"""Question difficulty tagging.

Revision ID: m6a7b8c9d031
Revises: l5a6b7c8d920
"""
from alembic import op

revision = "m6a7b8c9d031"
down_revision = "l5a6b7c8d920"
branch_labels = None
depends_on = None


def upgrade():
    op.execute("ALTER TABLE questions ADD COLUMN IF NOT EXISTS difficulty VARCHAR(10)")


def downgrade():
    op.execute("ALTER TABLE questions DROP COLUMN IF EXISTS difficulty")