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import { DynamoDBClient } from '@aws-sdk/client-dynamodb'; import { DynamoDBDocumentClient, PutCommand, QueryCommand } from '@aws-sdk/lib-dynamodb'; const client = DynamoDBDocumentClient.from(new DynamoDBClient({ region: 'ap-south-1' })); // Single-table design: user and their orders in one table await client.send(new PutCommand({ TableName: 'AppTable', Item: { PK: 'USER#user-123', SK: 'ORDER#2024-01-15#order-456', type: 'order', amount: 299.99, status: 'pending', ttl: Math.floor(Date.now() / 1000) + 86400 * 90, }, ConditionExpression: 'attribute_not_exists(PK)', })); // Query all orders for a user const { Items } = await client.send(new QueryCommand({ TableName: 'AppTable', KeyConditionExpression: 'PK = :pk AND begins_with(SK, :prefix)', ExpressionAttributeValues: { ':pk': 'USER#user-123', ':prefix': 'ORDER#' }, }));