def upgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.drop_constraint('GradeHistory_Work_id_fkey', 'GradeHistory', type_='foreignkey')
op.create_foreign_key('GradeHistory_Work_id_fkey', 'GradeHistory', 'Work', ['Work_id'], ['id'], ondelete='CASCADE')
# ### end Alembic commands ###
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