Comment by postexitus

18 days ago

Soft deletes in banking are just a Band-Aid to the much bigger problem of auditability. You may keep the original record by soft deleting it, but if you don't take care of amends, you will still lose auditability. The correct way is to use EventSourcing, with each change to an otherwise immutable state being recorded as an Event, including a Delete (both of an Event and the Object). This is even more problematic from a performance sense, but Syncs and Snapshots are for that exact purpose - or you can back the main table with a separate events table, with periodic "reconstruct"s.

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postexitus

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infamia  18 days ago

> The correct way is to use EventSourcing, with each change to an otherwise immutable state being recorded as an Event, including a Delete (both of an Event and the Object).

Another great (and older) approach is adding temporal information do your traditional database, which gives immutability without the eventual consistency headaches that normally comes with event sourcing. Temporal SQL has their own set of challenges of course, but you get to keep 30+ years of relational DB tooling which is a boon. Event sourcing is great, but we shouldn't forget about other tools in our toolbelt as well!

  • postexitus  17 days ago

    I am using Temporal tables in SQL Server right now - I agree it's a bit of best of both worlds; but they are also painful to manage. I believe there could be a better solution without sacrificing SQL tools.

taeric  18 days ago

Isn't this, essentially, backing into double-entry accounting for all things banking? Which, fair, it makes sense.