reranker activation configuration

src/know_lang_bot/chat_bot/chat_graph.py

@@ -237,6 +237,9 @@ class RetrieveContextNode(BaseNode[ChatGraphState, ChatGraphDeps, ChatResult]):
 
             # Second pass: Rerank the candidates
             try:
+                if not ctx.deps.config.reranker.enabled:
+                    raise Exception("Reranker is disabled")
+                
                 # Second pass: Rerank candidates
                 reranking = await self._rerank_chunks(
                     query=query,

src/know_lang_bot/config.py

@@ -144,6 +144,10 @@ class DBConfig(BaseSettings):
     )
 
 class RerankerConfig(BaseSettings):
+    enabled: bool = Field(
+        default=True,
+        description="Enable reranking"
+    )
     model_name: str = Field(
         default="reranker",
         description="Name of the reranker model to use"