start_block config for cardano_node source

[tdedgx]

start_block was getting ignored for cardano_node source? check for the config, otherwise use latest from db.

Not tested with Oura as the source

[SebastienGllmt]

This feels reasonable to me, but maybe @gostkin you can check

[gostkin]

sink.start_from should be called anyway. doesn't matter if start_from is None. otherwise genesis data won't be processed

[gostkin]

carp/indexer/src/sinks/cardano.rs

Lines 131 to 134 in 26c085b

	if start.is_empty() {
	genesis::process_genesis(&self.db, &self.network, self.exec_plan.clone()).await?;
	return self.get_latest_point().await;
	}