fix various issues

apps/shared/db.ts

@@ -35,14 +35,12 @@ export async function migrate(sql: any) {
       cert_alert_days  INTEGER NOT NULL DEFAULT 0,
       max_redirects    INTEGER NOT NULL DEFAULT 1,
       tags             TEXT[] NOT NULL DEFAULT '{}',
-      channel_ids      UUID[] NOT NULL DEFAULT '{}',
       created_at       TIMESTAMPTZ DEFAULT now(),
       updated_at       TIMESTAMPTZ DEFAULT now()
     )
   `;
   await sql`CREATE INDEX IF NOT EXISTS idx_monitors_account ON monitors(account_id)`;
   await sql`CREATE INDEX IF NOT EXISTS idx_monitors_tags ON monitors USING GIN(tags)`;
-  await sql`CREATE INDEX IF NOT EXISTS idx_monitors_channel_ids ON monitors USING GIN(channel_ids)`;
 
   // ── pings ─────────────────────────────────────────────────────────────
   await sql`
@@ -114,10 +112,34 @@ export async function migrate(sql: any) {
       kind        TEXT NOT NULL,
       config      JSONB NOT NULL,
       enabled     BOOLEAN NOT NULL DEFAULT true,
+      monitor_ids TEXT[] NOT NULL DEFAULT '{}',
       created_at  TIMESTAMPTZ DEFAULT now()
     )
   `;
   await sql`CREATE INDEX IF NOT EXISTS idx_notification_channels_account ON notification_channels(account_id)`;
+  await sql`ALTER TABLE notification_channels ADD COLUMN IF NOT EXISTS monitor_ids TEXT[] NOT NULL DEFAULT '{}'`;
+  await sql`CREATE INDEX IF NOT EXISTS idx_notification_channels_monitor_ids ON notification_channels USING GIN(monitor_ids)`;
+
+  // ── one-time flip: monitors.channel_ids → notification_channels.monitor_ids ──
+  const [chanCol] = await sql`
+    SELECT 1 FROM information_schema.columns
+    WHERE table_name = 'monitors' AND column_name = 'channel_ids'
+  `;
+  if (chanCol) {
+    await sql`
+      UPDATE notification_channels c SET monitor_ids = sub.mids
+      FROM (
+        SELECT m.channel_id::uuid AS cid, array_agg(m.id) AS mids
+        FROM (
+          SELECT id, UNNEST(channel_ids) AS channel_id FROM monitors
+        ) m
+        GROUP BY m.channel_id
+      ) sub
+      WHERE c.id = sub.cid
+    `;
+    await sql`ALTER TABLE monitors DROP COLUMN IF EXISTS channel_ids`;
+    await sql`DROP INDEX IF EXISTS idx_monitors_channel_ids`;
+  }
 
   // ── status_pages ──────────────────────────────────────────────────────
   await sql`