From ffb210babbca73a25fb36f7dfb3d7db7e6d9c676 Mon Sep 17 00:00:00 2001
From: Bill Thiede <git@xinu.tv>
Date: Wed, 25 Dec 2024 08:02:36 -0800
Subject: [PATCH] server: ensure uniqueness on post links

---
 .../20241225054216_post-link-unique.down.sql  |  3 ++
 .../20241225054216_post-link-unique.up.sql    | 28 +++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 server/migrations/20241225054216_post-link-unique.down.sql
 create mode 100644 server/migrations/20241225054216_post-link-unique.up.sql

diff --git a/server/migrations/20241225054216_post-link-unique.down.sql b/server/migrations/20241225054216_post-link-unique.down.sql
new file mode 100644
index 0000000..810bde0
--- /dev/null
+++ b/server/migrations/20241225054216_post-link-unique.down.sql
@@ -0,0 +1,3 @@
+-- Add down migration script here
+ALTER TABLE
+    post DROP CONSTRAINT post_link_key;
diff --git a/server/migrations/20241225054216_post-link-unique.up.sql b/server/migrations/20241225054216_post-link-unique.up.sql
new file mode 100644
index 0000000..aeb407b
--- /dev/null
+++ b/server/migrations/20241225054216_post-link-unique.up.sql
@@ -0,0 +1,28 @@
+WITH dupes AS (
+    SELECT
+        uid,
+        link,
+        Row_number() over(
+            PARTITION by link
+            ORDER BY
+                link
+        ) AS RowNumber
+    FROM
+        post
+)
+DELETE FROM
+    post
+WHERE
+    uid IN (
+        SELECT
+            uid
+        FROM
+            dupes
+        WHERE
+            RowNumber > 1
+    );
+
+ALTER TABLE
+    post
+ADD
+    UNIQUE (link);