feat: ✨ let database handles creation times

migrations/20241204225135_create_user_table.up.sql

@@ -6,5 +6,6 @@ CREATE TABLE IF NOT EXISTS "user"(
     gender boolean NOT NULL,
     birth_date DATE NOT NULL,
     email VARCHAR(255) NOT NULL UNIQUE,
-    role_id BIGSERIAL NOT NULL REFERENCES "role"(id)
+    role_id BIGSERIAL NOT NULL REFERENCES "role"(id),
+    creation_time TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );