[Bug]: In concurrent scenarios, there is a high possibility of repeatedly creating memory

[Ripcord55]

Describe the bug

When creating memory concurrently, there is a high probability of creating duplicate memories, such as those with the same user_id or document.

Environment

0.3.0

Fast reproduce steps

1、Create a Lua script file
vim create_memory.lua

counter = 0
  
request = function()
   counter = counter + 1
   wrk.method = "POST"
   wrk.body = '{"content":"Alice likes coffee","user_id":"user' .. counter .. '","agent_id":"agent1","run_id":"run1","metadata":{"key":"value"},"infer":true}'
   wrk.headers["X-API-Key"] = "key1"
   wrk.headers["Content-Type"] = "application/json"
   return wrk.format(nil)
end

2、Use wrk to call Lua scripts for concurrent testing
wrk -t4 -c50 -d1s -s create_memory.lua http://localhost:8000/api/v1/memories

Expected behavior

No repetitive memorization

Actual behavior

No response

Additional context

No response