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srowen avatar srowen commented on July 16, 2024

Do you mean merge IDs? That's a common need, yeah, though it ends up being hard to implement. The model doesn't know about the individual users' data, so can't really delete the old data and add the new data.

The batch layer would have this data and could be told to merge IDs. It can't rewrite old data, but could retain some rewrite rules.

Then it becomes necessary to define some channel outside the normal data path to supply these mappings and maintain them. And there are questions about how that data gets updated from the API, and how it's aged, and how multiple remapping are supported.

Because of the moderate complexity, I have historically said it's up to the app layer to manage this. If user X merges with Y, then leave old user X (it will age out eventually) and post all of X's data to Y, or as much as you know.

I'm open to better ideas.

from oryx.

cimox avatar cimox commented on July 16, 2024

Yes. I mean merge IDs.

Make perfectly sense everything you wrote there. I thought initially it will be easy to implement. Now I am thinking it will be easier to remember some lookup table in application layer and do it the way you described as posting all X's data to Y.

from oryx.

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