feat: export regions

utils/export_regions.py

@@ -0,0 +1,7 @@
+import polars as pl
+
+from hasher import salted_hash_userid
+
+pl.scan_parquet("regions.parquet").with_columns(
+    pl.col("user_id").map_elements(salted_hash_userid, return_dtype=pl.String)
+).collect().write_parquet("regions_pub.parquet")