Refactor Constraints

[Tigrov]

Related PRs

• Update according changes in db package db-sqlite#372
• Update according changes in db package db-mysql#409
• Update according changes in db package db-pgsql#426
• Update according changes in db package db-mssql#377
• Update according changes in db package db-oracle#343
• Update according changes in db package db-migration#297

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️
Fixed issues

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.95%. Comparing base (6f0ad98) to head (56b0902).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1004      +/-   ##
============================================
- Coverage     98.96%   98.95%   -0.02%     
+ Complexity     1641     1622      -19     
============================================
  Files           100       99       -1     
  Lines          4167     4116      -51     
============================================
- Hits           4124     4073      -51     
  Misses           43       43              

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