feat: playback where I left off

js/src/lib/firestore-particles.ts

@@ -50,9 +50,9 @@ const particleConverter: FirestoreDataConverter<Particle> = {
           created_by_email: raw.created_by_email,
           updated_at: raw.updated_at ? (raw.updated_at as Timestamp).toDate() : undefined,
           visible_to: raw.visible_to,
-          markers: raw.markers
+          playback_markers: raw.playback_markers
             ? Object.fromEntries(
-              Object.entries(raw.markers).map(([key, value]) => [
+              Object.entries(raw.playback_markers).map(([key, value]) => [
                 key,
                 (value as Timestamp).toDate(),
               ]),
@@ -240,7 +240,7 @@ export async function updateParticle(
   });
 }
 
-export async function updateStreamParticleLastChildParticle(
+export async function updateStreamLastChildAt(
   docPath: string,
 ): Promise<void> {
   const particleRef = typedDoc(docPath);
@@ -249,3 +249,16 @@ export async function updateStreamParticleLastChildParticle(
     updated_at: serverTimestamp(),
   });
 }
+
+export async function updateStreamPlaybackMarker(
+  docPath: string,
+  humanId: string,
+  playbackPositionAt: Date,
+): Promise<void> {
+  const particleRef = typedDoc(docPath);
+  const markerField = `playback_markers.${humanId}`;
+  await updateDoc(particleRef, {
+    [markerField]: Timestamp.fromDate(playbackPositionAt),
+    updated_at: serverTimestamp(),
+  });
+}