Get running status based on operation DB

See also: #7

wlm_server/operation/views.py

@@ -0,0 +1,18 @@
+from operation.models import Operation
+
+def get_running_status(ch: int) -> tuple[bool, bool]:
+    """Gets running status of WLM and the given channel based on operation DB.
+    
+    Args:
+        ch: Target channel.
+
+    Returns:
+        Tuple with WLM running status and target channel running status.
+    """
+    latest_operations = (
+        Operation.objects.order_by('channel', 'user', '-occured_at').distinct('channel', 'user')
+    )  # latest operations for each channel and user
+    on_operations = latest_operations.filter(on=True)
+    is_wlm_running = on_operations.exists()
+    is_channel_running = on_operations.filter(channel__channel=ch).exists()
+    return is_wlm_running, is_channel_running