Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/TelegramCore/Sources/TelegramEngine/Data/ItemCacheData.swift

@@ -0,0 +1,29 @@
+import SwiftSignalKit
+import Postbox
+
+public extension TelegramEngine.EngineData.Item {
+    enum ItemCache {
+        public struct Item: TelegramEngineDataItem, PostboxViewDataItem {
+            public typealias Result = CodableEntry?
+
+            private let collectionId: Int8
+            private let id: ValueBoxKey
+
+            public init(collectionId: Int8, id: ValueBoxKey) {
+                self.collectionId = collectionId
+                self.id = id
+            }
+
+            var key: PostboxViewKey {
+                return .cachedItem(ItemCacheEntryId(collectionId: collectionId, key: self.id))
+            }
+
+            func extract(view: PostboxView) -> Result {
+                guard let view = view as? CachedItemView else {
+                    preconditionFailure()
+                }
+                return view.value
+            }
+        }
+    }
+}