"""fix news_articles url uniqueness to per-bill scope

Previously url was globally unique, meaning the same article could only
be stored for one bill. This changes it to (bill_id, url) unique so the
same article can appear in multiple bills' news panels.

Revision ID: 0009
Revises: 0008
Create Date: 2026-03-01
"""
import sqlalchemy as sa
from alembic import op

revision = "0009"
down_revision = "0008"
branch_labels = None
depends_on = None


def upgrade():
    # Drop the old global unique constraint on url
    op.drop_constraint("news_articles_url_key", "news_articles", type_="unique")
    # Add per-bill unique constraint
    op.create_unique_constraint("uq_news_articles_bill_url", "news_articles", ["bill_id", "url"])


def downgrade():
    op.drop_constraint("uq_news_articles_bill_url", "news_articles", type_="unique")
    op.create_unique_constraint("news_articles_url_key", "news_articles", ["url"])