refactor(backend): simplify media schema and recording metadata

Backend/public/mobile-sim.js

@@ -948,6 +948,7 @@ const finalizeRecordingForStream = async (streamSessionId, captureResult) => {
             fileName: `stream-${streamSessionId}.webm`,
             deviceId: currentDevice.id,
             prefix: 'recordings',
+            recordingId: recording.id,
           }),
         });
 
@@ -1010,6 +1011,7 @@ const uploadStandaloneMotionRecording = async (captureResult) => {
         fileName: `motion-${Date.now()}.webm`,
         deviceId: currentDevice.id,
         prefix: 'recordings',
+        eventId: lastMotionEventId,
       }),
     });
 
@@ -1023,6 +1025,13 @@ const uploadStandaloneMotionRecording = async (captureResult) => {
       throw new Error(`Upload failed with status ${uploadResponse.status}`);
     }
 
+    await API.events.finalizeRecording(uploadMeta.video.id, {
+      objectKey: uploadMeta.objectKey,
+      bucket: uploadMeta.bucket,
+      durationSeconds: captureResult.durationSeconds,
+      sizeBytes: compressedBlob.size,
+    });
+
     addActivity('Recording', `Motion clip uploaded (${uploadMeta.objectKey})`);
     return true;
   } catch (error) {