Restore accidentally removed files, a few additional import/calculation fixes

inventory-server/dashboard/aircall-server/src/config/aircall.config.js

@@ -0,0 +1,15 @@
+export const aircallConfig = {
+  serviceName: 'aircall',
+  apiId: process.env.AIRCALL_API_ID,
+  apiToken: process.env.AIRCALL_API_TOKEN,
+  timezone: 'America/New_York',
+  dayStartsAt: 1,
+  storeHistory: true,
+  collection: 'aircall_daily_data',
+  redisTTL: 300, // 5 minutes cache for current day
+  endpoints: {
+    metrics: {
+      ttl: 300
+    }
+  }
+};