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"""add index to taskinstance

Revision ID: bf00311e1990
Revises: dd25f486b8ea
Create Date: 2018-09-12 09:53:52.007433

"""

from alembic import op

# revision identifiers, used by Alembic.
revision = 'bf00311e1990'
down_revision = 'dd25f486b8ea'
branch_labels = None
depends_on = None


def upgrade():
    op.create_index(
        'ti_dag_date',
        'task_instance',
        ['dag_id', 'execution_date'],
        unique=False
    )


def downgrade():
    op.drop_index('ti_dag_date', table_name='task_instance')
