Resolved #309

[kenkoooo]

No description provided.

[codecov-io]

Codecov Report

Merging #310 into master will decrease coverage by 19.75%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #310       +/-   ##
==========================================
- Coverage   22.19%   2.43%   -19.76%     
==========================================
  Files          70      52       -18     
  Lines        1924    1314      -610     
  Branches      263     180       -83     
==========================================
- Hits          427      32      -395     
+ Misses       1430    1281      -149     
+ Partials       67       1       -66

Impacted Files	Coverage Δ
atcoder-problems-backend/src/sql/streak.rs
atcoder-problems-backend/src/sql/models.rs
...tcoder-problems-backend/src/sql/rated_point_sum.rs
...er-problems-backend/src/lambda/time_submissions.rs
atcoder-problems-backend/src/lambda/io.rs
atcoder-problems-backend/src/crawler.rs
...tcoder-problems-backend/src/sql/contest_problem.rs
...r-problems-backend/src/sql/problems_submissions.rs
atcoder-problems-backend/src/sql/simple_client.rs
atcoder-problems-backend/src/s3.rs
... and 7 more

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