Add purge

[srmnitc]

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[codecov]

Codecov Report

Attention: Patch coverage is 92.10526% with 3 lines in your changes missing coverage. Please review.

Project coverage is 62.41%. Comparing base (3ee4941) to head (b39b4dd).

Files	Patch %	Lines
atomrdf/graph.py	90.90%	2 Missing ⚠️
atomrdf/stores.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   62.07%   62.41%   +0.33%     
==========================================
  Files          22       22              
  Lines        3212     3249      +37     
==========================================
+ Hits         1994     2028      +34     
- Misses       1218     1221       +3     

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