The Global TAP Schema

The idea of this service is to collect the column information from
all TAP services in the VO.

To do that, we query the relational registry for new TAP servers and
update the glots.services table based on that.  Based on that,
bin/ingest.py goes through the service table and tries to update each service
in turn.

All this happens in am execute element scheduled to run twice daily.
TAP services are only hit every harvestInterval days; that's defined
to be 30 by default in bin/retrieveServices, but it can be manually
overridden by just updating the DB table.

NOTE: This service needs the pg_trgm extension (Debian: postgresql-contrib).
Hence, before importing, run

  CREATE EXTENSION pg_trgm;


To (re-) create such a GloTS instance, say

	gavo imp glots/q createTables


To manually start a normal update (also use this to initially populate
the tables), run

	python3 bin/retrieveTAPServices.py
	python3 bin/ingest.py

To do an extra harvest for a specific service, say

	python3 bin/ingest.py -fi ivo://org.gavo.dc/tap


Sometimes data centers hide their tables in the run-up to a release
but want the tables in before that.  If that happens, tell them to
send you the contents of their (new) tables enpoint and run::

  python3 bin/fromvosi.py <their-ivoid> <tables-dump>