add update function

[peterdudfield]

Pull Request

Description

Create Forecast that has all the latest forecast values in it. This means we can load this forecast and get all the value in the past.

• add forecast value latest table
• add function to run update
• adjust read function option of historic
• Add method to for from ForecastSQL with latest values to Forecast
• add migrations

Fixes #2

How Has This Been Tested?

• add test for update
• add test for read function
• add test to change ForecastSQL with latest values to Forecast
• [x] Yes

Checklist:

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

[codecov-commenter]

Codecov Report

Merging #54 (f67f4c8) into main (37dd7f9) will increase coverage by 0.04%. The diff coverage is 98.85%.

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
+ Coverage   98.44%   98.49%   +0.04%     
==========================================
  Files          16       17       +1     
  Lines         645      730      +85     
==========================================
+ Hits          635      719      +84     
- Misses         10       11       +1     

Impacted Files	Coverage Δ
nowcasting_datamodel/models/gsp.py	93.65% <ø> (ø)
nowcasting_datamodel/national.py	92.10% <ø> (ø)
nowcasting_datamodel/update.py	97.43% <97.43%> (ø)
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/models/models.py	100.00% <100.00%> (ø)
nowcasting_datamodel/read/read.py	99.31% <100.00%> (+0.03%)	:arrow_up:
nowcasting_datamodel/save.py	100.00% <100.00%> (ø)

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