Switch to more_ffi

This will be required to run the database in a background isolate.

lib/database.dart

@@ -1,6 +1,10 @@
+import 'dart:io';
 import 'dart:math';
 
-import 'package:moor_flutter/moor_flutter.dart';
+import 'package:moor/moor.dart';
+import 'package:moor_ffi/moor_ffi.dart';
+import 'package:path/path.dart' as p;
+import 'package:path_provider/path_provider.dart' as pp;
 
 part 'database.g.dart';
 
@@ -36,7 +40,11 @@ class PerformanceModel {
 )
 class Database extends _$Database {
   Database(String fileName)
-      : super(FlutterQueryExecutor.inDatabaseFolder(path: fileName));
+      : super(LazyDatabase(() async {
+          final dir = await pp.getApplicationDocumentsDirectory();
+          final file = File(p.join(dir.path, fileName));
+          return VmDatabase(file);
+        }));
 
   @override
   int get schemaVersion => 1;

pubspec.yaml

@@ -11,8 +11,10 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  moor_flutter:
+  moor:
+  moor_ffi:
   path:
+  path_provider:
   rxdart:
   shared_preferences: