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Donkie
332b3e0fe4
This reverts 9aea271.
The column bought one thing, that phase 2 would need no migration, and
cost something worse: it commits the schema to a shape nobody has run a
decoder against. Width, and above all the choice not to make it unique,
were read off a design document rather than off working code, and
goeland86's codec in #880 computes an effective_instance_uuid that may
not mean the same thing. Getting that wrong leaves us altering a
populated column on four databases, which is the exact operation the
"settle the shape before release" rule exists to avoid.
That rule earns its keep for target_type, target_value and filament_id,
where retrofitting a discriminator or a nullability change is painful.
Appending one nullable column later is not painful, so phase 2 can add
it when there is something to write into it.