"""Runtime-bound API storage selection; borrowed stores are never adapter-owned."""
from pathlib import Path


def selected_session_db(adapter, home):
    from gateway.session_authorities import authority_for_home
    # Only a home this runtime reserved has a store here; a multiplex route alone is not proof.
    authority = authority_for_home(adapter.gateway_runner, home)
    if authority is None:
        return None
    with adapter._session_db_cache_lock:
        if adapter._session_db_cache_closed:
            return None
    return authority.db