Test if dolt could be used to store a Mastodon project

[maarzt]

part of mastodon-sc/mastodon-git#12

Issue mastodon-sc/mastodon-git#21 describes a format that allows to store a mastodon project in a git compatible format. The way mastodon internally represents a model graph with its spots and links is very similar to a relational database. Basically issue mastodon-sc/mastodon-git#21 describes how these tables could be serialized in a git friendly manner.

Maybe serializing tables in a git friendly manner is not necessary. DOLT promises to be a combination of git and a SQL database, so it's very promising as backend for versioning mastodon projects.

Advantages using DOLT

• No specialized format to serialize Mastodon in a git friendly format
• Dolt blame capabilities are exactly what we need
• DOLT allows to use file systems and google cloud storage to be used as a remote.

Disadvantages using DOLT

• Not as famous / stable / common as git.
• Research labs don't have a dolthub account. It costs 50$.
• I don't expect research institutes to run doltlab.

Tests needed

• Does the file system remote work?
• Is it possible to use the TUD file server as a remote.
• Can the file system remote handle concurrent access
  Let two clients push changes to a single cell in a dolt table concurrently.
• Can we serialize / deserialize a ModelGraph to / from dolt.
• Does dolt diff, dolt blame produce useful output?