bring in database

switch to just using source models (no extra db fields)
start re-implementing sync service

lib/database/converters.dart

@@ -0,0 +1,51 @@
+import 'dart:convert';
+
+import 'package:drift/drift.dart';
+import 'package:fast_immutable_collections/fast_immutable_collections.dart';
+
+class DurationSecondsConverter extends TypeConverter<Duration, int> {
+  const DurationSecondsConverter();
+
+  @override
+  Duration fromSql(int fromDb) => Duration(seconds: fromDb);
+
+  @override
+  int toSql(Duration value) => value.inSeconds;
+}
+
+class UriConverter extends TypeConverter<Uri, String> {
+  const UriConverter();
+
+  @override
+  Uri fromSql(String fromDb) => Uri.parse(fromDb);
+
+  @override
+  String toSql(Uri value) => value.toString();
+}
+
+// class ListQueryConverter extends TypeConverter<ListQuery, String> {
+//   const ListQueryConverter();
+
+//   @override
+//   ListQuery fromSql(String fromDb) => ListQuery.fromJson(jsonDecode(fromDb));
+
+//   @override
+//   String toSql(ListQuery value) => jsonEncode(value.toJson());
+// }
+
+class IListIntConverter extends TypeConverter<IList<int>, String> {
+  const IListIntConverter();
+
+  @override
+  IList<int> fromSql(String fromDb) {
+    return IList<int>.fromJson(
+      jsonDecode(fromDb),
+      (item) => int.parse(item as String),
+    );
+  }
+
+  @override
+  String toSql(IList<int> value) {
+    return jsonEncode(value.toJson((e) => jsonEncode(e)));
+  }
+}