update

backend/models.py

@@ -160,10 +160,14 @@ class ProgressResponse(BaseModel):
 
 # --- Baustein-Lernen ---
 
+VertiefungArt = Literal["vertiefung", "deepdive"]
+
+
 class VertiefungRequest(BaseModel):
     topic: str = Field(min_length=1, max_length=100)
     baustein: str = Field(min_length=1, max_length=200)
     section: str = Field(default="", max_length=20000)
+    art: VertiefungArt = "vertiefung"
     provider: ProviderType = "claude"
 
 
@@ -202,6 +206,7 @@ class BausteinLernstand(BaseModel):
     gute_antworten: int
     absolviert: bool
     vertiefung: bool
+    deepdive: bool
 
 
 class BausteinLernstandResponse(BaseModel):