refactor(backend): split stream routes into focused modules

Backend/services/recordings.ts

@@ -0,0 +1,27 @@
+import { eq } from 'drizzle-orm';
+
+import { db } from '../db/client';
+import { recordings, streamSessions } from '../db/schema';
+
+export const createRecordingForStream = async (streamSessionId: string): Promise<void> => {
+  const stream = await db.query.streamSessions.findFirst({ where: eq(streamSessions.id, streamSessionId) });
+
+  if (!stream) {
+    return;
+  }
+
+  const existing = await db.query.recordings.findFirst({ where: eq(recordings.streamSessionId, stream.id) });
+
+  if (existing) {
+    return;
+  }
+
+  await db.insert(recordings).values({
+    ownerUserId: stream.ownerUserId,
+    streamSessionId: stream.id,
+    cameraDeviceId: stream.cameraDeviceId,
+    requesterDeviceId: stream.requesterDeviceId,
+    status: 'awaiting_upload',
+    updatedAt: new Date(),
+  });
+};