Dolt is Git for Data: a SQL database that you can fork, clone, branch, merge

It's amazing this isn't a standard feature. The database world seems to have focused on large, high volume, globally distributed databases. Presumably you would't version clickstream or IoT sensor data.

Features like this that are only feasible below a certain scale are underdeveloped and I think there's opportunity there.

Datomic has some sort of zero-cost forming of the database: it’s “add-only” design makes this cheap.

Every DB engine used at scale has a concept of snapshots and backups. This just looks like someone making a git-like porcelain for the same kind of DB management constructs.

Isnt the mysql log journal* what you are looking for?

* I dont remember the exact name but I refer the feature that is used to replicate actions if there was an error.

It's not just snapshots though.

Dolt actually stores the tables, rows, and commits in a Merkle DAG, like Git. So you get branch and merge. You can't do branch and merge with snapshots.

(You also get the full git / github toolbox: push and pull, fork and clone, rebase, and most other git commands)

Yeah it's a neat idea but I struggle to think of good use-cases for merge, other than toy datasets. If I'm working on a service that's sharding millions of users across dozens of DB instances a merge is going to be incomprehensible to understand and reason about conflicts.

No. Relational DB logs are kept for short time, and do not allow for branching/merging. And even if you would store full log since day 1, the only way to check state of database at some point would be to start from scratch and reply everything to desired point. For any sizeable db, that's not practical.

> Yeah it's a neat idea but I struggle to think of good use-cases [...] If I'm working on a service [...]

I suspect that's simply not the use-case they're targeting. You're thinking of a database as simply the persistence component for your service, a means to an end. For you, the service/app/software is the thing you're trying to deliver. Where this looks useful is the cases where the data itself is the thing you're trying to deliver.