Issue/latest model

[peterdudfield]

Pull Request

Description

• add model id as unique constraint in forecst value latest table
• add migration

Fixes #159

How Has This Been Tested?

CI tests, + added a few more

• [ ] 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 #161 (39aaf5a) into main (c83e47a) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
+ Coverage   94.89%   94.90%   +0.01%     
==========================================
  Files          22       22              
  Lines        1313     1316       +3     
==========================================
+ Hits         1246     1249       +3     
  Misses         67       67              

Impacted Files	Coverage Δ
nowcasting_datamodel/models/forecast.py	84.18% <100.00%> (+0.08%)	:arrow_up:
nowcasting_datamodel/save/update.py	99.00% <100.00%> (+0.02%)	:arrow_up:

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