Refactor tutorial and user models to replace fileName with id, update related components and services for consistency

src/main/resources/db/migration/V10__refresh_token.sql

@@ -0,0 +1,12 @@
+CREATE TABLE IF NOT EXISTS public.refreshtoken
+(
+    id bigint NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 9223372036854775807 CACHE 1 ),
+    user_id bigint NOT NULL,
+    token character varying COLLATE pg_catalog."default" NOT NULL,
+    expiry_date timestamp with time zone,
+    CONSTRAINT refreshtoken_pkey PRIMARY KEY (id),
+    CONSTRAINT "FK_refreshtoken_users" FOREIGN KEY (user_id)
+        REFERENCES public.users (id) MATCH SIMPLE
+        ON UPDATE NO ACTION
+        ON DELETE NO ACTION
+);