Add db-backup script and environment config

config/environments.yml

@@ -0,0 +1,13 @@
+environments:
+  dev:
+    host: dev.nexus.local
+    replicas: 1
+    log_level: debug
+  staging:
+    host: staging.nexus.local
+    replicas: 2
+    log_level: info
+  prod:
+    host: prod.nexus.local
+    replicas: 5
+    log_level: warn

scripts/db-backup.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# Trigger a manual snapshot of the production RDS instance.
+set -euo pipefail
+
+INSTANCE="nexus-prod-postgres"
+TIMESTAMP=$(date +%Y%m%d-%H%M%S)
+SNAP_ID="manual-$TIMESTAMP"
+
+echo "[backup] Creating snapshot: $SNAP_ID"
+aws rds create-db-snapshot \
+    --db-instance-identifier "$INSTANCE" \
+    --db-snapshot-identifier "$SNAP_ID" \
+    --region eu-central-1
+
+echo "[backup] Snapshot requested. Use 'aws rds describe-db-snapshots' to check status."