fix: update audio processing endpoint to default options to all-off when missing

app/routes/data_processing.py

@@ -46,18 +46,22 @@ async def _process_rate_limit(request: Request) -> None:
 @router.post("/audio", dependencies=[Depends(_process_rate_limit)])
 async def process_audio_endpoint(
     file: UploadFile = File(...),
-    options: str = Form(...)
+    options: str = Form(default="{}")
 ):
     """
     Process an audio file with the given augmentation options.
     Returns the processed WAV file.
+    options is a JSON string; if missing or empty, defaults to all-off.
     """
     MAX_PAYLOAD_BYTES = 30 * 1024 * 1024  # 30 MB
     logger.info(f"Received audio processing request for file: {file.filename}")
 
     # Parse options JSON string into validated Pydantic model
+    raw_options = options.strip() if options else "{}"
+    if not raw_options:
+        raw_options = "{}"
     try:
-        parsed_options = AudioAugmentationOptions.model_validate_json(options)
+        parsed_options = AudioAugmentationOptions.model_validate_json(raw_options)
     except (ValidationError, json.JSONDecodeError) as e:
         raise HTTPException(
             status_code=422,

tests/test_data_processing.py

@@ -90,3 +90,13 @@ def test_audio_accepts_camel_case_options(client: TestClient) -> None:
         files={"file": ("test.wav", _fake_audio(), "audio/wav")},
     )
     assert response.status_code != 422
+
+
+def test_audio_defaults_when_options_missing(client: TestClient) -> None:
+    """Missing options field should default to all-off, not 422."""
+    response = client.post(
+        "/api/process/audio",
+        files={"file": ("test.wav", _fake_audio(), "audio/wav")},
+    )
+    # Should proceed to processing (200) or processing error — never 422
+    assert response.status_code != 422