diff --git a/ts/sql/migrations/1561-cleanup-polls.std.ts b/ts/sql/migrations/1561-cleanup-polls.std.ts
new file mode 100644
index 0000000000..fe8aa5f625
--- /dev/null
+++ b/ts/sql/migrations/1561-cleanup-polls.std.ts
@@ -0,0 +1,25 @@
+// Copyright 2025 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { LoggerType } from '../../types/Logging.std.js';
+import type { WritableDB } from '../Interface.std.js';
+import { sql } from '../util.std.js';
+
+// This migration was backported to earlier branches as 1541 and 1551
+export default function updateToSchemaVersion1561(
+  db: WritableDB,
+  logger: LoggerType
+): void {
+  const [query, params] = sql`
+    UPDATE messages 
+      SET 
+        json = json_remove(json, '$.poll'),
+        hasUnreadPollVotes = 0
+      WHERE isErased = 1 AND (
+        json->'poll' IS NOT NULL OR
+        hasUnreadPollVotes IS NOT 0
+      )
+  `;
+  const result = db.prepare(query).run(params);
+  logger.info(`Updated ${result.changes} poll messages`);
+}
diff --git a/ts/sql/migrations/index.node.ts b/ts/sql/migrations/index.node.ts
index 8d229da536..3b8120cca6 100644
--- a/ts/sql/migrations/index.node.ts
+++ b/ts/sql/migrations/index.node.ts
@@ -132,6 +132,7 @@ import updateToSchemaVersion1530 from './1530-update-expiring-index.std.js';
 import updateToSchemaVersion1540 from './1540-partial-expiring-index.std.js';
 import updateToSchemaVersion1550 from './1550-has-link-preview.std.js';
 import updateToSchemaVersion1560 from './1560-pinned-messages.std.js';
+import updateToSchemaVersion1561 from './1561-cleanup-polls.std.js';
 
 import { DataWriter } from '../Server.node.js';
 
@@ -1622,6 +1623,8 @@ export const SCHEMA_VERSIONS: ReadonlyArray<SchemaUpdateType> = [
   { version: 1540, update: updateToSchemaVersion1540 },
   { version: 1550, update: updateToSchemaVersion1550 },
   { version: 1560, update: updateToSchemaVersion1560 },
+  // 1561, 1551, and 1541 all refer to the same migration
+  { version: 1561, update: updateToSchemaVersion1561 },
 ];
 
 export class DBVersionFromFutureError extends Error {
diff --git a/ts/test-node/sql/migration_1561_test.node.ts b/ts/test-node/sql/migration_1561_test.node.ts
new file mode 100644
index 0000000000..8661dc1ac4
--- /dev/null
+++ b/ts/test-node/sql/migration_1561_test.node.ts
@@ -0,0 +1,80 @@
+// Copyright 2025 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+import { assert } from 'chai';
+
+import { type WritableDB } from '../../sql/Interface.std.js';
+import {
+  createDB,
+  getTableData,
+  insertData,
+  updateToVersion,
+} from './helpers.node.js';
+
+describe('SQL/updateToSchemaVersion1561', () => {
+  let db: WritableDB;
+
+  beforeEach(() => {
+    db = createDB();
+    updateToVersion(db, 1560);
+  });
+  afterEach(() => {
+    db.close();
+  });
+
+  it('removes json.poll and hasUnreadPollVotes', () => {
+    insertData(db, 'messages', [
+      {
+        id: 'message-id',
+        isErased: 0,
+        json: {
+          id: 'message-id',
+          poll: {
+            question: 'poll question',
+          },
+        },
+        hasUnreadPollVotes: 1,
+      },
+      {
+        id: 'message-id-2',
+        isErased: 1,
+        json: {
+          id: 'message-id-2',
+          poll: {
+            question: 'poll question',
+          },
+        },
+        hasUnreadPollVotes: 1,
+      },
+    ]);
+    updateToVersion(db, 1561);
+    assert.deepStrictEqual(
+      getTableData(db, 'messages').map(row => ({
+        id: row.id,
+        json: row.json,
+        isErased: row.isErased,
+        hasUnreadPollVotes: row.hasUnreadPollVotes,
+      })),
+      [
+        {
+          id: 'message-id',
+          isErased: 0,
+          json: {
+            id: 'message-id',
+            poll: {
+              question: 'poll question',
+            },
+          },
+          hasUnreadPollVotes: 1,
+        },
+        {
+          id: 'message-id-2',
+          isErased: 1,
+          json: {
+            id: 'message-id-2',
+          },
+          hasUnreadPollVotes: 0,
+        },
+      ]
+    );
+  });
+});
diff --git a/ts/util/cleanup.preload.ts b/ts/util/cleanup.preload.ts
index b7e4b0da64..732c470615 100644
--- a/ts/util/cleanup.preload.ts
+++ b/ts/util/cleanup.preload.ts
@@ -65,8 +65,10 @@ export async function eraseMessageContents(
     bodyRanges: undefined,
     contact: [],
     editHistory: undefined,
+    hasUnreadPollVotes: undefined,
     isErased: true,
     preview: [],
+    poll: undefined,
     quote: undefined,
     sticker: undefined,
     ...additionalProperties,