refactor for chunk compaction

[davies]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.59809% with 51 lines in your changes are missing coverage. Please review.

Project coverage is 55.43%. Comparing base (b46fac4) to head (20ff35b).
Report is 14 commits behind head on main.

Files	Patch %	Lines
pkg/meta/base.go	83.46%	14 Missing and 7 partials ⚠️
pkg/meta/sql.go	59.45%	10 Missing and 5 partials ⚠️
pkg/meta/redis.go	57.69%	6 Missing and 5 partials ⚠️
pkg/meta/tkv.go	78.94%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4585      +/-   ##
==========================================
- Coverage   55.54%   55.43%   -0.11%     
==========================================
  Files         159      159              
  Lines       42940    42773     -167     
==========================================
- Hits        23849    23713     -136     
+ Misses      16431    16416      -15     
+ Partials     2660     2644      -16     

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