"""Make users.phone nullable."""
revision = "0010"
down_revision = "0009"
branch_labels = None
depends_on = None

from alembic import op
import sqlalchemy as sa


def upgrade():
    op.alter_column("users", "phone", existing_type=sa.String(20), nullable=True)


def downgrade():
    op.execute("UPDATE users SET phone = '' WHERE phone IS NULL")
    op.alter_column("users", "phone", existing_type=sa.String(20), nullable=False)