// Remembers, per study, the server copy's lastEdited that this device last saw — the "base" a save is
// checked against so another device's newer copy is never overwritten silently. Kept in memory: it is
// rebuilt from the server's list each time you sign in.
const base = new Map();

export const getSyncBase = (id) => base.get(id);
export const setSyncBase = (id, lastEdited) => { if (Number.isFinite(lastEdited)) base.set(id, lastEdited); };
export const clearSyncBase = (id) => base.delete(id);
export const resetSyncBases = () => base.clear();