Merge pull request #2202 from Michael-Jetson/main

新增三大功能：兑换码邀请返利、批量修改用户并发数、Markdown页面渲染

backend/internal/repository/user_repo.go

@@ -737,6 +737,37 @@ func (r *userRepository) UpdateConcurrency(ctx context.Context, id int64, amount
 	return nil
 }
 
+func (r *userRepository) BatchSetConcurrency(ctx context.Context, userIDs []int64, value int) (int, error) {
+	if len(userIDs) == 0 {
+		return 0, nil
+	}
+	if value < 0 {
+		value = 0
+	}
+	res, err := r.sql.ExecContext(ctx,
+		"UPDATE users SET concurrency = $1, updated_at = NOW() WHERE id = ANY($2) AND deleted_at IS NULL",
+		value, pq.Array(userIDs))
+	if err != nil {
+		return 0, fmt.Errorf("batch set concurrency: %w", err)
+	}
+	affected, _ := res.RowsAffected()
+	return int(affected), nil
+}
+
+func (r *userRepository) BatchAddConcurrency(ctx context.Context, userIDs []int64, delta int) (int, error) {
+	if len(userIDs) == 0 {
+		return 0, nil
+	}
+	res, err := r.sql.ExecContext(ctx,
+		"UPDATE users SET concurrency = GREATEST(concurrency + $1, 0), updated_at = NOW() WHERE id = ANY($2) AND deleted_at IS NULL",
+		delta, pq.Array(userIDs))
+	if err != nil {
+		return 0, fmt.Errorf("batch add concurrency: %w", err)
+	}
+	affected, _ := res.RowsAffected()
+	return int(affected), nil
+}
+
 func (r *userRepository) ExistsByEmail(ctx context.Context, email string) (bool, error) {
 	return r.client.User.Query().Where(userEmailLookupPredicate(email)).Exist(ctx)
 }