Table: Project_Extension
Columns
Name	Type	Constraints	Description
project_extension_KEY	int	NOT NULL	AUTO-INCREMENT: Database assigned primary key for this table.
update__staff_KEY	int	NOT NULL
project_KEY	int	NOT NULL	Key to a Project record.
extension_number	int	NOT NULL	Number of this extension (unique per project_KEY). Extension 0 is the original due date.
due_date	smalldatetime	NOT NULL	Current due date of this extension.
row_version	timestamp	NOT NULL
original_due_date	smalldatetime	NOT NULL	The original due date of the project extension; readonly once the record is created.
create__changeset_KEY	int	NOT NULL
update__changeset_KEY	int	NOT NULL

Primary key
Name	Columns		Description
PK_Project_Extension$project_extension_KEY	project_extension_KEY		CLUSTERED
Unique constraints
Name	Columns		Description
UK_Project_Extension$project_KEY$extension_number	project_KEY, extension_number

Foreign keys
Name	Columns	Referenced table	Description
FK_Project_Extension__Project__project_KEY	project_KEY	Project	on delete cascade;