Organise ddl statements into separate files per create table (#251)

web/backend/Database/Database.Migrations/scripts/01-schema/01-UserAccount.sql

@@ -0,0 +1,31 @@
+CREATE TABLE dbo.UserAccount
+(
+    UserAccountID UNIQUEIDENTIFIER
+        CONSTRAINT DF_UserAccountID DEFAULT NEWID(),
+
+    Username VARCHAR(64) NOT NULL,
+
+    FirstName NVARCHAR(128) NOT NULL,
+
+    LastName NVARCHAR(128) NOT NULL,
+
+    Email VARCHAR(128) NOT NULL,
+
+    CreatedAt DATETIME NOT NULL
+        CONSTRAINT DF_UserAccount_CreatedAt DEFAULT GETDATE(),
+
+    UpdatedAt DATETIME,
+
+    DateOfBirth DATE NOT NULL,
+
+    RowVersion ROWVERSION,
+
+    CONSTRAINT PK_UserAccount
+        PRIMARY KEY (UserAccountID),
+
+    CONSTRAINT AK_Username
+        UNIQUE (Username),
+
+    CONSTRAINT AK_Email
+        UNIQUE (Email)
+);