotations

from sqlalchemy import Text
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base import Base


class ChatSession(Base):
    __tablename__ = "chat_session"

    session_id: Mapped[str] = mapped_column(Text, primary_key=True)
    tenant_id: Mapped[str] = mapped_column(Text, nullable=False, index=True)
    channel: Mapped[str] = mapped_column(Text, nullable=False)
    title: Mapped[str | None] = mapped_column(Text, nullable=True)
    last_task_id: Mapped[str | None] = mapped_column(Text, nullable=True)
    context_json: Mapped[str] = mapped_column(Text, nullable=False)
    created_at: Mapped[str] = mapped_column(Text, nullable=False)
    updated_at: Mapped[str] = mapped_column(Text, nullable=False)