adds method to clear before loading

LeStorage/StoredCollection.swift

@@ -183,8 +183,12 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
         }
     }
     
-    /// Retrieves the data from the server and loads it into the items array
     public func loadDataFromServerIfAllowed() async throws {
+        try await self.loadDataFromServerIfAllowed(clear: false)
+    }
+    
+    /// Retrieves the data from the server and loads it into the items array
+    public func loadDataFromServerIfAllowed(clear: Bool = false) async throws {
         guard self.synchronized, !(self is StoredSingleton<T>) else {
             throw StoreError.cannotSyncCollection(name: self.resourceName)
         }
@@ -192,6 +196,9 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
             let items: [T] = try await self._store.getItems()
             if items.count > 0 {
                 DispatchQueue.main.async {
+                    if clear {
+                        self.clear()
+                    }
                     self._addOrUpdate(contentOfs: items, shouldSync: false)
                 }
             }