-- 0014_notifications.sql
--
-- Notification channels (operator-configured destinations: webhook,
-- ntfy, SMTP) and the dispatch log. Both are net-new — no rebuild
-- pattern needed.
--
-- config is an AEAD-encrypted JSON blob. Per-kind shape lives in
-- internal/notification/{webhook,ntfy,smtp}.go. The CHECK keeps wire
-- consistency — adding a new kind requires a follow-up migration
-- (forces the implementer to think about it).

CREATE TABLE notification_channels (
  id              TEXT PRIMARY KEY,
  kind            TEXT NOT NULL CHECK (kind IN ('webhook', 'ntfy', 'smtp')),
  name            TEXT NOT NULL,
  enabled         INTEGER NOT NULL DEFAULT 1 CHECK (enabled IN (0, 1)),
  config          BLOB NOT NULL,         -- AEAD-encrypted JSON; per-kind shape
  default_priority TEXT,                 -- ntfy only; null for webhook + smtp
  created_at      TEXT NOT NULL,
  updated_at      TEXT NOT NULL,
  last_fired_at   TEXT
);

CREATE INDEX notification_channels_enabled
  ON notification_channels(enabled) WHERE enabled = 1;

CREATE TABLE notification_log (
  id           TEXT PRIMARY KEY,
  channel_id   TEXT NOT NULL REFERENCES notification_channels(id) ON DELETE CASCADE,
  alert_id     TEXT REFERENCES alerts(id) ON DELETE SET NULL,
  event        TEXT NOT NULL,            -- alert.raised | alert.acknowledged | alert.resolved | alert.test
  ok           INTEGER NOT NULL CHECK (ok IN (0, 1)),
  status_code  INTEGER,
  latency_ms   INTEGER,
  error        TEXT,
  fired_at     TEXT NOT NULL
);

CREATE INDEX notification_log_channel
  ON notification_log(channel_id, fired_at DESC);
CREATE INDEX notification_log_alert
  ON notification_log(alert_id);