Added updated_at info in review for allowing edits

db/final_db.sql

@@ -379,6 +379,7 @@ CREATE TABLE reviews (
     seller_rating INT CHECK (seller_rating >= 1 AND seller_rating <= 5),
     comment TEXT,
     created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW(),
     UNIQUE(listing_id, reviewer_id)
 );