diff --git a/db-migration/migrate-measurement-collection-to-ttl.js b/db-migration/migrate-measurement-collection-to-ttl.js
index b5f3ba2..4216177 100644
--- a/db-migration/migrate-measurement-collection-to-ttl.js
+++ b/db-migration/migrate-measurement-collection-to-ttl.js
@@ -6,11 +6,11 @@ while (cursor.hasNext()) {
     const oldCollection = `${station._id}`;
     const newCollection = `${station._id}-ttl`;
 
-    db[newCollection].createIndex({time: 1}, {expireAfterSeconds: 60 * 60 * 24 * 10});
     db[oldCollection].aggregate([
         {$set: {receivedAt: {$toDate: {$multiply: ["$time", 1000]}}}},
         {$set: {time: {$toDate: {$multiply: ["$_id", 1000]}}}},
         {$out: newCollection}]
     );
+    db[newCollection].createIndex({time: 1}, {expireAfterSeconds: 60 * 60 * 24 * 10});
     db[newCollection].renameCollection(oldCollection, true);
 }
diff --git a/winds_mobi_provider/provider.py b/winds_mobi_provider/provider.py
index baebf60..6c6e520 100644
--- a/winds_mobi_provider/provider.py
+++ b/winds_mobi_provider/provider.py
@@ -261,7 +261,8 @@ def __create_station(
             },
             "status": status,
             "tz": tz,
-            "seen": arrow.utcnow().int_timestamp,
+            "seen": arrow.utcnow().int_timestamp,  # deprecated
+            "lastSeenAt": arrow.utcnow().datetime,
         }
         return station
 
@@ -405,7 +406,7 @@ def create_measure(
             measure["rain"] = self.__to_rain(rain)
 
         measure["time"] = arrow.get(measure["_id"]).datetime
-        measure["receivedAt"] = arrow.now().datetime
+        measure["receivedAt"] = arrow.utcnow().datetime
 
         fixes = self.mongo_db.stations_fix.find_one(for_station["_id"])
         if fixes and "measures" in fixes: