append-only

We should create an integration test that splits up a big file or it performs an expected mathematical operations on generating records, in a way that the output can be inferred and checked.

e.g.:

• splits up a 100MB video file into several 1MB files, sends to the commit log, re-assemble the file and checks md5 of the original and the re-assembled.
• create a series of events that have rando

Found through review of dwyl/phoenix-ecto-append-only-log-example#11

Link currently points to https://github.com/dwyl/phoenix-ecto-append-only-log-example/pull/2/files#diff-db55bfd345510f8bbb29d36daadf7061R21, which at the time was part of a PR.

Should we now update this to https://github.com/dwyl/phoenix-ecto-append-only-log-example/blob/3eb130e103cef05ef57e5d1fcd2

conversions to and from text and integers seems to be adding a noticeable performance hit.

Use ReadWriteCloser for WAL or implement separate abstraction.