Add db index for post.url column (#2929)

* Add db index for post.url column

As mentioned in https://github.com/LemmyNet/lemmy/issues/2877#issuecomment-1576439829

Not sure if its preferable to do this, or make a combined index
which includes post.nsfw, post.removed, post.deleted

* remove unique

diff --git a/migrations/2023-06-06-104440_index_post_url/down.sql b/migrations/2023-06-06-104440_index_post_url/down.sql
new file mode 100644 (file)
index 0000000..5a60b13
--- /dev/null
+++ b/migrations/2023-06-06-104440_index_post_url/down.sql
@@ -0,0 +1 @@
+drop index idx_post_url;

diff --git a/migrations/2023-06-06-104440_index_post_url/up.sql b/migrations/2023-06-06-104440_index_post_url/up.sql
new file mode 100644 (file)
index 0000000..4f8ea66
--- /dev/null
+++ b/migrations/2023-06-06-104440_index_post_url/up.sql
@@ -0,0 +1 @@
+create index idx_post_url on post(url);