Prevent duplicate car status rows

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, $readMs);
+    if ($uiTimedOut) {
         tcp_queue_maybe_store_status($pdo, $job, $trimmed);
+    }
 }
 
 function tcp_request_wait_for_queue(
@@ -727,6 +729,23 @@ function db_insert_status(
         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,
@@ -743,7 +762,7 @@ function db_insert_status(
 
     $stmt = $pdo->prepare($sql);
     $stmt->execute([
-        ':ts' => date('Y-m-d H:i:s'),
+        ':ts' => $ts,
         ':cmd' => $cmd,
 
         ':boundary' => $data['boundary'],