apiVersion: postgresql.cnpg.io/v1
kind: Cluster
metadata:
  name: pg-gitlab
  namespace: gitlab
spec:
  imageName: ghcr.io/cloudnative-pg/postgresql:16
  instances: 3  # 3 instances for production HA

  # Database resources (homelab-friendly requests, burstable CPU)
  resources:
    requests:
      memory: "1Gi"
      cpu: "50m"
    limits:
      memory: "4Gi"
      cpu: "500m"

  # Spread replicas across different nodes
  affinity:
    topologyKey: kubernetes.io/hostname

  storage:
    size: 50Gi  # Increased for production
    storageClass: rook-ceph-block

  primaryUpdateStrategy: unsupervised

  bootstrap:
    initdb:
      database: gitlabhq_production
      owner: app
      postInitSQL:
        - CREATE EXTENSION IF NOT EXISTS pg_trgm;
        - CREATE EXTENSION IF NOT EXISTS btree_gist;

  # PostgreSQL configuration tuning for GitLab
  postgresql:
    parameters:
      max_connections: "400"
      shared_buffers: "1GB"
      effective_cache_size: "3GB"
      maintenance_work_mem: "256MB"
      checkpoint_completion_target: "0.9"
      wal_buffers: "16MB"
      default_statistics_target: "100"
      random_page_cost: "1.1"
      effective_io_concurrency: "200"
      work_mem: "16MB"
      min_wal_size: "1GB"
      max_wal_size: "4GB"
      max_worker_processes: "4"
      max_parallel_workers_per_gather: "2"
      max_parallel_workers: "4"

  # Backup configuration to MinIO
  backup:
    barmanObjectStore:
      destinationPath: s3://gitlab-backups/pg-gitlab
      endpointURL: http://gitlab-minio-svc.gitlab.svc.cluster.local:9000
      s3Credentials:
        accessKeyId:
          name: gitlab-minio-secret
          key: accesskey
        secretAccessKey:
          name: gitlab-minio-secret
          key: secretkey
      wal:
        compression: gzip
        maxParallel: 2
    retentionPolicy: "30d"

  monitoring:
    enablePodMonitor: true