feat: set default last n on redisadapter

cognee/infrastructure/databases/cache/cache_db_interface.py

@@ -58,7 +58,7 @@ class CacheDBInterface(ABC):
         pass
 
     @abstractmethod
-    async def get_latest_qa(self, user_id: str, session_id: str, last_n: int = 10):
+    async def get_latest_qa(self, user_id: str, session_id: str, last_n: int = 5):
         """
         Retrieve the most recent Q/A/context triplets for a session.
         """

cognee/infrastructure/databases/cache/redis/RedisAdapter.py

@@ -157,7 +157,7 @@ class RedisAdapter(CacheDBInterface):
             logger.error(error_msg)
             raise CacheConnectionError(error_msg) from e
 
-    async def get_latest_qa(self, user_id: str, session_id: str, last_n: int = 10):
+    async def get_latest_qa(self, user_id: str, session_id: str, last_n: int = 5):
         """
         Retrieve the most recent Q/A/context triplet(s) for the given session.
         """