davidjumani commented on a change in pull request #5565:
URL: https://github.com/apache/cloudstack/pull/5565#discussion_r726014976



##########
File path: 
engine/schema/src/main/resources/META-INF/db/schema-41520to41600-cleanup.sql
##########
@@ -19,4 +19,4 @@
 -- Schema upgrade cleanup from 4.15.2.0 to 4.16.0.0
 --;
 
-ALTER TABLE `cloud`.`ssh_keypairs` MODIFY COLUMN `uuid` varchar(40) NOT NULL 
UNIQUE;

Review comment:
       @weizhouapache 
   ```
   UPDATE `cloud`.`ssh_keypairs` SET `uuid`=UUID() WHERE `uuid` IS NULL;
   ``` 
   Will add the same UUID to every key
   
   
https://github.com/apache/cloudstack/blob/main/engine/schema/src/main/java/com/cloud/upgrade/dao/Upgrade41520to41600.java#L77
 should fix this issue
   
   @rhtyd Unique constraint can still let null values exist, but should not be 
an issue because of 
https://github.com/apache/cloudstack/blob/main/engine/schema/src/main/java/com/cloud/upgrade/dao/Upgrade41520to41600.java#L73
    




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