prevent excessive checking of puzzle page for pre-existing answers

[wimglenn]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 4 lines in your changes missing coverage. Please review.

Project coverage is 91.11%. Comparing base (eed1caf) to head (9af6616).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
aocd/models.py	80.00%	1 Missing and 1 partial ⚠️
aocd/runner.py	66.66%	0 Missing and 1 partial ⚠️
aocd/utils.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
- Coverage   91.17%   91.11%   -0.06%     
==========================================
  Files          25       25              
  Lines        2777     2781       +4     
  Branches      250      252       +2     
==========================================
+ Hits         2532     2534       +2     
- Misses        178      179       +1     
- Partials       67       68       +1     

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