Have comments on all columns of all databases

Check the databases have the necessary comments on their column.

Services/modules concerned are:

• swh-storage
• swh-scheduler
• swh-indexer

Each of those modules should have a folder sql containing an existing schema file. This should be amended to add the necessary information (missing column description).

This implies also a sql/upgrade/.sql file with the diff amending the schema. (One can use swh/devel/swh-indexer!138 (closed) as a model to see how to proceed)

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Migrated from T1527 (view on Phabricator)