Update fixtures according to tests

[Tigrov]

• Main PR Batch insert with empty columns db#795

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (65497c3) 99.04% compared to head (250e0f2) 99.04%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #316   +/-   ##
=========================================
  Coverage     99.04%   99.04%           
  Complexity      174      174           
=========================================
  Files            13       13           
  Lines           524      524           
=========================================
  Hits            519      519           
  Misses            5        5           

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[what-the-diff]

PR Summary

• Added new columns in test database
  The mysql test database has been updated with new columns: a 'float_col' which accepts double type values with precision up to 4 places and scale of 3, and a 'char_col' that can store character string of up to 100 characters, and a 'bool_col' which is a bit type and can store boolean values.

• Removed columns from test database
  A couple of columns, 'char_col' and 'float_col', which were previously in the test database, have been removed. This simplifies the database structure and aligns it with the changes made in the application.