Openfoodnetwork: Calculating customer balance

[sauloperez]

What is the problem we are solving

This aims to solve the regression experienced in v3.3.1. While we are at it, we also want to ensure balances are consistently calculated across various areas of the app.

This started in https://github.com/openfoodfoundation/openfoodnetwork/pull/6366.

Success factors = expected outcome

Hubs and individual users should be able to check balances in a reasonable time-span. We currently heard about hubs not being able to access /admin/customers because it takes forever to load.

We should greatly reduce p90 of the involved endpoints (some more than others).

[RachL]

From our chat with @sauloperez today here is the release / roll-out plan for this work:

• Next release (February 23rd): the last bit of dev work is released and activated for FR
• March 2nd : all instances get their toggl switch on. Meaning the new code is available everywhere and we can switch off easily if we've missed a bug.
• If no issues, we remove the toggle and the old code completely with the release scheduled for March 16th. It means 2 weeks to properly check balances.

How does that sound @openfoodfoundation/train-drivers-product-owners ?

[jaycmb]

Sounds good to me!

[RachL]

As talked through in delivery circle this morning: we are closing this epic! The remaining PR is not linked to customer balances.

What @sauloperez must be doing behind his screen:

Well done :)

[sauloperez]

Absolutely @RachL !