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Today, this question was migrated from the main site to Database Administrators. Before migration, it had two comments; one simple one about being better suited, and a more elaborate one which happened to link to a specific answer on dba.se. (I've included screenshots for those < 10K in case it gets deleted on the source site.)

comments on question BEFORE migration


When the question was migrated, only the top comment remained (which I promptly deleted):

comments on question AFTER migration


I'm pretty sure this is not how this is supposed to work. Either only the first should have been deleted, or at worst, they both should have been deleted. But I don't know exactly what the algorithm is or how these auto-delete decisions are made. In this case, it back-fired - deleting a useful (IMHO) comment, and leaving behind the redundant one.

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  • 1
    Probably because the actual comment uses [dba.se], which the check might not look for since it's not actually a link in the comment body. – animuson Jan 13 '14 at 21:26
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    This is what happened: First comment was provided as This question would be better suited for [dba.se], which was auto-formatted to read This question would be better suited for [Database Administrators](http://dba.stackexchange.com). The second comment uses an explicit dba.stackexchange.com address, which caused the deletion. Bad heuristic indeed, since some constructive comments should remain across migration (for example, suggested duplicates/related posts). – Werner Jan 13 '14 at 21:27
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    Ok, thanks folks, however I still think this isn't functioning correctly. I am fully aware of the intended functionality, why and how it is supposed to work, etc. but I think (1) the deletion script should detect the shorthand versions of URLs too, and (2) it should not detect full URLs with additional specifics. IMHO. – Aaron Bertrand Jan 13 '14 at 21:29
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This is what happened:

  1. First comment was provided as

    This question would be better suited for [dba.se]
    

    which was auto-formatted to read

    This question would be better suited for
    [Database Administrators](http://dba.stackexchange.com)
    
  2. The second comment uses an explicit dba.stackexchange.com address, which caused the deletion (implicit site suggestions that match the target are also deleted).

Indeed a bad heuristic, since some constructive comments should remain across migration, IMO (for example, suggested duplicates/related posts on the target site).

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