Fix crash with unsupported integer types

src/backend/model/library.rs

@@ -10,11 +10,11 @@ pub struct Model {
     pub path: String,
     pub filename: String,
     pub source_id: i32,
-    pub hash: u64,
+    pub hash: u32,
     pub artist: Option<String>,
     pub name: Option<String>,
     pub album: Option<String>,
-    pub duration: u64,
+    pub duration: u32,
     pub genres: Option<String>,
     pub track: Option<i32>,
     pub year: Option<i32>,