diff --git a/migrations/000.216.sql b/migrations/000.216.sql
new file mode 100644
index 0000000..b74719c
--- /dev/null
+++ b/migrations/000.216.sql
@@ -0,0 +1,18 @@
+-- P5-5460: add unique contraint on article_id, market_id
+
+-- remove duplicates
+
+DELETE FROM article_content WHERE id IN (
+    152,
+    1916,
+    4255,
+    1054,
+    4320,
+    623,
+    2121,
+    3214,
+    2889
+);
+
+ALTER TABLE article_content
+ADD UNIQUE (article_id, market_id);