# Updating a custom Integration app - what happens to existing and deleted entities?

**URL:** <https://community.fibery.io/t/updating-a-custom-integration-app-what-happens-to-existing-and-deleted-entities/5416>\
**Category:** Get Help\
**Tags:** integration\
**Created:** [November 16, 2023, 5:54pm UTC](https://community.fibery.io/t/updating-a-custom-integration-app-what-happens-to-existing-and-deleted-entities/5416 "2023-11-16T17:54:48Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Matt\_Blais](https://sea2.discourse-cdn.com/flex020/user_avatar/community.fibery.io/matt_blais/32/1464_2.png) [@Matt\_Blais](https://community.fibery.io/u/Matt_Blais)\
**Post date:** [November 27, 2023, 4:01am UTC](https://community.fibery.io/t/updating-a-custom-integration-app-what-happens-to-existing-and-deleted-entities/5416/2 "2023-11-27T04:01:05Z")

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@Polina_Zenevich  
Here is another question about **updating a Custom Integration:**

When my Custom integration is updated in Fibery, will the value of “[lastSynchronizedAt](https://api.fibery.io/apps.html#post-api-v1-synchronizer-data)” that is passed to the integration app be reset?

This is important to know, because my custom integration uses “lastSynchronizedAt” to limit the records it queries from my data source (Zoho CRM).

If “lastSynchronizedAt” is reset by Fibery for any reason, then my CI app will begin retrieving much older records which were last synchronized long ago.

This could potentially result in old Fibery entities that were manually deleted being recreated by the sync.

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_[View the full topic](https://community.fibery.io/t/updating-a-custom-integration-app-what-happens-to-existing-and-deleted-entities/5416)._