Viktor Barzin c3553731c7 dbaas: CNPG write-reduction — archive_timeout=0, commit_delay, wal_compression=zstd ... Part of code-oflt (cut sdc write IOPS before the SSD move; analysis #6922). - archive_timeout 300->0: CNPG forces archive_mode=on but .spec.backup is empty (no ObjectStore), so a 16MB WAL segment switch every 5min shipped NOWHERE = ~4.6 GB/day of pure-waste WAL on the contended sdc. archive_mode stays CNPG-on (reserved); 0 just stops the timed switch. Daily pg_dump cron unchanged. - commit_delay 0->2500us: group-commit coalesces concurrent fsyncs. SAFE for every DB incl financial -- data still fsynced before COMMIT acks, only <=2.5ms added latency under concurrency. - wal_compression pglz->zstd: ~30-50% smaller full-page images. All sighup-reloadable. Applied via targeted apply of module.dbaas.null_resource.pg_cluster (trigger bumped) to avoid the pre-existing mysql VCT drift that breaks broad dbaas applies. Refs: code-oflt. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>		2026-06-29 15:16:38 +00:00
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dbaas	dbaas: CNPG write-reduction — archive_timeout=0, commit_delay, wal_compression=zstd	2026-06-29 15:16:38 +00:00