Overhaul [1/n]

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/utils/utils.go

@@ -2,7 +2,6 @@ package utils
 
 import (
 	"encoding/base64"
-	"honoka-chan/pkg/db"
 	"honoka-chan/pkg/encrypt"
 )
 
@@ -12,13 +11,6 @@ func CheckErr(err error) {
 	}
 }
 
-func IsSigned(unitId int) bool {
-	exists, err := db.MainEng.Table("unit_sign_asset_m").Where("unit_id = ?", unitId).Exist()
-	CheckErr(err)
-
-	return exists
-}
-
 func GenXMS(resp []byte) string {
 	return base64.StdEncoding.EncodeToString(encrypt.RSASignSHA1(resp))
 }