Revert "UniStore: Add folder to the SQL backend" (#95966)

Revert "UniStore: Add folder to the SQL backend (#95671)"

This reverts commit f075662696.

pkg/storage/unified/resource/server.go

@@ -49,27 +49,10 @@ type ListIterator interface {
 	// Used for fast(er) authz filtering
 	Name() string
 
-	// Folder of the current item
-	// Used for fast(er) authz filtering
-	Folder() string
-
 	// Value for the current item
 	Value() []byte
 }
 
-type BackendReadResponse struct {
-	// Metadata
-	Key    *ResourceKey
-	Folder string
-
-	// The new resource version
-	ResourceVersion int64
-	// The properties
-	Value []byte
-	// Error details
-	Error *ErrorResult
-}
-
 // The StorageBackend is an internal abstraction that supports interacting with
 // the underlying raw storage medium.  This interface is never exposed directly,
 // it is provided by concrete instances that actually write values.
@@ -80,7 +63,7 @@ type StorageBackend interface {
 	WriteEvent(context.Context, WriteEvent) (int64, error)
 
 	// Read a resource from storage optionally at an explicit version
-	ReadResource(context.Context, *ReadRequest) *BackendReadResponse
+	ReadResource(context.Context, *ReadRequest) *ReadResponse
 
 	// When the ResourceServer executes a List request, this iterator will
 	// query the backend for potential results.  All results will be
@@ -555,11 +538,7 @@ func (s *server) Read(ctx context.Context, req *ReadRequest) (*ReadResponse, err
 
 	rsp := s.backend.ReadResource(ctx, req)
 	// TODO, check folder permissions etc
-	return &ReadResponse{
-		ResourceVersion: rsp.ResourceVersion,
-		Value:           rsp.Value,
-		Error:           rsp.Error,
-	}, nil
+	return rsp, nil
 }
 
 func (s *server) List(ctx context.Context, req *ListRequest) (*ListResponse, error) {