make_posts: Fix N+1

[sue445]

Before

https://github.com/sue445/private-isu-20231118/issues/1#issuecomment-1817774451

Sun Nov 19 16:35:25 JST 2023
{"pass":true,"score":9573,"success":9116,"fail":0,"messages":[]}
Sun Nov 19 16:36:42 JST 2023

[sue445]

:rocket: Deployed 76bef22 20231119-155239-sue445 (compare)

Sun Nov 19 15:52:46 JST 2023
{"pass":false,"score":0,"success":0,"fail":8,"messages":["リクエストがタイムアウトしました (POST /login)","リクエストがタイムアウトしました (POST /register)"]}

[sue445]

:rocket: Deployed 214dd11 20231119-163844-sue445 (compare)

Sun Nov 19 16:38:58 JST 2023
{"pass":false,"score":0,"success":2,"fail":7,"messages":["リクエストがタイムアウトしました (POST /login)","リクエストがタイムアウトしました (POST /register)"]}

[sue445]

Before

https://github.com/sue445/private-isu-20231118/issues/1#issuecomment-1817774451

Sun Nov 19 16:35:25 JST 2023
{"pass":true,"score":9573,"success":9116,"fail":0,"messages":[]}
Sun Nov 19 16:36:42 JST 2023

After

:rocket: Deployed dd4263e 20231119-222211-sue445 (compare)

Sun Nov 19 22:22:17 JST 2023
{"pass":false,"score":19602,"success":19610,"fail":2,"messages":["response code should be 200, got 500 (GET /@sara)","ステータスコードが正しくありません: expected 200, got 500 (GET /posts/10073)"]}

[sue445]

:rocket: Deployed e51ef5f 20231119-222733-sue445 (compare)

Sun Nov 19 22:27:55 JST 2023
{"pass":false,"score":19613,"success":19611,"fail":1,"messages":["ステータスコードが正しくありません: expected 200, got 404 (GET /posts/10074)"]}

[sue445]

:rocket: Deployed 9303a5b 20231119-223600-sue445 (compare)

[sue445]

:rocket: Deployed 34eb364 20231119-225147-sue445 (compare)

isucon@isucon-bench:~/private_isu.git/benchmarker$ date && ./bin/benchmarker -u ./userdata -t http://18.180.61.86/ && date
Sun Nov 19 22:51:56 JST 2023
{"pass":true,"score":3860,"success":3657,"fail":0,"messages":[]}
Sun Nov 19 22:53:15 JST 2023

[sue445]

:rocket: Deployed 3644ccc 20231119-225603-sue445 (compare)

Sun Nov 19 22:56:30 JST 2023
{"pass":true,"score":3895,"success":3692,"fail":0,"messages":[]}
Sun Nov 19 22:57:49 JST 2023