Update existing links in has database

[jedie]

To make deleting old backups safe.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.19%. Comparing base (79014fd) to head (15e6ee9).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
PyHardLinkBackup/cli_app/__init__.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
- Coverage   78.35%   78.19%   -0.16%     
==========================================
  Files          27       27              
  Lines        1201     1197       -4     
  Branches      105      104       -1     
==========================================
- Hits          941      936       -5     
- Misses        260      261       +1     

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