chore: improvements on sentinel and model saving

[s0nicboOm]

1. Sentinel improvements
2. Model saving (fix for version number)

[codecov[bot]]

Codecov Report

Merging #229 (4a135e2) into generic-anomaly-detection (376bb6c) will decrease coverage by 0.16%. The diff coverage is n/a.

:exclamation: Current head 4a135e2 differs from pull request most recent head 801ef1d. Consider uploading reports for the commit 801ef1d to get more accurate results

@@                      Coverage Diff                      @@
##           generic-anomaly-detection     #229      +/-   ##
=============================================================
- Coverage                      96.48%   96.33%   -0.16%     
=============================================================
  Files                             46       46              
  Lines                           1962     1962              
  Branches                         157      157              
=============================================================
- Hits                            1893     1890       -3     
- Misses                            50       52       +2     
- Partials                          19       20       +1     

see 1 file with indirect coverage changes

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