"""create books table
Revision ID: 1a2b3c4d5e6f
Revises:
Create Date: 2023-06-08 10:00:00.000000
"""
from alembic import op
import sqlalchemy as sa
from sqlalchemy.sql import func

# revision identifiers
revision = '1a2b3c4d5e6f'
down_revision = None
branch_labels = None
depends_on = None

def upgrade():
    op.create_table(
        'books',
        sa.Column('id', sa.Integer, primary_key=True, index=True),
        sa.Column('title', sa.String, nullable=False),
        sa.Column('author', sa.String, nullable=False),
        sa.Column('description', sa.String),
        sa.Column('published_year', sa.Integer),
        sa.Column('isbn', sa.String, unique=True, index=True),
        sa.Column('created_at', sa.DateTime, server_default=func.now()),
        sa.Column('updated_at', sa.DateTime, server_default=func.now(), onupdate=func.now())
    )

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