Store MusicFolder as a library in DB

db/migrations/20240511220020_add_library_table.go

@@ -0,0 +1,71 @@
+package migrations
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"github.com/navidrome/navidrome/conf"
+	"github.com/pressly/goose/v3"
+)
+
+func init() {
+	goose.AddMigrationContext(upAddLibraryTable, downAddLibraryTable)
+}
+
+func upAddLibraryTable(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, `
+		create table library (
+			id integer primary key autoincrement,
+			name text not null unique,
+			path text not null unique,
+			remote_path text null default '',
+			last_scan_at datetime not null default '0000-00-00 00:00:00',
+			updated_at datetime not null default current_timestamp,
+			created_at datetime not null default current_timestamp
+		);`)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.ExecContext(ctx, fmt.Sprintf(`
+		insert into library(id, name, path, last_scan_at) values(1, 'Music Library', '%s', current_timestamp);
+		delete from property where id like 'LastScan-%%';
+`, conf.Server.MusicFolder))
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.ExecContext(ctx, `
+		alter table media_file add column library_id integer not null default 1 
+		   references library(id) on delete cascade;
+		alter table album add column library_id integer not null default 1 
+		   references library(id) on delete cascade;
+
+		create table if not exists  library_artist
+		(
+			library_id integer not null default 1
+				references library(id)
+					on delete cascade,
+			artist_id varchar not null default null
+				references artist(id)
+					on delete cascade,
+			constraint library_artist_ux
+				unique (library_id, artist_id)
+		);
+
+		insert into library_artist(library_id, artist_id) select 1, id from artist;
+`)
+
+	return err
+}
+
+func downAddLibraryTable(ctx context.Context, tx *sql.Tx) error {
+	_, err := tx.ExecContext(ctx, `
+		alter table media_file drop column library_id;
+		alter table album drop column library_id;
+		drop table library_artist;	
+		drop table library;
+`)
+	return err
+}