diff --git a/common.php b/common.php
index 9744535..ee2c985 100644
--- a/common.php
+++ b/common.php
@@ -494,7 +494,9 @@ function tcp_worker_process_job(array $job): void
     $status = $uiTimedOut ? 'settled_late' : 'settled';
     $error = $uiTimedOut ? 'late_response_after_ui_timeout' : '';
     tcp_queue_record_usage_and_status($pdo, $job, $status, $sentBytes, $receivedBytes, true, $error, $trimmed, $connectMs, $readMs);
-    tcp_queue_maybe_store_status($pdo, $job, $trimmed);
+    if ($uiTimedOut) {
+        tcp_queue_maybe_store_status($pdo, $job, $trimmed);
+    }
 }
 
 function tcp_request_wait_for_queue(
@@ -701,14 +703,14 @@ function is_valid_status_data(array $data): bool
     return true;
 }
 
-function db_insert_status(
+function db_insert_status(
     PDO $pdo,
     string $cmd,
     string $rawFull,
     string $rawTrim,
     array $data
-): void {
-    $v = (float)($data['battery_voltage'] ?? 0);
+): void {
+    $v = (float)($data['battery_voltage'] ?? 0);
 
     // 1V는 저장 금지
     if ($v <= 1.0) {
@@ -723,11 +725,28 @@ function db_insert_status(
         (int)$data['remote_start_preparing'] === 1 ||
         (int)$data['remote_start_running'] === 1;
 
-    if (!$engineOn && $v >= 14.2) {
-        return;
-    }
-
-    $sql = "INSERT INTO car_status (
+    if (!$engineOn && $v >= 14.2) {
+        return;
+    }
+
+    $ts = date('Y-m-d H:i:s');
+
+    $dupStmt = $pdo->prepare(""
+        . "SELECT seq FROM car_status "
+        . "WHERE id='car' AND ts = :ts AND cmd <=> :cmd AND raw_trim <=> :raw_trim "
+        . "ORDER BY seq ASC LIMIT 1"
+    );
+    $dupStmt->execute([
+        ':ts' => $ts,
+        ':cmd' => $cmd,
+        ':raw_trim' => $rawTrim,
+    ]);
+
+    if ($dupStmt->fetchColumn()) {
+        return;
+    }
+
+    $sql = "INSERT INTO car_status (
         id, ts, cmd,
         boundary, engine, driving, battery_voltage,
         door_fl, door_fr, door_rl, door_rr, door_trunk,
@@ -741,10 +760,10 @@ function db_insert_status(
         :hazard, :raw_full, :raw_trim
     )";
 
-    $stmt = $pdo->prepare($sql);
-    $stmt->execute([
-        ':ts' => date('Y-m-d H:i:s'),
-        ':cmd' => $cmd,
+    $stmt = $pdo->prepare($sql);
+    $stmt->execute([
+        ':ts' => $ts,
+        ':cmd' => $cmd,
 
         ':boundary' => $data['boundary'],
         ':engine' => $data['engine'],