Redesign character agent. Still missing memory storage

backend/src/chat.py

@@ -17,6 +17,12 @@ class Message:
     
     def from_db_record(record):
         return Message(record.id, record.content, record.sender, record.time)
+
+    def is_from_user(self):
+        return self.sender == "user"
+    
+    def is_from_agent(self, agent_id):
+        return self.sender == str(agent_id)
     
     def __str__(self):
         time = self.time if self.time != None else 'no-time'