dbaas: stretch CNPG checkpoint timer 5->15min + raise WAL size (cut sdc write IOPS)

Viktor asked to reduce CNPG checkpoint/WAL writes as part of the sdc
IOPS-isolation work (code-oflt). The IOPS deep-dive found CNPG checkpoints
fire 100% on the 5-min timer (checkpoints_timed >> checkpoints_req), each
triggering a full-page-write burst + flush onto the contended 7200rpm sdc
spindle -- a top write-IOPS source after etcd.

Set checkpoint_timeout=15min + max_wal_size=4GB + min_wal_size=1GB so
checkpoints fire ~1/3 as often (fewer FPW) and WAL segments are recycled
rather than churned. All three are sighup-reloadable -> CNPG applies them
without a restart or failover. checkpoint_completion_target stays 0.9 so
each checkpoint's IO is still smeared across the interval. Bounded
recovery-time tradeoff (more WAL to replay on crash), acceptable for the
write relief. wal_compression left at pglz ('on') pending image
zstd-support verification.

Also refreshes the stale CNPG tuning note in .claude/CLAUDE.md (it listed
shared_buffers=512MB / effective_cache_size=1536MB / 2Gi; live is 1024MB /
2560MB / 3Gi).

Refs: code-oflt (etcd/sdc IO isolation).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.claude/CLAUDE.md

@@ -197,7 +197,7 @@ the workflow's built-in `GITHUB_TOKEN` (`packages: write`).
 
 **`postgresql_host`** in `config.tfvars` is `pg-cluster-rw.dbaas.svc.cluster.local` (the CNPG primary). The legacy `postgresql.dbaas` service is a live compatibility alias (selector `cnpg.io/instanceRole=primary`, so it also reaches the primary — authentik's PgBouncer still points at it) — but use `pg-cluster-rw` for anything new. This variable is shared by ~12 stacks.
 
-**CNPG tuning** (in `stacks/dbaas/modules/dbaas/main.tf`): `shared_buffers=512MB`, `work_mem=16MB`, `wal_compression=on`, `effective_cache_size=1536MB`, pod memory 2Gi.
+**CNPG tuning** (in `stacks/dbaas/modules/dbaas/main.tf`): `shared_buffers=1024MB`, `effective_cache_size=2560MB`, `work_mem=16MB`, `max_connections=200`, `wal_compression=on`, pod memory 3Gi. **Write-reduction (2026-06-29, code-oflt):** `checkpoint_timeout=15min` + `max_wal_size=4GB` + `min_wal_size=1GB` — checkpoints were 100% timer-driven at the 5-min default, bursting full-page-writes onto the contended sdc HDD; all three are reloadable (no restart).
 
 ## Networking & Resilience
 - **Critical path services scaled to 3**: Traefik, Authentik, CrowdSec LAPI, PgBouncer, Cloudflared.

stacks/dbaas/modules/dbaas/main.tf

@@ -829,7 +829,7 @@ resource "kubernetes_deployment" "phpmyadmin" {
       metadata[0].annotations["keel.sh/trigger"],
       metadata[0].annotations["keel.sh/pollSchedule"], # KYVERNO_LIFECYCLE_V2
       metadata[0].annotations["keel.sh/match-tag"],
-      spec[0].template[0].spec[0].container[0].image, # KEEL_IGNORE_IMAGE — Keel manages tag updates
+      spec[0].template[0].spec[0].container[0].image,                     # KEEL_IGNORE_IMAGE — Keel manages tag updates
       spec[0].template[0].metadata[0].annotations["keel.sh/update-time"], # KEEL_LIFECYCLE_V1
     ]
   }
@@ -1159,6 +1159,16 @@ resource "null_resource" "pg_cluster" {
             wal_compression: "on"
             random_page_cost: "4"
             checkpoint_completion_target: "0.9"
+            # Write-reduction (2026-06-29, code-oflt): checkpoints were 100%
+            # timer-driven at the 5-min PG default, each firing a full-page-write
+            # burst + flush onto the contended sdc HDD. Stretch the timer to 15min
+            # and raise max/min_wal_size so size-triggered checkpoints stay rare and
+            # WAL segments get recycled (not churned). All three are reloadable
+            # (sighup) -> CNPG applies them without a restart. Bounded recovery-time
+            # tradeoff; completion_target 0.9 still smears each checkpoint's IO.
+            checkpoint_timeout: "15min"
+            max_wal_size: "4GB"
+            min_wal_size: "1GB"
           enableAlterSystem: true
         enableSuperuserAccess: true
         inheritedMetadata:
@@ -1605,7 +1615,7 @@ resource "kubernetes_deployment" "pgadmin" {
       metadata[0].annotations["keel.sh/trigger"],
       metadata[0].annotations["keel.sh/pollSchedule"], # KYVERNO_LIFECYCLE_V2
       metadata[0].annotations["keel.sh/match-tag"],
-      spec[0].template[0].spec[0].container[0].image, # KEEL_IGNORE_IMAGE — Keel manages tag updates
+      spec[0].template[0].spec[0].container[0].image,                     # KEEL_IGNORE_IMAGE — Keel manages tag updates
       spec[0].template[0].metadata[0].annotations["keel.sh/update-time"], # KEEL_LIFECYCLE_V1
     ]
   }