高度なデータベース管理は本番環境で活用することが少ないため削除

[nanasess]

Resolves #823

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.70%. Comparing base (f43b810) to head (afc7b7f).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1088   +/-   ##
=======================================
  Coverage   51.70%   51.70%           
=======================================
  Files          80       80           
  Lines       10222    10222           
=======================================
  Hits         5285     5285           
  Misses       4937     4937           

Flag	Coverage Δ
tests	51.70% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.