Add support for synchronizing microdescriptors from another instance
cf. comments 30+ in #18910 (moved)
microdescs are stored according to the referencing microcons valid after time, which cannot be inferred from the microdescriptor itself.
cf. comments 30+ in #18910 (moved)
microdescs are stored according to the referencing microcons valid after time, which cannot be inferred from the microdescriptor itself.