diff --git a/src/main/kotlin/com/openlattice/chronicle/survey/AppUsage.kt b/src/main/kotlin/com/openlattice/chronicle/survey/AppUsage.kt
index 903298b..8af0f34 100644
--- a/src/main/kotlin/com/openlattice/chronicle/survey/AppUsage.kt
+++ b/src/main/kotlin/com/openlattice/chronicle/survey/AppUsage.kt
@@ -13,6 +13,7 @@ data class AppUsage(
     val eventType: Int,
     val users: List<String> = listOf(),
     val timezone: String,
+    val uploadedAt: Optional<OffsetDateTime>
 ) {
     init {
         if (appLabel?.isBlank() == true) {