diff --git a/src/server.ts b/src/server.ts
index 8455382..b157965 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -91,12 +91,17 @@ export class WebhookServer {
 						}
 					}
 					const lastSyncMetric = Metrics.get('last_sync_ok');
-					let last_sync_ok: number | null = typeof lastSyncMetric === 'number' ? lastSyncMetric : null;
-					// Fallback: si no hay métrica, inferir a partir de la presencia de last_verified en grupos
-					if (last_sync_ok === null) {
-						last_sync_ok = lv ? 1 : 0;
+					const maxAgeRaw = Number(process.env.MAX_MEMBERS_SNAPSHOT_AGE_MS);
+					const maxAgeMs = Number.isFinite(maxAgeRaw) && maxAgeRaw > 0 ? maxAgeRaw : 24 * 60 * 60 * 1000;
+					const snapshot_fresh = typeof snapshot_age_ms === 'number' ? (snapshot_age_ms <= maxAgeMs) : false;
+					let last_sync_ok: number;
+					if (typeof lastSyncMetric === 'number') {
+						last_sync_ok = (lastSyncMetric === 1 && snapshot_fresh) ? 1 : 0;
+					} else {
+						// Si no hay métrica explícita, nos basamos exclusivamente en la frescura de la snapshot
+						last_sync_ok = snapshot_fresh ? 1 : 0;
 					}
-					const payload = { status: 'ok', active_groups, active_members, last_sync_at, snapshot_age_ms, last_sync_ok };
+					const payload = { status: 'ok', active_groups, active_members, last_sync_at, snapshot_age_ms, snapshot_fresh, last_sync_ok };
 					return new Response(JSON.stringify(payload), {
 						status: 200,
 						headers: { 'Content-Type': 'application/json' }