Issue/blend forecasts

[peterdudfield]

Pull Request

Description

• fix update to save to specific model
• update blend to also load previous days

Fixes #

How Has This Been Tested?

Ci tests

• [ ] Yes

If your changes affect data processing, have you plotted any changes? i.e. have you done a quick sanity check?

• [ ] 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 #163 (07ec936) into main (02502ea) will decrease coverage by 0.06%. The diff coverage is 92.41%.

@@            Coverage Diff             @@
##             main     #163      +/-   ##
==========================================
- Coverage   94.90%   94.84%   -0.06%     
==========================================
  Files          22       23       +1     
  Lines        1316     1456     +140     
==========================================
+ Hits         1249     1381     +132     
- Misses         67       75       +8     

Impacted Files	Coverage Δ
nowcasting_datamodel/read/blend.py	91.66% <91.66%> (ø)
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/read/read.py	98.34% <100.00%> (+1.32%)	:arrow_up:
nowcasting_datamodel/save/update.py	99.00% <100.00%> (+<0.01%)	:arrow_up:

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