完成競賽編輯功能

lib/database-sync-fixed.js

@@ -321,6 +321,9 @@ class DatabaseSyncFixed {
 
     const connection = await this.slavePool.getConnection();
     try {
+      // 先刪除現有的關聯數據
+      await connection.execute(`DELETE FROM ${relationTable} WHERE competition_id = ?`, [competitionId]);
+      
       for (const data of relationData) {
         const [uuidResult] = await connection.execute('SELECT UUID() as id');
         const relationId = uuidResult[0].id;