feat: when scanning, skip known paths

In the future we'll have to check for updated time,
but this is a basic countermeasure to having to clear the db
and rescan the whole collection.

rave/src/scan.rs

@@ -2,7 +2,8 @@ use audiotags::MimeType;
 use color_eyre::{Report, Result};
 use entities::{
     cover_art, genre, music_folder,
-    prelude::{CoverArt, Genre, MusicFolder},
+    prelude::{CoverArt, Genre, MusicFolder, Track},
+    track,
 };
 use futures::StreamExt;
 use once_cell::sync::Lazy;
@@ -132,6 +133,17 @@ async fn handle_entry(
     state: Arc<RwLock<ScanState>>,
 ) -> Result<()> {
     let path = entry.path();
+
+    {
+        let query = Track::find().filter(track::Column::Path.eq(path.to_string_lossy()));
+        let res = query.one(tx).await;
+
+        if let Ok(Some(_)) = res {
+            debug!("Skipping already scanned file {path:?}");
+            return Ok(());
+        }
+    }
+
     let file_type = entry.file_type().await?;
 
     if !file_type.is_file() {