diff --git a/CHANGELOG.md b/CHANGELOG.md
index e8c6b6e..cba330c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Job filtering — filter the jobs list by queue name, job class (substring), priority, and time period (1h / 24h / 7d / all) via query-param driven scopes; active filters are preserved across status tabs
 - Job filter Turbo Frame — filter form and results table wrapped in a `<turbo-frame>` so applying filters reloads only the table without a full page refresh; `data-turbo-action="advance"` keeps the URL in sync; Turbo JS loaded from esm.sh CDN in the engine layout
 
+### Fixed
+
+- `FailedJobsController#destroy` used a local variable instead of `@execution`, making the Turbo Stream row-removal template a no-op
+- Failed jobs index rendered error as a string via `.lines` — SolidQueue serializes `error` as JSON; now uses `execution.exception_class`
+- Replaced deprecated Rack status `:unprocessable_entity` with `:unprocessable_content`
+
 ## [0.1.0] - 2026-05-24
 
 ### Added
diff --git a/app/controllers/solid_stack_web/failed_jobs_controller.rb b/app/controllers/solid_stack_web/failed_jobs_controller.rb
index ac8da23..66b1f60 100644
--- a/app/controllers/solid_stack_web/failed_jobs_controller.rb
+++ b/app/controllers/solid_stack_web/failed_jobs_controller.rb
@@ -6,8 +6,8 @@ def index
     end
 
     def destroy
-      execution = ::SolidQueue::FailedExecution.find(params[:id])
-      execution.job.destroy!
+      @execution = ::SolidQueue::FailedExecution.find(params[:id])
+      @execution.job.destroy!
       @executions_remain = ::SolidQueue::FailedExecution.exists?
 
       respond_to do |format|
diff --git a/app/controllers/solid_stack_web/jobs_controller.rb b/app/controllers/solid_stack_web/jobs_controller.rb
index 2a4d0e6..6c8ad1c 100644
--- a/app/controllers/solid_stack_web/jobs_controller.rb
+++ b/app/controllers/solid_stack_web/jobs_controller.rb
@@ -44,7 +44,7 @@ def set_filters
     end
 
     def require_discardable
-      head :unprocessable_entity unless Job::DISCARDABLE.include?(@status)
+      head :unprocessable_content unless Job::DISCARDABLE.include?(@status)
     end
 
     def filtered_scope
diff --git a/app/views/solid_stack_web/failed_jobs/destroy.turbo_stream.erb b/app/views/solid_stack_web/failed_jobs/destroy.turbo_stream.erb
new file mode 100644
index 0000000..0efe4b3
--- /dev/null
+++ b/app/views/solid_stack_web/failed_jobs/destroy.turbo_stream.erb
@@ -0,0 +1,9 @@
+<% if @executions_remain %>
+  <%= turbo_stream.remove "execution_#{@execution.id}" %>
+<% else %>
+  <%= turbo_stream.replace "sqw-jobs-table" do %>
+    <div class="sqw-empty">
+      <p>No failed jobs.</p>
+    </div>
+  <% end %>
+<% end %>
\ No newline at end of file
diff --git a/app/views/solid_stack_web/failed_jobs/index.html.erb b/app/views/solid_stack_web/failed_jobs/index.html.erb
index 38ec1dd..fc1c39b 100644
--- a/app/views/solid_stack_web/failed_jobs/index.html.erb
+++ b/app/views/solid_stack_web/failed_jobs/index.html.erb
@@ -19,7 +19,7 @@
           <tr id="execution_<%= execution.id %>">
             <td class="sqw-monospace"><%= execution.job.class_name %></td>
             <td><span class="sqw-badge sqw-badge--queue"><%= execution.job.queue_name %></span></td>
-            <td class="sqw-muted sqw-truncate"><%= execution.error&.lines&.first&.strip %></td>
+            <td class="sqw-muted sqw-truncate" title="<%= execution.exception_class %>: <%= execution.message %>"><%= execution.exception_class %></td>
             <td class="sqw-muted"><%= execution.created_at.strftime("%b %d %H:%M") %></td>
             <td class="sqw-actions">
               <%= button_to "Retry", retry_failed_job_path(execution),
diff --git a/spec/requests/solid_stack_web/authentication_spec.rb b/spec/requests/solid_stack_web/authentication_spec.rb
new file mode 100644
index 0000000..9230ef9
--- /dev/null
+++ b/spec/requests/solid_stack_web/authentication_spec.rb
@@ -0,0 +1,33 @@
+require "rails_helper"
+
+RSpec.describe "Authentication", type: :request do
+  let(:engine_root) { "/solid_stack" }
+
+  around do |example|
+    original = SolidStackWeb.authenticate
+    example.run
+  ensure
+    SolidStackWeb.instance_variable_set(:@authenticate, original)
+  end
+
+  context "when the auth block returns truthy" do
+    it "allows the request through" do
+      SolidStackWeb.authenticate { true }
+
+      get "#{engine_root}/jobs"
+
+      expect(response).to have_http_status(:ok)
+    end
+  end
+
+  context "when the auth block returns falsy" do
+    it "falls back to HTTP Basic auth and returns 401" do
+      SolidStackWeb.authenticate { false }
+
+      get "#{engine_root}/jobs"
+
+      expect(response).to have_http_status(:unauthorized)
+      expect(response.headers["WWW-Authenticate"]).to include("Basic")
+    end
+  end
+end
diff --git a/spec/requests/solid_stack_web/cable_spec.rb b/spec/requests/solid_stack_web/cable_spec.rb
new file mode 100644
index 0000000..a3e94e7
--- /dev/null
+++ b/spec/requests/solid_stack_web/cable_spec.rb
@@ -0,0 +1,50 @@
+require "rails_helper"
+
+RSpec.describe "Cable", type: :request do
+  let(:engine_root) { "/solid_stack" }
+
+  describe "GET /cable" do
+    it "returns 200" do
+      get "#{engine_root}/cable"
+      expect(response).to have_http_status(:ok)
+    end
+
+    it "shows zero counts when no messages exist" do
+      get "#{engine_root}/cable"
+      expect(response.body).to include("Total Messages")
+      expect(response.body).to include("Channels")
+    end
+
+    it "reflects live message count" do
+      SolidCable::Message.broadcast("room:1", { text: "hello" }.to_json)
+      SolidCable::Message.broadcast("room:2", { text: "world" }.to_json)
+
+      get "#{engine_root}/cable"
+
+      expect(response.body).to match(/class="sqw-stat__value">\s*2\s*</)
+    end
+
+    it "lists distinct channels" do
+      SolidCable::Message.broadcast("notifications", "msg1")
+      SolidCable::Message.broadcast("notifications", "msg2")
+      SolidCable::Message.broadcast("chat", "msg3")
+
+      get "#{engine_root}/cable"
+
+      expect(response.body).to include("notifications")
+      expect(response.body).to include("chat")
+    end
+
+    it "shows channel count not message count in the Channels stat" do
+      SolidCable::Message.broadcast("room:1", "a")
+      SolidCable::Message.broadcast("room:1", "b")
+      SolidCable::Message.broadcast("room:2", "c")
+
+      get "#{engine_root}/cable"
+
+      # 2 distinct channels, stat value should be 2 (not 3 messages)
+      expect(response.body).to include("Channels")
+      expect(response.body).to match(/class="sqw-stat__value">\s*2\s*</)
+    end
+  end
+end
diff --git a/spec/requests/solid_stack_web/cache_spec.rb b/spec/requests/solid_stack_web/cache_spec.rb
new file mode 100644
index 0000000..c2a0b23
--- /dev/null
+++ b/spec/requests/solid_stack_web/cache_spec.rb
@@ -0,0 +1,35 @@
+require "rails_helper"
+
+RSpec.describe "Cache", type: :request do
+  let(:engine_root) { "/solid_stack" }
+
+  describe "GET /cache" do
+    it "returns 200" do
+      get "#{engine_root}/cache"
+      expect(response).to have_http_status(:ok)
+    end
+
+    it "shows zero counts when no entries exist" do
+      get "#{engine_root}/cache"
+      expect(response.body).to include("Total Entries")
+      expect(response.body).to include("Total Size")
+    end
+
+    it "reflects live entry count" do
+      SolidCache::Entry.write("key1", "value1")
+      SolidCache::Entry.write("key2", "value2")
+
+      get "#{engine_root}/cache"
+
+      expect(response.body).to match(/class="sqw-stat__value">\s*2\s*</)
+    end
+
+    it "shows human-readable total size" do
+      SolidCache::Entry.write("sizekey", "hello")
+
+      get "#{engine_root}/cache"
+
+      expect(response.body).to include("Bytes").or include("KB").or include("MB")
+    end
+  end
+end
diff --git a/spec/requests/solid_stack_web/failed_jobs_spec.rb b/spec/requests/solid_stack_web/failed_jobs_spec.rb
new file mode 100644
index 0000000..faa8e83
--- /dev/null
+++ b/spec/requests/solid_stack_web/failed_jobs_spec.rb
@@ -0,0 +1,87 @@
+require "rails_helper"
+
+RSpec.describe "FailedJobs", type: :request do
+  let(:engine_root) { "/solid_stack" }
+
+  def create_failed(class_name: "FailingJob", queue_name: "default")
+    SolidQueue::Job.skip_callback(:create, :after, :prepare_for_execution)
+    job = SolidQueue::Job.create!(
+      class_name:, queue_name:, priority: 0,
+      arguments: { "executions" => 0, "exception_executions" => {} }
+    )
+    execution = SolidQueue::FailedExecution.create!(
+      job: job,
+      error: { exception_class: "RuntimeError", message: "something went wrong",
+               backtrace: ["app/jobs/failing_job.rb:5"] }
+    )
+    SolidQueue::Job.set_callback(:create, :after, :prepare_for_execution)
+    execution
+  end
+
+  describe "GET /failed_jobs" do
+    it "returns 200" do
+      get "#{engine_root}/failed_jobs"
+      expect(response).to have_http_status(:ok)
+    end
+
+    it "shows an empty state when there are no failed jobs" do
+      get "#{engine_root}/failed_jobs"
+      expect(response.body).to include("No failed jobs")
+    end
+
+    it "lists failed job class names" do
+      create_failed(class_name: "FailingJob")
+      get "#{engine_root}/failed_jobs"
+      expect(response.body).to include("FailingJob")
+    end
+
+    it "shows the queue name" do
+      create_failed(queue_name: "critical")
+      get "#{engine_root}/failed_jobs"
+      expect(response.body).to include("critical")
+    end
+
+    it "shows the exception class" do
+      create_failed
+      get "#{engine_root}/failed_jobs"
+      expect(response.body).to include("RuntimeError")
+    end
+
+    it "renders Retry and Discard buttons" do
+      create_failed
+      get "#{engine_root}/failed_jobs"
+      expect(response.body).to include("Retry")
+      expect(response.body).to include("Discard")
+    end
+  end
+
+  describe "DELETE /failed_jobs/:id" do
+    context "with HTML format" do
+      it "destroys the job and redirects" do
+        execution = create_failed
+        delete "#{engine_root}/failed_jobs/#{execution.id}"
+        expect(response).to redirect_to("#{engine_root}/failed_jobs")
+        expect(SolidQueue::FailedExecution.exists?(execution.id)).to be false
+      end
+    end
+
+    context "with turbo_stream format" do
+      it "returns a turbo stream response" do
+        execution = create_failed
+        delete "#{engine_root}/failed_jobs/#{execution.id}",
+               headers: { "Accept" => "text/vnd.turbo-stream.html" }
+        expect(response).to have_http_status(:ok)
+        expect(response.media_type).to eq("text/vnd.turbo-stream.html")
+      end
+    end
+  end
+
+  describe "POST /failed_jobs/:id/retry" do
+    it "re-enqueues the job and redirects" do
+      execution = create_failed
+      post "#{engine_root}/failed_jobs/#{execution.id}/retry"
+      expect(response).to redirect_to("#{engine_root}/failed_jobs")
+      expect(SolidQueue::FailedExecution.exists?(execution.id)).to be false
+    end
+  end
+end
diff --git a/spec/requests/solid_stack_web/jobs_spec.rb b/spec/requests/solid_stack_web/jobs_spec.rb
index 0e100e2..f106d7a 100644
--- a/spec/requests/solid_stack_web/jobs_spec.rb
+++ b/spec/requests/solid_stack_web/jobs_spec.rb
@@ -156,6 +156,14 @@ def create_ready(class_name: "MyJob", queue_name: "default", priority: 0)
       expect(response.body).to include("42")
     end
 
+    it "still renders when arguments contain invalid JSON" do
+      job = SolidQueue::Job.create!(class_name: "MyJob", queue_name: "default", priority: 0,
+                                    arguments: "not valid json {{{")
+      get "#{engine_root}/jobs/#{job.ready_execution.id}", params: { status: "ready" }
+
+      expect(response).to have_http_status(:ok)
+    end
+
     it "shows a discard button for ready jobs" do
       job = create_ready
       get "#{engine_root}/jobs/#{job.ready_execution.id}", params: { status: "ready" }
@@ -188,6 +196,70 @@ def create_ready(class_name: "MyJob", queue_name: "default", priority: 0)
     end
   end
 
+  describe "DELETE /jobs/:id" do
+    context "with HTML format" do
+      it "destroys the job and redirects to the jobs list" do
+        job = create_ready
+        delete "#{engine_root}/jobs/#{job.ready_execution.id}", params: { status: "ready" }
+
+        expect(response).to redirect_to("#{engine_root}/jobs?status=ready")
+        expect(SolidQueue::Job.exists?(job.id)).to be false
+      end
+
+      it "preserves filter params in the redirect" do
+        job = create_ready(queue_name: "reports")
+        delete "#{engine_root}/jobs/#{job.ready_execution.id}",
+               params: { status: "ready", queue: "reports", q: "Report", period: "1h" }
+
+        expect(response.location).to include("queue=reports")
+        expect(response.location).to include("q=Report")
+        expect(response.location).to include("period=1h")
+      end
+    end
+
+    context "with turbo_stream format" do
+      it "removes the row when other jobs remain" do
+        job1 = create_ready
+        create_ready
+
+        delete "#{engine_root}/jobs/#{job1.ready_execution.id}",
+               params: { status: "ready" },
+               headers: { "Accept" => "text/vnd.turbo-stream.html" }
+
+        expect(response).to have_http_status(:ok)
+        expect(response.media_type).to eq("text/vnd.turbo-stream.html")
+        expect(response.body).to include("execution_#{job1.ready_execution.id}")
+        expect(response.body).to include("remove")
+      end
+
+      it "replaces the table with empty state when it was the last job" do
+        job = create_ready
+
+        delete "#{engine_root}/jobs/#{job.ready_execution.id}",
+               params: { status: "ready" },
+               headers: { "Accept" => "text/vnd.turbo-stream.html" }
+
+        expect(response.body).to include("sqw-jobs-table")
+        expect(response.body).to include("replace")
+      end
+    end
+
+    it "returns 422 when status is not discardable" do
+      SolidQueue::Job.skip_callback(:create, :after, :prepare_for_execution)
+      job = SolidQueue::Job.create!(class_name: "WorkJob", queue_name: "default", priority: 0)
+      process = SolidQueue::Process.create!(
+        kind: "Worker", name: "worker-spec-del", pid: 88_888,
+        hostname: "test", last_heartbeat_at: Time.current
+      )
+      execution = SolidQueue::ClaimedExecution.create!(job: job, process_id: process.id)
+      SolidQueue::Job.set_callback(:create, :after, :prepare_for_execution)
+
+      delete "#{engine_root}/jobs/#{execution.id}", params: { status: "claimed" }
+
+      expect(response).to have_http_status(:unprocessable_content)
+    end
+  end
+
   describe "combined filters" do
     it "applies class and queue filters together" do
       create_ready(class_name: "ReportJob",  queue_name: "reports")
diff --git a/spec/requests/solid_stack_web/processes_spec.rb b/spec/requests/solid_stack_web/processes_spec.rb
new file mode 100644
index 0000000..8b32744
--- /dev/null
+++ b/spec/requests/solid_stack_web/processes_spec.rb
@@ -0,0 +1,39 @@
+require "rails_helper"
+
+RSpec.describe "Processes", type: :request do
+  let(:engine_root) { "/solid_stack" }
+
+  def create_process(kind: "Worker", name: "worker-1")
+    SolidQueue::Process.create!(
+      kind:, name:, pid: rand(10_000..99_999),
+      hostname: "localhost", last_heartbeat_at: Time.current
+    )
+  end
+
+  describe "GET /processes" do
+    it "returns 200" do
+      get "#{engine_root}/processes"
+      expect(response).to have_http_status(:ok)
+    end
+
+    it "shows an empty state when no processes are running" do
+      get "#{engine_root}/processes"
+      expect(response.body).to include("No active processes")
+    end
+
+    it "lists running processes" do
+      create_process(kind: "Worker", name: "worker-1")
+      get "#{engine_root}/processes"
+      expect(response.body).to include("Worker")
+      expect(response.body).to include("worker-1")
+    end
+
+    it "shows multiple processes" do
+      create_process(kind: "Worker",     name: "worker-1")
+      create_process(kind: "Dispatcher", name: "dispatcher-1")
+      get "#{engine_root}/processes"
+      expect(response.body).to include("Worker")
+      expect(response.body).to include("Dispatcher")
+    end
+  end
+end
diff --git a/spec/requests/solid_stack_web/queues_spec.rb b/spec/requests/solid_stack_web/queues_spec.rb
new file mode 100644
index 0000000..0f797d6
--- /dev/null
+++ b/spec/requests/solid_stack_web/queues_spec.rb
@@ -0,0 +1,66 @@
+require "rails_helper"
+
+RSpec.describe "Queues", type: :request do
+  let(:engine_root) { "/solid_stack" }
+
+  def create_ready(queue_name: "default")
+    SolidQueue::Job.create!(class_name: "MyJob", queue_name:, priority: 0)
+  end
+
+  describe "GET /queues" do
+    it "returns 200" do
+      get "#{engine_root}/queues"
+      expect(response).to have_http_status(:ok)
+    end
+
+    it "lists distinct queue names" do
+      create_ready(queue_name: "alpha")
+      create_ready(queue_name: "beta")
+      get "#{engine_root}/queues"
+      expect(response.body).to include("alpha")
+      expect(response.body).to include("beta")
+    end
+
+    it "shows the ready job count per queue" do
+      2.times { create_ready(queue_name: "reports") }
+      get "#{engine_root}/queues"
+      expect(response.body).to include("reports")
+    end
+
+    it "shows paused state for paused queues" do
+      create_ready(queue_name: "low")
+      SolidQueue::Pause.create!(queue_name: "low")
+      get "#{engine_root}/queues"
+      expect(response.body).to include("Paused")
+    end
+  end
+
+  describe "POST /queues/:id/pause" do
+    it "pauses the queue and redirects" do
+      create_ready(queue_name: "default")
+      post "#{engine_root}/queues/default/pause"
+      expect(response).to redirect_to("#{engine_root}/queues")
+      expect(SolidQueue::Pause.exists?(queue_name: "default")).to be true
+    end
+
+    it "is idempotent when the queue is already paused" do
+      SolidQueue::Pause.create!(queue_name: "default")
+      expect { post "#{engine_root}/queues/default/pause" }.not_to raise_error
+      expect(response).to redirect_to("#{engine_root}/queues")
+    end
+  end
+
+  describe "DELETE /queues/:id/resume" do
+    it "resumes a paused queue and redirects" do
+      SolidQueue::Pause.create!(queue_name: "default")
+      delete "#{engine_root}/queues/default/resume"
+      expect(response).to redirect_to("#{engine_root}/queues")
+      expect(SolidQueue::Pause.exists?(queue_name: "default")).to be false
+    end
+
+    it "is a no-op when the queue is not paused" do
+      expect { delete "#{engine_root}/queues/default/resume" }.not_to raise_error
+      expect(response).to redirect_to("#{engine_root}/queues")
+    end
+  end
+end
diff --git a/spec/solid_stack_web_spec.rb b/spec/solid_stack_web_spec.rb
new file mode 100644
index 0000000..c457477
--- /dev/null
+++ b/spec/solid_stack_web_spec.rb
@@ -0,0 +1,15 @@
+require "rails_helper"
+
+RSpec.describe SolidStackWeb do
+  describe ".configure" do
+    it "yields self so callers can set attributes in a block" do
+      SolidStackWeb.configure do |config|
+        config.page_size = 50
+      end
+
+      expect(SolidStackWeb.page_size).to eq(50)
+    ensure
+      SolidStackWeb.page_size = 25
+    end
+  end
+end