[jessaustin]

I wonder if "bucket notifications" are reliable enough that one could keep such an index DB populated automatically?

[nolite]

Yes, just hook those up to a lambda function and write to dynamodb or something

[otterley]

I tried this, but if you want to query by tags, using an RDS database works much better. DynamoDB is not well suited to this particular problem.

[lobster_johnson]

I think SQS would be reliable enough here, yes.