Paginate and add search to the newsletter signups endpoint

Unlike guest book and free-text, newsletter signups had no LIMIT at all and the frontend rendered every row in one plain table. Newsletter opt-in is a single checkbox rather than typed text, so it's plausibly the largest per-event list - fix it the same way as guest book: paginated (page/pageSize, capped at 200/page) plus an optional ?search= over first name, last name, and email.

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

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

@@ -248,17 +248,33 @@ export const deleteSubmission = async (submissionId: number): Promise<boolean> =
 	}
 };
 
-export const getNewsletterSignups = async (eventId: number): Promise<NewsletterSignupRow[]> => {
+export const getNewsletterSignups = async (
+	eventId: number,
+	page: number,
+	pageSize: number,
+	search?: string
+): Promise<{entries: NewsletterSignupRow[]; total: number}> => {
 	let conn = await NachklangFeedbackDB.getConnection();
 	try {
+		const trimmedSearch = search?.trim();
+		const whereClause = trimmedSearch
+			? 'WHERE event_id = ? AND (first_name LIKE ? ESCAPE \'\\\\\' OR last_name LIKE ? ESCAPE \'\\\\\' OR email LIKE ? ESCAPE \'\\\\\')'
+			: 'WHERE event_id = ?';
+		const likeParam = trimmedSearch ? `%${escapeLikeTerm(trimmedSearch)}%` : undefined;
+		const whereParams = trimmedSearch ? [eventId, likeParam, likeParam, likeParam] : [eventId];
+
+		const totalRows = await conn.query(`SELECT COUNT(*) as cnt FROM newsletter_signups ${whereClause}`, whereParams);
 		const rows = await conn.query(
-			'SELECT signup_id, first_name, last_name, email, consent_at, sync_status, last_error FROM newsletter_signups WHERE event_id = ? ORDER BY consent_at DESC',
-			[eventId]
+			`SELECT signup_id, first_name, last_name, email, consent_at, sync_status, last_error FROM newsletter_signups ${whereClause} ORDER BY consent_at DESC LIMIT ? OFFSET ?`,
+			[...whereParams, pageSize, (page - 1) * pageSize]
 		);
-		return rows.map((r: any) => ({
-			signupId: r.signup_id, firstName: r.first_name, lastName: r.last_name, email: r.email,
-			consentAt: r.consent_at, syncStatus: r.sync_status, lastError: r.last_error
-		}));
+		return {
+			total: Number(totalRows[0].cnt),
+			entries: rows.map((r: any) => ({
+				signupId: r.signup_id, firstName: r.first_name, lastName: r.last_name, email: r.email,
+				consentAt: r.consent_at, syncStatus: r.sync_status, lastError: r.last_error
+			}))
+		};
 	} finally {
 		await conn.end();
 	}