Remove unnecessary index on cluster_agent_tokens

This index has been replaced by
index_cluster_agent_tokens_on_agent_id_status_last_used_at

Changelog: other

db/post_migrate/20220117034056_remove_index_cluster_agent_tokens_on_agent_id_and_last_used_at.rb

+# frozen_string_literal: true
+
+class RemoveIndexClusterAgentTokensOnAgentIdAndLastUsedAt < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  INDEX = 'index_cluster_agent_tokens_on_agent_id_and_last_used_at'
+
+  def up
+    remove_concurrent_index_by_name :cluster_agent_tokens, name: INDEX
+  end
+
+  def down
+    add_concurrent_index :cluster_agent_tokens, 'agent_id, last_used_at DESC NULLS LAST', name: INDEX
+  end
+end

db/schema_migrations/20220117034056

+afc54500374602edcdc4fce5acf3673b84882da1afbb5598a6684a5ef480a2d7
\ No newline at end of file

db/structure.sql

@@ -25787,8 +25787,6 @@ CREATE INDEX index_ci_variables_on_key ON ci_variables USING btree (key);
 
 CREATE UNIQUE INDEX index_ci_variables_on_project_id_and_key_and_environment_scope ON ci_variables USING btree (project_id, key, environment_scope);
 
-CREATE INDEX index_cluster_agent_tokens_on_agent_id_and_last_used_at ON cluster_agent_tokens USING btree (agent_id, last_used_at DESC NULLS LAST);
-
 CREATE INDEX index_cluster_agent_tokens_on_agent_id_status_last_used_at ON cluster_agent_tokens USING btree (agent_id, status, last_used_at DESC NULLS LAST);
 
 CREATE INDEX index_cluster_agent_tokens_on_created_by_user_id ON cluster_agent_tokens USING btree (created_by_user_id);