Sources Versions

Return the resolved version index for a given monarch-kg release.

Default is the release this API was built against (the MONARCH_KG_VERSION env var, surfaced in /version), so the receipt reflects the bytes actually in the deployed Solr/DuckDB. Falls back to latest when the env var is unset. Specific dates (2026-05-07) are also accepted for retrospective lookups. Pass dev=true to read from monarch-kg-dev/; otherwise the deployment-wide default applies (set via the MONARCH_KG_USE_DEV env var, default false).