chore(db): avoid warning on running migration

[imnotjames]

Description

when running all of the migrations a warning occurs

DB: Name 'pk_kobo_span_map' ignored for PRIMARY key.

Linked Issue

N/A

Changes

Removes CONSTRAINT name portion of the primary key definition.

Manual Testing Steps

Screenshots (Optional)

Additional Context (Optional)

AI Disclosure

Checklist

• This PR links and implements an accepted issue.
• This PR is a single focused change.
• There are new or updated tests validating this change.
• I ran just ui check and just api check.
• I have added screenshots if there were any UI changes.
• I have disclosed any AI usage as per the organization AI Policy above.
• I understand all of my submitted changes.

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