Fix insertion errors for txn and block

[mattiekat]

Description

This resolves the insertion conflict that is being caused by #2246 that introduced multiple concurrent tasks to scrape. This does not address the underlying concurrency issue I discovered, however. Please review the issue comments for more details.

Drive-by changes

• Cleans up logs a bit (This was useful during testing and I think is useful globally)
• Removed an unused file

Related issues

Fixes hyperlane-xyz/issues#493
Relates to #2631

Backward compatibility

Yes

Testing

Manual

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c53c1f7) 65.39% compared to head (449639e) 65.39%.
Report is 1 commits behind head on main.

❗ Current head 449639e differs from pull request most recent head 88326c2. Consider uploading reports for the commit 88326c2 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2629   +/-   ##
=======================================
  Coverage   65.39%   65.39%           
=======================================
  Files          89       89           
  Lines        1358     1358           
  Branches      182      182           
=======================================
  Hits          888      888           
  Misses        463      463           
  Partials        7        7           

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