"""Abstract base adapter for memory storage."""
from __future__ import annotations
import abc
from typing import Optional
from tidbits_memory.models import Memory
class BaseAdapter(abc.ABC):
"""Interface that all storage adapters must implement."""
@abc.abstractmethod
def save(self, memory: Memory) -> None:
"""Save or update a memory entry."""
@abc.abstractmethod
def get(self, memory_id: str) -> Optional[Memory]:
"""Return a memory by id, or None."""
@abc.abstractmethod
def delete(self, memory_id: str) -> bool:
"""Delete a memory by id. Return True if it existed."""
@abc.abstractmethod
def list_all(self) -> list[Memory]:
"""Return all stored memories."""
