test(workers): prove clock and restart safety

JobTrackerApi/Services/DailyExportHostedService.cs

@@ -10,7 +10,8 @@ public sealed class DailyExportHostedService(
     ILogger<DailyExportHostedService> logger,
     IConfiguration configuration,
     AppPaths paths,
-    IStartupReadiness startupReadiness) : BackgroundService
+    IStartupReadiness startupReadiness,
+    TimeProvider timeProvider) : BackgroundService
 {
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
@@ -25,11 +26,11 @@ public sealed class DailyExportHostedService(
         if (hour is < 0 or > 23) hour = 2;
         while (!stoppingToken.IsCancellationRequested)
         {
-            var now = DateTime.Now;
+            var now = timeProvider.GetLocalNow().DateTime;
             var next = new DateTime(now.Year, now.Month, now.Day, hour, 0, 0);
             if (next <= now) next = next.AddDays(1);
             logger.LogInformation("Next daily export scheduled at {Next}.", next);
-            await Task.Delay(next - now, stoppingToken);
+            await Task.Delay(next - now, timeProvider, stoppingToken);
             await RunOnceAsync(stoppingToken);
         }
     }
@@ -48,12 +49,13 @@ public sealed class DailyExportHostedService(
     {
         var db = services.GetRequiredService<JobTrackerContext>();
         var owner = db.CurrentUserId ?? throw new InvalidOperationException("Daily export requires an explicit owner scope.");
+        var now = timeProvider.GetLocalNow().DateTime;
         var jobs = await db.JobApplications.AsNoTracking().OrderByDescending(job => job.DateApplied).ToListAsync(cancellationToken);
         var jobIds = jobs.Select(job => job.Id).ToList();
         var export = new
         {
             Version = "dailyexport.v2",
-            CreatedAt = DateTime.Now,
+            CreatedAt = now,
             OwnerUserId = owner,
             Companies = await db.Companies.AsNoTracking().OrderBy(company => company.Name).ToListAsync(cancellationToken),
             JobApplications = jobs,
@@ -96,7 +98,7 @@ public sealed class DailyExportHostedService(
 
         var folder = paths.GetOwnerDailyExportsRoot(configuration["Exports:DailyFolder"], owner);
         Directory.CreateDirectory(folder);
-        var finalPath = Path.Combine(folder, $"daily_export_{DateTime.Now:yyyyMMdd}.json");
+        var finalPath = Path.Combine(folder, $"daily_export_{now:yyyyMMdd}.json");
         var temporaryPath = finalPath + $".{Guid.NewGuid():N}.tmp";
         try
         {

JobTrackerApi/Services/FollowUpReminderHostedService.cs

@@ -10,7 +10,8 @@ public sealed class FollowUpReminderHostedService(
     IConfiguration configuration,
     ILogger<FollowUpReminderHostedService> logger,
     IStartupReadiness startupReadiness,
-    ExternalOrigin externalOrigin) : BackgroundService
+    ExternalOrigin externalOrigin,
+    TimeProvider timeProvider) : BackgroundService
 {
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
@@ -21,11 +22,11 @@ public sealed class FollowUpReminderHostedService(
             return;
         }
 
-        await Task.Delay(TimeSpan.FromSeconds(10), stoppingToken);
+        await Task.Delay(TimeSpan.FromSeconds(10), timeProvider, stoppingToken);
         while (!stoppingToken.IsCancellationRequested)
         {
             await RunOnceAsync(stoppingToken);
-            await Task.Delay(TimeSpan.FromHours(6), stoppingToken);
+            await Task.Delay(TimeSpan.FromHours(6), timeProvider, stoppingToken);
         }
     }
 
@@ -45,7 +46,7 @@ public sealed class FollowUpReminderHostedService(
         var users = services.GetRequiredService<UserManager<ApplicationUser>>();
         var email = services.GetRequiredService<IAppEmailSender>();
         var settings = await RulesEngine.GetSettings(db, cancellationToken);
-        var now = DateTime.Now;
+        var now = timeProvider.GetLocalNow().DateTime;
         var lookAheadDays = Math.Clamp(configuration.GetValue("Email:FollowUpReminders:UpcomingDays", 2), 1, 14);
         var upcomingTo = now.AddDays(lookAheadDays);
         var lastMessages = await db.Correspondences.AsNoTracking()

JobTrackerApi/Services/JobEnrichmentHostedService.cs

@@ -11,7 +11,8 @@ public sealed class JobEnrichmentHostedService(
     BackgroundTenantRunner tenants,
     IConfiguration configuration,
     ILogger<JobEnrichmentHostedService> logger,
-    IStartupReadiness startupReadiness) : BackgroundService
+    IStartupReadiness startupReadiness,
+    TimeProvider timeProvider) : BackgroundService
 {
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
@@ -22,11 +23,11 @@ public sealed class JobEnrichmentHostedService(
             return;
         }
 
-        await Task.Delay(TimeSpan.FromSeconds(10), stoppingToken);
+        await Task.Delay(TimeSpan.FromSeconds(10), timeProvider, stoppingToken);
         while (!stoppingToken.IsCancellationRequested)
         {
             await RunOnceAsync(stoppingToken);
-            await Task.Delay(TimeSpan.FromMinutes(10), stoppingToken);
+            await Task.Delay(TimeSpan.FromMinutes(10), timeProvider, stoppingToken);
         }
     }
 

JobTrackerApi/Services/RulesHostedService.cs

@@ -8,7 +8,8 @@ public sealed class RulesHostedService(
     BackgroundTenantRunner tenants,
     IConfiguration configuration,
     ILogger<RulesHostedService> logger,
-    IStartupReadiness startupReadiness) : BackgroundService
+    IStartupReadiness startupReadiness,
+    TimeProvider timeProvider) : BackgroundService
 {
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
@@ -19,11 +20,11 @@ public sealed class RulesHostedService(
             return;
         }
 
-        await Task.Delay(TimeSpan.FromSeconds(2), stoppingToken);
+        await Task.Delay(TimeSpan.FromSeconds(2), timeProvider, stoppingToken);
         while (!stoppingToken.IsCancellationRequested)
         {
             await RunOnceAsync(stoppingToken);
-            await Task.Delay(TimeSpan.FromMinutes(30), stoppingToken);
+            await Task.Delay(TimeSpan.FromMinutes(30), timeProvider, stoppingToken);
         }
     }
 
@@ -35,11 +36,11 @@ public sealed class RulesHostedService(
         return tenants.RunForJobOwnersAsync("rules", ProcessOwnerAsync, cancellationToken);
     }
 
-    private static async Task ProcessOwnerAsync(IServiceProvider services, CancellationToken cancellationToken)
+    private async Task ProcessOwnerAsync(IServiceProvider services, CancellationToken cancellationToken)
     {
         var db = services.GetRequiredService<JobTrackerContext>();
         var settings = await RulesEngine.GetSettings(db, cancellationToken);
-        var now = DateTime.Now;
+        var now = timeProvider.GetLocalNow().DateTime;
         var lastMessages = await db.Correspondences
             .GroupBy(message => message.JobApplicationId)
             .Select(group => new { JobApplicationId = group.Key, Last = group.Max(x => x.Date) })