https://github.com/signiant/dynamodb-add-ttl-lambda

Lambda function to add a ttl attribute to an existing table based on an existing attribute
https://github.com/signiant/dynamodb-add-ttl-lambda

aws dynamodb ttl

Last synced: 7 months ago
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Lambda function to add a ttl attribute to an existing table based on an existing attribute

• Host: GitHub
• URL: https://github.com/signiant/dynamodb-add-ttl-lambda
• Owner: Signiant
• License: mit
• Created: 2017-11-03T11:28:59.000Z (over 8 years ago)
• Default Branch: main
• Last Pushed: 2025-07-25T20:06:10.000Z (9 months ago)
• Last Synced: 2025-10-13T16:09:04.510Z (7 months ago)
• Topics: aws, dynamodb, ttl
• Language: Python
• Size: 13.7 KB
• Stars: 1
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# dynamodb-add-ttl-lambda

Lambda function to add a ttl attribute to an existing table based on an existing attribute

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# Purpose

This lambda function is designed to be used as a DynamoDB trigger in order to add a ttl attribute to an existing table for new rows.  It will base the new ttl attribute on an existing timestamp attibute by reading the existing attribute and adding a number of days to it.  The existing attribute, number of days and new ttl attribute name are all configurable

# Installing

The easiest deployment of this solution is using AWS SAM

* export your AWS credentials (or use --profile option with sam commands)

* update the samconfig.toml file

  * stack_name - name for the CFN stack

  * region - if other than us-east-1

  * parameter overrides

    * ttlReferenceAttribute - existing attribute used to calculate TTL

    * timeToLive - duration of TTL (in days)

    * ttlAttributeName - what to name the TTL (e.g. ttl)

    * tableName - the DynamoDB table to watch

    * streamARN - the ARN of the DynamoDB stream for the table above

* deploy the lambda using SAM: `./utils/deploy.sh default`

This should deploy the lambda and set up the associated dynamodb trigger for the appropriate table.

NOTE: As per the StartingPosition property on the DynamoDB event trigger - this lambda will only process NEW records.

You may need a separate process to backfill existing records.

You can then monitor the stats for the function and the cloudwatch log to ensure TTLs are being added correctly for new rows.