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

web/backend/Database/Database.Migrations/scripts/01-schema/03-UserAvatar.sql

@@ -0,0 +1,29 @@
+CREATE TABLE UserAvatar -- delete avatar photo when user account is deleted
+(
+    UserAvatarID UNIQUEIDENTIFIER
+        CONSTRAINT DF_UserAvatarID DEFAULT NEWID(),
+
+    UserAccountID UNIQUEIDENTIFIER NOT NULL,
+
+    PhotoID UNIQUEIDENTIFIER NOT NULL,
+
+    RowVersion ROWVERSION,
+
+    CONSTRAINT PK_UserAvatar PRIMARY KEY (UserAvatarID),
+
+    CONSTRAINT FK_UserAvatar_UserAccount
+        FOREIGN KEY (UserAccountID)
+            REFERENCES UserAccount (UserAccountID)
+            ON DELETE CASCADE,
+
+    CONSTRAINT FK_UserAvatar_PhotoID
+        FOREIGN KEY (PhotoID)
+            REFERENCES Photo (PhotoID),
+
+    CONSTRAINT AK_UserAvatar_UserAccountID
+        UNIQUE (UserAccountID)
+);
+
+CREATE
+NONCLUSTERED INDEX IX_UserAvatar_UserAccount
+    ON UserAvatar(UserAccountID);