Scarriffle 91ae434e7c Add per-setting cross-device sync flags to user settings ...

Introduce an account-wide sync-flag map that is the single server-side
authority for which settings each client sends/fetches, plus value columns
for two newly-syncable device-local prefs.

- models.UserSettings: sync_flags (JSON), cache_months, month_view_paged
- main._migrate(): idempotent ALTER TABLE for the three new columns
- settings_router: DEFAULT_SYNC map + _resolve_sync_flags(); GET returns
  fully-resolved sync_flags (+ cache_months, month_view_paged); PUT accepts
  and merges a partial sync_flags map and the two new value fields

Rollout defaults: settings that already lived on the server sync ON; the
four newly-syncable prefs (language, share icon, cache range, month paging)
sync OFF until the user opts in.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-14 20:44:44 +02:00

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