Batch and throttle tantivy commits to stop churning DB#187
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Tune the Tantivy commit cadence for power rather than latency: - COMMIT_TIME 5s -> 60s: during idle/backfill we now flush accumulated events into searchable segments roughly once a minute instead of every few seconds, so the CPU can race to idle between bursts (far fewer fsyncs and segment merges). Search freshness is unaffected because the search path force-commits first. - COMMIT_RATE 500 -> 20000: at network-paced backfill (/messages is the bottleneck) the old count cap fired every few seconds and produced ~15 small segments per minute, each carrying its own AES + HMAC-SHA256 finalization, file opens and eventual merge. Letting ~a minute's worth of events coalesce into one segment cuts that per-segment overhead by ~10x. The value sits within the writer heap, which self-flushes if it fills first, so it can't overrun memory. Durability is unchanged: events and checkpoints still commit to SQLite per batch and are replayed from the uncommitted_events table on restart. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01JP4yoxKeGLRDLkCPTu3DFq
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Fixes bits of element-hq/element-web#32119