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  perf(db): lower default Postgres shared_buffers 128MB->64MB across all platforms

  LastSkywalker released this 2026-06-14 16:26:10 +03:00 | 194 commits to main since this release

  shared_buffers is the dominant resident-RAM lever for the managed db: it's
  a static reservation that faults into RAM as pages are touched, and for
  this app's tiny working set (a few MB of recent metrics/history) 128MB is
  oversized — it roughly doubles the steady-state db RSS for no gain.

  Drop the default to 64MB in BOTH places that define a managed db service:
  the controller generator (compose_writer.go) and the dokploy template. Both
  remain env-overridable (NODE_STATS_PG_SHARED_BUFFERS) so a large multi-host
  hub can raise them without a code change. On upgrade the controller
  regenerates compose with the new default (for nodes that never set the env
  var); new dokploy copies get 64MB out of the box. Halves the db's
  steady-state footprint (~180MB -> ~90-110MB observed) on small VPSes.

  NOTE: this is a config default, not a periodic op — a container restart's
  brief low reading is cold cache that re-warms; nothing to cron.

  Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

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