diff --git a/backend/src/agent/podman.ts b/backend/src/agent/podman.ts
index 7bab328..b2def92 100644
--- a/backend/src/agent/podman.ts
+++ b/backend/src/agent/podman.ts
@@ -7,6 +7,7 @@ import {
   recordObservation,
   recordCollision,
   recordIntervention,
+  hasRecentInterventionForCollision,
   updateInterventionStatus,
 } from '../memory/store.js';
 import { getGitStates } from '../memory/db.js';
@@ -66,6 +67,7 @@ export class PodMan {
     const prior = await recallSimilar(collision); // Loop A: exact/vector recall raises confidence
     if (prior) collision.severity = 'critical';
     if (!shouldIntervene(collision, prior)) return; // Loop B: policy gate
+    if (await hasRecentInterventionForCollision(collision)) return;
 
     await recordCollision(collision);
     const action = preferredAction(collision, prior);
diff --git a/backend/src/memory/db.ts b/backend/src/memory/db.ts
index 5b64c73..2a83cd0 100644
--- a/backend/src/memory/db.ts
+++ b/backend/src/memory/db.ts
@@ -57,6 +57,8 @@ export interface GitState {
   gitUpdatedAt: Date | null;
 }
 
+const GIT_STATE_TTL_MS = Number(process.env.GIT_STATE_TTL_MS ?? '120000');
+
 /** Fetch latest git state per engineer for a pod from the engineer_states collection.
  *  Returns a map keyed by engineer name (matches --name arg used in podman-agent.mjs). */
 export async function getGitStates(podId: string): Promise<Map<string, GitState>> {
@@ -71,7 +73,17 @@ export async function getGitStates(podId: string): Promise<Map<string, GitState>
   }>('engineer_states');
   const docs = await col.find({ podId }).toArray();
   const map = new Map<string, GitState>();
+  const now = Date.now();
   for (const doc of docs) {
+    const updatedAt = doc.gitUpdatedAt ? new Date(doc.gitUpdatedAt) : null;
+    if (
+      updatedAt &&
+      !Number.isNaN(updatedAt.getTime()) &&
+      GIT_STATE_TTL_MS > 0 &&
+      now - updatedAt.getTime() > GIT_STATE_TTL_MS
+    ) {
+      continue;
+    }
     map.set(doc.name, {
       changedFiles: doc.changedFiles ?? [],
       branch: doc.branch ?? null,
diff --git a/backend/src/memory/policy.ts b/backend/src/memory/policy.ts
index a39046c..b8be7bf 100644
--- a/backend/src/memory/policy.ts
+++ b/backend/src/memory/policy.ts
@@ -16,7 +16,7 @@ export function shouldIntervene(collision: Collision, prior: RecalledCollision |
 
   const cooldown = cooldownMs();
   const last = lastNudgeByPod.get(collision.podId) ?? 0;
-  if (cooldown > 0 && Date.now() - last < cooldown && collision.severity !== 'critical') {
+  if (cooldown > 0 && Date.now() - last < cooldown) {
     return false;
   }
 
diff --git a/backend/src/memory/store.ts b/backend/src/memory/store.ts
index a314a17..8125385 100644
--- a/backend/src/memory/store.ts
+++ b/backend/src/memory/store.ts
@@ -8,6 +8,15 @@ import type {
 import { collections } from './db.js';
 import { enrichCollisionMemory } from './vectors.js';
 
+function comparableFile(raw?: string): string {
+  return (raw ?? '')
+    .trim()
+    .replace(/^(\?\?|[MADRCU!]{1,2})\s+/, '')
+    .split(/[\\/]/)
+    .pop()
+    ?.toLowerCase() ?? '';
+}
+
 /**
  * Continual-learning memory: persist observations, collisions, interventions,
  * and outcomes to MongoDB so later sessions get sharper. MongoDB is mandatory —
@@ -41,6 +50,31 @@ export async function recordIntervention(intervention: Intervention): Promise<vo
   );
 }
 
+export async function hasRecentInterventionForCollision(
+  collision: Collision,
+  windowMs = Number(process.env.NUDGE_COOLDOWN_MS ?? '180000'),
+): Promise<boolean> {
+  if (windowMs <= 0) return false;
+  const c = await collections();
+  const since = new Date(Date.now() - windowMs).toISOString();
+  const recent = await c.collisions
+    .find({ podId: collision.podId, detectedAt: { $gte: since } })
+    .sort({ detectedAt: -1 })
+    .limit(100)
+    .toArray();
+
+  const targetFile = comparableFile(collision.file);
+  for (const match of recent) {
+    if (match.id === collision.id || comparableFile(match.file) !== targetFile) continue;
+    const existing = await c.interventions.findOne({
+      collisionId: match.id,
+      createdAt: { $gte: since },
+    });
+    if (existing) return true;
+  }
+  return false;
+}
+
 export async function updateInterventionStatus(
   interventionId: string,
   status: InterventionStatus,
diff --git a/backend/src/server.ts b/backend/src/server.ts
index 6448eb4..2fac766 100644
--- a/backend/src/server.ts
+++ b/backend/src/server.ts
@@ -6,7 +6,13 @@ import { WebSocketServer } from 'ws';
 import { AccessToken, RoomAgentDispatch, RoomConfiguration } from 'livekit-server-sdk';
 import { env } from './env.js';
 import { createSyncPr } from './github/client.js';
-import { recordCollision, recordIntervention, recordOutcome, memoryStats } from './memory/store.js';
+import {
+  recordCollision,
+  recordIntervention,
+  recordOutcome,
+  hasRecentInterventionForCollision,
+  memoryStats,
+} from './memory/store.js';
 import { closeMemory, initMemory } from './memory/db.js';
 import {
   listPods,
@@ -231,6 +237,9 @@ app.post('/api/pods/:id/hermes/notify', async (req, res) => {
       : undefined;
 
   try {
+    if (body.force !== true && (await hasRecentInterventionForCollision(collision))) {
+      return res.status(202).json({ ok: true, collision, intervention, livekit: 'suppressed' });
+    }
     await recordCollision(collision);
     await recordIntervention(intervention);
     if (body.dryRun === true) {
diff --git a/frontend/src/components/PodView.tsx b/frontend/src/components/PodView.tsx
index 73c5efe..ff63fb3 100644
--- a/frontend/src/components/PodView.tsx
+++ b/frontend/src/components/PodView.tsx
@@ -544,8 +544,8 @@ export function PodView({
                   </CardHeader>
                   <CardContent>
                     <LiveWaveform
-                      processing={!!room}
-                      active={beat.on}
+                      processing={!!room || beat.on}
+                      active={false}
                       height={32}
                       barWidth={2}
                       barGap={3}