# A StatefulSet rather than a Deployment: one identity, one volume, and no
# window where two pods hold the same data directory. The volumeClaimTemplate
# also means the claim is not deleted with the workload — losing the workflows
# to a `kubectl delete deploy` would be an avoidable way to lose them.
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: n8n-postgres
  namespace: n8n
spec:
  serviceName: n8n-postgres
  replicas: 1
  selector:
    matchLabels:
      app: n8n-postgres
  template:
    metadata:
      labels:
        app: n8n-postgres
    spec:
      securityContext:
        fsGroup: 999
      containers:
        - name: postgres
          image: postgres:16.10-alpine
          ports:
            - name: postgres
              containerPort: 5432
          env:
            - name: POSTGRES_USER
              value: n8n
            - name: POSTGRES_DB
              value: n8n
            - name: POSTGRES_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: n8n-secrets
                  key: DB_PASSWORD
            # The image initialises into this directory. Naming a subdirectory
            # of the mount rather than the mount itself keeps initdb away from
            # the lost+found some volume types leave at the root.
            - name: PGDATA
              value: /var/lib/postgresql/data/pgdata
          volumeMounts:
            - name: data
              mountPath: /var/lib/postgresql/data
          readinessProbe:
            exec:
              command: ["pg_isready", "-U", "n8n", "-d", "n8n"]
            initialDelaySeconds: 5
            periodSeconds: 10
          livenessProbe:
            exec:
              command: ["pg_isready", "-U", "n8n", "-d", "n8n"]
            initialDelaySeconds: 30
            periodSeconds: 20
          resources:
            requests:
              cpu: 50m
              memory: 256Mi
            limits:
              cpu: "1"
              memory: 1Gi
  volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 5Gi