Experimental changes to Vervis.

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TODO

migrations /

2016_09_01_just_workflow.model

-- This is in a separate file from the rest of the entities added on the same
-- day because it is used for creating a dummy public workflow for DB
-- migrations. Since each project is required to have a workflow, and initially
-- there's none, we make a dummy one.
--
-- Since the 'Sharer' entity isn't defined here, using the Workflow entity
-- below with the @persistent@ model parser will probably create an 'EntityDef'
-- in which the sharer field does NOT have a foreign key constraint into the
-- 'Sharer' table, because the parser won't recognize that 'SharerId' is an
-- entity ID and not just some other existing type.
--
-- However that is okay because we're just using this entity for insertion
-- once, where we make sure to use a real existing sharer ID, and we also of
-- course use it for adding the entity to the database schema, but that
-- mechanism has its own way to detect the foreign keys.
Workflow
    sharer SharerId
    ident  WflIdent
    name   Text          Maybe
    desc   Text          Maybe

    UniqueWorkflow sharer ident
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