Function store_output_item 

pub(super) async fn store_output_item(
    conn: &mut PgConnection,
    item: OutputItem,
    conversation_id: Uuid,
    app_config: &ApplicationConfiguration,
) -> ChatbotResult<ChatbotConversationMessage>

Persists a round item that isn’t a text Message or FunctionCall: Reasoning and AzureAiSearchCall insert as-is, a refusal Message inserts as-is, and an AzureAiSearchCallOutput additionally resolves its cited documents (see store_search_output_with_citations for why that half alone swallows its errors). Errors on a text Message, FunctionCall or FunctionCallOutput — see storage_plan.