From 1e036ba3ae1460ca033c4737d16d608f7952526c Mon Sep 17 00:00:00 2001
From: Jader Santos <msantos.jader@gmail.com>
Date: Fri, 21 Nov 2025 22:09:15 -0300
Subject: [PATCH] fix(migration): add deduplication step before creating index

---
 .../migration.sql                                | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/prisma/postgresql-migrations/20251122003044_add_chat_instance_remotejid_unique/migration.sql b/prisma/postgresql-migrations/20251122003044_add_chat_instance_remotejid_unique/migration.sql
index 57254901..8b27cc1e 100644
--- a/prisma/postgresql-migrations/20251122003044_add_chat_instance_remotejid_unique/migration.sql
+++ b/prisma/postgresql-migrations/20251122003044_add_chat_instance_remotejid_unique/migration.sql
@@ -1,2 +1,16 @@
--- AlterTable
+-- 1. Cleanup: Remove duplicate chats, keeping the most recently updated one
+DELETE FROM "Chat"
+WHERE id IN (
+  SELECT id FROM (
+    SELECT id,
+           ROW_NUMBER() OVER (
+             PARTITION BY "instanceId", "remoteJid"
+             ORDER BY "updatedAt" DESC
+           ) as row_num
+    FROM "Chat"
+  ) t
+  WHERE t.row_num > 1
+);
+
+-- 2. Create the unique index (Constraint)
 CREATE UNIQUE INDEX "Chat_instanceId_remoteJid_key" ON "Chat"("instanceId", "remoteJid");