Add neuron prod DB backup and tighten actuator surface

- Add hourly restic backup CronJob to neuron-prod namespace
  - Backs up /data/neuron-prod.db to Cloudflare R2 (legion-neuron-backup bucket)
  - Retention: 24 hourly, 7 daily, 4 weekly — <$0.01/month at current DB size
  - ExternalSecret pulls restic password + R2 creds from Vault secret/r2
- Actuator exposure per environment:
  - prod: health,info only / show-details=never (no internals exposed)
  - stage: health,info,metrics,loggers / show-details=always (pre-prod visibility)
  - dev: full (health,info,metrics,env,beans,loggers,mappings) / show-details=always

servers/legion/k8s/neuron-technologies/dev/configmap.yaml

@@ -10,5 +10,6 @@ data:
   NEURON_DB_PATH: "/data/neuron-dev.db"
   NEURON_STORAGE_PATH: "/data"
   SERVER_TOMCAT_ACCESSLOG_ENABLED: "true"
-  MANAGEMENT_ENDPOINTS_WEB_EXPOSURE_INCLUDE: "health,info,metrics"
+  # Dev: full exposure for debugging
+  MANAGEMENT_ENDPOINTS_WEB_EXPOSURE_INCLUDE: "health,info,metrics,env,beans,loggers,mappings"
   MANAGEMENT_ENDPOINT_HEALTH_SHOW_DETAILS: "always"

servers/legion/k8s/neuron-technologies/prod/backup-cronjob.yaml

@@ -0,0 +1,104 @@
+---
+# neuron-backup-credentials — restic + R2 for neuron prod DB backups
+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: neuron-backup-credentials
+  namespace: neuron-prod
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    name: vault
+    kind: ClusterSecretStore
+  target:
+    name: neuron-backup-credentials
+    creationPolicy: Owner
+    template:
+      data:
+        RESTIC_PASSWORD: "{{ .restic_password }}"
+        AWS_ACCESS_KEY_ID: "{{ .r2_access_key_id }}"
+        AWS_SECRET_ACCESS_KEY: "{{ .r2_secret_access_key }}"
+        RESTIC_REPOSITORY: "s3:https://651161e0a3d321561b4c90b5bcd5f15b.r2.cloudflarestorage.com/legion-neuron-backup"
+  data:
+    - secretKey: restic_password
+      remoteRef:
+        key: secret/data/r2
+        property: neuron_restic_password
+    - secretKey: r2_access_key_id
+      remoteRef:
+        key: secret/data/r2
+        property: access_key_id
+    - secretKey: r2_secret_access_key
+      remoteRef:
+        key: secret/data/r2
+        property: secret_access_key
+---
+# Hourly neuron prod DB backup to Cloudflare R2 via restic.
+# Retention: 24 hourly, 7 daily, 4 weekly.
+# At current DB size (~10MB) this is <$0.01/month.
+# Mounts neuron-prod-data PVC read-only — safe on single-node k3s.
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: neuron-db-backup
+  namespace: neuron-prod
+spec:
+  schedule: "0 * * * *"
+  concurrencyPolicy: Forbid
+  failedJobsHistoryLimit: 3
+  successfulJobsHistoryLimit: 3
+  jobTemplate:
+    spec:
+      backoffLimit: 2
+      template:
+        spec:
+          restartPolicy: OnFailure
+          containers:
+            - name: backup
+              image: restic/restic:latest
+              command:
+                - /bin/sh
+                - -c
+                - |
+                  set -e
+
+                  # Init repo on first run (no-op if already initialized)
+                  restic snapshots 2>/dev/null || restic init
+
+                  # Backup the SQLite DB file (WAL mode: exclude -shm/-wal, they're volatile)
+                  echo "Backing up neuron prod DB..."
+                  restic backup \
+                    /data/neuron-prod.db \
+                    --tag neuron-prod \
+                    --host legion \
+                    --exclude '*.db-shm' \
+                    --exclude '*.db-wal'
+
+                  # Prune: 24 hourly, 7 daily, 4 weekly
+                  restic forget \
+                    --keep-hourly 24 \
+                    --keep-daily 7 \
+                    --keep-weekly 4 \
+                    --prune
+
+                  echo "Backup complete."
+                  restic snapshots --latest 3
+              envFrom:
+                - secretRef:
+                    name: neuron-backup-credentials
+              volumeMounts:
+                - name: data
+                  mountPath: /data
+                  readOnly: true
+              resources:
+                requests:
+                  memory: 128Mi
+                  cpu: 50m
+                limits:
+                  memory: 256Mi
+                  cpu: 200m
+          volumes:
+            - name: data
+              persistentVolumeClaim:
+                claimName: neuron-prod-data
+                readOnly: true

servers/legion/k8s/neuron-technologies/prod/configmap.yaml

@@ -8,5 +8,6 @@ data:
   NEURON_DB_PATH: "/data/neuron-prod.db"
   NEURON_STORAGE_PATH: "/data"
   SERVER_TOMCAT_ACCESSLOG_ENABLED: "true"
-  MANAGEMENT_ENDPOINTS_WEB_EXPOSURE_INCLUDE: "health,info,metrics"
-  MANAGEMENT_ENDPOINT_HEALTH_SHOW_DETAILS: "always"
+  # Prod: minimal surface — never expose internals
+  MANAGEMENT_ENDPOINTS_WEB_EXPOSURE_INCLUDE: "health,info"
+  MANAGEMENT_ENDPOINT_HEALTH_SHOW_DETAILS: "never"

servers/legion/k8s/neuron-technologies/prod/kustomization.yaml

@@ -8,3 +8,4 @@ resources:
   - rest-deployment.yaml
   - services.yaml
   - ingress.yaml
+  - backup-cronjob.yaml

servers/legion/k8s/neuron-technologies/stage/configmap.yaml

@@ -8,5 +8,6 @@ data:
   NEURON_DB_PATH: "/data/neuron-stage.db"
   NEURON_STORAGE_PATH: "/data"
   SERVER_TOMCAT_ACCESSLOG_ENABLED: "true"
-  MANAGEMENT_ENDPOINTS_WEB_EXPOSURE_INCLUDE: "health,info,metrics"
+  # Stage: extended for pre-prod verification, not fully open
+  MANAGEMENT_ENDPOINTS_WEB_EXPOSURE_INCLUDE: "health,info,metrics,loggers"
   MANAGEMENT_ENDPOINT_HEALTH_SHOW_DETAILS: "always"