fix: Simplify cron expression generation and improve error handling in background worker managers

framework/src/Volo.Abp.BackgroundWorkers.Hangfire/Volo/Abp/BackgroundWorkers/Hangfire/HangfireDynamicBackgroundWorkerManager.cs

@@ -140,29 +140,31 @@ public class HangfireDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMa
     protected virtual string GetCron(int period)
     {
         var time = TimeSpan.FromMilliseconds(period);
-        string cron;
 
         if (time.TotalSeconds <= 59)
         {
-            cron = $"*/{time.TotalSeconds} * * * * *";
+            var seconds = (int)Math.Round(time.TotalSeconds);
+            return $"*/{seconds} * * * * *";
         }
-        else if (time.TotalMinutes <= 59)
-        {
-            cron = $"*/{time.TotalMinutes} * * * *";
-        }
-        else if (time.TotalHours <= 23)
+
+        if (time.TotalMinutes <= 59)
         {
-            cron = $"0 */{time.TotalHours} * * *";
+            var minutes = (int)Math.Round(time.TotalMinutes);
+            return $"*/{minutes} * * * *";
         }
-        else if (time.TotalDays <= 31)
+
+        if (time.TotalHours <= 23)
         {
-            cron = $"0 0 0 1/{time.TotalDays} * *";
+            var hours = (int)Math.Round(time.TotalHours);
+            return $"0 */{hours} * * *";
         }
-        else
+
+        if (time.TotalDays <= 31)
         {
-            throw new AbpException($"Cannot convert period: {period} to cron expression.");
+            var days = (int)Math.Round(time.TotalDays);
+            return $"0 0 */{days} * *";
         }
 
-        return cron;
+        throw new AbpException($"Cannot convert period: {period} to cron expression.");
     }
 }

framework/src/Volo.Abp.BackgroundWorkers.TickerQ/Volo/Abp/BackgroundWorkers/TickerQ/TickerQDynamicBackgroundWorkerManager.cs

@@ -92,6 +92,10 @@ public class TickerQDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMan
         AbpTickerQBackgroundWorkersProvider.BackgroundWorkers.Remove(functionName);
         HandlerRegistry.Unregister(workerName);
 
+        // Note: ICronTickerManager<T> does not provide a remove API.
+        // The handler is unregistered above, so any persisted cron entry will
+        // find a null handler and skip execution silently.
+
         return Task.FromResult(true);
     }
 
@@ -138,6 +142,9 @@ public class TickerQDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMan
         var time = TimeSpan.FromMilliseconds(period);
         if (time.TotalMinutes < 1)
         {
+            Logger.LogWarning(
+                "TickerQ does not support sub-minute intervals. Period {Period}ms will be rounded up to every minute.",
+                period);
             return "* * * * *";
         }
 

framework/src/Volo.Abp.BackgroundWorkers/Volo/Abp/BackgroundWorkers/DefaultDynamicBackgroundWorkerManager.cs

@@ -37,7 +37,7 @@ public class DefaultDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMan
 
         schedule.Validate();
 
-        if (schedule.Period == null && !string.IsNullOrWhiteSpace(schedule.CronExpression))
+        if (schedule.Period == null)
         {
             throw new AbpException(
                 $"The default in-memory background worker manager does not support CronExpression without Period for dynamic worker '{workerName}'. " +
@@ -79,7 +79,7 @@ public class DefaultDynamicBackgroundWorkerManager : IDynamicBackgroundWorkerMan
 
         schedule.Validate();
 
-        if (schedule.Period == null && !string.IsNullOrWhiteSpace(schedule.CronExpression))
+        if (schedule.Period == null)
         {
             throw new AbpException(
                 $"The default in-memory background worker manager does not support CronExpression without Period for dynamic worker '{workerName}'. " +