Draft: 385 add thing management schema
adds DB schema for thing-management-api: https://codebase.helmholtz.cloud/ufz-tsm/thing-management/backend/-/merge_requests/1
Edited by Florian Gransee
adds DB schema for thing-management-api: https://codebase.helmholtz.cloud/ufz-tsm/thing-management/backend/-/merge_requests/1