Add migration for Book

alembic/versions/20250325_161934_7c0930cb_create_book.py

@@ -0,0 +1,40 @@
+"""create books table
+
+Revision ID: 1234567890ab
+Revises: 
+Create Date: 2023-05-25 10:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.sql import func
+
+
+# revision identifiers, used by Alembic
+revision = '1234567890ab'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Create books table
+    op.create_table(
+        'books',
+        sa.Column('id', sa.Integer, primary_key=True, index=True),
+        sa.Column('title', sa.String, index=True),
+        sa.Column('author', sa.String, index=True),
+        sa.Column('description', sa.String),
+        sa.Column('published_year', sa.Integer),
+        sa.Column('isbn', sa.String, unique=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():
+    # Drop books table
+    op.drop_table('books')
+```
+
+This Alembic migration script creates a new table called 'books' with the specified columns and constraints. The `upgrade()` function creates the table, while the `downgrade()` function drops the table. Note the use of `server_default=func.now()` for the `created_at` and `updated_at` columns to automatically set the timestamp on record creation and update, respectively.