Add database structure and endpoint for mag shift records

[d-j-hatton]

Endpoint is unprotected and is just a GET. Should add a mechanism for adding records later which will need to be behind auth. Database changes are purely additive

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.50%. Comparing base (e67c63a) to head (c490529).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #911      +/-   ##
==========================================
+ Coverage   55.47%   55.50%   +0.03%     
==========================================
  Files         103      103              
  Lines       11571    11588      +17     
  Branches     1545     1546       +1     
==========================================
+ Hits         6419     6432      +13     
- Misses       4803     4807       +4     
  Partials      349      349              

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