"""cache each user's own YouTube channel id

Revision ID: 0019_user_yt_channel_id
Revises: 0018_maintenance_batch_setting
Create Date: 2026-06-19

Adds users.yt_channel_id: the user's own YouTube channel id, resolved lazily from
channels.list?mine=true and cached. Used to exclude the user's own channel from the
playlist-discovery list (you don't subscribe to yourself). NULL = not resolved yet.
Purely additive.
"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "0019_user_yt_channel_id"
down_revision: Union[str, None] = "0018_maintenance_batch_setting"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.add_column("users", sa.Column("yt_channel_id", sa.String(length=32), nullable=True))


def downgrade() -> None:
    op.drop_column("users", "yt_channel_id")