## Context
Disk write analysis showed MySQL InnoDB Cluster writing ~95 GB/day for only
~35 MB of actual data due to Group Replication overhead (binlog, relay log,
GR apply log). The operator enforces GR even with serverInstances=1.
Bitnami Helm charts were deprecated by Broadcom in Aug 2025 — no free
container images available. Using official mysql:8.4 image instead.
## This change:
- Replace helm_release.mysql_cluster service selector with raw
kubernetes_stateful_set_v1 using official mysql:8.4 image
- ConfigMap mysql-standalone-cnf: skip-log-bin, innodb_flush_log_at_trx_commit=2,
innodb_doublewrite=ON (re-enabled for standalone safety)
- Service selector switched to standalone pod labels
- Technitium: disable SQLite query logging (18 GB/day write amplification),
keep PostgreSQL-only logging (90-day retention)
- Grafana datasource and dashboards migrated from MySQL to PostgreSQL
- Dashboard SQL queries fixed for PG integer division (::float cast)
- Updated CLAUDE.md service-specific notes
## What is NOT in this change:
- InnoDB Cluster + operator removal (Phase 4, 7+ days from now)
- Stale Vault role cleanup (Phase 4)
- Old PVC deletion (Phase 4)
Expected write reduction: ~113 GB/day (MySQL 95 + Technitium 18)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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