upd: try fetching from db

packages/megalodon/src/misskey/api_client.ts

@@ -88,7 +88,7 @@ namespace MisskeyAPI {
         suspended: null,
         limited: null,
         created_at: '',
-        createdAt: '',
+        createdAt: u.createdAt,
         followers_count: 0,
         following_count: 0,
         statuses_count: 0,

packages/megalodon/src/misskey/entities/user.ts

@@ -5,6 +5,7 @@ namespace MisskeyEntity {
     id: string
     name: string
     username: string
+    createdAt?: string
     host: string | null
     avatarUrl: string
     avatarColor: string