[Koha-bugs] [Bug 20254] New: Forbid the download of duplicate EDI messages

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20254

            Bug ID: 20254
           Summary: Forbid the download of duplicate EDI messages
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Acquisitions
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: colin.campbell at ptfs-europe.com
        QA Contact: testopia at bugs.koha-community.org

In theory EDI messages should be downloaded only once, as we rename it
according to Edifact conventions as soon as downloaded. However the case has
occured when after an issue with a vendor's server duplicates of the days files
have been uploaded to the download directory. 
As a result duplicate quotes are downloaded, creating new orders on the system,
as Koha cannot now rename the file (it would entail overwriting a file on the
vendor's system) this can continue infinitely.

So do not allow duplicate filenames to be downloaded, add a unique constraint
to edifact_messages to support this

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