fix(db): Multi-DHTs support and stmt reuse bug

[cnlangzi]

Changes

• added Multi-DHTs support

Fixes

• fixed the stmt that is in using should not be closed by clean worker.

[codecov]

Codecov Report

Attention: Patch coverage is 98.73418% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 74.77%. Comparing base (2acb436) to head (dd1f9ee).

❗ Current head dd1f9ee differs from pull request most recent head f034a00. Consider uploading reports for the commit f034a00 to get more accurate results

Files	Patch %	Lines
tx.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   73.67%   74.77%   +1.10%     
==========================================
  Files          40       40              
  Lines        1637     1665      +28     
==========================================
+ Hits         1206     1245      +39     
+ Misses        317      309       -8     
+ Partials      114      111       -3     

Flag	Coverage Δ
Unit-Tests	74.77% <98.73%> (+1.10%)	⬆️

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[sourcery-ai]

Hey @cnlangzi - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟡 Testing: 3 issues found
• 🟢 Complexity: all looks good
• 🟢 Docstrings: all looks good

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[deepsource-io]

Here's the code health analysis summary for commits 2acb436..f034a00. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Go	✅ Success		View Check ↗

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