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"""Add ``DagTags`` table

Revision ID: 7939bcff74ba
Revises: fe461863935f
Create Date: 2020-01-07 19:39:01.247442

"""

import sqlalchemy as sa
from alembic import op

from airflow.migrations.db_types import StringID

# revision identifiers, used by Alembic.
revision = '7939bcff74ba'
down_revision = 'fe461863935f'
branch_labels = None
depends_on = None
airflow_version = '1.10.8'


def upgrade():
    """Apply Add ``DagTags`` table"""
    op.create_table(
        'dag_tag',
        sa.Column('name', sa.String(length=100), nullable=False),
        sa.Column('dag_id', StringID(), nullable=False),
        sa.ForeignKeyConstraint(
            ['dag_id'],
            ['dag.dag_id'],
        ),
        sa.PrimaryKeyConstraint('name', 'dag_id'),
    )


def downgrade():
    """Unapply Add ``DagTags`` table"""
    op.drop_table('dag_tag')
