diff --git a/dbConfig/index.js b/dbConfig/index.js
index 7462c7b..44131f9 100644
--- a/dbConfig/index.js
+++ b/dbConfig/index.js
@@ -44,8 +44,7 @@ const initDB = async () => {
             short_code TEXT NOT NULL,
             expiry_date TEXT,
             user_id TEXT DEFAULT '',
-            customized_shortner_slug TEXT,
-            UNIQUE(user_id, customized_shortner_slug)
+            customized_shortner_slug TEXT
           )`,
           function (err) {
             if (err) {
@@ -58,19 +57,21 @@ const initDB = async () => {
                   CREATE TRIGGER IF NOT EXISTS enforce_custom_slug_uniqueness_insert
                   BEFORE INSERT ON urls
                   BEGIN
-                    -- Prevent duplicate slugs for anonymous users
+                    -- Case 1: Anonymous users with non-empty slug must be globally unique
                     SELECT RAISE(ABORT, 'Slug must be unique for anonymous users')
-                    WHERE NEW.user_id = '' AND NEW.customized_shortner_slug != '' AND EXISTS (
-                      SELECT 1 FROM urls
-                      WHERE user_id = '' AND customized_shortner_slug = NEW.customized_shortner_slug
-                    );
+                    WHERE NEW.user_id = '' AND NEW.customized_shortner_slug != ''
+                      AND EXISTS (
+                        SELECT 1 FROM urls
+                        WHERE user_id = '' AND customized_shortner_slug = NEW.customized_shortner_slug
+                      );
 
-                    -- Prevent duplicate slugs for the same logged-in user
+                    -- Case 2: Logged-in users with non-empty slug must be unique per user
                     SELECT RAISE(ABORT, 'Slug must be unique per user')
-                    WHERE NEW.user_id != '' AND NEW.customized_shortner_slug != '' AND EXISTS (
-                      SELECT 1 FROM urls
-                      WHERE user_id = NEW.user_id AND customized_shortner_slug = NEW.customized_shortner_slug
-                    );
+                    WHERE NEW.user_id != '' AND NEW.customized_shortner_slug != ''
+                      AND EXISTS (
+                        SELECT 1 FROM urls
+                        WHERE user_id = NEW.user_id AND customized_shortner_slug = NEW.customized_shortner_slug
+                      );
                   END;
                 `,
                 function (err) {