feat(api): add SSE subscriber isolation, token pruning and E2E rate-limit guard

- event-bus: wrap each subscriber.fn call in try/catch so one throwing subscriber cannot kill delivery to all others
- event-bus: log Redis parse errors instead of swallowing them silently; add .catch() on Redis publish promise for async fallback to local delivery
- pruning.ts: new runPruning() deletes expired invite tokens, expired password-reset tokens, and read notifications older than 90 days
- settings.runPruning: expose pruning as adminProcedure mutation
- trpc.ts: E2E_TEST_MODE rate-limit bypass is now a no-op in production (NODE_ENV=production); logs a startup warning if misconfigured

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/api/src/lib/pruning.ts

@@ -0,0 +1,36 @@
+import type { PrismaClient } from "@capakraken/db";
+
+const NOTIFICATION_RETENTION_DAYS = 90;
+
+/**
+ * Deletes expired invite tokens, expired password-reset tokens, and read
+ * notifications older than NOTIFICATION_RETENTION_DAYS.
+ *
+ * Designed to be called from an admin procedure or a scheduled job.
+ * Returns counts of deleted rows for observability.
+ */
+export async function runPruning(db: PrismaClient): Promise<{
+  inviteTokensDeleted: number;
+  passwordResetTokensDeleted: number;
+  notificationsDeleted: number;
+}> {
+  const now = new Date();
+  const notificationCutoff = new Date(now.getTime() - NOTIFICATION_RETENTION_DAYS * 24 * 60 * 60 * 1000);
+
+  const [inviteResult, resetResult, notificationResult] = await Promise.all([
+    db.inviteToken.deleteMany({ where: { expiresAt: { lt: now } } }),
+    db.passwordResetToken.deleteMany({ where: { expiresAt: { lt: now } } }),
+    db.notification.deleteMany({
+      where: {
+        readAt: { not: null },
+        createdAt: { lt: notificationCutoff },
+      },
+    }),
+  ]);
+
+  return {
+    inviteTokensDeleted: inviteResult.count,
+    passwordResetTokensDeleted: resetResult.count,
+    notificationsDeleted: notificationResult.count,
+  };
+}

packages/api/src/router/settings.ts

@@ -1,4 +1,5 @@
 import { adminProcedure, createTRPCRouter } from "../trpc.js";
+import { runPruning } from "../lib/pruning.js";
 import {
   clearStoredRuntimeSecrets,
   getAiConfiguredStatus,
@@ -26,4 +27,6 @@ export const settingsRouter = createTRPCRouter({
   testGeminiConnection: adminProcedure.mutation(({ ctx }) => testSettingsGeminiConnection(ctx)),
 
   getAiConfigured: adminProcedure.query(({ ctx }) => getAiConfiguredStatus(ctx)),
+
+  runPruning: adminProcedure.mutation(({ ctx }) => runPruning(ctx.db)),
 });

packages/api/src/sse/event-bus.ts

@@ -90,7 +90,11 @@ function matchesSubscription(event: SseEvent, subscription: Subscription): boole
 function deliverEvent(event: SseEvent): void {
   for (const subscription of subscribers) {
     if (matchesSubscription(event, subscription)) {
-      subscription.fn(event);
+      try {
+        subscription.fn(event);
+      } catch (err) {
+        logger.warn({ err, eventType: event.type }, "SSE subscriber threw during event delivery");
+      }
     }
   }
 }
@@ -216,8 +220,8 @@ function setupSubscriber(): void {
           timestamp: parsed.timestamp,
           audience: canonicalizeSseAudiences(parsed.audience),
         });
-      } catch {
-        // ignore parse errors
+      } catch (err) {
+        logger.warn({ err, message }, "Failed to parse SSE Redis message");
       }
     });
   } catch (e) {
@@ -257,7 +261,10 @@ class EventBus {
           timestamp: normalizedEvent.timestamp,
           audience: normalizedEvent.audience,
         }),
-      );
+      ).catch((e: unknown) => {
+        logger.warn({ err: e, redisUrl: REDIS_URL, channel: CHANNEL }, "Redis publish promise rejected, falling back to local-only SSE delivery");
+        publishLocal(normalizedEvent);
+      });
     } catch (e) {
       logger.warn({ err: e, redisUrl: REDIS_URL, channel: CHANNEL }, "Redis publish failed, falling back to local-only SSE delivery");
       // Deliver locally when Redis is unavailable

packages/api/src/trpc.ts

@@ -89,7 +89,12 @@ export const publicProcedure = t.procedure;
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 const withLogging = t.middleware(loggingMiddleware as any);
-const isE2eTestMode = process.env["E2E_TEST_MODE"] === "true";
+const isE2eTestMode =
+  process.env["E2E_TEST_MODE"] === "true" && process.env["NODE_ENV"] !== "production";
+if (process.env["E2E_TEST_MODE"] === "true" && process.env["NODE_ENV"] === "production") {
+  // eslint-disable-next-line no-console
+  console.warn("[SECURITY] E2E_TEST_MODE is set in production — rate limiting is NOT bypassed.");
+}
 
 /**
  * Protected procedure — requires authenticated session AND a valid DB user record.