fix(data): add missing data attributes query PE-2810

Whoops! I neglected to add this in an earlier commit.

src/database/sql/core/data-attributes.sql

@@ -0,0 +1,12 @@
+-- selectDataAttributes
+SELECT *
+FROM (
+  SELECT data_size, content_type, true AS stable
+  FROM stable_transactions
+  WHERE id = @id
+  UNION
+  SELECT data_size, content_type, true AS stable
+  FROM new_transactions
+  WHERE id = @id
+)
+LIMIT 1