"""Abstract persistence API for iframe embed session → thread mappings."""

from __future__ import annotations

from abc import ABC, abstractmethod
from typing import Any


class EmbedSessionStore(ABC):
    @abstractmethod
    async def upsert(self, session_id: str, thread_id: str) -> dict[str, Any]:
        """Create or update the mapping for an embed session."""
        raise NotImplementedError

    @abstractmethod
    async def get(self, session_id: str) -> dict[str, Any] | None:
        """Return ``{session_id, thread_id, created_at, updated_at}`` or None."""
        raise NotImplementedError