fix: add migration to backfill BookingDenormalized (calcom#21420)

Author: eunjae-lee

packages/prisma/migrations/20250520143014_booking_denormalized_backfill/migration.sql

@@ -0,0 +1,54 @@
+DO $$
+DECLARE
+    chunk_size INTEGER := 1000;
+    start_id INTEGER := 1;      -- Starting ID
+    end_id INTEGER;             -- Will be set dynamically
+    current_id INTEGER;
+    sleep_interval FLOAT := 1;  -- Sleep duration in seconds
+    missing_records_exist BOOLEAN;
+BEGIN
+    -- Get the maximum ID from the Booking table
+    SELECT COALESCE(MAX(id), 0) INTO end_id FROM "Booking";
+
+    FOR current_id IN SELECT * FROM generate_series(start_id, end_id, chunk_size)
+    LOOP
+        -- Check if there are any Booking records that don't exist in BookingDenormalized
+        SELECT EXISTS (
+            SELECT 1
+            FROM "Booking" b
+            LEFT JOIN "BookingDenormalized" bd ON b.id = bd.id
+            WHERE b.id BETWEEN current_id AND current_id + chunk_size - 1
+            AND bd.id IS NULL
+        ) INTO missing_records_exist;
+
+        -- Only proceed with INSERT if there are actually missing records
+        IF missing_records_exist THEN
+            INSERT INTO "BookingDenormalized" (
+                id, uid, "eventTypeId", title, description, "startTime", "endTime",
+                "createdAt", "updatedAt", location, paid, status, rescheduled,
+                "userId", "teamId", "eventLength", "eventParentId", "userEmail",
+                "userUsername", "ratingFeedback", rating, "noShowHost",
+                "isTeamBooking"
+            )
+            SELECT
+                b.id, b.uid, b."eventTypeId", b.title, b.description,
+                b."startTime", b."endTime", b."createdAt", b."updatedAt",
+                b.location, b.paid, b.status, b.rescheduled, b."userId",
+                et."teamId", et.length as "eventLength",
+                et."parentId" as "eventParentId", u.email as "userEmail",
+                u.username as "userUsername", b."ratingFeedback", b.rating,
+                b."noShowHost",
+                COALESCE(et."teamId", 0) > 0 as "isTeamBooking"
+            FROM "Booking" b
+            LEFT JOIN "EventType" et ON b."eventTypeId" = et.id
+            LEFT JOIN "users" u ON u.id = b."userId"
+            WHERE b.id BETWEEN current_id AND current_id + chunk_size - 1
+            AND NOT EXISTS (
+                SELECT 1 FROM "BookingDenormalized" bd WHERE bd.id = b.id
+            )
+            ON CONFLICT (id) DO NOTHING;
+        END IF;
+
+        PERFORM pg_sleep(sleep_interval);  -- Using the declared sleep_interval
+    END LOOP;
+END $$;