Laravel - BLOB File Management System - Possible obstacles?

I'm working on this weird project where I need to upload huge files (500mb+) and store them in a postgresql table as a blob.

Before you start telling me that storing files in the database is bad and that I should use the filesystem instead, hear (read) my reasons:

1. The access to the files must be authorized through the app, where individual permissions to them are applied.


2. I will need to keep an history (versioning) of each file, giving access to previous modifications.


3. I can't afford the risk of losing consistency between the relations and the files/versions over the course of the years.

Now, on to the questions:

1. Do I risk getting timeouts during upload/download or the download process counts as a 'keep-alive'?


2. Are the files completely loaded into memory for each user or are they buffered (streamed) to the user? I need to allow some thousands of users to download big files at the same time.


3. Are there any packages that can help me with this?