fix: issues caused by no reading default use_redis from env

Author: tangg555

src/memos/mem_scheduler/schemas/general_schemas.py

@@ -1,3 +1,5 @@
+import os
+
 from pathlib import Path
 
 
@@ -21,7 +23,7 @@
 DEFAULT_MAX_INTERNAL_MESSAGE_QUEUE_SIZE = -1
 DEFAULT_TOP_K = 5
 DEFAULT_CONTEXT_WINDOW_SIZE = 5
-DEFAULT_USE_REDIS_QUEUE = True
+DEFAULT_USE_REDIS_QUEUE = os.getenv("MEMSCHEDULER_USE_REDIS_QUEUE", "False").lower() == "true"
 DEFAULT_MULTI_TASK_RUNNING_TIMEOUT = 30
 DEFAULT_SCHEDULER_RETRIEVER_BATCH_SIZE = 20
 DEFAULT_SCHEDULER_RETRIEVER_RETRIES = 1

src/memos/mem_scheduler/task_schedule_modules/redis_queue.py

@@ -785,7 +785,7 @@ def qsize(self) -> dict:
             Total number of messages across all matching streams.
         """
         if not self._redis_conn:
-            return 0
+            return {}
 
         total_size = 0
         try: