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"""Add ``pool_slots`` field to ``task_instance``

Revision ID: a4c2fd67d16b
Revises: 7939bcff74ba
Create Date: 2020-01-14 03:35:01.161519

"""
from __future__ import annotations

import sqlalchemy as sa
from alembic import op

# revision identifiers, used by Alembic.
revision = 'a4c2fd67d16b'
down_revision = '7939bcff74ba'
branch_labels = None
depends_on = None
airflow_version = '1.10.10'


def upgrade():
    op.add_column('task_instance', sa.Column('pool_slots', sa.Integer, default=1))


def downgrade():
    op.drop_column('task_instance', 'pool_slots')
