• Currently, setting a vanity url on a server with no or more than one invite fails due either a logical error or PRIMARY key constraints when trying to update previous invite links. This PR deletes previous vanity URLs (normal invite links aren't affected) and inserts the new one.
• flags has no default value, so it has to be set to 0 (default from channel invite create endpoint¹)
• Removed expires_at: new Date(), to be consistent with channel invite create endpoint²
• typeorm is unintuitive (when specifying select, it only selects those properties and uses the default for all others) so I broke widget.json in Fix widget.json & fix channel ordering when deleting channels #1184. This PR adds the required properties to the requested ones.

References

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