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Jamie Pine
800e390108
Routes were calling model_dump(exclude_none=True), which drops every client-sent null before it reaches the service. The service then layered on its own `if value is not None` guard. Net effect: setting a nullable column back to null was a no-op — the MCPPage default-voice picker sends null when the user picks "no default" and the row was silently keeping whatever was there before. Switched the routes to exclude_unset=True so absent fields stay absent but explicit nulls survive the dump, and centralised the per-field nullability check in the service. The check inspects the SQLAlchemy column metadata so non-nullable columns (stt_model, llm_model, the chord key lists) still drop nulls instead of crashing the request, while default_playback_voice_id can finally be cleared.