feat: add attendee data to CSV export with seated event support (#21842)

* feat: add attendee data to CSV export with seated event support

- Add up to 3 attendees to CSV export in 'name (email)' format
- Use booking.seatsReferences for seated events, booking.attendees for regular events
- Maintain backward compatibility with existing bookerEmail/bookerName fields
- Add attendee1, attendee2, attendee3 columns to CSV output

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

* fix: restore missing comment as requested in PR review

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

* Update packages/features/insights/server/events.ts

* feat: remove duplicate booker columns from CSV export

- Remove bookerEmail and bookerName columns as they duplicate attendee data
- Remove noShowGuest field which was based on booker data
- Remove unused booker field from bookingMap
- Keep only attendee1, attendee2, attendee3 columns with name (email) format

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

* feat: restore noShowGuest field to CSV export

- Add noShowGuest field mapping from first attendee's noShow property
- Maintain existing attendee1, attendee2, attendee3 columns
- Default to false when no attendees exist
- Works with both seated events and regular events

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

* rename column

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: eunjae@cal.com <hey@eunjae.dev>

packages/features/insights/server/events.ts

@@ -462,28 +462,73 @@ class EventsInsights {
             noShow: true,
           },
         },
+        seatsReferences: {
+          select: {
+            attendee: {
+              select: {
+                name: true,
+                email: true,
+                noShow: true,
+              },
+            },
+          },
+        },
       },
     });
 
-    const bookingMap = new Map(bookings.map((booking) => [booking.uid, booking.attendees[0] || null]));
+    const bookingMap = new Map(
+      bookings.map((booking) => {
+        const attendeeList =
+          booking.seatsReferences.length > 0
+            ? booking.seatsReferences.map((ref) => ref.attendee)
+            : booking.attendees;
+
+        const formattedAttendees = attendeeList
+          .slice(0, 3)
+          .map((attendee) => (attendee ? `${attendee.name} (${attendee.email})` : null));
+
+        return [
+          booking.uid,
+          {
+            noShowGuest: attendeeList[0]?.noShow || false,
+            attendee1: formattedAttendees[0] || null,
+            attendee2: formattedAttendees[1] || null,
+            attendee3: formattedAttendees[2] || null,
+          },
+        ];
+      })
+    );
 
     const data = csvData.map((bookingTimeStatus) => {
       if (!bookingTimeStatus.uid) {
         // should not be reached because we filtered above
-        return bookingTimeStatus;
+        return {
+          ...bookingTimeStatus,
+          noShowGuest: false,
+          attendee1: null,
+          attendee2: null,
+          attendee3: null,
+        };
       }
 
-      const booker = bookingMap.get(bookingTimeStatus.uid);
+      const attendeeData = bookingMap.get(bookingTimeStatus.uid);
 
-      if (!booker) {
-        return bookingTimeStatus;
+      if (!attendeeData) {
+        return {
+          ...bookingTimeStatus,
+          noShowGuest: false,
+          attendee1: null,
+          attendee2: null,
+          attendee3: null,
+        };
       }
 
       return {
         ...bookingTimeStatus,
-        noShowGuest: booker.noShow,
-        bookerEmail: booker.email,
-        bookerName: booker.name,
+        noShowGuest: attendeeData.noShowGuest,
+        attendee1: attendeeData.attendee1,
+        attendee2: attendeeData.attendee2,
+        attendee3: attendeeData.attendee3,
       };
     });