Config holds a zed schema and a tablemapping that generates that schema.

InternalRowMapping is a RowMapping with column names converted into column indexes, so that it can be used to parse the replication log.

InternalTableMapping is a TableMapping with table names converted into internal postgres ids, so that it can be used to parse the replication log.

RowMapping configures how to transform a row into a relationship.

TableMapping maps the name of a table to a set of configs for transforming rows into relationships.