feat(M003/S03): play count column + data pipeline

Backend:
- GetAllTracksWithFullMetadata queries now select play_count and last_played
- mapTrackRow accepts and passes through PlayCount/LastPlayed
- PlayCount + LastPlayed added to library.Track struct
- sqlcgen Row types updated with new fields

Frontend:
- PlayCount + LastPlayed added to library.Track TypeScript model
- 'Plays' column added to track-list column definitions (60px, right-aligned, sortable)

Queries without play data (search, genre, album) pass 0/empty defaults.

backend/database/sql/queries/audio_files.sql

@@ -95,7 +95,9 @@ SELECT
     af.bit_depth,
     af.channels,
     af.bitrate,
-    af.file_size
+    af.file_size,
+    af.play_count,
+    COALESCE(af.last_played, '') AS last_played
 FROM audio_files af
 JOIN recordings r ON af.recording_id = r.id
 JOIN artist_credit ac ON r.artist_credit_id = ac.id
@@ -159,7 +161,9 @@ SELECT
     af.bit_depth,
     af.channels,
     af.bitrate,
-    af.file_size
+    af.file_size,
+    af.play_count,
+    COALESCE(af.last_played, '') AS last_played
 FROM audio_files af
 JOIN recordings r ON af.recording_id = r.id
 JOIN artist_credit ac ON r.artist_credit_id = ac.id

backend/database/sql/sqlcgen/audio_files.sql.go

@@ -253,7 +253,9 @@ SELECT
     af.bit_depth,
     af.channels,
     af.bitrate,
-    af.file_size
+    af.file_size,
+    af.play_count,
+    COALESCE(af.last_played, '') AS last_played
 FROM audio_files af
 JOIN recordings r ON af.recording_id = r.id
 JOIN artist_credit ac ON r.artist_credit_id = ac.id
@@ -279,6 +281,8 @@ type GetAllTracksWithFullMetadataRow struct {
 	Channels           int64
 	Bitrate            int64
 	FileSize           int64
+	PlayCount          int64
+	LastPlayed         string
 }
 
 func (q *Queries) GetAllTracksWithFullMetadata(ctx context.Context) ([]GetAllTracksWithFullMetadataRow, error) {
@@ -307,6 +311,8 @@ func (q *Queries) GetAllTracksWithFullMetadata(ctx context.Context) ([]GetAllTra
 			&i.Channels,
 			&i.Bitrate,
 			&i.FileSize,
+			&i.PlayCount,
+			&i.LastPlayed,
 		); err != nil {
 			return nil, err
 		}
@@ -344,7 +350,9 @@ SELECT
     af.bit_depth,
     af.channels,
     af.bitrate,
-    af.file_size
+    af.file_size,
+    af.play_count,
+    COALESCE(af.last_played, '') AS last_played
 FROM audio_files af
 JOIN recordings r ON af.recording_id = r.id
 JOIN artist_credit ac ON r.artist_credit_id = ac.id
@@ -371,6 +379,8 @@ type GetAllTracksWithFullMetadataByLibraryRow struct {
 	Channels           int64
 	Bitrate            int64
 	FileSize           int64
+	PlayCount          int64
+	LastPlayed         string
 }
 
 func (q *Queries) GetAllTracksWithFullMetadataByLibrary(ctx context.Context, libraryID int64) ([]GetAllTracksWithFullMetadataByLibraryRow, error) {
@@ -399,6 +409,8 @@ func (q *Queries) GetAllTracksWithFullMetadataByLibrary(ctx context.Context, lib
 			&i.Channels,
 			&i.Bitrate,
 			&i.FileSize,
+			&i.PlayCount,
+			&i.LastPlayed,
 		); err != nil {
 			return nil, err
 		}

backend/library/query.go

@@ -65,6 +65,8 @@ func mapTrackRow(
 	year int64,
 	composer, fileType string,
 	sampleRate, bitDepth, channels, bitrate, fileSize int64,
+	playCount int64,
+	lastPlayed string,
 ) Track {
 	return Track{
 		TrackName:   title,
@@ -83,6 +85,8 @@ func mapTrackRow(
 		Channels:    channels,
 		Bitrate:     bitrate,
 		FileSize:    fileSize,
+		PlayCount:   playCount,
+		LastPlayed:  lastPlayed,
 	}
 }
 
@@ -146,6 +150,8 @@ func (l *Library) GetAllTracks() ([]Track, error) {
 			row.Channels,
 			row.Bitrate,
 			row.FileSize,
+			row.PlayCount,
+			row.LastPlayed,
 		))
 	}
 
@@ -198,6 +204,7 @@ func (l *Library) SearchTracks(
 			row.Channels,
 			row.Bitrate,
 			row.FileSize,
+			0, "",
 		))
 	}
 
@@ -237,6 +244,7 @@ func (l *Library) GetAlbumTracks(albumID int64) ([]Track, error) {
 			row.Channels,
 			row.Bitrate,
 			row.FileSize,
+			0, "",
 		))
 	}
 
@@ -411,6 +419,7 @@ func (l *Library) GetTracksByGenre(
 			row.Channels,
 			row.Bitrate,
 			row.FileSize,
+			0, "",
 		))
 	}
 
@@ -492,6 +501,8 @@ func (l *Library) GetAllTracksByLibrary(
 			row.Channels,
 			row.Bitrate,
 			row.FileSize,
+			row.PlayCount,
+			row.LastPlayed,
 		))
 	}
 
@@ -724,6 +735,7 @@ func (l *Library) GetTracksByGenreByLibrary(
 			row.Channels,
 			row.Bitrate,
 			row.FileSize,
+			0, "",
 		))
 	}
 
@@ -775,6 +787,7 @@ func (l *Library) GetAlbumTracksByLibrary(
 			row.Channels,
 			row.Bitrate,
 			row.FileSize,
+			0, "",
 		))
 	}
 
@@ -822,6 +835,7 @@ func (l *Library) SearchTracksByLibrary(
 			row.Channels,
 			row.Bitrate,
 			row.FileSize,
+			0, "",
 		))
 	}
 

frontend/src/components/track-list/columns.ts

@@ -186,6 +186,16 @@ export const COLUMN_DEFS: Record<string, ColumnDef> = {
         comparator: (a, b) =>
             compareNum(a.FileSize, b.FileSize),
     },
+    playCount: {
+        id: 'playCount',
+        label: 'Plays',
+        accessor: (t) =>
+            t.PlayCount ? String(t.PlayCount) : '',
+        defaultWidth: '60px',
+        align: 'right',
+        comparator: (a, b) =>
+            compareNum(a.PlayCount, b.PlayCount),
+    },
 };
 
 /**

frontend/wailsjs/go/models.ts

@@ -266,6 +266,8 @@ export namespace library {
 	    Channels: number;
 	    Bitrate: number;
 	    FileSize: number;
+	    PlayCount: number;
+	    LastPlayed: string;
 	
 	    static createFrom(source: any = {}) {
 	        return new Track(source);
@@ -289,6 +291,8 @@ export namespace library {
 	        this.Channels = source["Channels"];
 	        this.Bitrate = source["Bitrate"];
 	        this.FileSize = source["FileSize"];
+	        this.PlayCount = source["PlayCount"];
+	        this.LastPlayed = source["LastPlayed"];
 	    }
 	}