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,
+    );
+  }
+}