Missing index

Hi Experts

I am confused  with the missing index suggestion by sql server. please see the table script bellow

CREATE TABLE [dbo].[tblNotifications](
	[NotificationID] [uniqueidentifier] NOT NULL,
	[ApplicationID] [varchar](255) NOT NULL,
	[NotificationTypeID] [int] NOT NULL,
	[DateOfNotification] [datetime] NOT NULL,
	[NotificationMessage] [varchar](max) NOT NULL,
	[Processed] [bit] NOT NULL,
	[ProcessedDate] [datetime] NULL,
	[id] [int] IDENTITY(1,1) NOT NULL,
 CONSTRAINT [PK_tblNotifications] PRIMARY KEY NONCLUSTERED 
(
	[NotificationID] ASC
) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]



CREATE UNIQUE CLUSTERED INDEX [IX_tblNotifications] ON [dbo].[tblNotifications]
(
	[id] ASC
) ON [PRIMARY]

CREATE NONCLUSTERED INDEX [_dta_index_tblNotifications_27_738101670__K4_K7_1_2_3_5_9987] ON [dbo].[tblNotifications]
(
	[DateOfNotification] ASC,
	[ProcessedDate] ASC
)
INCLUDE ( 	[NotificationID],
	[ApplicationID],
	[NotificationTypeID],
	[NotificationMessage])  ON [PRIMARY]

CREATE NONCLUSTERED INDEX [ix_tblNotifications_ProcessedDate] ON [dbo].[tblNotifications]
(
	[ProcessedDate] ASC
) ON [PRIMARY]




ALTER TABLE [dbo].[tblNotifications] ADD  CONSTRAINT [DF_tblNotifications_ApplicationID]  DEFAULT ((-1)) FOR [ApplicationID]

ALTER TABLE [dbo].[tblNotifications] ADD  CONSTRAINT [DF_tblNotifications_NotificationTypeID]  DEFAULT ((-1)) FOR [NotificationTypeID]

ALTER TABLE [dbo].[tblNotifications] ADD  CONSTRAINT [DF_tblNotifications_NotificationMessage]  DEFAULT ((-1)) FOR [NotificationMessage]

ALTER TABLE [dbo].[tblNotifications] ADD  CONSTRAINT [DF_tblNotifications_Processed]  DEFAULT ((0)) FOR [Processed]

ALTER TABLE [dbo].[tblNotifications]  WITH CHECK ADD  CONSTRAINT [FK_tblNotifications_tblApplicationIds] FOREIGN KEY([ApplicationID])
REFERENCES [dbo].[tblApplicationIds] ([ApplicationID])

ALTER TABLE [dbo].[tblNotifications] CHECK CONSTRAINT [FK_tblNotifications_tblApplicationIds]

ALTER TABLE [dbo].[tblNotifications]  WITH CHECK ADD  CONSTRAINT [FK_tblNotifications_tblNotificationTypes] FOREIGN KEY([NotificationTypeID])
REFERENCES [dbo].[tblNotificationTypes] ([NotificationTypeID])

ALTER TABLE [dbo].[tblNotifications] CHECK CONSTRAINT [FK_tblNotifications_tblNotificationTypes]

Execution plan

SQL is asking to create an index on processedDate column, which already has an index on the column. Another thing I am noticing is the difference between actual and estimated row count.  i have  executed updated  stats with fullscan option on all those table still seeing any difference. 

any idea..

regards

VVT

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