1 files changed, 18 insertions, 0 deletions
diff --git a/db/post_migrate/20230904100544_drop_index_deployments_on_id_where_cluster_id_present.rb b/db/post_migrate/20230904100544_drop_index_deployments_on_id_where_cluster_id_present.rb
new file mode 100644
index 00000000000..888fb7da9c3
--- /dev/null
+++ b/db/post_migrate/20230904100544_drop_index_deployments_on_id_where_cluster_id_present.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class DropIndexDeploymentsOnIdWhereClusterIdPresent < Gitlab::Database::Migration[2.1]
+  INDEX_NAME = 'index_deployments_on_id_where_cluster_id_present'
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index_by_name :deployments, name: INDEX_NAME
+  end
+
+  def down
+    # This is based on the following `CREATE INDEX` command in db/init_structure.sql:
+    # CREATE INDEX index_deployments_on_id_where_cluster_id_present ON deployments
+    #   USING btree (id) WHERE (cluster_id IS NOT NULL);
+    add_concurrent_index :deployments, :id, name: INDEX_NAME, where: 'cluster_id IS NOT NULL'
+  end
+end