Entire logging rework. Full error handling. Small improvements.

models/clan.go

@@ -2,7 +2,7 @@ package models
 
 type Clan struct {
 	ID          uint   `json:"id" gorm:"primary_key"`
-	Name        string `json:"name"`
-	Tag         string `json:"tag"`
+	Name        string `json:"name" gorm:"unique"`
+	Tag         string `json:"tag" gorm:"unique"`
 	KeepUpdated bool   `json:"keep_updated"`
 }