aggregate data fix

src/db/mod.rs

@@ -181,11 +181,13 @@ pub async fn list_note_stats(
         DatabaseKind::Postgres => "$1",
         DatabaseKind::Sqlite | DatabaseKind::MySql => "?",
     };
-    // PostgreSQL promotes SUM(BIGINT) to NUMERIC. sqlx::Any cannot decode the
-    // database-specific NUMERIC type, so normalize the aggregate to BIGINT.
+    // PostgreSQL and MySQL promote SUM(BIGINT) to database-specific decimal
+    // types. sqlx::Any cannot decode those types, so normalize the aggregate
+    // to a signed 64-bit integer before reading it.
     let file_size_sum = match pool.kind() {
         DatabaseKind::Postgres => "COALESCE(SUM(f.size_bytes), 0)::BIGINT",
-        DatabaseKind::Sqlite | DatabaseKind::MySql => "COALESCE(SUM(f.size_bytes), 0)",
+        DatabaseKind::MySql => "CAST(COALESCE(SUM(f.size_bytes), 0) AS SIGNED)",
+        DatabaseKind::Sqlite => "COALESCE(SUM(f.size_bytes), 0)",
     };
     let query = format!(
         "SELECT n.id AS note_id, \