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End-to-end migration execution - load migrations and run them up or down
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Migrate the database up to the given targets.
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Take a list of 2-tuples of the form (migration instance, False) and
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Take a list of 2-tuples of the form (migration instance, True) and
unapply them in reverse order they occur in the full_plan.
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the plan.
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Mark replacement migrations applied if their replaced set all are.
Do this unconditionally on every migrate, rather than just when
migrations are applied or unapplied, to correctly handle the case
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all its replaced migrations applied. In this case no new migration will
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Test whether a migration has been implicitly applied - that the
tables or columns it would create exist. This is intended only for use
on initial migrations (as it only looks for CreateModel and AddField).
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