fix(README.md + cache_service): Update last_seen

Added missing last_seen update to datetime.utcnow() for each agent and
camera. Last seen column was not updating.
Fixed some formatting in
README.md

README.md

@@ -97,16 +97,14 @@ WantedBy=multi-user.target
 
 Be sure to modify `User`, `WorkingDirectory`, and `ExecStart`.
 
-`User` should not have root privileges without invoking sudo!
+> ⚠️ `User` should not have root privileges without invoking sudo!
 
 Then execute:
-
-`sudo systemctl daemon-reload`
-
-`sudo systemctl enable oalpr-wh`
-
-`sudo systemctl start oalpr-wh`
-
+```shell
+sudo systemctl daemon-reload
+sudo systemctl enable oalpr-wh
+sudo systemctl start oalpr-wh
+```
 Optional: `journalctl -n 50 -f`
 
 ### New Instance

apps/api/service/cache_service.py

@@ -96,6 +96,7 @@ def update(self):
                 else:
                     # Always overwrite the label, it may have changed
                     agent_uid.agent_label = self.request['web_server_config']['agent_label']
+                    agent_uid.last_seen = datetime.utcnow()
                 agent_uid.save()
 
                 # Cameras
@@ -107,6 +108,7 @@ def update(self):
                 else:
                     # Always overwrite the label, it may have changed
                     camera_id.camera_label = self.request['web_server_config']['camera_label']
+                    camera_id.last_seen = datetime.utcnow()
                 camera_id.save()
 
                 # Check to see if we need to send an alert