Add DEMO feature to the project

shared/alerts/base_service.py

@@ -144,7 +144,8 @@ class BaseAlertService:
                 else:
                     # Already leader - try to extend the lock
                     current_value = await self.redis.get(lock_key)
-                    if current_value and current_value.decode() == instance_id:
+                    # Note: decode_responses=True means Redis returns strings, not bytes
+                    if current_value and current_value == instance_id:
                         # Still our lock, extend it using a Lua script for atomicity
                         lua_script = """
                         if redis.call("GET", KEYS[1]) == ARGV[1] then