fix: add .compaction-queue to handle in-mid compaction crash

[dkharms]

Description

Compaction's substitute-and-delete of stale fractions isn't atomic, so a crash mid-compaction could leave source fractions behind and produce duplicates on restart.

This adds a .compaction-queue file recording the participating fractions, which is written before merging and used on startup to clean up any leftover sources from an interrupted compaction.

---

• I have read and followed all requirements in CONTRIBUTING.md;
• I used LLM/AI assistance to make this pull request;

If you have used LLM/AI assistance please provide model name and full prompt:

Model: {{model-name}}
Prompt: {{prompt}}

[dkharms]

@seqbenchbot up main bulk

[seqbenchbot]

Nice, @dkharms <(-^,^-)=b!

Your request was successfully served.
Identificator for your ongoing benchmark - 8eedacf8.

Here is a list of helpful links:

• Take a look at Grafana dashboard;
• Live-tailing logs are also available;

Have a great time!

[dkharms]

@seqbenchbot down 8eedacf8

[seqbenchbot]

Nice, @dkharms <(-^,^-)=b!

The benchmark with identificator 8eedacf8 was finished.
I've prepared a summary for you. Click on Show summary button to see it:

Show summary

Query	Type	mean (ms)			stddev (ms)			p(50) (ms)			p(95) (ms)			p(99) (ms)			iterations
		base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff
bulk	warm	68.14	66.54	-2.34%	39.10	28.75	-26.46%	55.00	59.00	+7.27%	163.00	119.00	-26.99%	223.00	194.00	-13.00%	92689.00	92790.00	+0.11%

Have a great time!

[dkharms]

@seqbenchbot up main bulk

[seqbenchbot]

Nice, @dkharms <(-^,^-)=b!

Your request was successfully served.
Identificator for your ongoing benchmark - 1c283919.

Here is a list of helpful links:

• Take a look at Grafana dashboard;
• Live-tailing logs are also available;

Have a great time!

[dkharms]

@seqbenchbot down 1c283919

[seqbenchbot]

Nice, @dkharms <(-^,^-)=b!

The benchmark with identificator 1c283919 was finished.
I've prepared a summary for you. Click on Show summary button to see it:

Show summary

Query	Type	mean (ms)			stddev (ms)			p(50) (ms)			p(95) (ms)			p(99) (ms)			iterations
		base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff
bulk	warm	89.78	83.67	-6.80%	58.54	42.06	-28.15%	67.00	70.00	+4.48%	225.00	167.00	-25.78%	298.00	252.00	-15.44%	1540251.00	1540362.00	+0.01%

Have a great time!

[dkharms]

@seqbenchbot up main bulk

[seqbenchbot]

Nice, @dkharms <(-^,^-)=b!

Your request was successfully served.
Identificator for your ongoing benchmark - 36d0de9f.

Here is a list of helpful links:

• Take a look at Grafana dashboard;
• Live-tailing logs are also available;

Have a great time!

[dkharms]

@seqbenchbot down 36d0de9f

[seqbenchbot]

Nice, @dkharms <(-^,^-)=b!

The benchmark with identificator 36d0de9f was finished.
I've prepared a summary for you. Click on Show summary button to see it:

Show summary

Query	Type	mean (ms)			stddev (ms)			p(50) (ms)			p(95) (ms)			p(99) (ms)			iterations
		base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff
bulk	warm	67.39	62.57	-7.16%	43.57	29.77	-31.69%	51.00	53.00	+3.92%	173.00	118.00	-31.79%	234.00	193.00	-17.52%	716648.00	716757.00	+0.02%

Have a great time!

[dkharms]

@seqbenchbot up main mixed

[seqbenchbot]

Nice, @dkharms <(-^,^-)=b!

Your request was successfully served.
Identificator for your ongoing benchmark - 29d571ac.

Here is a list of helpful links:

• Take a look at Grafana dashboard;
• Live-tailing logs are also available;

Have a great time!

[dkharms]

@seqbenchbot down 29d571ac

[seqbenchbot]

Nice, @dkharms <(-^,^-)=b!

The benchmark with identificator 29d571ac was finished.
I've prepared a summary for you. Click on Show summary button to see it:

Show summary

Query	Type	mean (ms)			stddev (ms)			p(50) (ms)			p(95) (ms)			p(99) (ms)			iterations
		base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff	base	comp	diff
bulk	warm	48.99	50.87	+3.84%	11.90	13.74	+15.47%	47.00	48.00	+2.13%	70.00	76.00	+8.57%	93.00	102.00	+9.68%	45658.00	45585.00	-0.16%
service:payment-backend-eu AND k8s_namespace:prod AND level:[0 to 3] AND ( message:'failed' OR message:'timeout' )	warm	53.72	58.03	+8.02%	20.62	24.77	+20.15%	45.00	48.00	+6.67%	97.00	113.00	+16.49%	117.00	139.50	+19.23%	9615.00	9596.00	-0.20%

Have a great time!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 62.29508% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.48%. Comparing base (25381c2) to head (46ab336).

Files with missing lines	Patch %	Lines
fracmanager/frac_manifest.go	48.71%	18 Missing and 2 partials ⚠️
compaction/merge.go	87.50%	1 Missing and 1 partial ⚠️
compaction/planner.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #453      +/-   ##
==========================================
- Coverage   70.51%   70.48%   -0.04%     
==========================================
  Files         232      232              
  Lines       18268    18327      +59     
==========================================
+ Hits        12881    12917      +36     
- Misses       4426     4446      +20     
- Partials      961      964       +3     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 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.