diff --git a/.github/labels.yaml b/.github/labels.yaml
new file mode 100644
index 0000000..48060af
--- /dev/null
+++ b/.github/labels.yaml
@@ -0,0 +1,30 @@
+- name: "B-brawl-failed"
+  color: "B60205"
+- name: "B-brawl-merged"
+  color: "5319E7"
+- name: "B-brawl-merging"
+  color: "006B75"
+- name: "B-brawl-queued"
+  color: "C2E0C6"
+- name: "B-brawl-try"
+  color: "FBCA04"
+- name: "B-brawl-try-failed"
+  color: "B60205"
+- name: "bug"
+  color: "d73a4a"
+- name: "documentation"
+  color: "0075ca"
+- name: "duplicate"
+  color: "cfd3d7"
+- name: "enhancement"
+  color: "a2eeef"
+- name: "good first issue"
+  color: "7057ff"
+- name: "help wanted"
+  color: "008672"
+- name: "invalid"
+  color: "e4e669"
+- name: "question"
+  color: "d876e3"
+- name: "wontfix"
+  color: "ffffff"
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f19fce8..429b8fb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -113,7 +113,6 @@ jobs:
   test:
     name: Test
     runs-on: ubuntu-24.04
-    if: ${{ !cancelled() && github.event_name != 'pull_request' }}
     services:
       postgres:
         image: postgres
diff --git a/.github/workflows/sync-labels.yaml b/.github/workflows/sync-labels.yaml
new file mode 100644
index 0000000..8e39442
--- /dev/null
+++ b/.github/workflows/sync-labels.yaml
@@ -0,0 +1,32 @@
+name: Sync Labels
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    paths:
+      - ".github/labels.yaml"
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  synclabels:
+    name: Sync Labels
+    runs-on: ubuntu-24.04
+
+    permissions: write-all
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Sync labels
+        uses: crazy-max/ghaction-github-labeler@v5
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          dry-run: ${{ github.event_name == 'pull_request' }}
+          yaml-file: .github/labels.yaml
diff --git a/server/src/command/dry_run.rs b/server/src/command/dry_run.rs
index d97130c..703ba48 100644
--- a/server/src/command/dry_run.rs
+++ b/server/src/command/dry_run.rs
@@ -42,6 +42,20 @@ async fn handle_with_pr<R: GitHubRepoClient>(
         return Ok(());
     }
 
+    if pr.merged_at.is_some() {
+        context
+            .repo
+            .send_message(
+                pr.number,
+                &messages::error(
+                    "PR is already merged",
+                    "Currently running runs on a PR that has been merged is not supported",
+                ),
+            )
+            .await?;
+        return Ok(());
+    }
+
     if let Some(base_sha) = &mut command.base_sha {
         let Some(base_commit) = context.repo.get_commit(base_sha).await.context("get base commit")? else {
             context
@@ -897,4 +911,74 @@ mod tests {
 
         assert!(run.is_none());
     }
+
+    #[tokio::test]
+    async fn test_dry_run_pr_merged() {
+        let mut conn = crate::database::get_test_connection().await;
+
+        let (client, mut rx) = MockRepoClient::new(MockMergeWorkflow::default());
+
+        let pr = PullRequest {
+            number: 1,
+            merged_at: Some(Utc::now().into()),
+            ..Default::default()
+        };
+
+        let task = tokio::spawn(async move {
+            handle_with_pr(
+                &mut conn,
+                pr,
+                BrawlCommandContext {
+                    repo: &client,
+                    pr_number: 1,
+                    user: User {
+                        id: UserId(3),
+                        login: "test".to_string(),
+                    },
+                },
+                DryRunCommand {
+                    head_sha: None,
+                    base_sha: None,
+                },
+            )
+            .await
+            .unwrap();
+
+            (conn, client)
+        });
+
+        match rx.recv().await.unwrap() {
+            MockRepoAction::HasPermission { result, .. } => {
+                result.send(Ok(true)).unwrap();
+            }
+            _ => panic!("unexpected action"),
+        }
+
+        match rx.recv().await.unwrap() {
+            MockRepoAction::SendMessage {
+                issue_number,
+                message,
+                result,
+            } => {
+                assert_eq!(issue_number, 1);
+                insta::assert_snapshot!(message, @r"
+                🚨 PR is already merged
+                <details>
+                <summary>Error</summary>
+
+                Currently running runs on a PR that has been merged is not supported
+
+                </details>
+                ");
+                result.send(Ok(())).unwrap();
+            }
+            _ => panic!("unexpected action"),
+        }
+
+        let (mut conn, client) = task.await.unwrap();
+
+        let run = CiRun::active(client.id(), 1).get_result(&mut conn).await.optional().unwrap();
+
+        assert!(run.is_none());
+    }
 }