remove old database: major change

[peterdudfield]

Pull Request

Description

Only save (and read) data to new database

• removed nowcasting_datamodel so only using pvsite-datamodel
• only saves to one database

How Has This Been Tested?

• [x] CI tests
• [x] run locally pvoutput.org
• [x] run locally SS

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
• [x] 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

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (356247b) 96.67% compared to head (f96add7) 97.50%.

Files	Patch %	Lines
pvconsumer/save.py	83.33%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #73 +/- ## ========================================== + Coverage 96.67% 97.50% +0.83% ========================================== Files 6 6 Lines 301 281 -20 ========================================== - Hits 291 274 -17 + Misses 10 7 -3 ```

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