"""tombstone for reverted calendar subscriptions

Revision ID: 0020_calendar_subscriptions
Revises: 0019_backup_imports

The calendar subscription feature (backend/calendar.py, backend/calendar_router.py)
was reverted from main, but this revision id was already applied to the production
database. Keeping an empty migration under the same revision id lets
`alembic upgrade head` succeed on databases stamped at this revision.
"""

from alembic import op  # noqa: F401

revision = "0020_calendar_subscriptions"
down_revision = "0019_backup_imports"
branch_labels = None
depends_on = None


def upgrade() -> None:
    # Intentionally empty: the feature was reverted. The leftover
    # calendar_subscriptions table on already-migrated databases is harmless
    # and intentionally left in place.
    pass


def downgrade() -> None:
    pass