Record slot sources

[dpi]

So they may be reflected by consumers.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.24%. Comparing base (65f6adf) to head (20f1bbb).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #58      +/-   ##
============================================
+ Coverage     97.01%   97.24%   +0.23%     
- Complexity      208      221      +13     
============================================
  Files            31       34       +3     
  Lines           469      509      +40     
============================================
+ Hits            455      495      +40     
  Misses           14       14              

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