[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2521: magic-folder db schema changes

[Tahoe-LAFS]

#2521: magic-folder db schema changes
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     Reporter:  dawuud                      |      Owner:  dawuud
         Type:  defect                      |     Status:  new
     Priority:  normal                      |  Milestone:  undecided
    Component:  code-frontend-magic-folder  |    Version:  1.10.1
   Resolution:                              |   Keywords:  magic-folder db
Launchpad Bug:                              |  schema
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Comment (by daira):

 I think we want to preserve unknown fields in the metadata when a file is
 uploaded over an existing file. (Remember that different clients of a
 magic folder collective may be using different versions of Tahoe, and we
 probably don't want the metadata written by a later version to be lost in
 that case. Actually, the best option would be to write a
 "`magic_folder_schema_version`" field, so that it is possible to tell
 which fields were deliberately written and which were just preserved.)

 Nevertheless, LGTM, let's work on top of this commit.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2521#comment:3>
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