fix: migrations to make it postgresql compatible.

[qasimgulzar]

No description provided.

[openedx-webhooks]

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[qasimgulzar]

@ormsbee could you please approve the workflow execution?

[ormsbee]

@qasimgulzar: @iloveagent57 said that he could take a look at this one.

[mphilbrick211]

@qasimgulzar - just flagging some failing checks here.

[qasimgulzar]

I will take care of it