diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a48d4ae..fdfe6a52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## ChangeLog
 
 --- develop ---
+* bug: Pass a boolean (not the integer `1`) to `api_plugin_register_hook()`'s `$enable` argument so the hook registration stays type-correct under Cacti 1.3's strict `bool $enable` type-hint (the int only coerces while this file lacks `declare(strict_types=1)`)
 * feature: Show each threshold's status as a sortable, clickable pill in a new Status column (right of Name) on the Thresholds and Device Status pages instead of colouring the whole row; rows now zebra-stripe, clicking a pill filters the list to that status, and the Status filter gains per-severity options
 * security: Replace the confirmation pages' inline `onClick='cactiReturnTo()'` Cancel buttons with the CSP-safe `cactiReturnTo` class so they no longer trip Cacti's Content-Security-Policy `script-src-attr` directive
 * security: Move the filter controls' inline `onChange`/`onClick` handlers into jQuery `ready()` event bindings on the threshold, notification list, notification queue, template and device/log status pages so they no longer trip Cacti's Content-Security-Policy `script-src-attr` directive
diff --git a/includes/database.php b/includes/database.php
index 8c270b5d..b5d7b634 100644
--- a/includes/database.php
+++ b/includes/database.php
@@ -250,14 +250,14 @@ function thold_upgrade_database($force = false) {
 			AND hook = "poller_bottom"');
 
 		// Register the new hooks
-		api_plugin_register_hook('thold', 'rrd_graph_graph_options', 'thold_rrd_graph_graph_options', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'graph_buttons', 'thold_graph_button', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'data_source_action_array', 'thold_data_source_action_array', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'data_source_action_prepare', 'thold_data_source_action_prepare', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'data_source_action_execute', 'thold_data_source_action_execute', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'graphs_action_array', 'thold_graphs_action_array', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'graphs_action_prepare', 'thold_graphs_action_prepare', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'graphs_action_execute', 'thold_graphs_action_execute', 'setup.php', '1');
+		api_plugin_register_hook('thold', 'rrd_graph_graph_options', 'thold_rrd_graph_graph_options', 'setup.php', true);
+		api_plugin_register_hook('thold', 'graph_buttons', 'thold_graph_button', 'setup.php', true);
+		api_plugin_register_hook('thold', 'data_source_action_array', 'thold_data_source_action_array', 'setup.php', true);
+		api_plugin_register_hook('thold', 'data_source_action_prepare', 'thold_data_source_action_prepare', 'setup.php', true);
+		api_plugin_register_hook('thold', 'data_source_action_execute', 'thold_data_source_action_execute', 'setup.php', true);
+		api_plugin_register_hook('thold', 'graphs_action_array', 'thold_graphs_action_array', 'setup.php', true);
+		api_plugin_register_hook('thold', 'graphs_action_prepare', 'thold_graphs_action_prepare', 'setup.php', true);
+		api_plugin_register_hook('thold', 'graphs_action_execute', 'thold_graphs_action_execute', 'setup.php', true);
 
 		// Fix our realms
 		db_execute('UPDATE plugin_realms
@@ -275,8 +275,8 @@ function thold_upgrade_database($force = false) {
 		db_execute('DELETE FROM plugin_hooks WHERE name = "thold" AND hook = "config_insert"');
 		db_execute('DELETE FROM plugin_hooks WHERE name = "thold" AND hook = "config_arrays"');
 
-		api_plugin_register_hook('thold', 'config_insert', 'thold_config_insert', 'includes/settings.php', '1');
-		api_plugin_register_hook('thold', 'config_arrays', 'thold_config_arrays', 'includes/settings.php', '1');
+		api_plugin_register_hook('thold', 'config_insert', 'thold_config_insert', 'includes/settings.php', true);
+		api_plugin_register_hook('thold', 'config_arrays', 'thold_config_arrays', 'includes/settings.php', true);
 
 		api_plugin_enable_hooks('thold');
 
@@ -544,7 +544,7 @@ function thold_upgrade_database($force = false) {
 			db_execute('ALTER TABLE thold_template DROP COLUMN bl_enabled', false);
 		}
 
-		api_plugin_register_hook('thold', 'config_form', 'thold_config_form', 'includes/settings.php', '1');
+		api_plugin_register_hook('thold', 'config_form', 'thold_config_form', 'includes/settings.php', true);
 		api_plugin_register_realm('thold', 'notify_lists.php', 'Manage Notification Lists', 1);
 
 		// set unique hash values for all thold templates
@@ -781,10 +781,10 @@ function thold_upgrade_database($force = false) {
 		$data['comment'] = 'Table of Device Template Threshold Templates';
 		api_plugin_db_table_create('thold', 'plugin_thold_host_template', $data);
 
-		api_plugin_register_hook('thold', 'device_template_edit', 'thold_device_template_edit', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'device_template_top', 'thold_device_template_top', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'device_edit_pre_bottom', 'thold_device_edit_pre_bottom', 'setup.php', '1');
-		api_plugin_register_hook('thold', 'api_device_new', 'thold_api_device_new', 'setup.php', '1');
+		api_plugin_register_hook('thold', 'device_template_edit', 'thold_device_template_edit', 'setup.php', true);
+		api_plugin_register_hook('thold', 'device_template_top', 'thold_device_template_top', 'setup.php', true);
+		api_plugin_register_hook('thold', 'device_edit_pre_bottom', 'thold_device_edit_pre_bottom', 'setup.php', true);
+		api_plugin_register_hook('thold', 'api_device_new', 'thold_api_device_new', 'setup.php', true);
 		api_plugin_register_hook('thold', 'page_head', 'thold_page_head', 'setup.php');
 
 		if (api_plugin_is_enabled('thold')) {
@@ -1815,8 +1815,8 @@ function thold_upgrade_database($force = false) {
 
 	db_execute('ALTER TABLE thold_data MODIFY COLUMN name varchar(255) NOT NULL default ""');
 
-	api_plugin_register_hook('thold', 'device_template_change', 'thold_device_template_change', 'setup.php', 1);
-	api_plugin_register_hook('thold', 'settings_bottom', 'thold_settings_bottom', 'setup.php', 1);
+	api_plugin_register_hook('thold', 'device_template_change', 'thold_device_template_change', 'setup.php', true);
+	api_plugin_register_hook('thold', 'settings_bottom', 'thold_settings_bottom', 'setup.php', true);
 
 	api_plugin_register_realm('thold', 'notify_lists.php,notify_queue.php', 'Manage Notification Lists', 1);
 
@@ -2107,8 +2107,8 @@ function thold_setup_database() {
 	$data['comment']   = 'Table of Notification Lists';
 	api_plugin_db_table_create('thold', 'plugin_notification_lists', $data);
 
-	api_plugin_register_hook('thold', 'host_edit_bottom', 'thold_host_edit_bottom', 'setup.php', '1');
-	api_plugin_register_hook('thold', 'device_top', 'thold_device_top', 'setup.php', '1');
+	api_plugin_register_hook('thold', 'host_edit_bottom', 'thold_host_edit_bottom', 'setup.php', true);
+	api_plugin_register_hook('thold', 'device_top', 'thold_device_top', 'setup.php', true);
 
 	api_plugin_db_add_column('thold', 'host', ['name' => 'thold_send_email', 'type' => 'int(10)', 'NULL' => false, 'default' => '1', 'after' => 'disabled']);
 	api_plugin_db_add_column('thold', 'host', ['name' => 'thold_host_email', 'type' => 'int(10)', 'NULL' => true, 'after' => 'thold_send_email']);
diff --git a/setup.php b/setup.php
index 3ad2cbbb..ab799d18 100644
--- a/setup.php
+++ b/setup.php
@@ -51,6 +51,11 @@ function plugin_thold_install($upgrade = false) {
 		return false;
 	}
 
+	// The reinstall below registers the plugin's hooks/realms and provisions
+	// its schema against a live Cacti database (include_once database.php plus
+	// thold_setup_database()/thold_upgrade_database()), so it cannot run in the
+	// isolated unit process.
+	// @codeCoverageIgnoreStart
 	$plugin = 'thold';
 
 	// Insert CSS and JavaScript
@@ -118,7 +123,7 @@ function plugin_thold_install($upgrade = false) {
 	api_plugin_register_hook($plugin, 'api_device_new', 'thold_api_device_new', 'setup.php');
 
 	// Allow settings javascript hooks
-	api_plugin_register_hook('thold', 'settings_bottom', 'thold_settings_bottom', 'setup.php', 1);
+	api_plugin_register_hook('thold', 'settings_bottom', 'thold_settings_bottom', 'setup.php', true);
 
 	// Miscellaneous hooks
 	api_plugin_register_hook($plugin, 'graphs_new_top_links', 'thold_graphs_new', 'setup.php');
@@ -146,6 +151,7 @@ function plugin_thold_install($upgrade = false) {
 		thold_setup_database();
 		thold_snmpagent_cache_install();
 	}
+	// @codeCoverageIgnoreEnd
 }
 
 /**