"""Add PublicStream model

Revision ID: 0df481ee920b
Revises: f86c93c7a872
Create Date: 2025-07-19 10:02:22.902696

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = '0df481ee920b'
down_revision: Union[str, Sequence[str], None] = 'f86c93c7a872'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    """Upgrade schema."""
    # ### commands auto generated by Alembic - please adjust! ###
    # First create the new publicstream table
    op.create_table('publicstream',
    sa.Column('uid', sa.String(), nullable=False),
    sa.Column('size', sa.Integer(), nullable=False),
    sa.Column('mtime', sa.Integer(), nullable=False),
    sa.Column('created_at', sa.DateTime(), nullable=False),
    sa.Column('updated_at', sa.DateTime(), nullable=False),
    sa.PrimaryKeyConstraint('uid')
    )
    
    # Drop the foreign key constraint first
    op.drop_constraint('dbsession_user_id_fkey', 'dbsession', type_='foreignkey')
    
    # Then drop the unique constraint
    op.drop_constraint(op.f('uq_user_username'), 'user', type_='unique')
    
    # Create the new index
    op.create_index(op.f('ix_user_username'), 'user', ['username'], unique=True)
    
    # Recreate the foreign key constraint
    op.create_foreign_key(
        'dbsession_user_id_fkey', 'dbsession', 'user',
        ['user_id'], ['username'], ondelete='CASCADE'
    )
    # ### end Alembic commands ###


def downgrade() -> None:
    """Downgrade schema."""
    # ### commands auto generated by Alembic - please adjust! ###
    # Drop the foreign key constraint first
    op.drop_constraint('dbsession_user_id_fkey', 'dbsession', type_='foreignkey')
    
    # Drop the index
    op.drop_index(op.f('ix_user_username'), table_name='user')
    
    # Recreate the unique constraint
    op.create_unique_constraint(op.f('uq_user_username'), 'user', ['username'])
    
    # Recreate the foreign key constraint
    op.create_foreign_key(
        'dbsession_user_id_fkey', 'dbsession', 'user',
        ['user_id'], ['username'], ondelete='CASCADE'
    )
    
    # Drop the publicstream table
    op.drop_table('publicstream')
    # ### end Alembic commands ###