Add unique constraint for players to delete

[tudddorrr]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.39%. Comparing base (79d4ee7) to head (3758cc1).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1040   +/-   ##
========================================
  Coverage    98.39%   98.39%           
========================================
  Files          466      467    +1     
  Lines         7461     7462    +1     
  Branches       984      984           
========================================
+ Hits          7341     7342    +1     
  Misses          49       49           
  Partials        71       71           

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