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- import sqlalchemy as sa
- from alembic import op
- from sqlalchemy.dialects import mysql
- revision = "0020_knowledge_source_text"
- down_revision = "0019_ticket_listing"
- branch_labels = None
- depends_on = None
- def upgrade():
- # 已有分段无法保证恢复原始空白和重叠边界，保留 null 供前端明确提示。
- op.add_column(
- "knowledge_documents", sa.Column("source_text", mysql.MEDIUMTEXT(), nullable=True)
- )
- def downgrade():
- op.drop_column("knowledge_documents", "source_text")
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