[PM 30100][Server] Subscription Discount Database Infrastructure (#6936)

* Implement the detail Subscription Discount Database Infrastructure

* Change string to string list

* fix lint error

* Create all missing database object definition files

* Regenerate EF migrations with Designer files

The previous migrations were missing .Designer.cs files. This commit:
- Removes the incomplete migration files
- Regenerates all three provider migrations (MySQL, Postgres, SQLite) with proper Designer files
- Updates DatabaseContextModelSnapshot.cs for each provider

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix failing database

* Resolve the lint  warnings

* Resolve the database failure

* Fix the build Lint

* resolve the dbops reviews

* Add the default value

---------

Co-authored-by: Claude <noreply@anthropic.com>

util/Migrator/DbScripts/2026-01-27_00_AddSubscriptionDiscountTable.sql

@@ -0,0 +1,200 @@
+-- Table
+IF OBJECT_ID('[dbo].[SubscriptionDiscount]') IS NULL
+BEGIN
+    CREATE TABLE [dbo].[SubscriptionDiscount] (
+        [Id] UNIQUEIDENTIFIER NOT NULL,
+        [StripeCouponId] VARCHAR(50) NOT NULL,
+        [StripeProductIds] NVARCHAR(MAX) NULL,
+        [PercentOff] DECIMAL(5,2) NULL,
+        [AmountOff] BIGINT NULL,
+        [Currency] VARCHAR(10) NULL,
+        [Duration] VARCHAR(20) NOT NULL,
+        [DurationInMonths] INT NULL,
+        [Name] NVARCHAR(100) NULL,
+        [StartDate] DATETIME2(7) NOT NULL,
+        [EndDate] DATETIME2(7) NOT NULL,
+        [AudienceType] INT NOT NULL CONSTRAINT [DF_SubscriptionDiscount_AudienceType] DEFAULT (0),
+        [CreationDate] DATETIME2(7) NOT NULL,
+        [RevisionDate] DATETIME2(7) NOT NULL,
+        CONSTRAINT [PK_SubscriptionDiscount] PRIMARY KEY CLUSTERED ([Id] ASC),
+        CONSTRAINT [IX_SubscriptionDiscount_StripeCouponId] UNIQUE ([StripeCouponId])
+    );
+END
+GO
+
+-- Index for date range queries
+IF NOT EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_SubscriptionDiscount_DateRange' AND object_id = OBJECT_ID('[dbo].[SubscriptionDiscount]'))
+BEGIN
+    CREATE INDEX [IX_SubscriptionDiscount_DateRange] ON [dbo].[SubscriptionDiscount]
+        ([StartDate], [EndDate]);
+END
+GO
+
+-- View
+CREATE OR ALTER VIEW [dbo].[SubscriptionDiscountView]
+AS
+SELECT *
+FROM
+    [dbo].[SubscriptionDiscount]
+GO
+
+-- Stored Procedures: Create
+CREATE OR ALTER PROCEDURE [dbo].[SubscriptionDiscount_Create]
+    @Id UNIQUEIDENTIFIER OUTPUT,
+    @StripeCouponId VARCHAR(50),
+    @StripeProductIds NVARCHAR(MAX),
+    @PercentOff DECIMAL(5,2),
+    @AmountOff BIGINT,
+    @Currency VARCHAR(10),
+    @Duration VARCHAR(20),
+    @DurationInMonths INT,
+    @Name NVARCHAR(100),
+    @StartDate DATETIME2(7),
+    @EndDate DATETIME2(7),
+    @AudienceType INT,
+    @CreationDate DATETIME2(7),
+    @RevisionDate DATETIME2(7)
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    INSERT INTO [dbo].[SubscriptionDiscount]
+    (
+        [Id],
+        [StripeCouponId],
+        [StripeProductIds],
+        [PercentOff],
+        [AmountOff],
+        [Currency],
+        [Duration],
+        [DurationInMonths],
+        [Name],
+        [StartDate],
+        [EndDate],
+        [AudienceType],
+        [CreationDate],
+        [RevisionDate]
+    )
+    VALUES
+    (
+        @Id,
+        @StripeCouponId,
+        @StripeProductIds,
+        @PercentOff,
+        @AmountOff,
+        @Currency,
+        @Duration,
+        @DurationInMonths,
+        @Name,
+        @StartDate,
+        @EndDate,
+        @AudienceType,
+        @CreationDate,
+        @RevisionDate
+    )
+END
+GO
+
+-- Stored Procedures: DeleteById
+CREATE OR ALTER PROCEDURE [dbo].[SubscriptionDiscount_DeleteById]
+    @Id UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    DELETE
+    FROM
+        [dbo].[SubscriptionDiscount]
+    WHERE
+        [Id] = @Id
+END
+GO
+
+-- Stored Procedures: ReadById
+CREATE OR ALTER PROCEDURE [dbo].[SubscriptionDiscount_ReadById]
+    @Id UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    SELECT
+        *
+    FROM
+        [dbo].[SubscriptionDiscountView]
+    WHERE
+        [Id] = @Id
+END
+GO
+
+-- Stored Procedures: Update
+CREATE OR ALTER PROCEDURE [dbo].[SubscriptionDiscount_Update]
+    @Id UNIQUEIDENTIFIER OUTPUT,
+    @StripeCouponId VARCHAR(50),
+    @StripeProductIds NVARCHAR(MAX),
+    @PercentOff DECIMAL(5,2),
+    @AmountOff BIGINT,
+    @Currency VARCHAR(10),
+    @Duration VARCHAR(20),
+    @DurationInMonths INT,
+    @Name NVARCHAR(100),
+    @StartDate DATETIME2(7),
+    @EndDate DATETIME2(7),
+    @AudienceType INT,
+    @CreationDate DATETIME2(7),
+    @RevisionDate DATETIME2(7)
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    UPDATE
+        [dbo].[SubscriptionDiscount]
+    SET
+        [StripeCouponId] = @StripeCouponId,
+        [StripeProductIds] = @StripeProductIds,
+        [PercentOff] = @PercentOff,
+        [AmountOff] = @AmountOff,
+        [Currency] = @Currency,
+        [Duration] = @Duration,
+        [DurationInMonths] = @DurationInMonths,
+        [Name] = @Name,
+        [StartDate] = @StartDate,
+        [EndDate] = @EndDate,
+        [AudienceType] = @AudienceType,
+        [CreationDate] = @CreationDate,
+        [RevisionDate] = @RevisionDate
+    WHERE
+        [Id] = @Id
+END
+GO
+
+-- Stored Procedures: ReadActive (returns discounts within date range)
+CREATE OR ALTER PROCEDURE [dbo].[SubscriptionDiscount_ReadActive]
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    SELECT
+        *
+    FROM
+        [dbo].[SubscriptionDiscountView]
+    WHERE
+        [StartDate] <= GETUTCDATE()
+        AND [EndDate] >= GETUTCDATE()
+END
+GO
+
+-- Stored Procedures: ReadByStripeCouponId
+CREATE OR ALTER PROCEDURE [dbo].[SubscriptionDiscount_ReadByStripeCouponId]
+    @StripeCouponId VARCHAR(50)
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    SELECT
+        *
+    FROM
+        [dbo].[SubscriptionDiscountView]
+    WHERE
+        [StripeCouponId] = @StripeCouponId
+END
+GO