db: atomically create output file

[skshetry]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (426a714) 90.47% compared to head (11da1b6) 90.48%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10224   +/-   ##
=======================================
  Coverage   90.47%   90.48%           
=======================================
  Files         492      492           
  Lines       37614    37621    +7     
  Branches     5451     5454    +3     
=======================================
+ Hits        34033    34040    +7     
  Misses       2953     2953           
  Partials      628      628           

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