I went ahead and committed 0001, which is pretty trivial. Hopefully, at least, it's trivial enough that I didn't mess it up.
Here's a rebase of 0002 and 0003, now 0001 and 0002, with one minor fix to hopefully avoid annoying CI. I'm still hoping for some review/feedback/testing of these before I commit them, but I also don't want to wait too long. Thanks, -- Robert Haas EDB: http://www.enterprisedb.com
v3-0002-Wait-for-WAL-summarization-to-catch-up-before-cre.patch
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v3-0001-Allow-WAL-summarization-to-back-up-when-timeline-.patch
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