"""accent-insensitive feed search (unaccent)

Revision ID: 0029_unaccent_search
Revises: 0028_live_search_provenance
Create Date: 2026-06-29

Enables the PostgreSQL `unaccent` contrib extension so the feed's text search can match
regardless of diacritics — e.g. searching "tiesto" finds titles spelled "Tiësto". The feed
query wraps both sides in unaccent(); this migration just makes the function available.
`unaccent` ships with the official postgres image (postgresql-contrib). The DB role is a
superuser in our deployments, so CREATE EXTENSION succeeds; IF NOT EXISTS keeps it idempotent.
"""
from typing import Sequence, Union

from alembic import op

revision: str = "0029_unaccent_search"
down_revision: Union[str, None] = "0028_live_search_provenance"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.execute("CREATE EXTENSION IF NOT EXISTS unaccent")


def downgrade() -> None:
    # Intentionally left in place: other code/queries may rely on unaccent() and dropping a
    # contrib extension is rarely what's wanted on a downgrade. (The feed query reverts with
    # the code, not this migration.)
    pass
