fix : fix migration script

Author: Tushar504

migrations/tenant/0035-note-teams@add-unique-index-on-note-and-user-id.sql

@@ -1,2 +1,19 @@
+-- remove exists duplicate entries from database
+DELETE FROM note_teams
+WHERE id IN (
+  SELECT id
+  FROM (
+    SELECT 
+      id,
+      ROW_NUMBER() OVER (
+        PARTITION BY note_id, user_id 
+        ORDER BY id
+      ) AS row_num
+    FROM note_teams
+  ) AS duplicates
+  WHERE duplicates.row_num > 1
+);
+
+-- adds unique index
 CREATE UNIQUE INDEX IF NOT EXISTS note_teams_note_id_user_id_unique_idx
 ON public.note_teams (note_id, user_id);