"""ORM model for iframe embed session → thread lookups."""

from __future__ import annotations

from datetime import UTC, datetime

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

from deerflow.persistence.base import Base
from deerflow.persistence.types import BeijingDateTime


class EmbedSessionRow(Base):
    __tablename__ = "embed_sessions"

    # Opaque id generated by the parent page and passed into the iframe URL.
    session_id: Mapped[str] = mapped_column(String(128), primary_key=True)
    thread_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    created_at: Mapped[datetime] = mapped_column(BeijingDateTime(), nullable=False, default=lambda: datetime.now(UTC))
    updated_at: Mapped[datetime] = mapped_column(BeijingDateTime(), nullable=False, default=lambda: datetime.now(UTC))