"""#1894: drop obsolete script title fields (title_text/title_category/title_config)

Revision ID: 078_drop_script_title_fields
Revises: 077_merge_title_libs
Create Date: 2026-09-16

口播文案（scripts）不再自带配套标题、标题分类和标题样式字段。
智能剪辑 / AI 数字人等生成场景各自通过入参配置标题，不再从文案读取。
保留字段：title（名称）、content（正文）、segments（分段）、tags（标签）。
"""

import sqlalchemy as sa

from alembic import op

revision = "078_drop_script_title_fields"
down_revision = "077_merge_title_libs"
branch_labels = None
depends_on = None


def upgrade() -> None:
    with op.batch_alter_table("scripts") as batch:
        batch.drop_column("title_config")
        batch.drop_column("title_category")
        batch.drop_column("title_text")


def downgrade() -> None:
    with op.batch_alter_table("scripts") as batch:
        batch.add_column(sa.Column("title_text", sa.String(500), nullable=False, server_default=""))
        batch.add_column(sa.Column("title_category", sa.String(50), nullable=False, server_default=""))
        batch.add_column(sa.Column("title_config", sa.JSON, nullable=False, server_default="{}"))