*: delete slow stats after store tombstone

[rleungx]

What problem does this PR solve?

Issue Number: Close #7180.

What is changed and how does it work?

Check List

Tests

• Manual test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• bufferflies
• lhy1024

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[rleungx]

/cc @LykxSassinator

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[codecov]

Codecov Report

Merging #7181 (cf85819) into master (2266c94) will increase coverage by 0.07%.
The diff coverage is 100.00%.

❗ Current head cf85819 differs from pull request most recent head f6b9caa. Consider uploading reports for the commit f6b9caa to get more accurate results

@@            Coverage Diff             @@
##           master    #7181      +/-   ##
==========================================
+ Coverage   74.56%   74.63%   +0.07%     
==========================================
  Files         442      441       -1     
  Lines       47436    47392      -44     
==========================================
+ Hits        35371    35372       +1     
+ Misses       8970     8932      -38     
+ Partials     3095     3088       -7     

Flag	Coverage Δ
unittests	74.63% <100.00%> (+0.07%)	⬆️

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[rleungx]

/merge

[ti-chi-bot]

@rleungx: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: cf85819

[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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