Integrate parquet ledger store

[jewei1997]

Describe your changes and provide context

Testing performed to validate your change

[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	Jan 6, 2026, 3:11 PM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 78 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.74%. Comparing base (11d68f4) to head (65a52b3).

Files with missing lines	Patch %	Lines
sei-db/db_engine/parquet/kv/db.go	0.00%	40 Missing ⚠️
sei-db/db_engine/parquet/kv/batch.go	0.00%	38 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2665      +/-   ##
==========================================
- Coverage   43.76%   43.74%   -0.03%     
==========================================
  Files        1906     1908       +2     
  Lines      159033   159111      +78     
==========================================
- Hits        69603    69597       -6     
- Misses      83023    83111      +88     
+ Partials     6407     6403       -4     

Flag	Coverage Δ
sei-chain	45.71% <0.00%> (-0.05%)	⬇️
sei-cosmos	38.20% <ø> (-0.02%)	⬇️
sei-db	69.13% <ø> (ø)
sei-tendermint	47.33% <ø> (ø)

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

Files with missing lines	Coverage Δ
sei-db/db_engine/parquet/kv/batch.go	0.00% <0.00%> (ø)
sei-db/db_engine/parquet/kv/db.go	0.00% <0.00%> (ø)

... and 18 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.