diff --git a/bin/scripts/add_indexes.js b/bin/scripts/add_indexes.js
index af9c59eb24f..f257f0ef0ee 100644
--- a/bin/scripts/add_indexes.js
+++ b/bin/scripts/add_indexes.js
@@ -29,8 +29,6 @@ pluginManager.dbConnection().then((countlyDb) => {
                 () => countlyDb.collection('app_users' + app._id).ensureIndex({"tsd": 1}, { background: true }, cb),
                 () => countlyDb.collection('app_users' + app._id).ensureIndex({"did": 1}, { background: true }, cb),
                 () => countlyDb.collection('app_users' + app._id).dropIndex("lac_1_ls_1", cb),
-                () => countlyDb.collection('app_user_merges' + app._id).ensureIndex({cd: 1}, {expireAfterSeconds: 60 * 60 * 3, background: true}, cb),
-                () => countlyDb.collection('metric_changes' + app._id).ensureIndex({ts: -1}, { background: true }, cb),
                 () => countlyDb.collection('metric_changes' + app._id).ensureIndex({ts: 1, "cc.o": 1}, { background: true }, cb),
                 () => countlyDb.collection('metric_changes' + app._id).ensureIndex({uid: 1}, { background: true }, cb)
             ];
diff --git a/bin/scripts/data-cleanup/delete_old_drill_events.js b/bin/scripts/data-cleanup/delete_old_drill_events.js
new file mode 100644
index 00000000000..78f66efde24
--- /dev/null
+++ b/bin/scripts/data-cleanup/delete_old_drill_events.js
@@ -0,0 +1,66 @@
+/**
+ * MongoDB script to delete all collections from a database
+ * that start with "drill_events" string, but excluding the exact "drill_events" collection
+ * 
+ * 
+ * Server: MongoDB
+ * Path: any
+ * Command: mongosh -u uname -p 'password' --authenticationDatabase admin delete_old_drill_events.js
+ */
+
+/* global db, print, quit */
+
+// Set the database name
+const dbName = "countly_drill";
+
+// Set to true for dry run, false to actually delete collections
+const dryRun = true;
+
+print(`Using database: ${dbName}`);
+var cly = db;
+// If we need to switch to a different database
+if (db.getName() !== dbName) {
+    cly = db.getSiblingDB(dbName);
+}
+
+console.log(`Operating on database: ${dbName}`);
+
+// Get all collection names that start with "drill_events" but are not exactly "drill_events"
+const collections = cly.getCollectionInfos().map(info => info.name).filter(collName =>
+    collName.startsWith("drill_events") && collName !== "drill_events"
+);
+
+// Print the collections that will be deleted
+print("Collections to be deleted:");
+collections.forEach(collName => print(`- ${collName}`));
+
+// Ask for confirmation
+if (collections.length === 0) {
+    print("No matching collections found to delete.");
+    quit();
+}
+
+print(`\nFound ${collections.length} collections to delete.`);
+
+
+if (dryRun) {
+    print("Dry run mode is enabled. No collections will be deleted.");
+    print("To proceed with deletion, set 'dryRun' to false in the script.");
+    quit();
+}
+
+// Delete each collection
+let deletedCount = 0;
+collections.forEach(collName => {
+    try {
+        cly[collName].drop();
+        print(`Dropped collection: ${collName}`);
+        deletedCount++;
+    }
+    catch (error) {
+        print(`Error dropping collection ${collName}: ${error}`);
+    }
+});
+
+// Print summary
+print(`\nOperation completed. Deleted ${deletedCount} out of ${collections.length} collections.`);
\ No newline at end of file
diff --git a/bin/scripts/sharding/sharding.js b/bin/scripts/sharding/sharding.js
index 9ed8bcb9cd8..6635ce2207d 100644
--- a/bin/scripts/sharding/sharding.js
+++ b/bin/scripts/sharding/sharding.js
@@ -2,13 +2,17 @@
 *  Sharding Countly collections when DB requires authentication, provide it to authDB.auth command in the code
 *  Server: mongodb
 *  Path: any
-*  Command: mongosh < sharding.js
+*  Command: mongosh -u uname -p 'password' --authenticationDatabase admin sharding.js
 */
 
-/* global Mongo, print, printjson */
-var COUNTLY_DRILL = 'countly_drill',
-    COUNTLY = 'countly',
-    COUNT_TO_SHARD = 100000;
+/* global db, print, printjson */
+
+// Set countly_drill database name
+const COUNTLY_DRILL = 'countly_drill';
+// Set countly database name
+const COUNTLY = 'countly';
+// Set the threshold for sharding collections
+const COUNT_TO_SHARD = 100000;
 
 var EXCEPTIONS = [
     /^system\./,
@@ -27,14 +31,8 @@ var COUNTLY_TO_SHARD = [
     "feedback",
 ];
 
-var conn = new Mongo(),
-    authDB = conn.getDB('admin');
-
-// need to update this info
-authDB.auth('<username>', '<password>');
-
-var cly = conn.getDB(COUNTLY),
-    drill = conn.getDB(COUNTLY_DRILL);
+var cly = db.getSiblingDB(COUNTLY),
+    drill = db.getSiblingDB(COUNTLY_DRILL);
 
 var clyCollections = cly.getCollectionNames(), collections = clyCollections.concat(drill.getCollectionNames()), check = [];
 
@@ -61,8 +59,7 @@ check.forEach(function(c) {
     var db = clyCollections.indexOf(c) === -1 ? drill : cly,
         dbName = clyCollections.indexOf(c) === -1 ? COUNTLY_DRILL : COUNTLY,
         count = db[c].count(),
-        capped = db[c].stats()['capped'],
-        status = db[c].getShardVersion().ok;
+        capped = db[c].stats()['capped'];
 
     COUNTLY_TO_SHARD.some((e) => {
         if (c.indexOf(e) == 0) {
@@ -71,7 +68,7 @@ check.forEach(function(c) {
         }
     });
 
-    if (!capped && count > COUNT_TO_SHARD && !status && !exceptional) {
+    if (!capped && count > COUNT_TO_SHARD && !exceptional) {
         print('Creating hashed index & enabling sharding for collection "' + c + '"... ');
 
         db.getCollection(c).createIndex({ _id: 'hashed' });