"""Remove persisted announcement sources and interpretations; use memory only."""
import sqlalchemy as sa
from alembic import op

revision = "0017"
down_revision = "0016"
branch_labels = None
depends_on = None


def upgrade():
    cache = sa.table("home_information", sa.column("resource", sa.String()))
    op.execute(cache.delete().where(cache.c.resource.like("messages:%")))


def downgrade():
    # Platform cache is reproducible; deleted text and interpretations are not restored.
    pass