apiVersion: postgresql.cnpg.io/v1
kind: Cluster
metadata:
  name: timescale-cluster
spec:
  instances: 3
  imageName: ghcr.io/cloudnative-pg/postgresql:15
  bootstrap:
    initdb:
      database: app
      owner: app  
      postInitSQL:
        - CREATE EXTENSION IF NOT EXISTS timescaledb;
  storage:
    size: 50Gi
  resources:
    requests:
      memory: "2Gi"
      cpu: "500m"
    limits:
      memory: "4Gi"
      cpu: "2"
  affinity:
    enablePodAntiAffinity: true
    topologyKey: kubernetes.io/hostname
  monitoring:
    enablePodMonitor: true
  postgresql:
    parameters:
      max_connections: "100"        # mehr Verbindungen 200
      shared_buffers: "256MB"       # Cache im RAM 1GB
      effective_cache_size: "3GB"   # Optimizer hint
      work_mem: "16MB"              # pro Query
      maintenance_work_mem: "256MB" # für VACUUM/REINDEX
      wal_buffers: "16MB"
      checkpoint_completion_target: "0.9"
      random_page_cost: "1.1"       # SSD optimiert
      effective_io_concurrency: "200"
      shared_preload_libraries: "timescaledb"
  backup:
    retentionPolicy: "7d"   # Backup älter als 7 Tage -> automatisch gelöscht
    barmanObjectStore:
      destinationPath: "s3://backups/"
      endpointURL: "http://minio.minio-system.svc.cluster.local:9000"
      s3Credentials:
        accessKeyId:
          name: s3-creds
          key: S3_ACCESS_KEY_ID
        secretAccessKey:
          name: s3-creds
          key: S3_SECRET_ACCESS_KEY
      wal:
        compression: gzip