"""三界作用域与消息版本谱系

Revision ID: 8f48659a83f6
Revises: 5cf6d328c10a
Create Date: 2026-09-10 13:22:56.404702

"""
from collections.abc import Sequence

import sqlalchemy as sa

from alembic import op

# revision identifiers, used by Alembic.
revision: str = '8f48659a83f6'
down_revision: str | Sequence[str] | None = '5cf6d328c10a'
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    """Upgrade schema."""
    # ### commands auto generated by Alembic - please adjust! ###
    op.add_column('conversation', sa.Column('realm', sa.String(), nullable=False))
    op.add_column('message', sa.Column('realm', sa.String(), nullable=False))
    op.add_column('message', sa.Column('canonized_at', sa.DateTime(timezone=True), nullable=True))
    op.add_column('message', sa.Column('parent_message_id', sa.String(), nullable=True))
    op.add_column('message', sa.Column('variant_kind', sa.String(), nullable=False))
    op.create_foreign_key(op.f('fk_message_message'), 'message', 'message', ['parent_message_id'], ['id'], ondelete='set null')
    # ### end Alembic commands ###


def downgrade() -> None:
    """Downgrade schema."""
    # ### commands auto generated by Alembic - please adjust! ###
    op.drop_constraint(op.f('fk_message_message'), 'message', type_='foreignkey')
    op.drop_column('message', 'variant_kind')
    op.drop_column('message', 'parent_message_id')
    op.drop_column('message', 'canonized_at')
    op.drop_column('message', 'realm')
    op.drop_column('conversation', 'realm')
    # ### end Alembic commands ###