diff --git a/server/backend/internal/db/migrations/007_media_owner.sql b/server/backend/internal/db/migrations/007_media_owner.sql
new file mode 100644
index 0000000..81353e1
--- /dev/null
+++ b/server/backend/internal/db/migrations/007_media_owner.sql
@@ -0,0 +1,10 @@
+-- 007_media_owner.sql
+-- Fügt Besitzer-Referenz zu media_assets hinzu.
+-- ON DELETE SET NULL: Medium bleibt erhalten wenn User gelöscht wird.
+
+ALTER TABLE media_assets
+  ADD COLUMN created_by_user_id text NULL
+  REFERENCES users(id) ON DELETE SET NULL;
+
+CREATE INDEX idx_media_assets_created_by_user_id
+  ON media_assets(created_by_user_id);