hard limit enforcement, detect deleted files on load

src/tasks/scheduled_tasks.rs

@@ -72,10 +72,18 @@ pub async fn scheduled_tasks_loop() {
 
         for task in &mut tasks {
             let mut first_exec = false;
+
+            if let Some(last_exec) = task.last_exec {
+                if(task.interval == Duration::from_secs(0)) {
+                    continue ;
+                }
+            }
+
             let should_exec = match task.last_exec {
                 Some(time) => SystemTime::now().duration_since(time).expect("how ???") >= task.interval,
                 None => { first_exec = true; true }
             };
+
             if should_exec {
                 tracing::info!("running task {}", task.name);
                 (task.f)(first_exec);