diff --git a/lib/plankton/plankton.d.ts b/lib/plankton/plankton.d.ts
index b6ac230..473f2ed 100644
--- a/lib/plankton/plankton.d.ts
+++ b/lib/plankton/plankton.d.ts
@@ -235,7 +235,7 @@ declare namespace lib_plankton.base {
      */
     function object_merge(core: Record<string, any>, mantle: Record<string, any>): Record<string, any>;
 }
-declare module lib_plankton.pod {
+declare namespace lib_plankton.pod {
     /**
      * @author fenris
      */
@@ -279,7 +279,7 @@ declare module lib_plankton.pod {
         show_value?: ((value: type_value) => string);
     }): string;
 }
-declare module lib_plankton.pod {
+declare namespace lib_plankton.pod {
     /**
      */
     class class_pod<type_value> {
@@ -693,7 +693,13 @@ declare namespace lib_plankton.call {
      *
      * @author fenris
      */
-    function defer<type_result>(seconds: int, action: (() => type_result)): Promise<type_result>;
+    function defer<type_result>(seconds: float, action: (() => type_result)): {
+        id: int;
+        result: Promise<type_result>;
+    };
+    /**
+     */
+    function deferral_abort(id: int): void;
     /**
      * for rate_limit_check
      *
diff --git a/lib/plankton/plankton.js b/lib/plankton/plankton.js
index 9dedef8..407f550 100644
--- a/lib/plankton/plankton.js
+++ b/lib/plankton/plankton.js
@@ -1621,11 +1621,19 @@ var lib_plankton;
          * @author fenris
          */
         function defer(seconds, action) {
-            return (new Promise((resolve, reject) => {
-                setTimeout(() => resolve(action()), seconds);
-            }));
+            let timeout_id;
+            const result_promise = new Promise((resolve, reject) => {
+                timeout_id = setTimeout(() => resolve(action()), Math.floor(seconds * 1000));
+            });
+            return { "id": timeout_id, "result": result_promise };
         }
         call.defer = defer;
+        /**
+         */
+        function deferral_abort(id) {
+            clearTimeout(id);
+        }
+        call.deferral_abort = deferral_abort;
         /**
          * rate limiting algorithm, based on the idea of mana (magic power) in video games:
          * - an actor has a fixed mana capacity, i.e. the maximum amount of available power
diff --git a/source/app/cli.ts b/source/app/cli.ts
index 367210d..67ff65f 100644
--- a/source/app/cli.ts
+++ b/source/app/cli.ts
@@ -215,7 +215,7 @@ async function main(
 					lib_plankton.log.enum_level.notice,
 					lib_plankton.log.enum_level.warning,
 					lib_plankton.log.enum_level.error,
-				][Math.min(4, args["verbosity"])]
+				][Math.min(4, /*args["verbosity"]*/0)]
 			),
 		]
 	);
@@ -278,18 +278,70 @@ async function main(
 								args["database_path"],
 								args["order_path"],
 								async () => {
-									await _heimdall.master.clean(
-										{
-											"time_to_live": args["time_to_live"],
-											"erase_state": args["erase_state"],
+									let ordered_to_quit : boolean = false;
+									let deferral_id : (null | int) = null;
+									const stop = function () {
+										ordered_to_quit = true;
+										if (deferral_id === null) {
+											// do nothing
+										}
+										else {
+											lib_plankton.call.deferral_abort(deferral_id);
+										}
+									};
+									process.on(
+										"SIGINT",
+										() => {
+											lib_plankton.log.info("main_received_sigint", {});
+											stop();
 										}
 									);
-									await _heimdall.master.run(
-										order,
-										{
-											"send_ok_notifications": args["send_ok_notifications"],
+									process.on(
+										"SIGTERM",
+										() => {
+											lib_plankton.log.info("main_received_sigterm", {});
+											stop();
 										}
 									);
+									while (! ordered_to_quit) {
+										// cleanup
+										{
+											lib_plankton.log.debug("cleanup_starting", {});
+											await _heimdall.master.clean(
+												{
+													"time_to_live": args["time_to_live"],
+													"erase_state": args["erase_state"],
+												}
+											);
+											lib_plankton.log.debug("cleanup_ended", {});
+										}
+										// run checks
+										{
+											lib_plankton.log.debug("checks_starting", {});
+											await _heimdall.master.run(
+												order,
+												{
+													"send_ok_notifications": args["send_ok_notifications"],
+												}
+											);
+											lib_plankton.log.debug("checks_ended", {});
+										}
+										// pause
+										{
+											let {timeout_id, promise} = lib_plankton.call.timeout_start<void>(
+												new Promise<void>(
+													(resolve, reject) => {
+														while (! ordered_to_quit) {
+															// laze
+														}
+														resolve(undefined);
+													}
+												),
+												5.0
+											);
+											await promise;
+										}
+									}
 								}
 							)
 						)
diff --git a/source/logic/master.ts b/source/logic/master.ts
index d71dab2..f950647 100644
--- a/source/logic/master.ts
+++ b/source/logic/master.ts
@@ -114,16 +114,21 @@ namespace _heimdall.master
 			options.time_to_live,
 			options.erase_state
 		);
-		lib_plankton.log.info(
-			lib_plankton.translate.get(
-				"misc.cleanup_info",
+		if (count <= 0) {
+			// do nothing
+		}
+		else {
+			lib_plankton.log.info(
+				lib_plankton.translate.get(
+					"misc.cleanup_info",
+					{
+						"count": count.toFixed(0),
+					}
+				),
 				{
-					"count": count.toFixed(0),
 				}
-			),
-			{
-			}
-		);
+			);
+		}
 	}
 
 
@@ -189,9 +194,11 @@ namespace _heimdall.master
 			return Promise.reject();
 		}
 		else {
+			lib_plankton.log.info("mutex_setting", {});
 			await lib_plankton.file.write(mutex_path, "");
 			await procedure();
 			await lib_plankton.file.delete_(mutex_path);
+			lib_plankton.log.info("mutex_released", {});
 		}
 	}
 
diff --git a/source/logic/order.ts b/source/logic/order.ts
index 2b17fa2..f888656 100644
--- a/source/logic/order.ts
+++ b/source/logic/order.ts
@@ -384,7 +384,7 @@ namespace _heimdall.order
 							},
 						),
 						node
-					);
+					) as type_check;
 					let check : type_check = {
 						"name": node_.name,
 						"title": node_.title,