You absolutely want swap. It is super cheap insurance. Even if you never use it, it’s easily worth the minor cost in disk space.
Unless, of course, you enjoy processes being randomly terminated when you go exactly one byte over the total system memory at any given time…
You can re-run discourse-setup, but it’s fragile, so if you changed it by hand, it’s possible to make a change that will break it. I suspect that in this case it would have created the swap and set the memory parameters just fine.
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