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Else it's built for each imported file, and this is very costly since when the
massive store is in use, table indexes have been dropped.

This will be done properly in next skos release which will accept extid2eid map
as optional argument.

For instance in SAEM, we need a store with custom metadata generator that will
generate ark for imported concepts.

by e.g. saem_ref which want to assign ark to created schemes.

when the instance's backend is postgres.

using SEDA 1 document type.

Related to #15524427

with some code cleanups and refactor it that we may ensure data files validity
from tests.