editing and maintenance and user suggestions

* every user has a right of a username and a display name and has the right to change it
* System information page now shows information about database user count, char count, and database schema version
* more maintenance lists
* show the right values in columns and fields
* move similar from inside of frontend component functions to utility js when used multiple times
* display help on mouse over
* add more than one believe to character
* make char name editable with better char info in headline
* GiT Gifttoleranz value not calculated correctly
* Bump backend to 0.2.3, frontend to 0.2.2

backend/user/model.go

@@ -3,6 +3,7 @@ package user
 import (
 	"bamort/database"
 	"fmt"
+	"strings"
 	"time"
 
 	"gorm.io/gorm"
@@ -18,6 +19,7 @@ const (
 type User struct {
 	UserID             uint       `gorm:"primaryKey" json:"id"`
 	Username           string     `gorm:"unique" json:"username"`
+	DisplayName        string     `gorm:"not null;default:''" json:"display_name"`
 	PasswordHash       string     `json:"password"`
 	Email              string     `gorm:"unique" json:"email"`
 	Role               string     `gorm:"default:standard" json:"role"`
@@ -33,6 +35,10 @@ func (object *User) Create() error {
 		return fmt.Errorf("database connection is nil")
 	}
 
+	if strings.TrimSpace(object.DisplayName) == "" {
+		object.DisplayName = object.Username
+	}
+
 	err := database.DB.Transaction(func(tx *gorm.DB) error {
 		// Save the User record
 		if err := tx.Create(&object).Error; err != nil {
@@ -75,6 +81,10 @@ func (object *User) Save() error {
 		return fmt.Errorf("database connection is nil")
 	}
 
+	if strings.TrimSpace(object.DisplayName) == "" {
+		object.DisplayName = object.Username
+	}
+
 	err := database.DB.Save(&object).Error
 	if err != nil {
 		// User found
@@ -154,3 +164,10 @@ func (u *User) IsStandardUser() bool {
 func ValidateRole(role string) bool {
 	return role == RoleStandardUser || role == RoleMaintainer || role == RoleAdmin
 }
+
+func (u *User) DisplayNameOrUsername() string {
+	if strings.TrimSpace(u.DisplayName) != "" {
+		return u.DisplayName
+	}
+	return u.Username
+}