diff --git a/pyproject.toml b/pyproject.toml
index df5000d..1427555 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,8 +5,10 @@ description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
+    "diskcache>=5.6.3",
     "loguru>=0.7.3",
     "orjson>=3.11.1",
     "polars>=1.32.0",
+    "polars-hash>=0.5.4",
     "pyecharts>=2.0.8",
 ]
diff --git a/utils/export_records.py b/utils/export_records.py
new file mode 100644
index 0000000..e0f6fa7
--- /dev/null
+++ b/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"
+)
diff --git a/utils/export_regions.py b/utils/export_regions.py
index 4f5e3f7..086b57b 100644
--- a/utils/export_regions.py
+++ b/utils/export_regions.py
@@ -1,7 +1,8 @@
 import polars as pl
-
-from helpers import salted_hash_userid
+import polars_hash as pl_hash
 
 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")
+    pl.col("user_id").cast(pl.String).add("Lt2N5xgjJOqRsT5qVt7wWYw6SqOPZDI7")
+).with_columns(pl_hash.col("user_id").chash.sha2_256()).collect().write_parquet(
+    "regions_pub.parquet"
+)
diff --git a/utils/helpers.py b/utils/helpers.py
index 1e55168..80cedce 100644
--- a/utils/helpers.py
+++ b/utils/helpers.py
@@ -2,15 +2,25 @@ from decimal import Decimal, getcontext
 import hashlib
 
 import orjson as json
+from diskcache import Cache
 
 getcontext().prec = 28
 
+CACHE = Cache("target")
+
 
 def salted_hash_userid(user_id: int):
+    hex = CACHE.get(user_id)
+    if hex is not None:
+        return hex
+
     SALT = b"Lt2N5xgjJOqRsT5qVt7wWYw6SqOPZDI7"
 
     hash_uid = hashlib.sha256(f"{user_id}".encode("utf-8") + SALT)
-    return hash_uid.hexdigest()[:16]
+    result = hash_uid.hexdigest()[:16]
+
+    CACHE.add(user_id, result)
+    return result
 
 
 def dx_rating(difficulty: Decimal, achievement: int) -> int: