Is your feature request related to a problem? Please describe.
Currently, the database storage size cannot be increased without performing a backup and full data migration. This creates operational overhead and downtime risks when storage needs grow. If the deployment supported expandable Persistent Volume Claims (PVCs), storage could be scaled seamlessly as requirements evolve.

Describe the solution you'd like
Introduce a configuration option in the deployment overlay that allows users to choose between, Node filesystem storage or PVC-backed storage using expandable volumes

When PVCs are selected, the database should leverage a StorageClass that supports volume expansion, enabling online or minimally disruptive storage resizing.