diff --git a/apps/decodex/src/orchestrator/operator_http.rs b/apps/decodex/src/orchestrator/operator_http.rs
index 2279b37..3705b14 100644
--- a/apps/decodex/src/orchestrator/operator_http.rs
+++ b/apps/decodex/src/orchestrator/operator_http.rs
@@ -12,6 +12,12 @@ const OPERATOR_DASHBOARD_LOGO_ICO: &[u8] =
 const OPERATOR_DASHBOARD_LOGO_TOUCH_PNG: &[u8] =
 	include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/src/orchestrator/assets/logo-touch.png"));
 const OPERATOR_HTTP_READ_TIMEOUT: Duration = Duration::from_millis(250);
+const DASHBOARD_RUN_ACTIVITY_FINGERPRINT_VOLATILE_FIELDS: &[&str] = &[
+	"idle_for_seconds",
+	"protocol_idle_for_seconds",
+	"current_elapsed_seconds",
+	"wall_seconds",
+];
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 enum OperatorRequestRoute {
@@ -534,16 +540,33 @@ fn build_operator_run_activity_event(
 		active_runs.extend(project_active_runs);
 	}
 
-	let fingerprint_payload = json!({
+	let fingerprint_payload = dashboard_run_activity_fingerprint_payload(
+		&account_control,
+		&accounts,
+		&active_runs,
+	);
+	let fingerprint = serde_json::to_vec(&fingerprint_payload)?;
+	let payload = json!({
+		"emittedAtUnixEpoch": now_unix_epoch,
 		"accountControl": &account_control,
 		"accounts": &accounts,
 		"activeRuns": &active_runs,
 		"activeRunsComplete": true,
 		"activeRunScope": "complete",
 	});
-	let fingerprint = serde_json::to_vec(&fingerprint_payload)?;
-	let payload = json!({
-		"emittedAtUnixEpoch": now_unix_epoch,
+
+	Ok(DashboardRunActivityEvent {
+		fingerprint,
+		event: DashboardBroadcastEvent { event_type: "runActivity", payload },
+	})
+}
+
+fn dashboard_run_activity_fingerprint_payload(
+	account_control: &OperatorCodexAccountControlStatus,
+	accounts: &[CodexAccountActivitySummary],
+	active_runs: &[OperatorRunStatus],
+) -> Value {
+	let mut fingerprint_payload = json!({
 		"accountControl": account_control,
 		"accounts": accounts,
 		"activeRuns": active_runs,
@@ -551,10 +574,28 @@ fn build_operator_run_activity_event(
 		"activeRunScope": "complete",
 	});
 
-	Ok(DashboardRunActivityEvent {
-		fingerprint,
-		event: DashboardBroadcastEvent { event_type: "runActivity", payload },
-	})
+	strip_dashboard_run_activity_volatile_fields(&mut fingerprint_payload);
+
+	fingerprint_payload
+}
+
+fn strip_dashboard_run_activity_volatile_fields(value: &mut Value) {
+	match value {
+		Value::Object(object) => {
+			for field in DASHBOARD_RUN_ACTIVITY_FINGERPRINT_VOLATILE_FIELDS {
+				object.remove(*field);
+			}
+			for child in object.values_mut() {
+				strip_dashboard_run_activity_volatile_fields(child);
+			}
+		},
+		Value::Array(values) => {
+			for child in values {
+				strip_dashboard_run_activity_volatile_fields(child);
+			}
+		},
+		_ => {},
+	}
 }
 
 fn dashboard_current_snapshot_event_payload(
diff --git a/apps/decodex/src/orchestrator/tests/operator/status/http.rs b/apps/decodex/src/orchestrator/tests/operator/status/http.rs
index 8abcb52..3c9b077 100644
--- a/apps/decodex/src/orchestrator/tests/operator/status/http.rs
+++ b/apps/decodex/src/orchestrator/tests/operator/status/http.rs
@@ -1071,6 +1071,90 @@ fn operator_dashboard_run_activity_event_summarizes_active_runs() {
 	assert_eq!(data["activeRuns"][0]["protocol_activity"]["waiting_reason"], "model");
 	assert_eq!(data["activeRuns"][0]["account"]["account_fingerprint"], "acct-1");
 	assert_eq!(data["activeRuns"][0]["accounts"][0]["account_fingerprint"], "acct-1");
+	assert!(data["activeRuns"][0].get("idle_for_seconds").is_some());
+	assert!(data["activeRuns"][0].get("protocol_idle_for_seconds").is_some());
+	assert!(fingerprint["activeRuns"][0].get("idle_for_seconds").is_none());
+	assert!(fingerprint["activeRuns"][0].get("protocol_idle_for_seconds").is_none());
+}
+
+#[test]
+fn operator_dashboard_run_activity_fingerprint_ignores_volatile_timing_fields() {
+	let mut first = serde_json::json!({
+		"accountControl": {
+			"mode": "balanced",
+			"account_selector": null,
+		},
+		"accounts": [],
+		"activeRuns": [
+			{
+				"run_id": "run-1",
+				"status": "running",
+				"phase": "executing",
+				"idle_for_seconds": 4,
+				"protocol_idle_for_seconds": 3,
+				"child_agent_activity": {
+					"current_bucket": "model",
+					"current_elapsed_seconds": 2,
+					"buckets": [
+						{
+							"bucket": "model",
+							"wall_seconds": 2,
+							"event_count": 7,
+						},
+					],
+				},
+			},
+		],
+		"activeRunsComplete": true,
+		"activeRunScope": "complete",
+	});
+	let mut second = serde_json::json!({
+		"accountControl": {
+			"mode": "balanced",
+			"account_selector": null,
+		},
+		"accounts": [],
+		"activeRuns": [
+			{
+				"run_id": "run-1",
+				"status": "running",
+				"phase": "executing",
+				"idle_for_seconds": 5,
+				"protocol_idle_for_seconds": 4,
+				"child_agent_activity": {
+					"current_bucket": "model",
+					"current_elapsed_seconds": 3,
+					"buckets": [
+						{
+							"bucket": "model",
+							"wall_seconds": 3,
+							"event_count": 7,
+						},
+					],
+				},
+			},
+		],
+		"activeRunsComplete": true,
+		"activeRunScope": "complete",
+	});
+
+	orchestrator::strip_dashboard_run_activity_volatile_fields(&mut first);
+	orchestrator::strip_dashboard_run_activity_volatile_fields(&mut second);
+
+	assert_eq!(first, second);
+	assert_eq!(first["activeRuns"][0]["run_id"], "run-1");
+	assert_eq!(first["activeRuns"][0]["child_agent_activity"]["buckets"][0]["event_count"], 7);
+	assert!(first["activeRuns"][0].get("idle_for_seconds").is_none());
+	assert!(
+		first["activeRuns"][0]["child_agent_activity"]
+			.get("current_elapsed_seconds")
+			.is_none()
+	);
+	assert!(
+		first["activeRuns"][0]["child_agent_activity"]["buckets"][0]
+			.get("wall_seconds")
+			.is_none()
+	);
 }
 
 #[test]