add a monitoring camera setting for cetana

apps/live_monitoring/models.py

@@ -1,20 +1,39 @@
 from django.db import models
 
 from apps.core.models import TimeStampedModel, UUIDModel
+from apps.live_monitoring.protocols import DEFAULT_PROTOCOL, PROTOCOL_CHOICES
 
 
 class Camera(UUIDModel, TimeStampedModel):
     name = models.CharField(max_length=200)
     facility = models.CharField(max_length=200, blank=True)
     processing_line = models.CharField(max_length=200, blank=True)
-    stream_url = models.URLField()
+    # Blank = inherit camera.default_protocol from Live Monitoring settings.
+    protocol = models.CharField(
+        max_length=32,
+        choices=PROTOCOL_CHOICES,
+        blank=True,
+        default="",
+        help_text="Streaming standard. Leave blank to use the system default protocol.",
+    )
+    # CharField (not URLField) so RTSP/RTMP/SRT URLs are accepted.
+    stream_url = models.CharField(max_length=1000)
     # Never expose credentials to the frontend; keep auth config server-side.
+    # Expected keys: username, password, token, auth_method, host, port, path, transport…
     auth_config = models.JSONField(default=dict, blank=True)
     active = models.BooleanField(default=True)
 
     def __str__(self) -> str:
         return self.name
 
+    def resolved_protocol(self) -> str:
+        if self.protocol:
+            return self.protocol
+        from apps.core.settings_service import SettingsService
+
+        value = SettingsService().get("camera.default_protocol", DEFAULT_PROTOCOL)
+        return value if value in dict(PROTOCOL_CHOICES) else DEFAULT_PROTOCOL
+
 
 class LiveStream(UUIDModel, TimeStampedModel):
     camera = models.ForeignKey(Camera, on_delete=models.CASCADE, related_name="streams")