Move scheduler to settings and add next run at system

@@ -47,7 +47,7 @@ class ScheduledTaskAdmin(ModelAdmin):    menu_icon = 'time'    add_to_settings_menu = True    menu_order = 900    list_display = ('management_command', 'run_interval', 'last_run_at',)    list_display = ('management_command', 'run_interval', 'last_run_at', 'next_run_at')    list_filter = ('run_interval',)    search_fields = ('management_command',)    ordering = ('-run_interval',)

@@ -16,9 +16,11 @@ class Command(BaseCommand):                if task.should_run():                    now = timezone.now()                    timestamp = now.strftime('%d/%b/%Y %H:%M:%S %z')                    print(timestamp)                    self.stdout.write(f'[Scheduler] [{timestamp}] Running task {task.management_command}')                    call_command(task.management_command)                    task.last_run_at = now                    task.next_run_at = task.get_next_run_at(now)                    task.save()            time.sleep(60)            time.sleep(5)            self.stdout.write('[Scheduler] Sleeping scheduler for 60 seconds...')

@@ -0,0 +1,18 @@# Generated by Django 4.0.5 on 2022-06-16 03:58from django.db import migrations, modelsclass Migration(migrations.Migration):    dependencies = [        ('scheduler', '0001_initial'),    ]    operations = [        migrations.AddField(            model_name='scheduledtask',            name='next_run_at',            field=models.DateTimeField(blank=True, null=True),        ),    ]

@@ -20,6 +20,7 @@ class ScheduledTask(models.Model):    )    run_interval = models.IntegerField(choices=RUN_INTERVAL_CHOICES)    last_run_at = models.DateTimeField(blank=True, null=True)    next_run_at = models.DateTimeField(blank=True, null=True)    def __str__(self):        return self.management_command

@@ -28,4 +29,31 @@ class ScheduledTask(models.Model):        now = timezone.now()        if self.last_run_at is None:            return True        return self.last_run_at + timezone.timedelta(seconds=self.run_interval) < now        if self.next_run_at is None:            return True        return self.next_run_at <= now    def get_next_run_at(self, now):        """        Returns the next run datetime. Should be in whole increments of the run        interval.        Every 5 minutes should be rounded to the nearest 5 minutes.        Every 15 minutes should be rounded to the nearest 15 minutes.        Every 30 minutes should be rounded to the nearest 30 minutes.        Every hour should be rounded to the nearest hour.        Every day should be rounded to the nearest day.        """        if self.run_interval == 300:            return now.replace(minute=(now.minute // 5) * 5, second=0, microsecond=0) + timezone.timedelta(minutes=5)        elif self.run_interval == 900:            return now.replace(minute=(now.minute // 15) * 15, second=0, microsecond=0) + timezone.timedelta(minutes=15)        elif self.run_interval == 1800:            return now.replace(minute=(now.minute // 30) * 30, second=0, microsecond=0) + timezone.timedelta(minutes=30)        elif self.run_interval == 3600:            return now.replace(minute=0, second=0, microsecond=0) + timezone.timedelta(hours=1)        elif self.run_interval == 86400:            return now.replace(hour=0, minute=0, second=0, microsecond=0) + timezone.timedelta(days=1)        else:            raise ValueError("Invalid run interval")