1 files changed, 39 insertions, 0 deletions
diff --git a/db/post_migrate/20230214174335_prepare_async_index_web_hook_logs.rb b/db/post_migrate/20230214174335_prepare_async_index_web_hook_logs.rb
new file mode 100644
index 00000000000..536f0750b91
--- /dev/null
+++ b/db/post_migrate/20230214174335_prepare_async_index_web_hook_logs.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+class PrepareAsyncIndexWebHookLogs < Gitlab::Database::Migration[2.1]
+  include Gitlab::Database::PartitioningMigrationHelpers
+
+  disable_ddl_transaction!
+
+  INDEX_NAME = 'index_web_hook_logs_on_web_hook_id_and_created_at'
+
+  def up
+    # Since web_hook_logs is a partitioned table, we need to prepare the index
+    # for each partition individually. We can't use the `prepare_async_index`
+    # method directly because it will try to prepare the index for the whole
+    # table, which will fail.
+
+    # In a future migration, we will create the index on the parent table itself.
+    each_partition(:web_hook_logs) do |partition, partition_index_name|
+      prepare_async_index(partition.identifier, [:web_hook_id, :created_at],
+        name: partition_index_name)
+    end
+  end
+
+  def down
+    each_partition(:web_hook_logs) do |partition, partition_index_name|
+      unprepare_async_index_by_name(partition.identifier, partition_index_name)
+    end
+  end
+
+  private
+
+  def each_partition(table_name)
+    partitioned_table = find_partitioned_table(table_name)
+    partitioned_table.postgres_partitions.order(:name).each do |partition|
+      partition_index_name = generated_index_name(partition.identifier, INDEX_NAME)
+
+      yield partition, partition_index_name
+    end
+  end
+end