feat(infra): DB perf snapshot+diff collector (dbperfSnapshots)

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• wi-cli-whey created · 2026-06-16
• wi-cli-whey commented · 2026-06-16
  Daily systemd timer (evolutiva-dbperf@venus, nw-venus lane) snapshots pg_stat_statements + dead-tuple + cache-hit into the dbperfSnapshots table (migration applied 2026-06-16), diffs vs previous snapshot, DMs PM digest. Table + pg_cron prune job already live. Remaining: nw-venus installs timer + wires applog_reader creds. SQL query set defined by db-venus-cc.