diff --git a/migrations/2025_10_22_235100_add_transfer_data_to_queries.py b/migrations/2025_10_22_235100_add_transfer_data_to_queries.py
new file mode 100644
index 0000000..818e5be
--- /dev/null
+++ b/migrations/2025_10_22_235100_add_transfer_data_to_queries.py
@@ -0,0 +1,11 @@
+from __future__ import annotations
+
+from config import CONFIG
+from eloquent import DatabaseManager, Schema
+
+DB = DatabaseManager (CONFIG)
+SCHEMA = Schema (DB)
+
+
+with SCHEMA.table ('queries') as t:
+    t.json ('transfer_data').nullable ().default (None).comment ('受渡しデータ')
diff --git a/models.py b/models.py
index f832932..2ec8270 100644
--- a/models.py
+++ b/models.py
@@ -32,11 +32,11 @@ class Answer (Model):
 
     __timestamps__ = False
 
-    @property
+    @belongs_to ('query_id')
     def query_rel (
             self,
-    ) -> Query:
-        return self.belongs_to (Query)
+    ) -> type:
+        return Query
 
     @property
     def answered_flags (
@@ -91,11 +91,11 @@ class QueryAnswerHistory (Model):
 
     __timestamps__ = False
 
-    @property
+    @belongs_to ('query_id')
     def query_rel (
             self,
-    ) -> Query:
-        return self.belongs_to (Query)
+    ) -> type:
+        return Query
 
     @property
     def answer (