feat sn 改成 int64

internal/dao/repository/records.go

@@ -32,7 +32,7 @@ func (d *RecordDao) Create(record *model.Record) (*model.Record, error) {
 }
 
 type RecordItem struct {
-	QuestionSn     string    `gorm:"column:question_sn"`
+	QuestionSn     int64     `gorm:"column:question_sn"`
 	Question       string    `gorm:"column:question"`
 	Difficulty     int32     `gorm:"column:difficulty"`
 	Category       string    `gorm:"column:category"`
@@ -42,7 +42,7 @@ type RecordItem struct {
 	CreatedAt      time.Time `gorm:"column:created_at"`
 }
 
-func (d *RecordDao) FindByUSN(usn string, page, pageSize int) ([]*RecordItem, int64, error) {
+func (d *RecordDao) FindByUSN(usn int64, page, pageSize int) ([]*RecordItem, int64, error) {
 	result := make([]*RecordItem, 0)
 	count, err := d.query.Record.WithContext(d.ctx).
 		Select(