add:reply system

backend/drizzle/0005_flowery_northstar.sql

@@ -0,0 +1,10 @@
+CREATE TABLE `ticket_replies` (
+	`id` text PRIMARY KEY NOT NULL,
+	`ticketId` text NOT NULL,
+	`userId` text,
+	`body` text NOT NULL,
+	`authorRole` text DEFAULT 'user' NOT NULL,
+	`createdAt` text NOT NULL,
+	FOREIGN KEY (`ticketId`) REFERENCES `tickets`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`userId`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE set null
+);