feat: add task deletion for all users

app/routes/tasks.py

@@ -15,6 +15,7 @@ from ..services.tasks import (
     complete_task,
     create_quick_task,
     create_task_template_and_instance,
+    delete_task_instance,
     refresh_task_statuses,
     update_template_and_instance,
 )
@@ -157,6 +158,7 @@ def edit(task_id: int):
     task = TaskInstance.query.get_or_404(task_id)
     form = TaskForm(obj=task.task_template)
     form.assigned_user_id.choices = _user_choices()
+    next_url = request.args.get("next") or request.form.get("next") or request.referrer or url_for("tasks.all_tasks")
 
     if request.method == "GET":
         form.title.data = task.title
@@ -171,9 +173,21 @@ def edit(task_id: int):
     if form.validate_on_submit():
         update_template_and_instance(task, form)
         flash("Aufgabe und Vorlage wurden aktualisiert.", "success")
-        return redirect(url_for("tasks.all_tasks"))
+        return redirect(next_url)
 
-    return render_template("tasks/task_form.html", form=form, mode="edit", task=task)
+    return render_template("tasks/task_form.html", form=form, mode="edit", task=task, next_url=next_url)
+
+
+@bp.route("/tasks/<int:task_id>/delete", methods=["POST"])
+@login_required
+def delete(task_id: int):
+    task = TaskInstance.query.get_or_404(task_id)
+    title = task.title
+    next_url = request.form.get("next") or url_for("tasks.all_tasks")
+
+    delete_task_instance(task)
+    flash(f"Aufgabe „{title}“ wurde gelöscht.", "success")
+    return redirect(next_url)
 
 
 @bp.route("/tasks/<int:task_id>/complete", methods=["POST"])