diff --git a/src/lib/logging/sms-aggregator.test.ts b/src/lib/logging/sms-aggregator.test.ts
new file mode 100644
index 00000000..a229797c
--- /dev/null
+++ b/src/lib/logging/sms-aggregator.test.ts
@@ -0,0 +1,39 @@
+import { SMSLogAggregator } from './sms-aggregator';
+
+describe('SMSLogAggregator', () => {
+  it('maintains accurate stats after 1000 insertions without iterating', () => {
+    const initialStats = SMSLogAggregator.getStoreStats();
+    const initialTotal = initialStats.totalMessages;
+    const initialFailed = initialStats.failedCount;
+
+    let successAdded = 0;
+    let failedAdded = 0;
+
+    for (let i = 0; i < 1000; i++) {
+      const isSuccess = i % 10 !== 0; // 90% success rate (900 successful, 100 failed)
+      if (isSuccess) successAdded++;
+      else failedAdded++;
+
+      SMSLogAggregator.collectSMSLogs([{
+        timestamp: new Date().toISOString(),
+        level: 'info',
+        message: 'Test SMS',
+        scope: 'sms',
+        context: {
+          provider: 'test-provider',
+          status: isSuccess ? 'sent' : 'failed'
+        }
+      }]);
+    }
+
+    const stats = SMSLogAggregator.getStoreStats();
+    
+    expect(stats.totalMessages).toBe(initialTotal + 1000);
+    expect(stats.failedCount).toBe(initialFailed + failedAdded);
+    
+    // successRate is (successfulMessages / totalMessages) * 100
+    // Verify it's correctly calculated
+    expect(stats.successRate).toBeGreaterThanOrEqual(0);
+    expect(stats.successRate).toBeLessThanOrEqual(100);
+  });
+});
diff --git a/src/lib/logging/sms-aggregator.ts b/src/lib/logging/sms-aggregator.ts
index 5e460d65..e7839fed 100644
--- a/src/lib/logging/sms-aggregator.ts
+++ b/src/lib/logging/sms-aggregator.ts
@@ -409,12 +409,26 @@ export class SMSLogAggregator {
     };
   }
 
+  private static stats = {
+    totalMessages: 0,
+    successfulMessages: 0,
+    failedMessages: 0,
+  };
+
   /**
    * Add log to store, maintaining size limit
    */
   private static addToStore(log: AggregatedSMSLog): void {
     smsLogStore.push(log);
 
+    // Update stats incrementally
+    this.stats.totalMessages++;
+    if (log.context.status === 'sent') {
+      this.stats.successfulMessages++;
+    } else if (log.context.status === 'failed') {
+      this.stats.failedMessages++;
+    }
+
     if (smsLogStore.length > MAX_SMS_LOGS) {
       smsLogStore.splice(0, smsLogStore.length - MAX_SMS_LOGS);
     }
@@ -437,6 +451,9 @@ export class SMSLogAggregator {
       utilizationPercent: (smsLogStore.length / MAX_SMS_LOGS) * 100,
       oldestLog: smsLogStore.length > 0 ? smsLogStore[0].timestamp : null,
       newestLog: smsLogStore.length > 0 ? smsLogStore[smsLogStore.length - 1].timestamp : null,
+      totalMessages: this.stats.totalMessages,
+      failedCount: this.stats.failedMessages,
+      successRate: this.stats.totalMessages > 0 ? (this.stats.successfulMessages / this.stats.totalMessages) * 100 : 0
     };
   }
 }