Issue/fix migration

[peterdudfield]

Pull Request

Description

Fix for when upgrading the model, id gets pushed

How Has This Been Tested?

Ci test + new test

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #175 (6c34357) into main (7cb7d2c) will increase coverage by 0.00%. The diff coverage is 100.00%.

:exclamation: Current head 6c34357 differs from pull request most recent head 04531db. Consider uploading reports for the commit 04531db to get more accurate results

@@           Coverage Diff           @@
##             main     #175   +/-   ##
=======================================
  Coverage   94.97%   94.97%           
=======================================
  Files          25       25           
  Lines        1532     1533    +1     
=======================================
+ Hits         1455     1456    +1     
  Misses         77       77           

Impacted Files	Coverage Δ
nowcasting_datamodel/save/update.py	99.01% <100.00%> (+<0.01%)	:arrow_up:

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