"""Add photos.nextcloud_fileid for NC preview proxying

Revision ID: 0018_photos_nextcloud_fileid
Revises: 0017_photos_list_index
Create Date: 2026-05-11

The thumbnail endpoint will proxy Nextcloud's /index.php/core/preview
instead of generating and serving its own WebP cache under /data/thumbs.
That requires storing each photo's Nextcloud numeric fileid alongside
the row. NULL is allowed because legacy / non-NC photos still exist
and the handler keeps the on-disk fallback for them.
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "0018_photos_nextcloud_fileid"
down_revision: Union[str, None] = "0017_photos_list_index"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column(
        "photos",
        sa.Column("nextcloud_fileid", sa.Integer(), nullable=True),
    )
    op.create_index(
        "ix_photos_nextcloud_fileid",
        "photos",
        ["nextcloud_fileid"],
    )


def downgrade() -> None:
    op.drop_index("ix_photos_nextcloud_fileid", table_name="photos")
    op.drop_column("photos", "nextcloud_fileid")