Add configurable history and storage retention policies

src/lib/server/game-files/schema.ts

@@ -49,6 +49,8 @@ export function ensureGameFileSchema(handle: Database.Database): void {
         CREATE TRIGGER IF NOT EXISTS game_file_versions_immutable BEFORE UPDATE ON game_file_versions
         WHEN OLD.state = 'ready' BEGIN SELECT RAISE(ABORT, 'Published game-file versions are immutable'); END;
     `);
+    const versionColumns = handle.prepare('PRAGMA table_info(game_file_versions)').all() as { name: string }[];
+    if (!versionColumns.some(column => column.name === 'last_activity_at')) handle.exec('ALTER TABLE game_file_versions ADD COLUMN last_activity_at TEXT');
     const cacheColumns = handle.prepare('PRAGMA table_info(host_library_caches)').all() as { name: string }[];
     if (!cacheColumns.some(column => column.name === 'bytes_verified')) handle.exec('ALTER TABLE host_library_caches ADD COLUMN bytes_verified INTEGER');
     if (!cacheColumns.some(column => column.name === 'transfer_progress')) handle.exec('ALTER TABLE host_library_caches ADD COLUMN transfer_progress TEXT');