should update flags

back/db/utils/mail.ts

@@ -22,6 +22,12 @@ export async function getFlagId(flag: string): Promise<number> {
     return await execQueryAsyncWithId(query, values);
 }
 
+export async function getMessageIdOnUid(uid: number): Promise<{message_id: number}[]> {
+    const query = `SELECT message_id FROM mailbox_message WHERE uid = ?`;
+    const values = [uid];
+    return await execQueryAsync(query, values);
+}
+
 export async function findRoomByOwner(ownerId: number): Promise<{ room_id: number }[]> {
     const query = `SELECT room_id FROM app_room WHERE owner_id = ?`;
     const values = [ownerId];