functionality tests mostly pass

backend/app/api/v1/endpoints/prompts.py

@@ -25,6 +25,10 @@ class FillPoolResponse(BaseModel):
     total_in_pool: int
     target_volume: int
 
+class SelectPromptRequest(BaseModel):
+    """Request model for selecting a prompt."""
+    prompt_text: str
+
 class SelectPromptResponse(BaseModel):
     """Response model for selecting a prompt."""
     selected_prompt: str
@@ -155,29 +159,35 @@ async def get_prompt_history(
             detail=f"Error getting prompt history: {str(e)}"
         )
 
-@router.post("/select/{prompt_index}")
+@router.post("/select", response_model=SelectPromptResponse)
 async def select_prompt(
-    prompt_index: int,
+    request: SelectPromptRequest,
     prompt_service: PromptService = Depends(get_prompt_service)
 ):
     """
-    Select a prompt from drawn prompts to add to history.
+    Select a prompt to add to history.
+
+    Adds the provided prompt text to the historic prompts cyclic buffer.
+    The prompt will be added at position 0 (most recent), shifting existing prompts down.
 
     Args:
-        prompt_index: Index of the prompt to select (0-based)
+        request: SelectPromptRequest containing the prompt text
 
     Returns:
-        Confirmation of prompt selection
+        Confirmation of prompt selection with position in history
     """
     try:
-        # This endpoint would need to track drawn prompts in session
-        # For now, we'll implement a simplified version
-        raise HTTPException(
-            status_code=status.HTTP_501_NOT_IMPLEMENTED,
-            detail="Prompt selection not yet implemented"
+        # Add the prompt to history
+        position_key = await prompt_service.add_prompt_to_history(request.prompt_text)
+
+        # Get updated history stats
+        history_stats = await prompt_service.get_history_stats()
+
+        return SelectPromptResponse(
+            selected_prompt=request.prompt_text,
+            position_in_history=position_key,
+            history_size=history_stats.total_prompts
         )
-    except HTTPException:
-        raise
     except Exception as e:
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,