Reorder commit and metadata count logic

Move `tx.commit()?` after counting metadata rows under the old lazy_pk to ensure accurate count before commit. This fixes a potential race or inconsistency where metadata might be updated after commit, leading to incorrect logging of remaining rows under lazy_pk.

pmocache/src/db.rs

@@ -1137,17 +1137,17 @@ impl DB {
             return Err(Error::QueryReturnedNoRows);
         }
 
-        tx.commit()?;
-
-        // Compter les métadonnées encore sous l'ancien lazy_pk (après migration de l'asset)
-        let meta_under_lazy: i64 = {
-            let conn = self.lock_conn("update_lazy_to_downloaded_meta_check");
-            conn.query_row(
+        // Compter les métadonnées encore sous l'ancien lazy_pk avant le commit
+        let meta_under_lazy: i64 = tx
+            .query_row(
                 "SELECT COUNT(*) FROM metadata WHERE pk = ?1",
                 [lazy_pk],
                 |r| r.get(0),
-            ).unwrap_or(0)
-        };
+            )
+            .unwrap_or(0);
+
+        tx.commit()?;
+
         tracing::debug!(
             "update_lazy_to_downloaded: {} → {} ({} metadata rows still under lazy_pk)",
             lazy_pk, real_pk, meta_under_lazy