Make songs conflict on hash, not filename

src/fetching.rs

@@ -111,7 +111,7 @@ pub async fn index_source(source: Source, mode: IndexMode, db: &DatabaseConnecti
 
         library::Entity::insert(song)
             .on_conflict(
-                sea_query::OnConflict::column(library::Column::Filename)
+                sea_query::OnConflict::column(library::Column::Hash)
                     .do_nothing()
                     .to_owned(),
             )

src/migrator/m20220815_000001_create_library.rs

@@ -19,12 +19,7 @@ impl MigrationTrait for Migration {
                             .primary_key(),
                     )
                     .col(ColumnDef::new(Song::Path).string().not_null())
-                    .col(
-                        ColumnDef::new(Song::Filename)
-                            .string()
-                            .not_null()
-                            .unique_key(),
-                    )
+                    .col(ColumnDef::new(Song::Filename).string().not_null())
                     .col(ColumnDef::new(Song::SourceId).integer().not_null())
                     .col(ColumnDef::new(Song::Hash).integer().not_null().unique_key())
                     .col(ColumnDef::new(Song::Artist).string())