diff --git a/db/final_db.sql b/db/final_db.sql
index 23f5a36..dc7c08f 100644
--- a/db/final_db.sql
+++ b/db/final_db.sql
@@ -591,6 +591,22 @@ CREATE TRIGGER trg_update_conversation_call
 AFTER INSERT ON communication_records
 FOR EACH ROW EXECUTE FUNCTION update_conversation_latest();
 
+
+-- Trigger 4: Auto-Update Listing Status when Sold Info is added
+CREATE OR REPLACE FUNCTION update_listing_status_on_sold()
+RETURNS TRIGGER AS $$
+BEGIN
+    UPDATE listings
+    SET status = 'sold'
+    WHERE id = NEW.listing_id;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_update_listing_status_on_sold
+AFTER INSERT ON sold_information
+FOR EACH ROW EXECUTE FUNCTION update_listing_status_on_sold();
+
 -- ======================================================
 -- END OF SCRIPT
 -- ======================================================
\ No newline at end of file