[migration] More resilient migration script Query the information schema to retrieve existing constraint (primary key and unique) and drop them. Thus don't use anymore DROP CONSTRAINT IF EXISTS (not implemented by e.g. old versions of sqlserver). To do so a missing DISTINCT was necessary to avoid duplicates.

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#!/usr/bin/env python

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from cubicweb.cwctl import run

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import sys

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run(sys.argv[1:])