diff --git a/LeStorage/Codables/Settings.swift b/LeStorage/Codables/Settings.swift
index 6b68ba4..cf35de2 100644
--- a/LeStorage/Codables/Settings.swift
+++ b/LeStorage/Codables/Settings.swift
@@ -16,6 +16,6 @@ class Settings: MicroStorable {
     var userId: String? = nil
     var username: String? = nil
     var deviceId: String? = nil
-    var lastSynchronization: Date? = nil
+    var lastSynchronization: Date = Date()
     
 }
diff --git a/LeStorage/Store.swift b/LeStorage/Store.swift
index 960fb93..91853ee 100644
--- a/LeStorage/Store.swift
+++ b/LeStorage/Store.swift
@@ -319,8 +319,9 @@ final public class Store {
     }
     
     /// Returns whether all collections have loaded locally
-    public func collectionsAllLoaded() -> Bool {
-        return self._collections.values.allSatisfy { $0.hasLoaded }
+    public func fileCollectionsAllLoaded() -> Bool {
+        let fileCollections = self._collections.values.filter { $0.inMemory == false }
+        return fileCollections.allSatisfy { $0.hasLoaded }
     }
     
 }
diff --git a/LeStorage/StoreCenter.swift b/LeStorage/StoreCenter.swift
index 4194f04..e979d55 100644
--- a/LeStorage/StoreCenter.swift
+++ b/LeStorage/StoreCenter.swift
@@ -195,7 +195,7 @@ public class StoreCenter {
         self._settingsStorage.update { settings in
             settings.username = nil
             settings.userId = nil
-            settings.lastSynchronization = nil
+            settings.lastSynchronization = Date()
             
             self._webSocketManager = nil
         }
@@ -413,22 +413,17 @@ public class StoreCenter {
 
     func synchronizeLastUpdates() async throws {
         
-        if let lastSync = self._settingsStorage.item.lastSynchronization {
-            
-            let syncGetCollection: ApiCallCollection<GetSyncData> = try self.apiCallCollection()
-            if await syncGetCollection.hasPendingCalls() {
-                await syncGetCollection.rescheduleApiCallsIfNecessary()
-            } else {
-                let getSyncData = GetSyncData()
-                getSyncData.lastUpdate = lastSync
-                try await syncGetCollection.sendGetRequest(instance: getSyncData)
-            }
+        let lastSync = self._settingsStorage.item.lastSynchronization
+        
+        let syncGetCollection: ApiCallCollection<GetSyncData> = try self.apiCallCollection()
+        if await syncGetCollection.hasPendingCalls() {
+            await syncGetCollection.rescheduleApiCallsIfNecessary()
         } else {
-            Logger.w("Can't sync due to missing saved date")
+            let getSyncData = GetSyncData()
+            getSyncData.lastUpdate = lastSync
+            try await syncGetCollection.sendGetRequest(instance: getSyncData)
         }
         
-//        let lastSync: Date? = self._settingsStorage.item.lastSynchronization
-//        try await self._services?.synchronizeLastUpdates(since: lastSync)
     }
 
     func userDataAccessRetrieved(_ data: Data) {
@@ -473,7 +468,7 @@ public class StoreCenter {
             }
 
             if let revocations = json["revocations"] as? [String: Any] {
-                try self._parseSyncRevocations(revocations, parents: json["revocation_parents"] as? [String: Any])
+                try self._parseSyncRevocations(revocations, parents: json["revocation_parents"] as? [[String: Any]])
             }
 
             if let dateString = json["date"] as? String,
@@ -538,7 +533,7 @@ public class StoreCenter {
         }
     }
 
-    fileprivate func _parseSyncRevocations(_ deletions: [String: Any], parents: [String: Any]?) throws {
+    fileprivate func _parseSyncRevocations(_ deletions: [String: Any], parents: [[String: Any]]?) throws {
         for (className, revocationData) in deletions {
             guard let revokedItems = revocationData as? [Any] else {
                 Logger.w("Invalid update data for \(className)")
@@ -556,22 +551,23 @@ public class StoreCenter {
         }
         
         if let parents {
-            for (className, parentData) in parents {
-                guard let parentItems = parentData as? [Any] else {
-                    Logger.w("Invalid update data for \(className): \(parentData)")
-                    continue
-                }
-                for parentItem in parentItems {
-                    do {
-                        let data = try JSONSerialization.data(withJSONObject: parentItem, options: [])
-                        let revokedObject = try JSON.decoder.decode(ObjectIdentifier.self, from: data)
-                        StoreCenter.main.synchronizationRevoke(id: revokedObject.modelId, model: className, storeId: revokedObject.storeId)
-                    } catch {
-                        Logger.error(error)
+            for level in parents {
+                for (className, parentData) in level {
+                    guard let parentItems = parentData as? [Any] else {
+                        Logger.w("Invalid update data for \(className): \(parentData)")
+                        continue
+                    }
+                    for parentItem in parentItems {
+                        do {
+                            let data = try JSONSerialization.data(withJSONObject: parentItem, options: [])
+                            let revokedObject = try JSON.decoder.decode(ObjectIdentifier.self, from: data)
+                            StoreCenter.main.synchronizationRevoke(id: revokedObject.modelId, model: className, storeId: revokedObject.storeId)
+                        } catch {
+                            Logger.error(error)
+                        }
                     }
                 }
             }
-
         }
     }
     
diff --git a/LeStorage/StoredCollection.swift b/LeStorage/StoredCollection.swift
index 2b6aed7..bf2f540 100644
--- a/LeStorage/StoredCollection.swift
+++ b/LeStorage/StoredCollection.swift
@@ -17,6 +17,7 @@ protocol CollectionHolder {
 protocol SomeCollection: CollectionHolder, Identifiable {
     var resourceName: String { get }
     var hasLoaded: Bool { get }
+    var inMemory: Bool { get }
 
     func allItems() -> [any Storable]
     func referenceCount<S: Storable>(type: S.Type, id: String) -> Int