New pattern submission - lambda-ddb-tenant-isolation-terraform

[archiev4]

To submit a template to the Serverless Patterns Collection, submit an issue with the following information.

IMPORTANT
Patterns are intended to be primarily IaC-focused implementations of 2-4 AWS services, with minimum custom code. They should be commonly used combinations that help developers get started quickly. If you have a utility, demo, or application, submit these to the Serverless Repos Collection instead.

ONLY SUBMIT ONE PATTERN CHANGE PER PR. Multiple patterns or files spanning multiple pattern directories will be automatically rejected.

Patterns may take up to 4-6 weeks to review, test, and merge but there is no SLA and can take significantly longer due to other work the team has.

To learn more about submitting a pattern, read the publishing guidelines page.

1. Use the model template located at https://github.com/aws-samples/serverless-patterns/tree/main/_pattern-model to set up a README, template and any associated code.

2. THIS PROCESS HAS BEEN SIMPLIFIED. All the information below must be provided in the "example-pattern.json" file cloned from the model **

Note the following information for the model:

• Description (intro.text) should be a 300-500 word explanation of how the pattern works.
  This pattern implements a serverless multi-tenant API using Amazon API Gateway, AWS Lambda and Amazon DynamoDB to demonstrate tenant isolation. This solution works by exposing two API Gateway endpoints, /standard and /isolated, each backed by a separate Lambda function. When a request hits the /standard endpoint, the Lambda function increments a single shared counter row in DynamoDB, meaning all tenants read and write the same value. When a request hits the /isolated endpoint with an x-tenant-id header, API Gateway maps the header to the Lambda execution context, ensuring a dedicated execution environment per tenant, and the Lambda function increments a tenant-specific counter row in DynamoDB, keeping each tenant's data completely separate.

• Resources should like to AWS documentation and AWS blogs related to the post (1-5 maximum).
  https://docs.aws.amazon.com/lambda/latest/dg/tenant-isolation.html
  https://aws.amazon.com/about-aws/whats-new/2025/11/aws-lambda-tenant-isolation-mode/
  Framework : Terraform
  Language : Python 3.14

• Author bio may include a LinkedIn and/or Twitter reference and a 1-sentence bio.
  Name: Archana V
  Bio: Solutions Architect at AWS
  LinkedIN: https://www.linkedin.com/in/archanavenkat/

You must ensure that the sections of the model README.md are completed in full.

GitHub PR for template:

#2964