update docs

web-server/database/05_documents.sql

@@ -0,0 +1,67 @@
+USE [RobotInstaller];
+GO
+
+SET ANSI_NULLS ON;
+SET QUOTED_IDENTIFIER ON;
+GO
+
+IF OBJECT_ID(N'dbo.Documents', N'U') IS NULL
+BEGIN
+    CREATE TABLE dbo.Documents
+    (
+        Id UNIQUEIDENTIFIER NOT NULL
+            CONSTRAINT PK_Documents PRIMARY KEY CLUSTERED
+            CONSTRAINT DF_Documents_Id DEFAULT NEWSEQUENTIALID(),
+        Title NVARCHAR(200) NOT NULL,
+        Category NVARCHAR(50) NOT NULL
+            CONSTRAINT DF_Documents_Category DEFAULT N'other',
+        Summary NVARCHAR(1000) NULL,
+        Content NVARCHAR(MAX) NULL,
+        FilePath NVARCHAR(1000) NULL,
+        OriginalFileName NVARCHAR(260) NULL,
+        MimeType NVARCHAR(200) NULL,
+        FileSizeBytes BIGINT NULL,
+        CreatedByUserId UNIQUEIDENTIFIER NOT NULL,
+        CreatedAt DATETIME2(3) NOT NULL
+            CONSTRAINT DF_Documents_CreatedAt DEFAULT SYSUTCDATETIME(),
+        UpdatedAt DATETIME2(3) NULL,
+        CONSTRAINT FK_Documents_CreatedByUser
+            FOREIGN KEY (CreatedByUserId) REFERENCES dbo.Users(Id),
+        CONSTRAINT CK_Documents_Title_NotBlank CHECK (LEN(LTRIM(RTRIM(Title))) > 0),
+        CONSTRAINT CK_Documents_Category CHECK (
+            Category IN (N'introduction', N'guide', N'user-guide', N'technical', N'policy', N'other')
+        ),
+        CONSTRAINT CK_Documents_FileSizeBytes CHECK (FileSizeBytes IS NULL OR FileSizeBytes >= 0),
+        CONSTRAINT CK_Documents_HasReadableContent CHECK (
+            NULLIF(LTRIM(RTRIM(Content)), N'') IS NOT NULL OR FilePath IS NOT NULL
+        )
+    );
+END;
+GO
+
+IF NOT EXISTS (
+    SELECT 1
+    FROM sys.indexes
+    WHERE name = N'IX_Documents_Category_UpdatedAt'
+      AND object_id = OBJECT_ID(N'dbo.Documents')
+)
+BEGIN
+    CREATE INDEX IX_Documents_Category_UpdatedAt
+    ON dbo.Documents(Category, UpdatedAt DESC, CreatedAt DESC);
+END;
+GO
+
+IF NOT EXISTS (
+    SELECT 1
+    FROM sys.indexes
+    WHERE name = N'IX_Documents_CreatedByUserId'
+      AND object_id = OBJECT_ID(N'dbo.Documents')
+)
+BEGIN
+    CREATE INDEX IX_Documents_CreatedByUserId
+    ON dbo.Documents(CreatedByUserId);
+END;
+GO
+
+PRINT N'RobotInstaller documents schema is ready.';
+GO