Add search to the admin guest book endpoint

At scale (many submissions after a concert), paging through the guest book 20 entries at a time with no way to find a specific person is impractical. Add an optional ?search= query param that filters entries whose name or message contains the term (case-insensitive), with LIKE wildcards escaped so a literal % or _ in a search term can't be misinterpreted as a pattern.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/models/feedback/admin/reports.admin.router.ts

@@ -82,6 +82,11 @@ reportsAdminRouter.get('/:eventId/report', async (req: Request, res: Response) =
  *                name: pageSize
  *                schema:
  *                    type: integer
+ *              - in: query
+ *                name: search
+ *                description: Filters entries whose name or message contains this text (case-insensitive).
+ *                schema:
+ *                    type: string
  *          responses:
  *              200:
  *                  description: Success
@@ -92,7 +97,8 @@ reportsAdminRouter.get('/:eventId/guestbook', async (req: Request, res: Response
 	try {
 		const page = Math.max(1, Number(req.query.page) || 1);
 		const pageSize = Math.min(200, Math.max(1, Number(req.query.pageSize) || 50));
-		const result = await ReportsAdminService.getGuestBookEntries(Number(req.params.eventId), page, pageSize);
+		const search = typeof req.query.search === 'string' ? req.query.search : undefined;
+		const result = await ReportsAdminService.getGuestBookEntries(Number(req.params.eventId), page, pageSize, search);
 		res.status(200).send(result);
 	} catch (e: any) {
 		sendServerError(res, e);

src/models/feedback/admin/reports.admin.service.ts

@@ -166,13 +166,29 @@ export interface GuestBookEntry {
 	message: string | null;
 }
 
-export const getGuestBookEntries = async (eventId: number, page: number, pageSize: number): Promise<{entries: GuestBookEntry[]; total: number}> => {
+// Escapes LIKE wildcards (% and _) so a search term is matched literally,
+// not interpreted as a pattern - a search for "50%" must not match everything.
+const escapeLikeTerm = (term: string) => term.replace(/[\\%_]/g, (c) => `\\${c}`);
+
+export const getGuestBookEntries = async (
+	eventId: number,
+	page: number,
+	pageSize: number,
+	search?: string
+): Promise<{entries: GuestBookEntry[]; total: number}> => {
 	let conn = await NachklangFeedbackDB.getConnection();
 	try {
-		const totalRows = await conn.query('SELECT COUNT(*) as cnt FROM guest_book_entries WHERE event_id = ?', [eventId]);
+		const trimmedSearch = search?.trim();
+		const whereClause = trimmedSearch
+			? 'WHERE event_id = ? AND (display_name LIKE ? ESCAPE \'\\\\\' OR message LIKE ? ESCAPE \'\\\\\')'
+			: 'WHERE event_id = ?';
+		const likeParam = trimmedSearch ? `%${escapeLikeTerm(trimmedSearch)}%` : undefined;
+		const whereParams = trimmedSearch ? [eventId, likeParam, likeParam] : [eventId];
+
+		const totalRows = await conn.query(`SELECT COUNT(*) as cnt FROM guest_book_entries ${whereClause}`, whereParams);
 		const rows = await conn.query(
-			'SELECT entry_id, submission_id, created_at, display_name, message FROM guest_book_entries WHERE event_id = ? ORDER BY created_at DESC LIMIT ? OFFSET ?',
+			`SELECT entry_id, submission_id, created_at, display_name, message FROM guest_book_entries ${whereClause} ORDER BY created_at DESC LIMIT ? OFFSET ?`,
-			[eventId, pageSize, (page - 1) * pageSize]
+			[...whereParams, pageSize, (page - 1) * pageSize]
 		);
 		return {
 			total: Number(totalRows[0].cnt),