更改用户初始化逻辑, 使初始化过程无状态, 可执行多次

[LeoQuote]

修复bug #291

[codecov]

Codecov Report

Merging #293 into master will increase coverage by 0.35%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #293      +/-   ##
==========================================
+ Coverage   84.08%   84.43%   +0.35%     
==========================================
  Files          66       66              
  Lines        8627     8643      +16     
==========================================
+ Hits         7254     7298      +44     
+ Misses       1373     1345      -28

Impacted Files	Coverage Δ
common/auth.py	68.75% <100%> (+24.01%)	⬆️
common/tests.py	100% <100%> (ø)	⬆️
sql/tests.py	95.88% <100%> (+0.03%)	⬆️

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