chore(refactor): drop unused code

[arajasek]

Describe your changes and provide context

Old methods aren't used any longer.

Testing performed to validate your change

Test pass

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 6, 2026, 12:11 AM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.65%. Comparing base (5c26262) to head (095d400).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2811      +/-   ##
==========================================
+ Coverage   56.58%   56.65%   +0.06%     
==========================================
  Files        2033     2033              
  Lines      166263   166129     -134     
==========================================
+ Hits        94074    94114      +40     
+ Misses      63926    63736     -190     
- Partials     8263     8279      +16     

Flag	Coverage Δ
sei-chain	41.54% <ø> (+0.03%)	⬆️
sei-cosmos	48.12% <ø> (-0.01%)	⬇️
sei-db	68.72% <ø> (ø)
sei-tendermint	58.01% <ø> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
app/app.go	73.17% <ø> (+7.03%)	⬆️

... and 22 files with indirect coverage changes

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