apiVersion: postgresql.cnpg.io/v1
kind: Cluster
metadata:
  name: postgresql
  namespace: postgresql
spec:
  # PostgreSQL version
  imageName: ghcr.io/cloudnative-pg/postgresql:16.6

  # Number of instances
  instances: 3  # 1 primary + 2 replicas for HA

  # Storage configuration - using local-path-retain for data protection
  storage:
    storageClass: local-path-retain
    size: 10Gi

  # Resource requests and limits
  resources:
    requests:
      memory: "256Mi"
      cpu: "30m"
    limits:
      memory: "384Mi"

  # PostgreSQL configuration
  postgresql:
    parameters:
      max_connections: "200"
      shared_buffers: "128MB"
      effective_cache_size: "384MB"
      maintenance_work_mem: "128MB"
      checkpoint_completion_target: "0.9"
      wal_buffers: "16MB"
      default_statistics_target: "100"
      random_page_cost: "1.1"
      effective_io_concurrency: "200"
      work_mem: "2621kB"
      min_wal_size: "1GB"
      max_wal_size: "4GB"

  # Bootstrap configuration
  bootstrap:
    initdb:
      database: app
      owner: app
      secret:
        name: postgresql-app-user

  # Monitoring
  monitoring:
    enablePodMonitor: true
    customQueriesConfigMap:
      - name: cnpg-default-monitoring
        key: queries
    # Add pod labels to metrics for Grafana dashboard compatibility
    podMonitorRelabelings:
      # Add cluster label from pod label
      - sourceLabels: [__meta_kubernetes_pod_label_cnpg_io_cluster]
        targetLabel: cluster
      # Add instance role label
      - sourceLabels: [__meta_kubernetes_pod_label_cnpg_io_instanceRole]
        targetLabel: role

  # Backup disabled - using Velero for backups instead

  # Affinity to spread replicas across nodes (soft - prefer different nodes)
  affinity:
    podAntiAffinityType: preferred
    tolerations:
      - key: "node-role.kubernetes.io/master"
        operator: "Exists"
        effect: "NoExecute"

  # Enable superuser access
  enableSuperuserAccess: true
  superuserSecret:
    name: postgresql-superuser

  # Note: databases created manually (CNPG managed databases not supported in this version)
  # - authelia