more fixes

mobile/lib/extensions/drift_extensions.dart

@@ -0,0 +1,17 @@
+import 'dart:math';
+
+import 'package:drift/drift.dart';
+// ignore: invalid_use_of_internal_member, implementation_imports
+import 'package:drift/src/runtime/query_builder/expressions/internal.dart';
+
+extension DoubleTruncateExpression<T extends num> on Expression<T> {
+  Expression<T> truncateTo(int fractionDigits) {
+    final mod = Constant(pow(10, fractionDigits).toDouble());
+    return BaseInfixOperator(
+      BaseInfixOperator(this, '*', mod, precedence: Precedence.mulDivide).cast(DriftSqlType.int),
+      '/',
+      mod,
+      precedence: Precedence.mulDivide,
+    );
+  }
+}

mobile/lib/extensions/num_extensions.dart

@@ -0,0 +1,8 @@
+import 'dart:math' as math;
+
+extension DoubleTruncate on double {
+  double truncateTo(int fractionDigits) {
+    final mod = math.pow(10.0, fractionDigits);
+    return ((this * mod).truncate() / mod);
+  }
+}