"""add_missing_sentiment_fields

Revision ID: 059724556401
Revises: a7b9c1d3ef67
Create Date: 2026-05-23 17:19:50.789398

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = '059724556401'
down_revision: Union[str, Sequence[str], None] = 'a7b9c1d3ef67'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    """Upgrade schema."""
    # 添加情感分析字段到 citation_records 表
    op.add_column('citation_records',
        sa.Column('sentiment', sa.String(20), nullable=True,
                  comment='情感倾向: positive / neutral / negative')
    )
    op.add_column('citation_records',
        sa.Column('sentiment_confidence', sa.Float(), nullable=True,
                  comment='情感分析置信度 0.0-1.0')
    )
    op.add_column('citation_records',
        sa.Column('sentiment_key_phrases', sa.JSON(), nullable=True,
                  comment='关键情感短语列表')
    )


def downgrade() -> None:
    """Downgrade schema."""
    op.drop_column('citation_records', 'sentiment_key_phrases')
    op.drop_column('citation_records', 'sentiment_confidence')
    op.drop_column('citation_records', 'sentiment')
