-- Migration 004 — Phase 7 notify and send (AGENTS.md §4 FR-9/FR-13/FR-14,
-- §11 Phase 7).
--
-- `notifications` becomes the delivery log: one row per brief per recipient per
-- channel. The brief text is the `summary` column (it was already there), and
-- the new columns record where the row belongs (scope), which channel and
-- Apprise tag were used, whether the delivery succeeded, and the redacted error
-- when it did not. A failed send is therefore visible and loud instead of being
-- lost (FR-12).
--
-- A draft (built but not sent) is a row with an empty `channel`, ok = 0 and
-- sent_at NULL, which is what the Phase 5 dashboard already showed.

ALTER TABLE notifications ADD COLUMN scope   TEXT    NOT NULL DEFAULT '';
ALTER TABLE notifications ADD COLUMN channel TEXT    NOT NULL DEFAULT '';
ALTER TABLE notifications ADD COLUMN tag     TEXT    NOT NULL DEFAULT '';
ALTER TABLE notifications ADD COLUMN ok      INTEGER NOT NULL DEFAULT 0;
ALTER TABLE notifications ADD COLUMN error   TEXT    NOT NULL DEFAULT '';

CREATE INDEX IF NOT EXISTS idx_notifications_scope ON notifications(scope, created_at);