remove builds from db if pkg is deleted

fix apibuilder interval refreshes refreshing widgets not visible

frontend/lib/components/api/APIBuilder.dart

@@ -0,0 +1,82 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:visibility_detector/visibility_detector.dart';
+
+import '../../providers/BaseProvider.dart';
+
+class APIBuilder<T extends BaseProvider, K, DTO> extends StatefulWidget {
+  const APIBuilder(
+      {super.key,
+      required this.onLoad,
+      required this.onData,
+      this.interval,
+      this.dto});
+
+  final DTO? dto;
+  final Duration? interval;
+  final Widget Function() onLoad;
+  final Widget Function(K t) onData;
+
+  @override
+  State<APIBuilder<T, K, DTO>> createState() => _APIBuilderState<T, K, DTO>();
+}
+
+class _APIBuilderState<T extends BaseProvider, K, DTO>
+    extends State<APIBuilder<T, K, DTO>> {
+  Timer? timer;
+  bool visible = true;
+
+  @override
+  void initState() {
+    super.initState();
+    Provider.of<T>(context, listen: false).loadFuture(context, dto: widget.dto);
+
+    if (widget.interval != null) {
+      timer = Timer.periodic(widget.interval!, (Timer t) {
+        if (visible) {
+          Provider.of<T>(context, listen: false)
+              .refresh(context, dto: widget.dto);
+        }
+      });
+    }
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+    timer?.cancel();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final Future<K> fut = Provider.of<T>(context).data as Future<K>;
+
+    return VisibilityDetector(
+      key: widget.key ?? const Key("APIBuilder"),
+      onVisibilityChanged: (visibilityInfo) {
+        var visiblePercentage = visibilityInfo.visibleFraction * 100;
+
+        if (mounted) {
+          setState(() {
+            visible = visiblePercentage != 0;
+          });
+        }
+
+        debugPrint(
+            'Widget ${visibilityInfo.key} is ${visiblePercentage}% visible');
+      },
+      child: FutureBuilder<K>(
+        future: fut,
+        builder: (context, snapshot) {
+          if (snapshot.hasData) {
+            return widget.onData(snapshot.data!);
+          } else {
+            return widget.onLoad();
+          }
+        },
+      ),
+    );
+  }
+}