My team and I are working on a Full-Stack Application using ReactJS on the frontend and AWS Amplify on the backend. We are using AWS AppSync to Query data in our DynamoDB tables (through GraphQL Queries), Cognito for User Authentication, and SES to send out emails to users. Basically, the user inputs some info (DynamoDB Table #1), and that is matched against an opportunity database (DynamoDB table #2), and the top 3 opportunities are shown to the user. If none are found, an email is sent to inform the user that they will receive an email when opportunities are found. Now for the Question: I wanted to know if there is a way to automatically Query a DynamoDB table (Like once a day or every time a new opportunity is added to the DynamoDB Table #2) and send out emails with matching opportunities to users who were waiting for them? I tried using Lambda Triggers but the only way I could do it was by querying each row of DynamoDB Table #1 against DynamoDB Table #2. That is computationally infeasible as there will be too many resources being used up. I am asking for advice on how I can go about making that daily check because I haven't been able to figure it out yet! Any responses are appreciated, and let me know if you need any additional information from my side! Thank you!
Automated DynamoDB Database Checks | ReactJS + AWS Amplify
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You could look into using DynamoDB Streams. When a new Opportunity is added to DynamoDB, the stream would trigger a lambda to be called. Your lambda could then execute your business logic to match the opportunity with the appropriate user.