Get Migration ID programmatically?

How can I programmatically get the Migration ID from my validator node?

The Migration ID is included in the GET response of /v0/scan-proxy/dso of the Scan Proxy API:

curl --silent \
  http://wallet.localhost:2000/api/validator/v0/scan-proxy/dso \
  --header 'Authorization: Bearer eyJhbGciOi...' \
  | jq --raw-output '.sv_node_states[0].contract.payload.state.synchronizerNodes[0][1].sequencer.migrationId'

Since major upgrades now happen through Logical Synchronizer Upgrades (LSUs) instead of hard migrations, the migration ID won’t change again. On MainNet it’s 4 and will stay 4, so the simplest and most stable approach is to hard-code it.

The value differs by network:

• MainNet: 4, permanently (MainNet is never reset).

• DevNet and TestNet: currently 1. It could go back to 0 if those networks are ever reset, but that hasn’t been decided.