feat(support): filter waiting tickets and staff assignments

src/lib/admin/ticket-desk-query.ts

@@ -0,0 +1,20 @@
+import { and, eq, isNotNull, isNull, ne, type SQL, sql } from "drizzle-orm";
+import { WebsiteTicket } from "@/lib/db";
+
+/** Messages persist their staff role at send time; later rank changes do not alter the queue. */
+export const latestTicketReplyIsStaff = sql<number>`COALESCE((SELECT m.is_staff FROM website_ticket_messages m WHERE m.ticket_id = ${WebsiteTicket.id} ORDER BY m.created_at DESC, m.id DESC LIMIT 1), 0)`;
+export const latestTicketReplyAt = sql<string>`COALESCE((SELECT m.created_at FROM website_ticket_messages m WHERE m.ticket_id = ${WebsiteTicket.id} ORDER BY m.created_at DESC, m.id DESC LIMIT 1), ${WebsiteTicket.createdAt})`;
+export const awaitingStaffCondition = and(
+	ne(WebsiteTicket.status, "closed"),
+	eq(latestTicketReplyIsStaff, 0),
+);
+
+export function ticketAssignmentCondition(
+	value: string | undefined,
+	userId: number,
+): SQL | undefined {
+	if (value === "mine") return eq(WebsiteTicket.assigneeId, userId);
+	if (value === "unassigned") return isNull(WebsiteTicket.assigneeId);
+	if (value === "assigned") return isNotNull(WebsiteTicket.assigneeId);
+	return undefined;
+}