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Add cooldown phase and wal_deleted_bytes metric for relocation debugg…#115

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zablotchi wants to merge 14 commits intomainfrom
add-cooldown-and-gc-metric
Draft

Add cooldown phase and wal_deleted_bytes metric for relocation debugg…#115
zablotchi wants to merge 14 commits intomainfrom
add-cooldown-and-gc-metric

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…ing.

This reverts commits:
- c8f8d1c fix to the fix
- c937f7b fix in relocation optimization
- 009e58a attempt: relocation speedup

The skip optimization caused the GC watermark to advance past entries
that hadn't been relocated, resulting in data loss when WAL files were
deleted. Multiple fix attempts failed to address the fundamental design
flaw in how skipped cells interact with GC watermark calculation.
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