"""Add channel file table

Revision ID: 6283dc0e4d8d
Revises: 3e0e00844bb0
Create Date: 2025-12-10 15:11:39.424601

"""

from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
import open_webui.internal.db

# revision identifiers, used by Alembic.
revision: str = '6283dc0e4d8d'
down_revision: Union[str, None] = '3e0e00844bb0'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        'channel_file',
        sa.Column('id', sa.Text(), primary_key=True),
        sa.Column('user_id', sa.Text(), nullable=False),
        sa.Column(
            'channel_id',
            sa.Text(),
            sa.ForeignKey('channel.id', ondelete='CASCADE'),
            nullable=False,
        ),
        sa.Column(
            'file_id',
            sa.Text(),
            sa.ForeignKey('file.id', ondelete='CASCADE'),
            nullable=False,
        ),
        sa.Column('created_at', sa.BigInteger(), nullable=False),
        sa.Column('updated_at', sa.BigInteger(), nullable=False),
        # indexes
        sa.Index('ix_channel_file_channel_id', 'channel_id'),
        sa.Index('ix_channel_file_file_id', 'file_id'),
        sa.Index('ix_channel_file_user_id', 'user_id'),
        # unique constraints
        sa.UniqueConstraint('channel_id', 'file_id', name='uq_channel_file_channel_file'),  # prevent duplicate entries
    )


def downgrade() -> None:
    op.drop_table('channel_file')
