When requesting previews, which we don't find in oc_previews, search in
IAppData first before creating them.
Move the logic from MovepreviewJob to PreviewMigrationService and reuse
that in the Preview Generator.
At the same time rename MovePreviewJob to PreviewMigrationJob as it is a
better name.
Signed-off-by: Carl Schwan <carl.schwan@nextcloud.com>
And move it to a different table so that we don't have to pay the
storage cost when not using it (most of the times).
Signed-off-by: Carl Schwan <carl.schwan@nextcloud.com>
* Simplify migration by not moving the actual files and just updating
the DB
* Don't store the storageid in the preview table as it is not needed
* Start adding tests
Signed-off-by: Carl Schwan <carl.schwan@nextcloud.com>
