Respond to CR.

SignalServiceKit/src/Storage/OWSStorage.m

@@ -257,7 +257,9 @@ static NSString *keychainDBPassAccount = @"TSDatabasePass";
             OWSProdCritical([OWSAnalyticsEvents storageErrorCouldNotLoadDatabase]);
 
             // Try to reset app by deleting all databases.
-            [OWSStorage deleteDatabaseFiles];
+            //
+            // TODO: Possibly clean up all app files.
+            //            [OWSStorage deleteDatabaseFiles];
 
             if (![self tryToLoadDatabase]) {
                 OWSProdCritical([OWSAnalyticsEvents storageErrorCouldNotLoadDatabaseSecondAttempt]);

SignalServiceKit/src/Storage/TSStorageManager.m

@@ -26,8 +26,8 @@ NSString *const TSStorageManagerExceptionName_CouldNotCreateDatabaseDirectory
 
 @interface TSStorageManager ()
 
-@property (nonatomic, readonly) YapDatabaseConnection *dbReadConnection;
-@property (nonatomic, readonly) YapDatabaseConnection *dbReadWriteConnection;
+@property (nonatomic, readonly, nullable) YapDatabaseConnection *dbReadConnection;
+@property (nonatomic, readonly, nullable) YapDatabaseConnection *dbReadWriteConnection;
 
 @property (atomic) BOOL areAsyncRegistrationsComplete;
 @property (atomic) BOOL areSyncRegistrationsComplete;