compact: use size better

[ThomasWaldmann]

Fixes #9856.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.09%. Comparing base (88e186e) to head (230f6ef).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9863      +/-   ##
==========================================
- Coverage   85.10%   85.09%   -0.02%     
==========================================
  Files          93       93              
  Lines       15444    15450       +6     
  Branches     2335     2335              
==========================================
+ Hits        13144    13147       +3     
- Misses       1603     1604       +1     
- Partials      697      699       +2     

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[ThomasWaldmann]

WITH --stats

Starting compaction / garbage collection...
Getting object IDs from the cached chunks index...
Computing object IDs used by archives...
Analyzing archive ::archive1 2026-07-05 20:29:59.761294+02:00 ab04f194bc06b80a730c0dad2cd1d9db45381ce435164bbc1288f0eadad6930a (1/1)
Cleaning archives directory from soft-deleted archives...
Deleting 0 unused objects...
Overall statistics, considering all 1 archives in this repository:
Source data size was 10 MB in 3 files.
Deduplicated size is 10 MB.
Deduplication factor is 1.00.
Repository size is 5 MB in 8 objects.
Compression factor is 0.50.
Compaction saved 0 B.
Cleaning up files cache...
Removed 0 unused files cache files.
Finished compaction / garbage collection...

WITHOUT --stats

Starting compaction / garbage collection...
Getting object IDs from the cached chunks index...
Computing object IDs used by archives...
Analyzing archive ::archive1 2026-07-05 20:30:01.743591+02:00 dcd8a5bc80e3a227a5601ecb8457740caacfb774b342fb98e32d153b3175e921 (1/1)
Cleaning archives directory from soft-deleted archives...
Deleting 0 unused objects...
Cleaning up files cache...
Removed 0 unused files cache files.
Finished compaction / garbage collection...