diff --git a/api/advent22_api/core/config.py b/api/advent22_api/core/config.py
index 18af325..0c873e6 100644
--- a/api/advent22_api/core/config.py
+++ b/api/advent22_api/core/config.py
@@ -16,6 +16,9 @@ class User(BaseModel):
 
 class TransformedString(BaseModel):
     class __Whitespace(str, Enum):
+        # unverändert
+        KEEP = "KEEP"
+
         # Leerzeichen an Anfang und Ende entfernen
         STRIP = "STRIP"
 
@@ -23,6 +26,9 @@ class TransformedString(BaseModel):
         IGNORE = "IGNORE"
 
     class __Case(str, Enum):
+        # unverändert
+        KEEP = "KEEP"
+
         # GROSSBUCHSTABEN
         UPPER = "UPPER"
 
@@ -34,13 +40,12 @@ class TransformedString(BaseModel):
 
     value: str
 
-    whitespace: __Whitespace | None = __Whitespace.IGNORE
-    case: __Case | None = __Case.UPPER
+    whitespace: __Whitespace = __Whitespace.IGNORE
+    case: __Case = __Case.UPPER
 
     @field_validator("whitespace", "case", mode="before")
-    def transform_from_str(cls, v) -> str | None:
-        if (result := str(v).upper()) != "KEEP":
-            return result
+    def transform_from_str(cls, v) -> str:
+        return str(v).upper()
 
     @property
     def clean(self) -> str:
diff --git a/api/advent22_api/routers/admin.py b/api/advent22_api/routers/admin.py
index 26928fe..63b523f 100644
--- a/api/advent22_api/routers/admin.py
+++ b/api/advent22_api/routers/admin.py
@@ -24,8 +24,8 @@ async def is_admin(
 class ConfigModel(BaseModel):
     class __Solution(BaseModel):
         value: str
-        whitespace: str | None
-        case: str | None
+        whitespace: str
+        case: str
         clean: str
 
     class __Puzzle(BaseModel):
diff --git a/ui/src/components/admin/ConfigView.vue b/ui/src/components/admin/ConfigView.vue
index 21d9b17..80c77ae 100644
--- a/ui/src/components/admin/ConfigView.vue
+++ b/ui/src/components/admin/ConfigView.vue
@@ -179,8 +179,8 @@ export default class extends Vue {
   public config_model: ConfigModel = {
     solution: {
       value: "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
-      whitespace: null,
-      case: null,
+      whitespace: "KEEP",
+      case: "KEEP",
       clean: "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
     },
     puzzle: {
diff --git a/ui/src/lib/api.ts b/ui/src/lib/api.ts
index 5da1534..d8f358a 100644
--- a/ui/src/lib/api.ts
+++ b/ui/src/lib/api.ts
@@ -1,8 +1,8 @@
 export interface ConfigModel {
   solution: {
     value: string;
-    whitespace: string | null;
-    case: string | null;
+    whitespace: string;
+    case: string;
     clean: string;
   };
   puzzle: {