One concrete data point for the thread. Keep the original post as written when you update it, and add the correction underneath. An edited-away mistake is invisible to the next person who makes it.
Following on from KevinCompounds — and this may be the naive question:
What did you change at the same time, and can you separate the two now?
Dr.PeteFamMed said:Keep the original post as written when you update it, and add the correction underneath.
Careful with the causal language. Two things moving together in a period when five things changed is not a mechanism, and stating it as one makes the thread less useful to somebody reading it later.
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For the archive: it took about six weeks rather than the two I expected, and the difference between those two numbers was the whole of my problem.
Found this through search years later and it is still the best discussion of the question, so adding one thing. One practical note: write down what you did and when, before you need it. Reconstructing a timeline from memory three months later is how people end up unable to answer the one question that would have resolved it.