Use an EC2 Spot Instance to process .csv files hourly, generating images uploaded to S3.

Implement a Lambda function for .csv to image conversion, triggered by new .csv uploads to S3.

Set S3 Lifecycle rules to transition .csv files to Glacier after one day, and expire images after 30 days.

Set S3 Lifecycle rules to transition .csv files to One Zone-IA after one day, expiring images after 30 days.

Set S3 Lifecycle rules to transition .csv files to Standard-IA after one day, using RRS for image files.