feat: dashboard perf and config

README.md

@@ -118,6 +118,10 @@ Run migrations during deployment or before starting workers against a new schema
 
 Use `UsePostgres(postgres => postgres.DataSource = dataSource)` when an application needs to share or own a prebuilt `NpgsqlDataSource`; in that mode, the application also owns disposal.
 
+The operational store keeps active jobs plus a bounded searchable terminal window. By default, background retention cleanup keeps completed jobs for 24 hours and failed or canceled jobs for 7 days, then deletes those terminal job rows and their tags, concurrency groups, and events. Configure `ShedduellerOptions.JobRetention` to change the windows, set a state retention to `null` to keep that state indefinitely, or set `Enabled = false` to disable cleanup.
+
+Concurrency group limits use a persisted override over a code-defined default over the built-in default of `1`. Use `IConcurrencyGroupManager.SetDefaultLimitAsync(...)` from startup or deployment seeding code so dashboard edits survive restarts. Use `SetLimitAsync(...)` for an explicit live override and `ClearLimitOverrideAsync(...)` to fall back to the code default.
+
 ## Enqueue Jobs
 
 Job methods return `Task` or `ValueTask` and receive the scheduler-owned `CancellationToken`. Use constructor-injected `ILogger<T>` for durable job logs, `Job.Context` when a handler needs the job id or attempt number, and scheduler-supplied `IProgress<decimal>` for durable progress updates.

src/Sheddueller.Dashboard/Components/DashboardLayout.razor

@@ -34,6 +34,10 @@
                     <span class="material-symbols-outlined" aria-hidden="true">analytics</span>
                     <span>Metrics</span>
                 </NavLink>
+                <NavLink class="sd-sidebar__link" href="settings">
+                    <span class="material-symbols-outlined" aria-hidden="true">settings</span>
+                    <span>Settings</span>
+                </NavLink>
             </nav>
 
             @if (CurrentRefresh is { } refresh)