"""ai_avatar_render_jobs.script_id 放宽为可空串（手动文案直生场景不关联文案库）

Revision ID: 074_render_script_id_optional
Revises: 073_add_lipsync_tts_fields
Create Date: 2026-09-09
"""

import sqlalchemy as sa

from alembic import op

revision = "074_render_script_id_optional"
down_revision = "073_add_lipsync_tts_fields"
branch_labels = None
depends_on = None


def upgrade() -> None:
    # 列保持 NOT NULL（空串占位），仅应用层允许不传；这里显式补 server_default 防止历史约束歧义
    with op.batch_alter_table("ai_avatar_render_jobs") as batch:
        batch.alter_column(
            "script_id",
            existing_type=sa.String(length=36),
            nullable=False,
            server_default="",
        )


def downgrade() -> None:
    with op.batch_alter_table("ai_avatar_render_jobs") as batch:
        batch.alter_column(
            "script_id",
            existing_type=sa.String(length=36),
            nullable=False,
            server_default=None,
        )