Frank Song 13dbd818c9 fix: prune stale session index entries after session-id rotation — v0.50.148 (PR #847 by @franksong2702) ...

Prune ghost _index.json rows whose backing session file no longer exists, on both incremental index writes and all_sessions() reads. Fixes duplicate session entries after session-id rotation (e.g. context compression). Also pre-snapshots in_memory_ids under a single LOCK acquisition in all_sessions() rather than one per row.

Closes #846.

Review additions: optimised lock pattern in all_sessions() (one LOCK acquisition instead of N). Tests: 1856 passing.

2026-04-22 16:26:38 +00:00

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