refactor(series): extract loadPublicSeries helper

server/api/series/[id].get.js

@@ -1,5 +1,5 @@
 import Event from "../../models/event.js";
-import Series from "../../models/series.js";
+import { loadPublicSeries } from "../../utils/loadSeries.js";
 import { connectDB } from "../../utils/mongoose.js";
 
 export default defineEventHandler(async (event) => {
@@ -15,16 +15,14 @@ export default defineEventHandler(async (event) => {
       });
     }
 
-    // Try to fetch the Series model first for full ticketing info
-    // Build query conditions based on whether id looks like ObjectId or string
-    const isObjectId = /^[0-9a-fA-F]{24}$/.test(id);
-    const seriesQuery = isObjectId
-      ? { $or: [{ _id: id }, { id: id }, { slug: id }] }
-      : { $or: [{ id: id }, { slug: id }] };
-
-    const seriesModel = await Series.findOne(seriesQuery)
-      .select("-registrations") // Don't expose registration details
-      .lean();
+    // Try to fetch the Series model first for full ticketing info.
+    // Legacy series may exist only as event metadata (no Series doc), so we
+    // fall through to the events-based path below when no Series doc matches.
+    const seriesModel = await loadPublicSeries(event, id, {
+      select: "-registrations", // Don't expose registration details
+      lean: true,
+      allowMissing: true,
+    });
 
     // Fetch all events in this series
     const events = await Event.find({