Utilize DynamoDB transactions for writing event data, with internal team notifications configured within the transaction settings.

Direct the application to publish messages to four distinct Amazon SNS topics, with each team subscribing to a specific topic.

Activate DynamoDB Streams on the table and configure a trigger to send updates to a single Amazon SNS topic subscribed by all teams.

Implement a cron job that scans for new flagged items in the table every minute and notifies an Amazon SQS queue subscribed by the teams.