Provide APIs to query meta-data about the contents of the data store #23
Description
It would be useful if meta-data about the contents of the data-store could be queried externally. For example:
- A human readable comment describing the contents of the data store.
- Upload history.
- The time of the each (full or incremental) update to the data store.
- Information about the data used (file size, last modified time, source URL, if any).
- Information about the OSM elements available in the data store, perhaps in the form of a min--max range for each type of element.