diff --git a/deploy/db/spec_events.py b/deploy/db/spec_events.py
index e23081e..e99d052 100644
--- a/deploy/db/spec_events.py
+++ b/deploy/db/spec_events.py
@@ -45,7 +45,7 @@ def apply_ops(contract_id, supplement_id, document_id, ops, prompt_id, raw_llm_r
         if action == "ADD":
             nr = op.get("new_row", {})
             name = nr.get("name", "")
-            name_hash = _hash(name)
+            name_hash = _hash(name, nr.get("date_start"))
             execute(
                 """INSERT INTO spec_events (contract_id, supplement_id, seq, action, target_hash,
                    new_values, comment, status, prompt_version, source_document_id, raw_llm_response)
@@ -116,9 +116,13 @@ def apply_ops(contract_id, supplement_id, document_id, ops, prompt_id, raw_llm_r
     return {"added": added, "updated": updated, "deleted": deleted}
 
 
-def _hash(name):
+def _hash(name, date_start=None):
+    """Нормализованный хеш услуги. Включает date_start чтобы различать периоды."""
     import hashlib
-    return hashlib.sha256(name.strip().lower().encode()).hexdigest()[:16]
+    key = name.strip().lower()
+    if date_start:
+        key += "|" + str(date_start)
+    return hashlib.sha256(key.encode()).hexdigest()[:16]
 
 
 def _upsert_spec_current(contract_id, name_hash, row):