remove old PV database

[peterdudfield]

Pull Request

Description

remove old PV database
openclimatefix/ocf-infrastructure#377

How Has This Been Tested?

CI 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (08f0096) 95.53% compared to head (b0a6bad) 95.69%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
+ Coverage   95.53%   95.69%   +0.16%     
==========================================
  Files          20       20              
  Lines        1142     1138       -4     
==========================================
- Hits         1091     1089       -2     
+ Misses         51       49       -2     

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