Improve column schema classes

[Tigrov]

Related PR

• Improve column schema classes db#899

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 99.73%. Comparing base (7054c55) to head (afb176b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #371   +/-   ##
=========================================
  Coverage     99.73%   99.73%           
  Complexity      248      248           
=========================================
  Files            27       27           
  Lines           757      757           
=========================================
  Hits            755      755           
  Misses            2        2           

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