You’re welcome, I’m very happy it finally worked ! 
For information, I opened a Git issue : https://gitlab.e.foundation/e/backlog/-/issues/2399
It contains a proposal for a new solution, if accepted I could help you with applying it to your /e/ Cloud instance.
Meanwhile, please free to open some other threads about, for example, managing, monitoring, securing, …
You may want to start with something I think as an absolute must-have : [HOWTO] Properly backup self-hosted /e/ cloud databases
Welcome to your own /e/ Cloud 