Add user info service

Signed-off-by: Asai Neko <sugar@sne.moe>

data/user.go

@@ -25,7 +25,7 @@ func (self *User) GetByEmail(email string) error {
 	return nil
 }
 
-func (self *User) GetByUserId(userId string) error {
+func (self *User) GetByUserId(userId uuid.UUID) error {
 	if err := Database.Where("user_id = ?", userId).First(&self).Error; err != nil {
 		return err
 	}