Looks between the given date and loop over X-days and combine multiple CSV files in one. The format of files should be something like:

• Billing_account-2017-06-02.csv

Both functions are have a few fields to be send:

• Days (optional): By default will take 30 days
• Date (optional): It takes today date if none is passed. Format: YYYY-MM-DD
• BucketName (Mandatory): Bucket Name
• Prefix (Mandatory): Name of the file we're looking of without date. Ex: billing_account-

1. combineFiles Combine multiple csv files from bucket using bucket.combine(), make it public and stream the content.
2. appendFilesV2 Combine on stream multiple CSV without concatening the headers.