GIAS grid references are the actual school location — far more accurate
than postcode centroids. Remove geocode_postcodes.py from the daily DAG
and the postcode-not-null filter from dim_location.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Convert GIAS British National Grid coordinates (EPSG:27700) to WGS84
(EPSG:4326) directly in the dbt model. The geocode script backfills
schools missing easting/northing via Postcodes.io.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>