Fix the timezone issues when pulling records from file db.

[wtgee]

Description

Quick fix to the timezone issues discussed in #821. This can close #821 for now but as mentioned in the Issue there might be a better solution on the insertion of the dates rather than the extraction.

Related Issue

#821

Types of changes

• Bug fix (non-breaking change which fixes an issue)

[codecov]

Codecov Report

Merging #829 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #829   +/-   ##
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  Coverage    81.25%   81.25%           
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  Files           68       68           
  Lines         5516     5516           
  Branches       759      759           
========================================
  Hits          4482     4482           
  Misses         837      837           
  Partials       197      197

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[AnthonyHorton]

This is probably OK as a quick fix for the problem at hand, but as I note in #821 (comment) the .replace(tzinfo=None) is stripping the timezone info without first converting to UTC. If timestamps in timezones other than UTC ever ended up in the DB then this would cause errors.