"""Initiation

Revision ID: 755dc1afb8ad
Revises: 
Create Date: 2025-10-20 19:34:20.258554

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = '755dc1afb8ad'
down_revision: Union[str, Sequence[str], None] = None
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    """Upgrade schema."""
    # ### commands auto generated by Alembic - please adjust! ###
    op.create_table('mapping',
    sa.Column('mapping_id', sa.String(length=36), nullable=False),
    sa.Column('source_dataset_id', sa.String(length=36), nullable=False, comment='源数据集ID'),
    sa.Column('labelling_project_id', sa.String(length=36), nullable=False, comment='标注项目ID'),
    sa.Column('labelling_project_name', sa.String(length=255), nullable=True, comment='标注项目名称'),
    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True, comment='创建时间'),
    sa.Column('last_updated_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True, comment='最后更新时间'),
    sa.Column('deleted_at', sa.DateTime(timezone=True), nullable=True, comment='删除时间'),
    sa.PrimaryKeyConstraint('mapping_id')
    )
    # ### end Alembic commands ###


def downgrade() -> None:
    """Downgrade schema."""
    # ### commands auto generated by Alembic - please adjust! ###
    op.drop_table('mapping')
    # ### end Alembic commands ###