Record stats inside indexing batch loop

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 54.66%. Comparing base (a88111a) to head (491961a).

Files	Patch %	Lines
indexers/contacts.go	44.44%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
- Coverage   54.77%   54.66%   -0.11%     
==========================================
  Files           6        6              
  Lines         440      439       -1     
==========================================
- Hits          241      240       -1     
  Misses        174      174              
  Partials       25       25              

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