New columns, all ADD COLUMN with inert defaults -- no existing frame's
behavior changes until mode is explicitly switched to "calendar":
- users.calendar_ics_url: one personal iCal/CalDAV subscription per
user, same shape as the existing per-user immich_url/immich_api_key.
- user_frames.calendar_included: explicit per-(user,frame) opt-in,
default off. Being linked to a frame does not by itself contribute
your calendar to it -- each person's calendar is their own data to
share, not something a frame's controller decides on their behalf.
- frames.calendar_view/calendar_photo_inlay/calendar_browse_offset:
per-frame display settings and NEXT/BACK navigation state.
- frames.calendar_checked_at/calendar_cached_events/calendar_fetch_summary:
the throttled merge-fetch cache, same shape as the existing
firmware_update_checked_at/firmware_gitea_latest_version pattern.
tfaour
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