Finding 1: WALTailLSN semantic fix
- StatusSnapshot().WALTailLSN now reads super.WALCheckpointLSN (an LSN)
- Was: wal.Tail() which returns a physical byte offset
- Entries with LSN > WALTailLSN are guaranteed in the WAL
Finding 2: ScanWALEntries replay-source fix
- ScanWALEntries passes super.WALCheckpointLSN as the recycled boundary
- Was: flusher.CheckpointLSN() which in V1 equals CommittedLSN
- The flusher's live checkpoint may advance in memory, but entries above
the durable superblock checkpoint are still physically in the WAL
- Normal catch-up (replica at 70, committed at 100) now works because
fromLSN=71 > super.WALCheckpointLSN (which is the last persisted
checkpoint, not the live flusher state)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
pingqiuandClaude Opus 4.6
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