refactor(db): move mysql to postgres

[wuhan005]

No description provided.

[codecov-commenter]

Codecov Report

Merging #119 (eaced95) into master (0051d25) will increase coverage by 0.59%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
+ Coverage   63.59%   64.18%   +0.59%     
==========================================
  Files           6        6              
  Lines         217      215       -2     
==========================================
  Hits          138      138              
+ Misses         72       70       -2     
  Partials        7        7              

Flag	Coverage Δ
unittests	64.18% <0.00%> (+0.59%)	⬆️

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Impacted Files	Coverage Δ
internal/db/db.go	0.00% <0.00%> (ø)

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