linux build

cache previews in sqlite db
actor page
outsouce different players in seperate classes

lib/db/database.dart

@@ -0,0 +1,55 @@
+import 'package:flutter/foundation.dart';
+import 'package:path/path.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:sqflite_common_ffi/sqflite_ffi.dart';
+
+import '../log/log.dart';
+
+class Db {
+  late Database _db;
+
+  void init() async {
+    if (kIsWeb) {
+      Log.i("Database on web is not supported");
+      return;
+    }
+    String dbpath = 'previews.db';
+    if (defaultTargetPlatform == TargetPlatform.android ||
+        defaultTargetPlatform == TargetPlatform.iOS) {
+      dbpath = join(await getDatabasesPath(), dbpath);
+    } else {
+      // Initialize FFI
+      sqfliteFfiInit();
+      // Change the default factory
+      databaseFactory = databaseFactoryFfi;
+    }
+
+    _db = await openDatabase(
+      // Set the path to the database. Note: Using the `join` function from the
+      // `path` package is best practice to ensure the path is correctly
+      // constructed for each platform.
+      join(await getDatabasesPath(), 'previews.db'),
+      onCreate: (db, version) {
+        // Run the CREATE TABLE statement on the database.
+        return db.execute(
+          'CREATE TABLE previews(id INTEGER PRIMARY KEY, thumbnail BLOB)',
+        );
+      },
+      // Set the version. This executes the onCreate function and provides a
+      // path to perform database upgrades and downgrades.
+      version: 1,
+    );
+  }
+
+  Database db() {
+    return _db;
+  }
+
+  static final Db _singleton = Db._internal();
+
+  factory Db() {
+    return _singleton;
+  }
+
+  Db._internal();
+}