diff --git a/next.config.ts b/next.config.ts
index 2104451..aee8047 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -1,5 +1,49 @@
 import type { NextConfig } from 'next';
 
+const isProd = process.env.NODE_ENV === 'production';
+
+/**
+ * Security headers applied to every response. Per audit-pass-#3 finding:
+ * the previous config emitted no CSP, X-Frame-Options, HSTS, or
+ * X-Content-Type-Options — the app was open to clickjacking + MIME
+ * sniffing.
+ *
+ * CSP notes:
+ *   - 'unsafe-inline' on style-src is required by Tailwind's runtime
+ *     style injection and Radix; revisit when Tailwind v4 ships a
+ *     nonce story.
+ *   - 'unsafe-eval' on script-src is dev-only — Next dev uses eval for
+ *     HMR. Production drops it.
+ *   - connect-src allows ws/wss for Socket.IO and https: for outgoing
+ *     fetches; tighten in prod via per-port branding URLs once we move
+ *     the s3 image references into a known allowlist.
+ *   - img-src https: is wide because port branding pulls from
+ *     s3.portnimara.com plus per-port image URLs configured at runtime.
+ */
+const csp = [
+  "default-src 'self'",
+  `script-src 'self' 'unsafe-inline'${isProd ? '' : " 'unsafe-eval'"}`,
+  "style-src 'self' 'unsafe-inline'",
+  "img-src 'self' data: blob: https:",
+  "font-src 'self' data:",
+  "connect-src 'self' ws: wss: https:",
+  "frame-ancestors 'none'",
+  "base-uri 'self'",
+  "form-action 'self'",
+  "object-src 'none'",
+].join('; ');
+
+const securityHeaders = [
+  { key: 'Content-Security-Policy', value: csp },
+  { key: 'X-Frame-Options', value: 'DENY' },
+  { key: 'X-Content-Type-Options', value: 'nosniff' },
+  { key: 'Referrer-Policy', value: 'strict-origin-when-cross-origin' },
+  { key: 'Permissions-Policy', value: 'camera=(self), microphone=(), geolocation=()' },
+  ...(isProd
+    ? [{ key: 'Strict-Transport-Security', value: 'max-age=31536000; includeSubDomains' }]
+    : []),
+];
+
 const nextConfig: NextConfig = {
   output: 'standalone',
   serverExternalPackages: [
@@ -24,6 +68,14 @@ const nextConfig: NextConfig = {
     // process.cwd() requires the file to be traced explicitly.
     '/api/v1/document-templates/**': ['./assets/eoi-template.pdf'],
   },
+  async headers() {
+    return [
+      {
+        source: '/:path*',
+        headers: securityHeaders,
+      },
+    ];
+  },
 };
 
 export default nextConfig;
diff --git a/src/lib/queue/scheduler.ts b/src/lib/queue/scheduler.ts
index 4445e43..ec45a33 100644
--- a/src/lib/queue/scheduler.ts
+++ b/src/lib/queue/scheduler.ts
@@ -59,6 +59,8 @@ export async function registerRecurringJobs(): Promise<void> {
     { queue: 'maintenance', name: 'ai-usage-retention', pattern: '0 5 * * *' },
     // Migration 0040 contract: error_events older than 90 days get pruned.
     { queue: 'maintenance', name: 'error-events-retention', pattern: '0 6 * * *' },
+    // Raw website inquiry payloads — 180-day retention.
+    { queue: 'maintenance', name: 'website-submissions-retention', pattern: '0 7 * * *' },
   ];
 
   for (const job of recurring) {
diff --git a/src/lib/queue/workers/maintenance.ts b/src/lib/queue/workers/maintenance.ts
index 6520149..f52d7bb 100644
--- a/src/lib/queue/workers/maintenance.ts
+++ b/src/lib/queue/workers/maintenance.ts
@@ -8,6 +8,7 @@ import { formSubmissions } from '@/lib/db/schema/documents';
 import { gdprExports } from '@/lib/db/schema/gdpr';
 import { aiUsageLedger } from '@/lib/db/schema/ai-usage';
 import { errorEvents } from '@/lib/db/schema/system';
+import { websiteSubmissions } from '@/lib/db/schema/website-submissions';
 import { logger } from '@/lib/logger';
 import { getStorageBackend } from '@/lib/storage';
 import { QUEUE_CONFIGS } from '@/lib/queue';
@@ -17,6 +18,10 @@ const AI_USAGE_RETENTION_DAYS = 90;
 /** error_events rows older than this are pruned. Migration 0040 declares
  *  this contract; the worker had no implementation until now. */
 const ERROR_EVENTS_RETENTION_DAYS = 90;
+/** Raw website inquiry payloads (website_submissions) — kept long enough
+ *  to investigate "why didn't this lead reach the CRM" inbound questions
+ *  but not indefinitely. 180d aligns with the typical sales cycle. */
+const WEBSITE_SUBMISSIONS_RETENTION_DAYS = 180;
 
 export const maintenanceWorker = new Worker(
   'maintenance',
@@ -133,6 +138,23 @@ export const maintenanceWorker = new Worker(
         );
         break;
       }
+      case 'website-submissions-retention': {
+        // Raw inquiry payloads from the marketing-site dual-write. Keep
+        // long enough to debug capture issues but not forever — these
+        // rows include reCAPTCHA + IP + UA metadata.
+        const cutoff = new Date(
+          Date.now() - WEBSITE_SUBMISSIONS_RETENTION_DAYS * 24 * 60 * 60 * 1000,
+        );
+        const result = await db
+          .delete(websiteSubmissions)
+          .where(lt(websiteSubmissions.receivedAt, cutoff))
+          .returning({ id: websiteSubmissions.id });
+        logger.info(
+          { deleted: result.length, retentionDays: WEBSITE_SUBMISSIONS_RETENTION_DAYS },
+          'Website submissions retention sweep complete',
+        );
+        break;
+      }
       default:
         logger.warn({ jobName: job.name }, 'Unknown maintenance job');
     }