Initial commit

apps/server/src/modules/notifications/retention.ts

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+import { and, eq, lt } from 'drizzle-orm'
+import { db } from '../../db/client.js'
+import { notifications, topics } from '../../db/schema.js'
+import { resolveRetentionDefaultDays } from '../admin/system-settings.js'
+
+const CLEANUP_INTERVAL_MS = 60 * 60 * 1000 // 1 hour
+
+// Per-topic retentionDays overrides the global default; 0 means "forever".
+// See docs/phase1/03-database-model.md, "Retention cleanup".
+export async function runRetentionCleanup(): Promise<number> {
+  const topicRows = await db.select().from(topics)
+  const retentionDefaultDays = await resolveRetentionDefaultDays()
+  let totalDeleted = 0
+
+  for (const topic of topicRows) {
+    const retentionDays = topic.retentionDays ?? retentionDefaultDays
+    if (retentionDays === 0) continue
+
+    const cutoff = new Date(Date.now() - retentionDays * 24 * 60 * 60 * 1000)
+    const deleted = await db
+      .delete(notifications)
+      .where(and(eq(notifications.topicId, topic.id), lt(notifications.createdAt, cutoff)))
+      .returning({ id: notifications.id })
+
+    totalDeleted += deleted.length
+  }
+
+  return totalDeleted
+}
+
+export function startRetentionCleanupJob(
+  onError: (err: unknown) => void = console.error,
+): NodeJS.Timeout {
+  const run = () => {
+    runRetentionCleanup().catch(onError)
+  }
+  run() // catch up on anything overdue from before this boot
+  const timer = setInterval(run, CLEANUP_INTERVAL_MS)
+  timer.unref() // never block process shutdown just to keep this alive
+  return timer
+}