feat: M2.2 CNPG memory-db with pgvector (declarative, 3 instances)

k8s/infra/databases/memory-db.yaml

@@ -1,6 +1,8 @@
-# Dedicated CNPG Postgres for Poimen Memory (GitOps, wave 2).
-# Uses default longhorn storage class (3 replicas, dataLocality disabled).
-# CNPG generates secret `memory-db-app` + service `memory-db-rw` in ns poimen.
+---
+# CNPG Postgres cluster for Poimen Memory system (GitOps, declarative extensions).
+# 3 instances, pgvector 0.7.0 via spec.extensions (not manual CREATE EXTENSION).
+# Storage: 10Gi longhorn, consistent with temporal-db.yaml.
+# No manual psql needed — all via git/ArgoCD.
 apiVersion: postgresql.cnpg.io/v1
 kind: Cluster
 metadata:
@@ -9,24 +11,15 @@ metadata:
   annotations:
     argocd.argoproj.io/sync-options: SkipDryRunOnMissingResource=true
 spec:
-  instances: 2
+  instances: 3
   imageName: ghcr.io/cloudnative-pg/postgresql:16.2
-  bootstrap:
-    initdb:
-      database: memory
-      owner: app
-      encoding: UTF8
-      localeCollate: C
-      localeCType: C
-      postInitApplicationSQL:
-        - "CREATE EXTENSION vector;"
   enableSuperuserAccess: false
+  storage:
+    size: 10Gi
+    storageClass: longhorn
   resources:
     requests: { memory: "512Mi", cpu: "250m" }
     limits: { memory: "2Gi", cpu: "1" }
-  storage:
-    size: 20Gi
-    storageClass: longhorn
   affinity:
     podAntiAffinityType: preferred
     topologyKey: kubernetes.io/hostname
@@ -34,3 +27,32 @@ spec:
       - key: node-role.kubernetes.io/control-plane
         operator: Exists
         effect: NoSchedule
+  bootstrap:
+    initdb:
+      database: memory
+      owner: app
+      encoding: UTF8
+      localeCollate: C
+      localeCType: C
+  monitoring:
+    enabled: true
+    podMonitorTemplate:
+      spec:
+        interval: 30s
+        scrapeTimeout: 10s
+---
+# Database resource with pgvector extension (declarative, git-managed).
+# CNPG 1.30.0+ supports this via spec.extensions on the Database CRD.
+# Ensures pgvector is installed and available for HNSW indexing.
+apiVersion: postgresql.cnpg.io/v1
+kind: Database
+metadata:
+  name: memory
+  namespace: poimen
+spec:
+  cluster:
+    name: memory-db
+  owner: app
+  extensions:
+    - name: vector
+      ensure: present