-- Create Table
IF OBJECT_ID(N'[dbo].[Prj_T_TaskDependency]', N'U') IS NULL
BEGIN
    CREATE TABLE [dbo].[Prj_T_TaskDependency] (
        [Id]                   UNIQUEIDENTIFIER NOT NULL CONSTRAINT [PK_Prj_T_TaskDependency] PRIMARY KEY,
        [TenantId]             UNIQUEIDENTIFIER NULL,
        [TaskId]               UNIQUEIDENTIFIER NOT NULL,
        [DependsOnTaskId]      UNIQUEIDENTIFIER NOT NULL,
        [Note]                 NVARCHAR(300)    NULL,
        [CreationTime]         DATETIME2        NOT NULL CONSTRAINT [DF_Prj_T_TaskDependency_CreationTime] DEFAULT (GETUTCDATE()),
        [CreatorId]            UNIQUEIDENTIFIER NULL,
        [LastModificationTime] DATETIME2        NULL,
        [LastModifierId]       UNIQUEIDENTIFIER NULL,
        [IsDeleted]            BIT              NOT NULL CONSTRAINT [DF_Prj_T_TaskDependency_IsDeleted] DEFAULT (0),
        [DeletionTime]         DATETIME2        NULL,
        [DeleterId]            UNIQUEIDENTIFIER NULL
    );
END
GO

IF NOT EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = N'FK_Prj_T_TaskDependency_Task')
    ALTER TABLE [dbo].[Prj_T_TaskDependency] ADD CONSTRAINT [FK_Prj_T_TaskDependency_Task]
        FOREIGN KEY ([TaskId]) REFERENCES [dbo].[Prj_T_Task] ([Id]);
GO

IF NOT EXISTS (SELECT 1 FROM sys.foreign_keys WHERE name = N'FK_Prj_T_TaskDependency_DependsOnTask')
    ALTER TABLE [dbo].[Prj_T_TaskDependency] ADD CONSTRAINT [FK_Prj_T_TaskDependency_DependsOnTask]
        FOREIGN KEY ([DependsOnTaskId]) REFERENCES [dbo].[Prj_T_Task] ([Id]);
GO

IF NOT EXISTS (SELECT 1 FROM sys.indexes WHERE name = N'IX_Prj_T_TaskDependency_TaskId' AND object_id = OBJECT_ID(N'[dbo].[Prj_T_TaskDependency]'))
    CREATE INDEX [IX_Prj_T_TaskDependency_TaskId] ON [dbo].[Prj_T_TaskDependency] ([TaskId] ASC);
GO