Function upsert_tx 

pub async fn upsert_tx(
    tx: &mut Transaction<'_, Postgres>,
    def: &ViewDefinition,
    definition_sql: &str,
    updated_by: &str,
) -> Result<(), Error>

Inserts a new row, or – on a name collision – updates every column including updated_at/ updated_by explicitly: the column defaults only fire on INSERT, and reload()’s digest is over (view_set_name, updated_at), so a REPLACE that left it unset would go live only on the replacing node while every other replica kept serving/materializing the old definition.