diff --git a/corrlib/meas_io.py b/corrlib/meas_io.py
index b8695ca..a78f6f2 100644
--- a/corrlib/meas_io.py
+++ b/corrlib/meas_io.py
@@ -7,7 +7,7 @@ import json
 from typing import Union, Optional
 from pyerrors import Obs, Corr, load_object, dump_object
 from hashlib import sha256, sha1
-from .tools import cached, record2name_key, make_version_hash
+from .tools import cached, record2name_key, name_key2record, make_version_hash
 from .cache_io import is_in_cache, cache_path, cache_dir, get_version_hash
 
 
@@ -82,10 +82,10 @@ def write_measurement(path, ensemble, measurement, uuid, code, parameter_file: O
         meas_paths = []
         for subkey in subkeys:                
             par_hash = sha256(str(pars[subkey]).encode('UTF-8')).hexdigest()
-            meas_path = file_in_archive + "::" + par_hash
+            meas_path = name_key2record(file_in_archive, par_hash)
             meas_paths.append(meas_path)
             known_meas[par_hash] = measurement[corr][subkey]
-            data_hash = sha1(pj.create_json_string(measurement[corr][subkey]).encode('UTF-8')).hexdigest()
+            data_hash = make_version_hash(path, meas_path)
             if c.execute("SELECT * FROM backlogs WHERE path = ?", (meas_path,)).fetchone() is None:
                 c.execute("INSERT INTO backlogs (name, ensemble, code, path, project, parameters, parameter_file, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, datetime('now'))",
                                                 (corr, ensemble, code, meas_path, uuid, pars[subkey], parameter_file))
@@ -140,7 +140,7 @@ def load_records(path: str, record_paths: list[str], preloaded = {}) -> list[Uni
     returned_data: list = []
     for file in needed_data.keys():
         for key in list(needed_data[file]):
-            record = file + "::" + key
+            record = name_key2record(file, key)
             current_version = get_version_hash(path, record)
             if is_in_cache(path, record):
                 returned_data.append(load_object(cache_path(path, file, current_version, key) + ".p"))
@@ -165,10 +165,9 @@ def preload(path: str, file: str):
 
 
 def drop_record(path: str, meas_path: str):
-    file_in_archive = meas_path.split("::")[0]
+    file_in_archive, sub_key = record2name_key(meas_path)
     file = os.path.join(path, file_in_archive)
     db = os.path.join(path, 'backlogger.db')
-    sub_key = meas_path.split("::")[1]
     dl.unlock(db, dataset=path)
     conn = sqlite3.connect(db)
     c = conn.cursor()
diff --git a/corrlib/tools.py b/corrlib/tools.py
index 70eb518..43ab1ba 100644
--- a/corrlib/tools.py
+++ b/corrlib/tools.py
@@ -24,6 +24,10 @@ def record2name_key(record_path: str):
     return file, key
 
 
+def name_key2record(name: str, key: str):
+    return name + "::" + key
+
+
 def make_version_hash(path, record):
     file, key = record2name_key(record)
     with open(os.path.join(path, file), 'rb') as fp: