The special-dates mirror needs a durable, user-invisible per-event key so a
re-sync diffs instead of duplicating. Rather than Events.SYNC_DATA1 (which the
provider drops on a LOCAL calendar unless written via a sync-adapter URI), the
key is a deterministic UID_2445 (contact-<type>:<lookupKey>@calendula), written
and read through the normal event URIs the app already uses.
- createManagedCalendar: a normal local calendar plus a CAL_SYNC2 marker, so the
mirror can re-adopt its calendars after a prefs wipe (findManagedCalendars).
- queryManagedEvents: reads back _ID/UID_2445/TITLE/DTSTART/RRULE (DELETED=0) as
the existing side of the diff.
- insertManagedEvent: writes the deterministic UID and seeds reminder rows once.
- updateManagedFields: a bare, targeted column update — never reconciles
reminders/attendees, so user-owned event data survives every sync.
Reuses toWriteTimes/toRfc2445Duration (all-day UTC-midnight DTSTART + P1D
DURATION for the FREQ=YEARLY row) and the existing deleteEvent for removals.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jean-Luc Makiola
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