Function mergeFromRealtimePayload

src/lib/sync.ts:94–136

(data: Record<string, unknown>)

// Merge from a realtime payload (no API call needed).
// Returns true if any data actually changed locally.
export function mergeFromRealtimePayload(data: Record<string, unknown>): boolean {
  // Skip if this update was triggered by our own upload (within 5s window)
  if (Date.now() - lastUploadAt < 5000) return false;

  let changed = false;

  const remoteCompleted = new Set<number>((data.completed as number[]) ?? []);
  const localCompleted = loadCompleted();
  if (!setsEqual(localCompleted, remoteCompleted)) {
    saveCompleted(remoteCompleted);
    changed = true;
  }

  const remoteStarred = new Set<number>((data.starred as number[]) ?? []);
  const localStarred = loadStarred();
  if (!setsEqual(localStarred, remoteStarred)) {
    saveStarred(remoteStarred);
    changed = true;
  }

  const remoteNotes = (data.notes as Record<number, string>) ?? {};
  const localNotes = loadNotes();
  if (!recordsEqual(localNotes, remoteNotes)) {
    saveNotes(remoteNotes);
    changed = true;
  }

  const remoteDates = (data.solved_dates as Record<number, string>) ?? {};
  const localDates = loadSolvedDates();
  if (!recordsEqual(localDates, remoteDates)) {
    saveSolvedDates(remoteDates);
    changed = true;
  }

  const remoteReminders = (data.reminders as Record<number, Reminder>) ?? {};
  const localReminders = loadReminders();
  if (JSON.stringify(localReminders) !== JSON.stringify(remoteReminders)) {
    saveReminders(remoteReminders);
    changed = true;
  }

  return changed;
}

function setsEqual(a: Set<number>, b: Set<number>): boolean {
  if (a.size !== b.size) return false;