diff --git a/src/app/api/pr-followup/sync/route.ts b/src/app/api/pr-followup/sync/route.ts
index 8e58af1..fd8aa46 100644
--- a/src/app/api/pr-followup/sync/route.ts
+++ b/src/app/api/pr-followup/sync/route.ts
@@ -175,6 +175,8 @@ export async function POST(request: NextRequest) {
                 id: String(review.id),
                 state: review.state,
                 linkedIssue,
+                prState: pr.state,
+                prMergedAt: pr.merged_at,
               });
             } else {
               totalSkipped++; // APPROVED/COMMENTED don't trigger PR-fix work
@@ -226,6 +228,8 @@ export async function POST(request: NextRequest) {
             mergeStateStatus: pr.mergeable_state,
             id: String(pr.id ?? Date.now()),
             linkedIssue,
+            prState: pr.state,
+            prMergedAt: pr.merged_at,
           });
         }
 
diff --git a/src/app/api/pr-followup/webhook/route.ts b/src/app/api/pr-followup/webhook/route.ts
index f588f35..37bba83 100644
--- a/src/app/api/pr-followup/webhook/route.ts
+++ b/src/app/api/pr-followup/webhook/route.ts
@@ -72,6 +72,8 @@ function parseWebhookEvent(githubEvent: string, body: Record<string, unknown>):
         id: String(prReview.review?.id),
         state: prReview.review?.state,
         linkedIssue: extractLinkedIssueFromPr(pr),
+        prState: pr.state,
+        prMergedAt: pr.merged_at,
       });
       break;
     }
@@ -173,6 +175,8 @@ function parseWebhookEvent(githubEvent: string, body: Record<string, unknown>):
         mergeStateStatus: pr.mergeable_state,
         id: String(pr.id ?? Date.now()),
         linkedIssue: extractLinkedIssueFromPr(pr),
+        prState: pr.state,
+        prMergedAt: pr.merged_at,
       });
       break;
     }
diff --git a/src/lib/pr-followup-ingestion.test.ts b/src/lib/pr-followup-ingestion.test.ts
index 84abe3d..7bb5974 100644
--- a/src/lib/pr-followup-ingestion.test.ts
+++ b/src/lib/pr-followup-ingestion.test.ts
@@ -275,6 +275,48 @@ describe("ingestReviewEvent", () => {
     expect(client.items).toHaveLength(0);
   });
 
+  it("skips reviews for merged PRs (prMergedAt set)", async () => {
+    process.env.PR_FOLLOWUP_BOT_IDENTITIES = "itsmiso-ai";
+    const client = makeClient();
+
+    const result = await ingestReviewEvent(client, {
+      repoFullName: "misospace/dispatch",
+      prNumber: 42,
+      branch: "fix/test",
+      url: "https://github.com/misospace/dispatch/pull/42",
+      title: "Fix test issue",
+      author: "itsmiso-ai",
+      reviewBody: "Change X to Y",
+      reviewId: "r4",
+      reviewState: "CHANGES_REQUESTED",
+      prMergedAt: "2026-06-01T00:00:00Z",
+    });
+
+    expect(result).toBeNull();
+    expect(client.items).toHaveLength(0);
+  });
+
+  it("skips reviews for closed PRs (prState=closed)", async () => {
+    process.env.PR_FOLLOWUP_BOT_IDENTITIES = "itsmiso-ai";
+    const client = makeClient();
+
+    const result = await ingestReviewEvent(client, {
+      repoFullName: "misospace/dispatch",
+      prNumber: 42,
+      branch: "fix/test",
+      url: "https://github.com/misospace/dispatch/pull/42",
+      title: "Fix test issue",
+      author: "itsmiso-ai",
+      reviewBody: "Change X to Y",
+      reviewId: "r5",
+      reviewState: "CHANGES_REQUESTED",
+      prState: "closed",
+    });
+
+    expect(result).toBeNull();
+    expect(client.items).toHaveLength(0);
+  });
+
   afterEach(() => {
     delete process.env.PR_FOLLOWUP_BOT_IDENTITIES;
   });
@@ -383,6 +425,44 @@ describe("ingestMergeStateEvent", () => {
     expect(client.items).toHaveLength(0);
   });
 
+  it("skips merge state events for merged PRs (prMergedAt set)", async () => {
+    process.env.PR_FOLLOWUP_BOT_IDENTITIES = "itsmiso-ai";
+    const client = makeClient();
+
+    const result = await ingestMergeStateEvent(client, {
+      repoFullName: "misospace/dispatch",
+      prNumber: 42,
+      branch: "fix/test",
+      url: "https://github.com/misospace/dispatch/pull/42",
+      title: "Fix test issue",
+      author: "itsmiso-ai",
+      mergeStateStatus: "behind",
+      prMergedAt: "2026-06-01T00:00:00Z",
+    });
+
+    expect(result).toBeNull();
+    expect(client.items).toHaveLength(0);
+  });
+
+  it("skips merge state events for closed PRs (prState=closed)", async () => {
+    process.env.PR_FOLLOWUP_BOT_IDENTITIES = "itsmiso-ai";
+    const client = makeClient();
+
+    const result = await ingestMergeStateEvent(client, {
+      repoFullName: "misospace/dispatch",
+      prNumber: 42,
+      branch: "fix/test",
+      url: "https://github.com/misospace/dispatch/pull/42",
+      title: "Fix test issue",
+      author: "itsmiso-ai",
+      mergeStateStatus: "behind",
+      prState: "closed",
+    });
+
+    expect(result).toBeNull();
+    expect(client.items).toHaveLength(0);
+  });
+
   afterEach(() => {
     delete process.env.PR_FOLLOWUP_BOT_IDENTITIES;
   });
diff --git a/src/lib/pr-followup-ingestion.ts b/src/lib/pr-followup-ingestion.ts
index dd3d323..ad62657 100644
--- a/src/lib/pr-followup-ingestion.ts
+++ b/src/lib/pr-followup-ingestion.ts
@@ -231,12 +231,19 @@ export async function ingestReviewEvent(
     reviewBody: string;
     reviewId: string;
     reviewState: string; // "APPROVED", "CHANGES_REQUESTED", "COMMENTED"
+    prState?: string | null;
+    prMergedAt?: string | null;
     linkedIssue?: number | null;
   },
 ): Promise<string | null> {
   // Only CHANGES_REQUESTED triggers PR-fix work (not APPROVED or COMMENTED)
   if (opts.reviewState !== "CHANGES_REQUESTED") return null;
 
+
+  // Filter merged/closed PRs — do not enqueue work for terminal PRs
+  if (opts.prMergedAt || opts.prState === "closed") {
+    return null;
+  }
   // Check author eligibility
   if (!isAllowedBotAuthor(opts.author)) return null;
 
@@ -331,6 +338,8 @@ export async function ingestMergeStateEvent(
     title: string;
     author: string | null;
     mergeStateStatus: string; // "BEHIND", "DIRTY", "UNSTABLE", "HAS_HOOKS", etc.
+    prState?: string | null;
+    prMergedAt?: string | null;
     linkedIssue?: number | null;
   },
 ): Promise<string | null> {
@@ -338,6 +347,11 @@ export async function ingestMergeStateEvent(
   const problematicStates = ["behind", "dirty", "unstable", "has_hooks"];
   if (!problematicStates.includes(opts.mergeStateStatus.toLowerCase())) return null;
 
+
+  // Filter merged/closed PRs — do not enqueue work for terminal PRs
+  if (opts.prMergedAt || opts.prState === "closed") {
+    return null;
+  }
   // Check author eligibility
   if (!isAllowedBotAuthor(opts.author)) return null;
 
@@ -483,6 +497,8 @@ export interface PrFollowupEvent {
   conclusion?: string;
   checkName?: string;
   mergeStateStatus?: string;
+  prState?: string | null;
+  prMergedAt?: string | null;
   linkedIssue?: number | null;
 }
 
@@ -537,6 +553,8 @@ export async function processPrFollowupEvents(
               reviewId: event.id,
               reviewState: event.state,
               linkedIssue: event.linkedIssue,
+              prState: event.prState,
+              prMergedAt: event.prMergedAt,
             });
             if (key) enqueued++; else skipped++;
           } else {
@@ -576,6 +594,8 @@ export async function processPrFollowupEvents(
               author: event.author,
               mergeStateStatus: event.mergeStateStatus,
               linkedIssue: event.linkedIssue,
+              prState: event.prState,
+              prMergedAt: event.prMergedAt,
             });
             if (key) enqueued++; else skipped++;
           } else {