Minio/Flask: payload from `unlinked` very large

[cklamann]

As the number of files in Minio grows, the number of results in the unlinked payload is getting very large and in some cases timing out. We'll need to think of a way to load the results in chunks using some kind of server-side filtering.

[hannahle]

There are a couple potential solutions:

1. If the user knows the name of the linked file a priori (perhaps by checking Minio or receiving it from someone else), we can perform a validator query versus a full search for all potential buckets and files from Minio.
2. Use webhooks to post a new record to the database a file is created (and remove when destroyed) -- then we just query the db using regular fuzzy searches and pagination

I've emailed Hannah Driver so we get more data points on her day-to-day use to choose the appropriate solution.