[ISSUE #3180] Remove default datetime of the h2、mysql、pg.

[ShawnJim]

ref #3180 .

[codecov-commenter]

Codecov Report

Merging #3184 (f1744db) into master (9e163a6) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3184      +/-   ##
============================================
- Coverage     57.52%   57.47%   -0.05%     
+ Complexity     4532     4530       -2     
============================================
  Files           730      730              
  Lines         20818    20818              
  Branches       1915     1915              
============================================
- Hits          11976    11966      -10     
- Misses         7792     7803      +11     
+ Partials       1050     1049       -1     

Impacted Files	Coverage Δ
...henyu/admin/service/impl/UpstreamCheckService.java	62.85% <0.00%> (-7.15%)	⬇️

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