Hi there, great mod so far!
We have a save file where we used your mod. But we currently have a problem loading this save file in 2.1. In Factorio 2.0 we used version 1.4.0 of your mod and wanted to switch to 1.7.1 running on Factorio 2.1.
If we load the save file the migration states following removal of entities:

legendary-storage-tank (storage-tank)

We could rebuilt them (791 legendary storage tanks) by hand or could modify the save file or add a migration script in the mod by ourselfs, but we are not familiar with the modding api that it would take som time for us.
Would be cool if you could add a migration in the mod to smooth the change to the factorio vanilla storage tank scaling.

Thanks in advance!

Are you only using vanilla storage tanks, or also modded versions?
If it's just vanilla, a simple json migration should work, but for other mods, I'd need to manually add every single storage tank name to the file...

1.7.2 has a migration script for the simplest case (only vanilla storage-tank in either vanilla qualities, or the most popular mod-added qualities (if I correctly guessed their internal names)). For everything else (infinite/less popular additional quality mods, and importantly all non-vanilla storage tanks), I had started working on a command you could run in 2.0 to 2.1-proof your save file - once that's finalized and uploaded, switching to 2.1 or even disabling settings during a save should become much less hazardous even in heavily modded scenarios.

Hey, it's just vanilla storage tanks. Tried 1.7.2 and worked, Thanks for the fast reply!

Glad it helped!