refactor: Update GROQ_TOPIC_MODEL for consistency and adjust fallback models in TopicService to enhance model selection and robustness.

config.py

@@ -43,7 +43,7 @@ GROQ_TTS_FORMAT = "wav"
 GROQ_CHAT_MODEL = "llama3-70b-8192"
 
 # **Topic Extraction Model**
-GROQ_TOPIC_MODEL = "llama-3.1-70b-versatile"  # Alternative: "llama3-70b-8192" or "llama-3.1-8b-instant"
+GROQ_TOPIC_MODEL = "llama3-70b-8192"  # Using same model as chat for consistency
 
 # ============ SUPABASE ============
 SUPABASE_URL = os.getenv("SUPABASE_URL", "")

services/topic_service.py

@@ -23,13 +23,13 @@ class TopicService:
     def __init__(self):
         self.llm = None
         # Use valid Groq model - defaults from config, fallback to common models
-        self.model_name = GROQ_TOPIC_MODEL if GROQ_TOPIC_MODEL else "llama-3.1-70b-versatile"
-        # Fallback models to try if primary fails
+        self.model_name = GROQ_TOPIC_MODEL if GROQ_TOPIC_MODEL else "llama3-70b-8192"
+        # Fallback models to try if primary fails (using current/available Groq models)
         self.fallback_models = [
-            "llama-3.1-70b-versatile",
             "llama3-70b-8192",
             "llama-3.1-8b-instant",
-            "mixtral-8x7b-32768"
+            "mixtral-8x7b-32768",
+            "gemma2-9b-it"  # Alternative smaller model
         ]
         self.initialized = False