diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index e969f39..301b8f7 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -12,7 +12,8 @@
       "Bash(node debug-search.js:*)",
       "Bash(node update-referent.js:*)",
       "Bash(node:*)",
-      "Bash(curl:*)"
+      "Bash(curl:*)",
+      "Bash(npx tsc:*)"
     ],
     "deny": [],
     "ask": []
diff --git a/components/dashboard/usage-analytics.tsx b/components/dashboard/usage-analytics.tsx
index 9aa8daf..87b5f20 100644
--- a/components/dashboard/usage-analytics.tsx
+++ b/components/dashboard/usage-analytics.tsx
@@ -37,7 +37,7 @@ export function UsageAnalytics() {
 
   const { data: users = [] } = useCollection<LibreChatUser>("users", { limit: 1000 });
   const { data: conversations = [] } = useCollection<LibreChatConversation>("conversations", { limit: 1000 });
-  const { data: transactions = [] } = useCollection<LibreChatTransaction>("transactions", { limit: 1000 });
+  const { data: transactions = [] } = useCollection<LibreChatTransaction>("transactions", { limit: 10000 });
   const { data: balances = [] } = useCollection<LibreChatBalance>("balances", { limit: 1000 });
 
   const calculateStats = useCallback(() => {
@@ -56,7 +56,7 @@ export function UsageAnalytics() {
     // Analyser les doublons dans les balances
     const userCounts = new Map<string, number>();
     balances.forEach((balance) => {
-      const userId = balance.user;
+      const userId = String(balance.user);
       userCounts.set(userId, (userCounts.get(userId) || 0) + 1);
     });
 
@@ -77,7 +77,7 @@ export function UsageAnalytics() {
     const duplicateDetails = Array.from(userCounts.entries())
       .filter(([, count]) => count > 1)
       .map(([userId, count]) => {
-        const userBalances = balances.filter(b => b.user === userId);
+        const userBalances = balances.filter(b => String(b.user) === userId);
         const totalCredits = userBalances.reduce((sum, b) => sum + (b.tokenCredits || 0), 0);
         return {
           userId,
@@ -96,7 +96,7 @@ export function UsageAnalytics() {
     // NOUVEAU : Identifier les utilisateurs fantômes
     console.log("=== ANALYSE DES UTILISATEURS FANTÔMES ===");
     const userIds = new Set(users.map(user => user._id));
-    const balanceUserIds = balances.map(balance => balance.user);
+    const balanceUserIds = balances.map(balance => String(balance.user));
     const phantomUsers = balanceUserIds.filter(userId => !userIds.has(userId));
     const uniquePhantomUsers = [...new Set(phantomUsers)];
     
@@ -105,7 +105,7 @@ export function UsageAnalytics() {
     
     // Calculer les crédits des utilisateurs fantômes
     const phantomCredits = balances
-      .filter(balance => uniquePhantomUsers.includes(balance.user))
+      .filter(balance => uniquePhantomUsers.includes(String(balance.user)))
       .reduce((sum, balance) => sum + (balance.tokenCredits || 0), 0);
     
     console.log("Crédits des utilisateurs fantômes:", phantomCredits);
@@ -113,7 +113,7 @@ export function UsageAnalytics() {
     
     // Analyser les utilisateurs fantômes
     const phantomDetails = uniquePhantomUsers.map(userId => {
-      const userBalances = balances.filter(b => b.user === userId);
+      const userBalances = balances.filter(b => String(b.user) === userId);
       const totalCredits = userBalances.reduce((sum, b) => sum + (b.tokenCredits || 0), 0);
       return { userId, totalCredits, count: userBalances.length };
     });
@@ -134,13 +134,13 @@ export function UsageAnalytics() {
     // Grouper les balances par utilisateur
     const balancesByUser = new Map<string, LibreChatBalance[]>();
     balances.forEach((balance) => {
-      const userId = balance.user;
+      const balanceUserId = String(balance.user);
       // Ignorer les utilisateurs fantômes (qui n'existent plus)
-      if (users.some(user => user._id === userId)) {
-        if (!balancesByUser.has(userId)) {
-          balancesByUser.set(userId, []);
+      if (users.some(user => user._id === balanceUserId)) {
+        if (!balancesByUser.has(balanceUserId)) {
+          balancesByUser.set(balanceUserId, []);
         }
-        balancesByUser.get(userId)!.push(balance);
+        balancesByUser.get(balanceUserId)!.push(balance);
       }
     });
 
@@ -186,17 +186,19 @@ export function UsageAnalytics() {
     });
 
     // Calculer les conversations par utilisateur
+    // conv.user est un STRING
     conversations.forEach((conv) => {
-      const userStat = userStats.get(conv.user);
+      const userStat = userStats.get(String(conv.user));
       if (userStat) {
         userStat.conversations++;
       }
     });
 
     // Calculer les tokens par utilisateur depuis les transactions
+    // transaction.user est un ObjectId, on le convertit en string
     let totalTokensConsumed = 0;
     transactions.forEach((transaction) => {
-      const userStat = userStats.get(transaction.user);
+      const userStat = userStats.get(String(transaction.user));
       if (userStat && transaction.rawAmount) {
         const tokens = Math.abs(Number(transaction.rawAmount) || 0);
         userStat.tokens += tokens;
diff --git a/debug-analytics.js b/debug-analytics.js
new file mode 100644
index 0000000..fa26521
--- /dev/null
+++ b/debug-analytics.js
@@ -0,0 +1,27 @@
+const { MongoClient } = require('mongodb');
+
+async function debug() {
+  const uri = 'mongodb://7qV5rRanD6UwANNO:NK1EFfaKpJZcTQlmm7pDUUI7Yk7yqxN6@51.254.197.189:27017/librechat?authSource=admin';
+  const client = new MongoClient(uri);
+  await client.connect();
+  const db = client.db('librechat');
+
+  // Vérifier les types
+  const user = await db.collection('users').findOne({});
+  const tx = await db.collection('transactions').findOne({});
+  const conv = await db.collection('conversations').findOne({});
+
+  console.log('=== TYPES DES IDs ===');
+  console.log('user._id:', typeof user._id, '->', user._id);
+  console.log('transaction.user:', typeof tx.user, '->', tx.user);
+  console.log('conversation.user:', typeof conv.user, '->', conv.user);
+
+  console.log('\n=== COMPARAISONS ===');
+  console.log('user._id === tx.user:', user._id === tx.user);
+  console.log('String(user._id) === String(tx.user):', String(user._id) === String(tx.user));
+  console.log('user._id.toString() === conv.user:', user._id.toString() === conv.user);
+
+  await client.close();
+}
+
+debug().catch(console.error);