Add a flush command

[Viicos]

Fixes #26

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 5 lines in your changes missing coverage. Please review.

Project coverage is 83.16%. Comparing base (b602d9a) to head (c5c8d26).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
..._logger/management/commands/prune_timeline_logs.py	80.95%	2 Missing and 2 partials ⚠️
timeline_logger/service.py	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
+ Coverage   83.13%   83.16%   +0.03%     
==========================================
  Files          11       13       +2     
  Lines         166      196      +30     
  Branches       13       16       +3     
==========================================
+ Hits          138      163      +25     
- Misses         25       27       +2     
- Partials        3        6       +3     

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