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"""add dag_stats table

Revision ID: f2ca10b85618
Revises: 64de9cddf6c9
Create Date: 2016-07-20 15:08:28.247537

"""
import sqlalchemy as sa
from alembic import op

from airflow.models.base import COLLATION_ARGS

# revision identifiers, used by Alembic.
revision = 'f2ca10b85618'
down_revision = '64de9cddf6c9'
branch_labels = None
depends_on = None


def upgrade():
    op.create_table(
        'dag_stats',
        sa.Column('dag_id', sa.String(length=250, **COLLATION_ARGS), nullable=False),
        sa.Column('state', sa.String(length=50), nullable=False),
        sa.Column('count', sa.Integer(), nullable=False, default=0),
        sa.Column('dirty', sa.Boolean(), nullable=False, default=False),
        sa.PrimaryKeyConstraint('dag_id', 'state'),
    )


def downgrade():
    op.drop_table('dag_stats')