diff --git a/backend/cmd/configure/bla3/prompt.go b/backend/cmd/configure/bla3/prompt.go
new file mode 100644
index 0000000000..e45a3a6da5
--- /dev/null
+++ b/backend/cmd/configure/bla3/prompt.go
@@ -0,0 +1,181 @@
+package bla3
+
+import (
+	"fmt"
+	"log/slog"
+	"reflect"
+
+	"github.com/manifoldco/promptui"
+	"github.com/spf13/viper"
+)
+
+var customType = reflect.TypeFor[Custom]()
+
+type Custom interface {
+	Configure() (value any, err error)
+}
+
+type Object struct {
+	value reflect.Value
+
+	tag fieldTag
+}
+
+func NewObject(value any) Object {
+	return Object{
+		value: reflect.Indirect(reflect.ValueOf(value)),
+	}
+}
+
+func (o *Object) Configure(v *viper.Viper) error {
+	if o.tag.label() != "" {
+		fmt.Println("\n", o.tag.label())
+	}
+	for i := range o.value.NumField() {
+		if !o.value.Type().Field(i).IsExported() {
+			continue
+		}
+		structField := o.value.Field(i)
+		tag, err := newFieldTag(o.value.Type().Field(i), structField.Interface())
+		if err != nil {
+			return err
+		}
+		if tag.skip {
+			continue
+		}
+
+		f := Field{
+			tag:         tag,
+			value:       structField,
+			structField: o.value.Type().Field(i),
+		}
+		err = f.Configure(v)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+type Field struct {
+	value reflect.Value
+
+	structField reflect.StructField
+
+	tag fieldTag
+}
+
+func NewField(value any) Field {
+	return Field{
+		value: reflect.ValueOf(value),
+	}
+}
+
+func (f *Field) validate(input string) (err error) {
+	configuredValue, err := mapValue(f.value.Type(), input)
+	if err != nil {
+		return err
+	}
+	f.value.Set(configuredValue)
+	return nil
+}
+
+func (f *Field) callCustom(v *viper.Viper) (ok bool, err error) {
+	if !f.value.Type().Implements(customType) {
+		return false, nil
+	}
+	if f.value.IsNil() {
+		f.value.Set(reflect.New(f.value.Type().Elem()))
+	}
+	custom := f.value.Interface().(Custom)
+	value, err := custom.Configure()
+	if err != nil {
+		return true, err
+	}
+	switch val := value.(type) {
+	case Field:
+		val.tag, err = newFieldTag(f.structField, val.value.Interface())
+		val.structField = f.structField
+		if err != nil {
+			return false, err
+		}
+		return true, val.Configure(v)
+	default:
+		v.Set(f.tag.fieldName, val)
+		return true, nil
+	}
+}
+
+func (f *Field) Configure(v *viper.Viper) error {
+	if ok, err := f.callCustom(v); ok || err != nil {
+		return err
+	}
+	f.value = reflect.Indirect(f.value)
+	if ok, err := f.callCustom(v); ok || err != nil {
+		return err
+	}
+
+	kind := f.value.Kind()
+	switch kind {
+	case reflect.Bool:
+		prompt := promptui.Prompt{
+			Label:     f.tag.label(),
+			IsConfirm: true,
+		}
+		_, err := prompt.Run()
+		selected := true
+		if err != nil {
+			if err.Error() != "" {
+				return err
+			}
+			selected = false
+		}
+		f.value.SetBool(selected)
+		v.Set(f.tag.fieldName, f.value.Interface())
+		return nil
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
+		reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128, reflect.String:
+
+		prompt := promptui.Prompt{
+			Label:    f.tag.label(),
+			Validate: f.validate,
+			Default:  f.tag.defaultValue(),
+		}
+		_, err := prompt.Run()
+		if err != nil {
+			return err
+		}
+		v.Set(f.tag.fieldName, f.value.Interface())
+		return nil
+	case reflect.Struct:
+		o := Object{
+			value: f.value,
+			tag:   f.tag,
+		}
+		if !v.IsSet(f.tag.fieldName) {
+			v.Set(f.tag.fieldName, map[string]any{})
+		}
+		sub := v.Sub(f.tag.fieldName)
+		err := o.Configure(sub)
+		if err != nil {
+			return err
+		}
+		v.Set(f.tag.fieldName, sub.AllSettings())
+		return nil
+	case reflect.Pointer:
+		if f.value.IsNil() {
+			f.value = reflect.New(f.value.Type().Elem())
+		}
+		f.value = f.value.Elem()
+		return f.Configure(v)
+	case reflect.Array, reflect.Slice, reflect.Map:
+		slog.Warn("skipping because kind is unimplemented", slog.String("field", f.tag.fieldName), slog.String("kind", kind.String()))
+		return nil
+	case reflect.Chan, reflect.Func, reflect.Interface, reflect.UnsafePointer, reflect.Invalid:
+		slog.Error("skipping because kind is unsupported", slog.String("field", f.tag.fieldName), slog.String("kind", kind.String()))
+		return nil
+	}
+	return nil
+}
diff --git a/backend/cmd/configure/bla3/tag.go b/backend/cmd/configure/bla3/tag.go
new file mode 100644
index 0000000000..08fa04565f
--- /dev/null
+++ b/backend/cmd/configure/bla3/tag.go
@@ -0,0 +1,81 @@
+package bla3
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+)
+
+type fieldTag struct {
+	skip bool
+
+	fieldName   string
+	description string
+
+	currentValue any
+}
+
+const (
+	tagName        = "configure"
+	defaultKey     = "default"
+	descriptionKey = "description"
+)
+
+func newFieldTag(field reflect.StructField, current any) (config fieldTag, err error) {
+	config.fieldName = field.Name
+	if current != nil {
+		config.currentValue = current
+	}
+
+	value, ok := field.Tag.Lookup(tagName)
+	if !ok {
+		if config.currentValue == nil {
+			config.currentValue = reflect.New(field.Type).Elem().Interface()
+		}
+		return config, nil
+	}
+	if value == "-" {
+		config.skip = true
+		return config, nil
+	}
+
+	fields := strings.Split(value, ",")
+	for _, f := range fields {
+		configSplit := strings.Split(f, "=")
+		switch strings.ToLower(configSplit[0]) {
+		case defaultKey:
+			config.currentValue, err = mapValue(field.Type, configSplit[1])
+			if err != nil {
+				return config, err
+			}
+		case descriptionKey:
+			config.description = configSplit[1]
+		}
+	}
+	if config.currentValue == nil {
+		config.currentValue = reflect.New(field.Type).Elem().Interface()
+	}
+
+	return config, nil
+}
+
+func (tag fieldTag) label() string {
+	if tag.fieldName == "" {
+		return ""
+	}
+	valueType := reflect.TypeOf(tag.currentValue)
+	typ := valueType.Kind().String()
+	if typeParsers[valueType] != nil {
+		typ = valueType.Name()
+	}
+
+	label := fmt.Sprintf("%s (%s)", tag.fieldName, typ)
+	if tag.description == "" {
+		return label
+	}
+	return fmt.Sprintf("%s (%s)", label, tag.description)
+}
+
+func (tag fieldTag) defaultValue() string {
+	return fmt.Sprintf("%v", tag.currentValue)
+}
diff --git a/backend/cmd/configure/bla3/update_config6.go b/backend/cmd/configure/bla3/update_config6.go
new file mode 100644
index 0000000000..126501bb0e
--- /dev/null
+++ b/backend/cmd/configure/bla3/update_config6.go
@@ -0,0 +1,140 @@
+package bla3
+
+import (
+	"fmt"
+	"os"
+	"reflect"
+	"strconv"
+	"time"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+type TestConfig struct {
+	API      APIConfig     `configure:""`
+	Database DatabaseOneOf `configure:"type=oneof"`
+}
+
+type APIConfig struct {
+	Host string `configure:""`
+	Port uint16 `configure:""`
+}
+
+type DatabaseOneOf struct {
+	ConnectionString *string         `configure:""`
+	Config           *DatabaseConfig `configure:""`
+}
+
+type DatabaseConfig struct {
+	Host    string `configure:""`
+	Port    uint16 `configure:""`
+	SSLMode string `configure:""`
+}
+
+func Update(v *viper.Viper, config any) func(cmd *cobra.Command, args []string) {
+	return func(cmd *cobra.Command, args []string) {
+		s := NewObject(config)
+		if err := s.Configure(v); err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+		err := v.WriteConfig()
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+	}
+}
+
+var typeParsers = map[reflect.Type]func(string) (any, error){
+	reflect.TypeFor[time.Duration](): func(value string) (any, error) {
+		return time.ParseDuration(value)
+	},
+	reflect.TypeFor[time.Time](): func(value string) (any, error) {
+		if t, err := time.Parse(time.DateTime, value); err == nil {
+			return t, nil
+		}
+		if t, err := time.Parse(time.DateOnly, value); err == nil {
+			return t, nil
+		}
+		if t, err := time.Parse(time.TimeOnly, value); err == nil {
+			return t, nil
+		}
+		return time.Parse(time.RFC3339, value)
+	},
+}
+
+func SetTypeParser[T any](fn func(string) (any, error)) {
+	typeParsers[reflect.TypeFor[T]()] = fn
+}
+
+func mapValue(typ reflect.Type, value string) (v reflect.Value, err error) {
+	if fn, ok := typeParsers[typ]; ok {
+		mappedValue, err := fn(value)
+		if err != nil {
+			return v, err
+		}
+		res := reflect.ValueOf(mappedValue)
+		if !res.CanConvert(typ) {
+			return v, fmt.Errorf("cannot convert %T to %s", mappedValue, typ.Kind().String())
+		}
+		return res.Convert(typ), nil
+	}
+
+	var val any
+	switch typ.Kind() {
+	case reflect.String:
+		val = value
+	case reflect.Bool:
+		val, err = strconv.ParseBool(value)
+	case reflect.Int:
+		val, err = strconv.Atoi(value)
+	case reflect.Int8:
+		val, err = strconv.ParseInt(value, 10, 8)
+		val = int8(val.(int64))
+	case reflect.Int16:
+		val, err = strconv.ParseInt(value, 10, 16)
+		val = int16(val.(int64))
+	case reflect.Int32:
+		val, err = strconv.ParseInt(value, 10, 32)
+		val = int32(val.(int64))
+	case reflect.Int64:
+		val, err = strconv.ParseInt(value, 10, 64)
+	case reflect.Uint:
+		val, err = strconv.ParseUint(value, 10, 0)
+		val = uint(val.(uint64))
+	case reflect.Uint8:
+		val, err = strconv.ParseUint(value, 10, 8)
+		val = uint8(val.(uint64))
+	case reflect.Uint16:
+		val, err = strconv.ParseUint(value, 10, 16)
+		val = uint16(val.(uint64))
+	case reflect.Uint32:
+		val, err = strconv.ParseUint(value, 10, 32)
+		val = uint32(val.(uint64))
+	case reflect.Uint64:
+		val, err = strconv.ParseUint(value, 10, 64)
+	case reflect.Float32:
+		val, err = strconv.ParseFloat(value, 32)
+		val = float32(val.(float64))
+	case reflect.Float64:
+		val, err = strconv.ParseFloat(value, 64)
+	case reflect.Complex64:
+		val, err = strconv.ParseComplex(value, 64)
+		val = complex64(val.(complex128))
+	case reflect.Complex128:
+		val, err = strconv.ParseComplex(value, 128)
+	default:
+		return v, fmt.Errorf("unsupported type: %s", typ.Kind().String())
+	}
+	if err != nil {
+		return v, err
+	}
+
+	res := reflect.ValueOf(val)
+	if !res.CanConvert(typ) {
+		return v, fmt.Errorf("cannot convert %T to %s", val, typ.Kind().String())
+	}
+	return res.Convert(typ), nil
+}