remove arch from version record in favor of join table

src/Database/Queries.hs

@@ -284,6 +284,5 @@ upsertPackageVersion PackageManifest{..} = do
                 iconType
                 packageManifestReleaseNotes
                 packageManifestEosVersion
-                Nothing
     _res <- try @_ @SomeException $ insertKey pkgId (PkgRecord now (Just now))
     repsert (VersionRecordKey pkgId packageManifestVersion) ins

src/Model.hs

@@ -60,7 +60,6 @@ VersionRecord sql=version
     iconType Text
     releaseNotes Text
     osVersion Version
-    arch Text Maybe
     Primary pkgId number
     deriving Eq
     deriving Show