Enhancement: Custom database backup commands for automated database backup scheduling

[ArshadBhura]

Problem

The current automated backup scheduling for databases work well in most cases, but do not allow for custom flags or parameters when executing. For example, I would like to be able to exclude certain schemas from my postgres database backup, but cannot easily do that within the existing setup.

Proposed Solution

Allow the user to configure the command as a text field override within the schedule backup settings: