Actually migrate to new persistent store locations

Tusker/CoreData/MastodonCachePersistentStore.swift

@@ -54,6 +54,31 @@ class MastodonCachePersistentStore: NSPersistentContainer {
             persistentStoreDescriptions = [storeDescription]
         } else {
             super.init(name: "\(accountInfo!.persistenceKey)_cache", managedObjectModel: MastodonCachePersistentStore.managedObjectModel)
+            
+            // workaround for migrating from using id in name to persistenceKey
+            // can be removed after a sufficient time has passed
+            if accountInfo!.id.contains("/") {
+                for desc in persistentStoreDescriptions {
+                    guard let new = desc.url else {
+                        continue
+                    }
+                    for ext in ["sqlite", "sqlite-shm", "sqlite-wal"] {
+                        var old = new.deletingLastPathComponent()
+                        let components = accountInfo!.id.split(separator: "/")
+                        for dir in components.dropLast(1) {
+                            old.appendPathComponent(String(dir), isDirectory: true)
+                        }
+                        old.appendPathComponent("\(components.last!)_cache", isDirectory: false)
+                        old.appendPathExtension(ext)
+                        if FileManager.default.fileExists(atPath: old.path) {
+                            var expected = new.deletingLastPathComponent()
+                            expected.appendPathComponent("\(accountInfo!.persistenceKey)_cache", isDirectory: false)
+                            expected.appendPathExtension(ext)
+                            try? FileManager.default.moveItem(at: old, to: expected)
+                        }
+                    }
+                }
+            }
         }
         
         loadPersistentStores { (description, error) in