Registrants table or # of registrants not updated for some contests

[SathyaJayabal]

On accessing the above challenge again and clicking on register, the user was able to register and the register button changed to unregister. But the registration tab is not displayed nor is the number of registrants updated on the listings page. This issue is happening only for few contests. Example:
https://beta-community-app.topcoder.com/challenges/d06475ea-8b93-4998-820c-d55a96d16972
https://beta-community-app.topcoder.com/challenges/0084eae1-4eb9-4def-bf53-e39f13b6d12b

[SathyaJayabal]

This seems like a data sync issue. When I register/unregister to a challenge whose registrants have not yet been migrated/synced , the V4 registrations are synced and I can see the table of registrants. And registrations work as expected.The registrants count is also updated on the listings page. This should be fixed when the registrations are synced with V4.
topcoder-platform/challenge-api#165

Please see video.

registration sync.mov.zip
Before Sync

After sync

[rootelement]

This should be fixed as of Sunday Night with the updated sync. If you're seeing issues here, please link Challenge UUIDs and/or LegacyIDs. The issue was the sync was not updating the numberOfRegistrants and numberOfSubmissions counts when data was brought forward, but if you register for a challenge, that would trigger the ES processor which does update those counts. So you wouldn't see it at first, but then it's properly calculated. Please retest.

[SathyaJayabal]

@rootelement , there are a few registrations that are not synced.

For example
https://www.topcoder.com/challenges/30130750?tab=registrants
https://beta-community-app.topcoder.com/challenges/d06475ea-8b93-4998-820c-d55a96d16972?tab=registrants

the last few registrations are not synced.

[SathyaJayabal]

Another example @rootelement :
https://www.topcoder.com/challenges/30131891?tab=registrants
https://beta-community-app.topcoder.com/challenges/dd6b3627-f720-4868-8a84-ee0c85a154a9
Even after registering to this challenge the counts are not updated.

registration.mov.zip

[rootelement]

All examples here line up for me @SathyaJayabal. Please review.

[SathyaJayabal]

@rootelement , the registrations are lining up when you run the migration script, but the real time sync is not happening as expected. For the above example: two more users registered after you last checked. This must have been synced realtime(with a lag if 1-5 mins). But as you can see these have not been synced to v5.

[SathyaJayabal]

This one is tracked here. Closing this as no FE updates needed.
cc @sushilshinde @lakshmiathreya
topcoder-platform/challenge-api#201