I am looking since a long time for a selfhosted tool that would allow the user to insert and visualize data in a hierarchycal structure (tree). Ideally custom schemas could be defined so that it can be also regarded as a rudimentary noSQL database. I've looked at the awesome-selfhosted page high and low for anything similar with no luck. Do you happen to know anything that could work? The best example for the functionality I am looking for is the open source desktop app treeline
What you're describing sounds a lot like LDAP, but it could be I'm just triggered by "schemas." LDAP would be the backend; there's a whole slew of LDAP browsers, but none of them really seem like they're targeted at users.
Most of what you'll find is user management and system administration, because LDAP is a common backend for user authentication &c at larger sites, but there's no reason it can't store arbitrary data. https://openldap.org/ slapd on the backend and maybe https://directory.apache.org/studio/ on the frontend. But since it's built around user authentication, it has layers of security and access control that really complicate understanding the actual system.
I see, it gets complicated enough for me, I cannot imagine for some of the other users I would like to target... I will probably look into it as a last resort. Thanks