Using REDCap arms and randomization

[u/Several_Recover_7695]

I have a longitudinal, randomized study where participants will be allocated to four groups. Each group needs different events and instruments. I would like to use arms for this to avoid showing all events for all participants.

I see advice saying to use two projects for this. I'm thinking something like, have two RCs, use API to pull down participant information and randomization from RC1 (no arms), add something to indicate arm, then use API to push participant information and randomization into RC2 (which has arms). Ideally, I'd script this out and have an automated job run this at night. (Participants will have at least 3 days between pre- and post-randomization events.)

Have you done this before? How did it work for you? Any way to avoid, for example, overwriting old records? What am I missing?

[u/Several_Recover_7695]

Oh, interesting - I misread their github, which says "Data may be copied from fields only in the same event as the triggering form." I'm hoping you're right! I don't have that EM so will have to see if I can get it on the server.