update delete behavior when have thread and beautify code

back/db/message/message-db.ts

@@ -0,0 +1,23 @@
+import { execQueryAsync } from "../db";
+
+export async function getFlagsOnUid(uid: number): Promise<{ flag_id: number; flag_name: string }[]> {
+    const query = `
+        SELECT * FROM flag_name
+        INNER JOIN flag ON flag.flag_id = flag_name.flag_id
+        INNER JOIN mailbox_message ON mailbox_message.message_id = flag.message_id
+        WHERE mailbox_message.uid = ?
+    `;
+    const values = [uid];
+    return await execQueryAsync(query, values);
+}
+
+export async function getFlagsOnId(messageId: number): Promise<{ flag_id: number; flag_name: string }[]> {
+    const query = `
+        SELECT * FROM flag_name
+        INNER JOIN flag ON flag.flag_id = flag_name.flag_id
+        INNER JOIN mailbox_message ON mailbox_message.message_id = flag.message_id
+        WHERE mailbox_message.message_id = ?
+    `;
+    const values = [messageId];
+    return await execQueryAsync(query, values);
+}