fix(db): revert use_new_connection=True

[shcheklein]

Trying to revert based on #804 (comment)

[cloudflare-workers-and-pages]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.44%. Comparing base (5b15006) to head (12da0c9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #805   +/-   ##
=======================================
  Coverage   87.44%   87.44%           
=======================================
  Files         128      128           
  Lines       11369    11369           
  Branches     1535     1535           
=======================================
  Hits         9942     9942           
  Misses       1048     1048           
  Partials      379      379           

Flag	Coverage Δ
datachain	87.38% <100.00%> (ø)

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