Ask HN: UI for editing YAML/JSON backed by version control

Is there an existing service that exposes a web UI to guide folks editing a JSON or YAML configuration according to some schema? It should store each edited file with full audit/revision history (or even better, just be backed by git).

The goal is to make it easier for non-technical folks to safely editing config files at a higher level while retaining the benefits of version control systems.

Edit: they shouldn't have to know they're editing YAML or JSON. The ideal would be the equivalent of a GUI SQL query builder but for config files.