An efficient domain model

[alensiljak]

Brainstorming what an efficient domain model might be. I'll list a few options that need to be compared. Any input is valuable.

1. Store entities in Vectors and keep index references in fields. I.e. All Accounts are in a Vector and Posts store indices in Post: :Accounts (Vec) field.

2. Keep the nested tree. I.e. A Transaction keeps instances in Vec field.

What is the performance of constantly fetching entities from big arrays vs a smaller nested ones?
The operations on lists (Posts, Accounts) are simpler with typed lists.

An additional option would be database storage (#22). This trims the data that needs to be retrieved/parsed but also opens up a question of the data format, persistence, etc.

[alensiljak]

A great overview with examples is available here:
https://eli.thegreenplace.net/2021/rust-data-structures-with-circular-references/