feat: make group sync interval configurable via env var

.env.example

@@ -6,3 +6,7 @@ WHATSAPP_COMMUNITY_ID="example-community-id@g.us"
 CHATBOT_PHONE_NUMBER="1234567890"
 PORT="3007"
 WEBHOOK_URL="https://example-url.com/webhook"
+
+# Group sync interval in milliseconds (default: 24h)
+# Set lower during development (e.g. 60000 = 1 minute)
+# GROUP_SYNC_INTERVAL_MS=86400000

src/services/group-sync.ts

@@ -10,7 +10,18 @@ type EvolutionGroup = {
 };
 
 export class GroupSyncService {
-  private static readonly SYNC_INTERVAL_MS = 24 * 60 * 60 * 1000; // 24 hours
+  private static get SYNC_INTERVAL_MS(): number {
+    const interval = process.env.GROUP_SYNC_INTERVAL_MS
+      ? Number(process.env.GROUP_SYNC_INTERVAL_MS)
+      : 24 * 60 * 60 * 1000; // Default 24 hours
+    
+    // Ensure minimum 10 second interval in development
+    if (process.env.NODE_ENV === 'development' && interval < 10000) {
+      console.warn(`Sync interval too low (${interval}ms), using 10s minimum`);
+      return 10000;
+    }
+    return interval;
+  }
   private static lastSyncAttempt = 0;
 
   static async syncGroups(): Promise<{ added: number; updated: number }> {