nvazquez commented on a change in pull request #5565:
URL: https://github.com/apache/cloudstack/pull/5565#discussion_r726072928



##########
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;
\ No newline at end of file
+ALTER TABLE `cloud`.`ssh_keypairs` ADD CONSTRAINT `uc_ssh_keypairs__uuid` 
UNIQUE (`uuid`);

Review comment:
       It is added in the cleanup file as the UUID generation for sshkeypairs 
is handled in the java code por the upgrade path. See: 
https://github.com/apache/cloudstack/pull/5103/commits/7c7925edb12ab670dbe5e018d0ada36c616bd0a7#diff-06996fafc77d65da40b9caead01b27f56da70143795cd7b261840ada0727883bR70.
 It is done like this to avoid a point @davidjumani mentioned above, to avoid 
the case in which all the keypairs will get the same UUID




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