A table that maps IDs of elements to IDs of other elements to which they are related.
For example, mapping Nodes to the Ways that they are part of, or mapping any elements
(Nodes, Ways, Relations) to the Relations that the elements are members of.
A handle which can be used to read from the Database. The handle
ensures that all reads see the same snapshot of the data, even if
it is being modified simultaneously by another process.
A table which maps OSM Node IDs to structs containing the Node’s tags and metadata.
Untagged nodes are omitted from this table (they only exist in the Locations table).