'How to use a standalone Operations instance and rollback changes?
The Alembic documentation states that "a standalone Operations instance can be made for use cases external to regular Alembic migrations by passing in a MigrationContext". An example is given:
from alembic.migration import MigrationContext
from alembic.operations import Operations
conn = myengine.connect()
ctx = MigrationContext.configure(conn)
op = Operations(ctx)
op.alter_column("t", "c", nullable=True)
How can this be done as a transaction? In other words, how can these operations be rolled back?
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