"""add system_settings table

Revision ID: f6a7b8c9d0e1
Revises: e5f6a7b8c9d0
Create Date: 2026-04-05

"""
from alembic import op
import sqlalchemy as sa

revision = 'f6a7b8c9d0e1'
down_revision = 'e5f6a7b8c9d0'
branch_labels = None
depends_on = None


def upgrade():
    op.create_table(
        'system_settings',
        sa.Column('key', sa.String(100), primary_key=True),
        sa.Column('value', sa.Text(), nullable=False),
        sa.Column('description', sa.Text(), nullable=True),
        sa.Column('updated_at', sa.TIMESTAMP(), server_default=sa.text('now()')),
    )
    # 插入默认值
    op.execute("""
        INSERT INTO system_settings (key, value, description)
        VALUES ('check_interval_seconds', '1800', '定时检查间隔（秒），最小 300（5分钟）')
    """)


def downgrade():
    op.drop_table('system_settings')