-- WhispAssist calendar-event attendees schema (Phase 6, T6.1/T6.2, FR-CAL-1).
-- Forward-only migration. Mirrors docs/03-data-model.md.
PRAGMA foreign_keys = ON;

-- Attendees per imported calendar event (populated at import time from the
-- source's own attendee list, e.g. a .pst appointment's ATTENDEE lines) —
-- distinct from meeting_participants, which links a *recording* to people
-- once a meeting is attached to an event (T6.3/T6.6).
CREATE TABLE calendar_event_participants (
    calendar_event_id TEXT NOT NULL REFERENCES calendar_events(id) ON DELETE CASCADE,
    participant_id     TEXT NOT NULL REFERENCES participants(id),
    role                TEXT,                       -- organizer|required|optional
    PRIMARY KEY (calendar_event_id, participant_id)
);

-- Dedup re-imports of the same PST (or the same event across multiple PSTs
-- from the same source kind) by the source's own stable UID.
CREATE UNIQUE INDEX idx_calendar_events_source_uid ON calendar_events(source, raw_uid)
    WHERE raw_uid IS NOT NULL;