Composer fallbacks: three distinct verified providers, per-provider timeouts, attempt logging

app.py

@@ -502,11 +502,17 @@ def _llm_json(system, user):
     from openai import OpenAI
 
     # Bounded timeout: a hung provider must fail over, not freeze the UI at the composing step.
-    client = OpenAI(base_url="https://router.huggingface.co/v1", api_key=os.environ["HF_TOKEN"], timeout=60, max_retries=0)
+    client = OpenAI(base_url="https://router.huggingface.co/v1", api_key=os.environ["HF_TOKEN"], max_retries=0)
     last_error = None
-    for model in ("deepseek-ai/DeepSeek-V4-Flash-0731:baseten", "deepseek-ai/DeepSeek-V4-Flash-0731", "deepseek-ai/DeepSeek-V4-Flash-0731:fastest"):
+    # Three DISTINCT providers, all verified enabled for this account (bare/":fastest" can route to
+    # together, which 403s here and killed the fallbacks). Timeouts sized to measured composer latency.
+    for model, timeout in (
+        ("deepseek-ai/DeepSeek-V4-Flash-0731:baseten", 45),
+        ("deepseek-ai/DeepSeek-V4-Flash-0731:deepinfra", 75),
+        ("deepseek-ai/DeepSeek-V4-Flash-0731:novita", 100),
+    ):
         try:
-            completion = client.chat.completions.create(
+            completion = client.with_options(timeout=timeout).chat.completions.create(
                 model=model,
                 messages=[{"role": "system", "content": system}, {"role": "user", "content": user}],
             )
@@ -517,9 +523,10 @@ def _llm_json(system, user):
                 raise ValueError(f"no JSON object in composer reply (finish_reason={completion.choices[0].finish_reason})")
             return _json.loads(text[start : end + 1])
         except Exception as e:
+            print(f"composer attempt failed ({model}): {type(e).__name__}: {e}", flush=True)
             last_error = e
     raise gr.Error(
-        "The MiniMax-M3 composer is overloaded right now — try again in a moment, "
+        "The composer model is overloaded right now — try again in a moment, "
         "or write the lyrics and structured prompt directly in the Studio tab."
     ) from last_error