feat: high-concurrency userid hashing

utils/export_records.py

@@ -0,0 +1,8 @@
+import polars as pl
+import polars_hash as pl_hash
+
+pl.scan_parquet("records.parquet").with_columns(
+    pl.col("user_id").cast(pl.String).add("Lt2N5xgjJOqRsT5qVt7wWYw6SqOPZDI7")
+).with_columns(pl_hash.col("user_id").chash.sha2_256()).collect().write_parquet(
+    "records_pub.parquet"
+)