Partially updates deposit_configs.overrides on an active deposit account attachment using three-state PATCH semantics on every field.

• Omitted: Keeps the current value
• null: Removes the override; falls back through the cascade (program → product)
• Value: Replaces the current override with the supplied value

NOTES:

• The overrides envelope must contain at least one field; sending an empty object returns 400 EIBACC0315.
• renewal_term still requires ROLLOVER configured in maturity_instructions somewhere in the fallback sequence (400 EIBACC0310 otherwise).

This endpoint generates an Account attachment updated event.