Simplify story reply context

Co-authored-by: trevor-signal <131492920+trevor-signal@users.noreply.github.com>

ts/test-node/sql/migration_1760_test.node.ts

@@ -0,0 +1,79 @@
+// Copyright 2026 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import type { WritableDB } from '../../sql/Interface.std.ts';
+import { sql } from '../../sql/util.std.ts';
+import {
+  createDB,
+  updateToVersion,
+  insertData,
+  getTableData,
+  explain,
+} from './helpers.node.ts';
+
+describe('SQL/updateToSchemaVersion1760', () => {
+  let db: WritableDB;
+
+  beforeEach(() => {
+    db = createDB();
+  });
+
+  afterEach(() => {
+    db.close();
+  });
+
+  it('removes the cached attachment but preserves the author', () => {
+    updateToVersion(db, 1750);
+    insertData(db, 'messages', [
+      {
+        id: 'story_reply',
+        json: {
+          id: 'story_reply',
+          storyReplyContext: {
+            attachment: {
+              contentType: 'video/mp4',
+              path: 'path',
+              size: 100,
+            },
+            authorAci: 'author_aci',
+          },
+        },
+        storyId: 'story_id',
+      },
+    ]);
+
+    updateToVersion(db, 1760);
+
+    assert.deepStrictEqual(
+      getTableData(db, 'messages').map(msg => msg.json),
+      [
+        {
+          id: 'story_reply',
+          storyReplyContext: {
+            authorAci: 'author_aci',
+          },
+        },
+      ]
+    );
+  });
+
+  it('should use storyId index', () => {
+    updateToVersion(db, 1760);
+
+    const details = explain(
+      db,
+      sql`
+        UPDATE messages
+        SET json = json_remove(json, '$.storyReplyContext.attachment')
+        WHERE isStory = 0
+        AND storyId > '0'
+        AND json->'$.storyReplyContext.attachment' IS NOT NULL;
+        `
+    );
+
+    assert.include(details, 'USING INDEX messages_by_storyId');
+    assert.notInclude(details, 'SCAN');
+  });
+});