How often does the Synaxarium get updated?

Tenacpi esna onkh

Are all saints canonized by the Coptic church found in the Synaxarium?

Do we have the saints canonized by other Oriental Orthodox churches too?

For all the saints we have, do we have the first Church built on their name?

based on what we tell the story of a saint, or just tell that we remember his martyrdom in less than 2 line?

Why can deacons do all the liturgical readings, except the Synaxarium by the priest ? (at least that's how we do it on our church)