diff --git a/.env.example b/.env.example
index 3048141..d22fe3e 100644
--- a/.env.example
+++ b/.env.example
@@ -47,8 +47,9 @@ MAX_PARALLEL_DOWNLOADS=2
 # set it to enable AcoustID fingerprint → MusicBrainz identification.
 # Get a free key at https://acoustid.org/new-application
 ACOUSTID_API_KEY=
-# Sent to MusicBrainz/AcoustID — put a real contact so you don't get rate-limited.
-MUSICBRAINZ_USER_AGENT=mcma-backend/0.1.0 ( https://github.com/your/repo )
+# Your contact email, sent to MusicBrainz/AcoustID as part of the User-Agent
+# (required by their usage policy — apps without one get throttled).
+MUSICBRAINZ_OWNER_EMAIL=
 # YOUTUBE_COOKIES_PATH=/data/cookies.txt
 
 # ---- Frontend (webui) ------------------------------------------------
diff --git a/mcma-backend b/mcma-backend
index 356cd00..c7e078d 160000
--- a/mcma-backend
+++ b/mcma-backend
@@ -1 +1 @@
-Subproject commit 356cd0077264acd95139d92e3a5a20f8d8f1ffff
+Subproject commit c7e078d758cb2fc3f3f488f3c7d9746ca749aacc