fix: Fix booking count discrepancy between KPI cards and trends chart (calcom#23619)

* fix: correct booking count in EventTrendsChart by restructuring SQL query

- Replace JOIN-based query with CTE approach to count distinct bookings
- Separate booking stats from guest stats to prevent duplicate counting
- Preserve no-show guest functionality with LEFT JOIN
- Ensure EventTrendsChart 'Created' sum matches BookingKPICards 'events_created'

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

* fix: use positional GROUP BY references to resolve PostgreSQL error

- Replace column expressions in GROUP BY with positional references (1, 2, 3)
- Fixes PostgreSQL error 42803 caused by parameter resolution in CTE queries
- Maintains the same query logic while avoiding column reference conflicts

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

* address feedback

---------

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

Author: eunjae-lee

packages/lib/server/service/InsightsBookingBaseService.ts

@@ -650,31 +650,42 @@ export class InsightsBookingBaseService {
         noShowGuests: number;
       }[]
     >`
-    SELECT
-      "date",
-      CAST(COUNT(*) AS INTEGER) AS "bookingsCount",
-      CAST(COUNT(CASE WHEN "isNoShowGuest" = true THEN 1 END) AS INTEGER) AS "noShowGuests",
-      "timeStatus",
-      "noShowHost"
-    FROM (
+    WITH booking_stats AS (
       SELECT
         DATE("createdAt" AT TIME ZONE ${timeZone}) as "date",
-        "a"."noShow" AS "isNoShowGuest",
         "timeStatus",
-        "noShowHost"
-      FROM
-        "BookingTimeStatusDenormalized"
-      JOIN
-        "Attendee" "a" ON "a"."bookingId" = "BookingTimeStatusDenormalized"."id"
-      WHERE
-        ${baseConditions}
-    ) AS bookings
-    GROUP BY
-      "date",
-      "timeStatus",
-      "noShowHost"
-    ORDER BY
-      "date"
+        COALESCE("noShowHost", false) AS "noShowHost",
+        COUNT(*) as "bookingsCount"
+      FROM "BookingTimeStatusDenormalized"
+      WHERE ${baseConditions}
+      GROUP BY
+        1, 2, 3
+    ),
+    guest_stats AS (
+      SELECT
+        DATE(b."createdAt" AT TIME ZONE ${timeZone}) as "date",
+        b."timeStatus",
+        COALESCE(b."noShowHost", false) AS "noShowHost",
+        COUNT(CASE WHEN a."noShow" = true THEN 1 END) as "noShowGuests"
+      FROM "BookingTimeStatusDenormalized" b
+      INNER JOIN "Attendee" a ON a."bookingId" = b.id
+      WHERE ${baseConditions}
+      GROUP BY
+        1, 2, 3
+    )
+    SELECT
+      bs."date",
+      CAST(bs."bookingsCount" AS INTEGER) AS "bookingsCount",
+      bs."timeStatus",
+      bs."noShowHost",
+      CAST(COALESCE(gs."noShowGuests", 0) AS INTEGER) AS "noShowGuests"
+    FROM booking_stats bs
+    LEFT JOIN guest_stats gs ON (
+      bs."date" = gs."date" AND
+      bs."timeStatus" = gs."timeStatus" AND
+      bs."noShowHost" = gs."noShowHost"
+    )
+    ORDER BY bs."date"
   `;
 
     // Initialize aggregate object with zero counts for all date ranges