feat(admin): add alert aggregator with dismissal filtering

server/utils/adminAlerts.js

@@ -257,4 +257,49 @@ export async function detectPendingTagSuggestions() {
   }
 }
 
-// Aggregator lands in task 8.
+const DETECTORS = [
+  detectSlackInviteFailed,
+  detectNoSlackHandleAfterWeek,
+  detectStuckPendingPayment,
+  detectSuspendedMembers,
+  detectPreRegistrantSelectedNotInvited,
+  detectPreRegistrantExpired,
+  detectDraftEventsImminent,
+  detectEventsNearCapacity,
+  detectPendingTagSuggestions
+]
+
+function signatureForAlert(alert) {
+  if (Array.isArray(alert.signatureIds)) {
+    return computeSignature(alert.signatureIds)
+  }
+  return computeSignature(alert.items.map((item) => item.id))
+}
+
+export async function computeAllAlerts(adminId) {
+  await connectDB()
+
+  const [rawAlerts, dismissals] = await Promise.all([
+    Promise.all(DETECTORS.map((fn) => fn())),
+    AdminAlertDismissal.find({ adminId }).lean()
+  ])
+
+  const dismissedByType = new Map()
+  for (const d of dismissals) {
+    dismissedByType.set(d.alertType, d.signature)
+  }
+
+  const result = []
+  for (const alert of rawAlerts) {
+    if (!alert.items || alert.items.length === 0) continue
+    const signature = signatureForAlert(alert)
+    if (dismissedByType.get(alert.type) === signature) continue
+    const { signatureIds, ...publicFields } = alert
+    result.push({
+      ...publicFields,
+      count: alert.items.length,
+      signature
+    })
+  }
+  return result
+}