feat: add permission check

migrations/20240727123308_initial.sql

@@ -210,6 +210,22 @@ CREATE TABLE IF NOT EXISTS participant_task
     penalty        INT     NOT NULL
 );
 
+
+
+
+CREATE TABLE IF NOT EXISTS users
+(
+    user_id    INT         NOT NULL,
+    role       INT         NOT NULL,
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+
+    CHECK ( role BETWEEN 0 AND 3),
+    PRIMARY KEY (user_id)
+);
+
+
+
+
 CREATE FUNCTION on_new_participant() RETURNS TRIGGER AS 
 $$ BEGIN
     --RAISE NOTICE 'NEW.ID:%, NEW.contest_id:%', NEW.id,NEW.contest_id;
@@ -272,6 +288,7 @@ $$;
 CREATE TRIGGER languages_upd_trg BEFORE UPDATE ON languages FOR EACH ROW EXECUTE FUNCTION updated_at_update();
 CREATE TRIGGER problems_upd_trg BEFORE UPDATE ON problems FOR EACH ROW EXECUTE FUNCTION updated_at_update();
 CREATE TRIGGER contests_upd_trg BEFORE UPDATE ON contests FOR EACH ROW EXECUTE FUNCTION updated_at_update();
+CREATE TRIGGER users_upd_trg BEFORE UPDATE ON users FOR EACH ROW EXECUTE FUNCTION updated_at_update();
 -- +goose StatementEnd
 
 -- +goose Down
@@ -295,4 +312,5 @@ DROP TABLE IF EXISTS subtasks CASCADE;
 DROP TABLE IF EXISTS participants CASCADE;
 DROP TABLE IF EXISTS participant_task CASCADE;
 DROP TABLE IF EXISTS participant_subtask CASCADE;
+DROP TABLE IF EXISTS users CASCADE;
 -- +goose StatementEnd