Issue/dont save national

[peterdudfield]

Pull Request

Description

add option to only update national, or gsps in update forecast

helps with https://github.com/openclimatefix/nowcasting_forecast/issues/152

How Has This Been Tested?

added tests

• [ ] 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-commenter]

Codecov Report

Merging #92 (bcea49d) into main (66fbbae) will increase coverage by 0.02%. The diff coverage is 100.00%.

:exclamation: Current head bcea49d differs from pull request most recent head b007c8a. Consider uploading reports for the commit b007c8a to get more accurate results

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
+ Coverage   98.53%   98.56%   +0.02%     
==========================================
  Files          17       17              
  Lines         820      836      +16     
==========================================
+ Hits          808      824      +16     
  Misses         12       12              

Impacted Files	Coverage Δ
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/update.py	98.63% <100.00%> (+0.38%)	:arrow_up:

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