diff --git a/demo/Blackholio/.github/workflows/repo-migration-notice.yml b/demo/Blackholio/.github/workflows/repo-migration-notice.yml
new file mode 100644
index 00000000000..e3cc94fa4b5
--- /dev/null
+++ b/demo/Blackholio/.github/workflows/repo-migration-notice.yml
@@ -0,0 +1,60 @@
+name: Repo migration notice
+
+on:
+  issues:
+    types: [opened]
+  pull_request:
+    types: [opened]
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Add comment
+        uses: actions/github-script@v7
+        env:
+          migrated_repo: https://github.com/ClockworkLabs/SpacetimeDB
+          migrated_path: demo/Blackholio
+          default_branch: master
+        with:
+          script: |
+            const isPR = context.eventName === 'pull_request';
+            const number = isPR ? context.payload.pull_request.number : context.payload.issue.number;
+
+            let message;
+            if (isPR) {
+              message = `
+              Thank you for submitting this!
+
+              We are in the process of migrating this repository (see [DEVELOP.md](../blob/${process.env.default_branch}/DEVELOP.md)).
+
+              To make sure we see your PR, please open it in the [SpacetimeDB](${process.env.migrated_repo}) repo, under [${process.env.migrated_path}](${process.env.migrated_repo}/tree/master/${process.env.migrated_path}).
+
+              Apologies for the inconvenience, and thank you again!
+              `;
+            } else {
+              message = `
+              Thank you for submitting this!
+
+              We are in the process of migrating this repository (see [DEVELOP.md](../blob/${process.env.default_branch}/DEVELOP.md)).
+
+              To make sure we actually see your issue, please open it here: [SpacetimeDB/issues/new](${process.env.migrated_repo}/issues/new).
+
+              Apologies for the inconvenience, and thank you again!
+              `;
+            }
+
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: number,
+              body: message
+            });
+
+            await github.rest.issues.update({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: number,
+              state: 'closed'
+            });
diff --git a/docs/.github/workflows/repo-migration-notice.yml b/docs/.github/workflows/repo-migration-notice.yml
new file mode 100644
index 00000000000..9794bb04766
--- /dev/null
+++ b/docs/.github/workflows/repo-migration-notice.yml
@@ -0,0 +1,60 @@
+name: Repo migration notice
+
+on:
+  issues:
+    types: [opened]
+  pull_request:
+    types: [opened]
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Add comment
+        uses: actions/github-script@v7
+        env:
+          migrated_repo: https://github.com/ClockworkLabs/SpacetimeDB
+          migrated_path: docs
+          default_branch: master
+        with:
+          script: |
+            const isPR = context.eventName === 'pull_request';
+            const number = isPR ? context.payload.pull_request.number : context.payload.issue.number;
+
+            let message;
+            if (isPR) {
+              message = `
+              Thank you for submitting this!
+
+              We are in the process of migrating this repository (see [DEVELOP.md](../blob/${process.env.default_branch}/DEVELOP.md)).
+
+              To make sure we see your PR, please open it in the [SpacetimeDB](${process.env.migrated_repo}) repo, under [${process.env.migrated_path}](${process.env.migrated_repo}/tree/master/${process.env.migrated_path}).
+
+              Apologies for the inconvenience, and thank you again!
+              `;
+            } else {
+              message = `
+              Thank you for submitting this!
+
+              We are in the process of migrating this repository (see [DEVELOP.md](../blob/${process.env.default_branch}/DEVELOP.md)).
+
+              To make sure we actually see your issue, please open it here: [SpacetimeDB/issues/new](${process.env.migrated_repo}/issues/new).
+
+              Apologies for the inconvenience, and thank you again!
+              `;
+            }
+
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: number,
+              body: message
+            });
+
+            await github.rest.issues.update({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: number,
+              state: 'closed'
+            });
diff --git a/sdks/csharp/.github/workflows/repo-migration-notice.yml b/sdks/csharp/.github/workflows/repo-migration-notice.yml
new file mode 100644
index 00000000000..0a21a173e44
--- /dev/null
+++ b/sdks/csharp/.github/workflows/repo-migration-notice.yml
@@ -0,0 +1,60 @@
+name: Repo migration notice
+
+on:
+  issues:
+    types: [opened]
+  pull_request:
+    types: [opened]
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Add comment
+        uses: actions/github-script@v7
+        env:
+          migrated_repo: https://github.com/ClockworkLabs/SpacetimeDB
+          migrated_path: sdks/csharp
+          default_branch: release/latest
+        with:
+          script: |
+            const isPR = context.eventName === 'pull_request';
+            const number = isPR ? context.payload.pull_request.number : context.payload.issue.number;
+
+            let message;
+            if (isPR) {
+              message = `
+              Thank you for submitting this!
+
+              We are in the process of migrating this repository (see [DEVELOP.md](../blob/${process.env.default_branch}/DEVELOP.md)).
+
+              To make sure we see your PR, please open it in the [SpacetimeDB](${process.env.migrated_repo}) repo, under [${process.env.migrated_path}](${process.env.migrated_repo}/tree/master/${process.env.migrated_path}).
+
+              Apologies for the inconvenience, and thank you again!
+              `;
+            } else {
+              message = `
+              Thank you for submitting this!
+
+              We are in the process of migrating this repository (see [DEVELOP.md](../blob/${process.env.default_branch}/DEVELOP.md)).
+
+              To make sure we actually see your issue, please open it here: [SpacetimeDB/issues/new](${process.env.migrated_repo}/issues/new).
+
+              Apologies for the inconvenience, and thank you again!
+              `;
+            }
+
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: number,
+              body: message
+            });
+
+            await github.rest.issues.update({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: number,
+              state: 'closed'
+            });
diff --git a/sdks/typescript/.github/workflows/repo-migration-notice.yml b/sdks/typescript/.github/workflows/repo-migration-notice.yml
new file mode 100644
index 00000000000..e15168008a8
--- /dev/null
+++ b/sdks/typescript/.github/workflows/repo-migration-notice.yml
@@ -0,0 +1,60 @@
+name: Repo migration notice
+
+on:
+  issues:
+    types: [opened]
+  pull_request:
+    types: [opened]
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Add comment
+        uses: actions/github-script@v7
+        env:
+          migrated_repo: https://github.com/ClockworkLabs/SpacetimeDB
+          migrated_path: sdks/typescript
+          default_branch: main
+        with:
+          script: |
+            const isPR = context.eventName === 'pull_request';
+            const number = isPR ? context.payload.pull_request.number : context.payload.issue.number;
+
+            let message;
+            if (isPR) {
+              message = `
+              Thank you for submitting this!
+
+              We are in the process of migrating this repository (see [DEVELOP.md](../blob/${process.env.default_branch}/DEVELOP.md)).
+
+              To make sure we see your PR, please open it in the [SpacetimeDB](${process.env.migrated_repo}) repo, under [${process.env.migrated_path}](${process.env.migrated_repo}/tree/master/${process.env.migrated_path}).
+
+              Apologies for the inconvenience, and thank you again!
+              `;
+            } else {
+              message = `
+              Thank you for submitting this!
+
+              We are in the process of migrating this repository (see [DEVELOP.md](../blob/${process.env.default_branch}/DEVELOP.md)).
+
+              To make sure we actually see your issue, please open it here: [SpacetimeDB/issues/new](${process.env.migrated_repo}/issues/new).
+
+              Apologies for the inconvenience, and thank you again!
+              `;
+            }
+
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: number,
+              body: message
+            });
+
+            await github.rest.issues.update({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: number,
+              state: 'closed'
+            });