"""add depends to tasks

Revision ID: 10459dd24d3d
Revises: 17946e7038d7
Create Date: 2020-05-21 11:07:46.953781

"""
from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision = '10459dd24d3d'
down_revision = '17946e7038d7'
branch_labels = None
depends_on = None


def upgrade():
    op.create_table(
        'depends',
        sa.Column('first_id', sa.Integer, sa.ForeignKey('tasks.id'), primary_key=True),
        sa.Column('second_id', sa.Integer, sa.ForeignKey('tasks.id'), primary_key=True)
    )


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