"""add_constraint_to_artist_external_id

Revision ID: f7e70bb35433
Revises: 46cae01b9a8b
Create Date: 2021-01-22 14:54:11.939566

"""
from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision = 'f7e70bb35433'
down_revision = '46cae01b9a8b'
branch_labels = None
depends_on = None


def upgrade():
    op.create_check_constraint(op.f("ck_Artist_external_id_value_format"), "Artist", "external_id ~ '^GRAS_\d*$'")


def downgrade():
    op.drop_constraint(op.f('ck_Artist_external_id_value_format'), 'Artist')