Table: Schedule_Item_Date_Index
This table is an index used for fast queries looking up the [Schedule_Item] rows that intersect with a date range.
Columns
Name	Type	Constraints	Description
schedule_item_KEY	int	NOT NULL
lower_date_utc	datetime	NOT NULL
upper_date_utc	datetime	NOT NULL
is_all_day_event	bit	NOT NULL

Primary key
Name	Columns		Description
PK_Schedule_Item_Date_Index$schedule_item_KEY$lower_date_utc	schedule_item_KEY, lower_date_utc		CLUSTERED
Indexes
Name	Columns		Description
IX_Schedule_Item_Date_Index$lower_date_utc@is_all_day_event@schedule_item_KEY@upper_date_utc	lower_date_utc, is_all_day_event, schedule_item_KEY, upper_date_utc		This is the primary index used to look up records by lower_date_utc and must cover the other columns.

Foreign keys
Name	Columns	Referenced table	Description
FK_Schedule_Item_Date_Index__Schedule_Item__schedule_item_KEY	schedule_item_KEY	Schedule_Item	on delete cascade;