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roles/svc-rdbms-postgres/Upgrade.md

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+# PostgreSQL Docker Upgrade: Major Version Migration
+
+This guide explains how to safely upgrade a PostgreSQL Docker container from one major version to another (e.g., version 12 to 16) using a **dump and restore** method. This is the recommended approach in Docker environments.
+
+---
+
+## ⚠️ Important
+PostgreSQL data directories are **not compatible across major versions**. You cannot just point a newer version to the old data volume. You must export and re-import your data.
+
+## Backup
+First do a backup
+
+## Restore
+Setup new Version and apply restore_postgres_databases.py.
+
+## 🔗 References
+- [PostgreSQL Backup Documentation](https://www.postgresql.org/docs/current/backup-dump.html)
+- [PostgreSQL Docker Image](https://hub.docker.com/_/postgres)
+