From 61a12b96344636cef8fc403a7237a2155a20ea3e Mon Sep 17 00:00:00 2001
From: Jan Nidzwetzki <jan@timescale.com>
Date: Fri, 8 Mar 2024 10:17:48 +0100
Subject: [PATCH] Remove autovacuum setting from compressed chunks

In old TSDB versions, we disabled autovacuum for compressed chunks to
keep the statistics. However, this restriction was removed in #5118, but
no migration was performed to reset the custom autovacuum for existing
chunks.
---
 .unreleased/bugfix_6752    |  1 +
 sql/updates/latest-dev.sql | 18 +++++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 .unreleased/bugfix_6752

diff --git a/.unreleased/bugfix_6752 b/.unreleased/bugfix_6752
new file mode 100644
index 00000000000..a17b3cc0629
--- /dev/null
+++ b/.unreleased/bugfix_6752
@@ -0,0 +1 @@
+Fixes: #6752 Remove custom autovacuum setting from compressed chunks
diff --git a/sql/updates/latest-dev.sql b/sql/updates/latest-dev.sql
index 6ba3ab3ad6e..caf95e42211 100644
--- a/sql/updates/latest-dev.sql
+++ b/sql/updates/latest-dev.sql
@@ -161,4 +161,20 @@ DROP FUNCTION IF EXISTS _timescaledb_functions.get_chunk_colstats;
 DROP FUNCTION IF EXISTS _timescaledb_internal.get_chunk_relstats;
 DROP FUNCTION IF EXISTS _timescaledb_internal.get_chunk_colstats;
 
-
+-- In older TSDB versions, we disabled autovacuum for compressed chunks
+-- to keep the statistics. However, this restriction was removed in
+-- #5118 but no migration was performed to remove the custom
+-- autovacuum setting for existing chunks.
+DO $$
+DECLARE
+  chunk regclass;
+BEGIN
+  FOR chunk IN
+  SELECT format('%I.%I', schema_name, table_name)::regclass
+    FROM _timescaledb_catalog.chunk WHERE compressed_chunk_id IS NOT NULL
+  LOOP
+    EXECUTE format('ALTER TABLE %s RESET (autovacuum_enabled);', chunk::text);
+  END LOOP;
+END
+$$;
+DO