CUB-135: Subscribe to SSE in React and update UI

docs/CONTEXT.md

@@ -1,214 +0,0 @@
-# Extrudex — Project Context
-
-> **Last updated:** 2026-05-21
-> **Repo:** `CubeCraft-Creations/Extrudex` | **Host:** `code.cubecraftcreations.com`
-> **Local clone:** `/mnt/ai-storage/projects/Extrudex` | **Default branch:** `dev`
-> **Discord:** `DISCORD_DEV_EXTRUDEX_CHANNEL_ID`
-> **Linear Epic:** [CUB-110](https://linear.app/cubecraft-creations/issue/CUB-110)
-
----
-
-## Overview
-
-Custom filament inventory and print tracking system for CubeCraft Creations. Tracks spool consumption, material costs, and per-print COGS across a fleet of 6 FDM printers (5 Bambu Lab + 1 Elegoo Centauri Carbon) + resin printers. Kiosk interface on Raspberry Pi 5 with USB barcode scanner.
-
-**Active refactor in progress:** .NET → Go + React (CUB-110 epic).
-
-## Tech Stack
-
-| Layer | Technology | Notes |
-|-------|-----------|-------|
-| Backend (legacy) | ASP.NET Core 9 + EF Core | Being replaced by Go |
-| Backend (new) | Go 1.24+ | Chi router, pgx (PostgreSQL), gorilla/websocket, paho.mqtt.golang |
-| Frontend (legacy) | Angular 17+ | Being replaced by React |
-| Frontend (new) | React 18 + TypeScript + Tailwind CSS | Vite |
-| Database | PostgreSQL 16+ | snake_case naming |
-| Real-time | SSE (Server-Sent Events) | Replaces SignalR |
-| Printer integrations | Moonraker REST + WebSocket, MQTT TLS | Elegoo/Klipper + Bambu Lab |
-| CI/CD | Gitea Actions | `.gitea/workflows/dev.yml` |
-| Deployment | Docker/Compose, Pi 5 kiosk | |
-
-## Key Design Decisions
-
-1. **Custom system over Spoolman** — Full control over data model and integrations
-2. **MaterialFinish required** on every spool; default is "Basic"
-3. **MaterialModifier is optional**
-4. **Grams derived from:** `mm_extruded × filament_cross_section_area × material_density`
-5. **Push over poll** — SSE + MQTT preferred; Moonraker polling is fallback
-6. **Snake_case** for all PostgreSQL identifiers
-
-## Project Structure
-
-```
-Extrudex/
-├── backend/                         # Original .NET backend (being replaced)
-│   ├── API/Controllers/             # Filaments, Spools, PrintJobs, Printers, Materials, QR, UsageLogs, Cost
-│   ├── API/DTOs/                    # DTOs per domain
-│   ├── API/Validators/              # FluentValidation rules
-│   ├── API/Hubs/                    # SignalR PrinterHub
-│   ├── API/Jobs/                    # Background sync jobs
-│   ├── Domain/Entities/             # EF Core entities (Printer, Spool, PrintJob, MaterialBase, etc.)
-│   ├── Domain/Enums/                # ConnectionType, DataSource, JobStatus, PrinterStatus, QrResourceType
-│   ├── Domain/Interfaces/           # Service interfaces
-│   ├── Infrastructure/Data/         # EF DbContext, Configurations, Migrations, SeedData
-│   ├── Infrastructure/Services/     # MoonrakerClient, CostPerPrint, UsageLog, FilamentUsage, QR
-│   └── Program.cs                  # ASP.NET entry point
-├── cmd/server/main.go              # Go entrypoint (new), worker discovery, graceful shutdown
-├── internal/                       # Go backend (new)
-│   ├── config/config.go            # Env vars
-│   ├── db/db.go                    # PostgreSQL connection pool (pgx)
-│   ├── models/models.go            # Go domain structs
-│   ├── router/router.go            # Chi HTTP routes
-│   ├── sse/broadcaster.go          # SSE broadcaster
-│   ├── sse/events.go               # SSE event types
-│   ├── sse/handler.go              # SSE HTTP handler
-│   ├── handlers/                   # API handlers (filament, health, material, print_job, printer, usage_log)
-│   ├── repositories/               # DB access layer
-│   └── services/                   # Business logic + validation
-├── migrations/                     # Go-migrate SQL migrations
-│   ├── 000001_initial_schema.up.sql
-│   ├── 000001_initial_schema.down.sql
-│   ├── 000002_seed_data.up.sql
-│   └── 000002_seed_data.down.sql
-├── frontend/                       # React frontend (new)
-│   ├── src/
-│   │   ├── App.tsx
-│   │   ├── main.tsx
-│   │   ├── components/             # ColorSwatch, LoadingSpinner, RecentPrints, SummaryCard
-│   │   ├── pages/
-│   │   │   ├── Dashboard.tsx       # Main dashboard with summary cards + recent prints
-│   │   │   └── InventoryPage.tsx   # Filament inventory list (table + filters)
-│   │   ├── services/
-│   │   │   ├── api.ts              # Axios client
-│   │   │   └── filamentService.ts
-│   │   ├── stores/                 # State stores (WIP)
-│   │   ├── types/
-│   │   │   ├── filament.ts
-│   │   │   └── index.ts
-│   │   └── hooks/
-│   ├── Dockerfile + nginx.conf
-│   └── vite.config.ts, tailwind.config.js
-├── design/                         # UX/design specs + mockup images
-│   ├── homepage-spec.md
-│   ├── 01-filament-inventory-list.md
-│   ├── 02-spool-detail-view.md
-│   ├── 03-smart-intake-workflow.md
-│   ├── smart-intake-identify-spec.md
-│   └── *.jpg / *.png               # Mockup images (kiosk + mobile)
-├── docker-compose.dev.yml
-└── deploy.sh
-```
-
-## Database Schema (PostgreSQL — .NET EF Core Migrations)
-
-Core entities managed by EF Core with full configurations:
-- **Printers** — id, name, type (BambuLab/Moonraker), connection_type, status, ip_address, mac_address, ams_count
-- **AmsUnit / AmsSlot** — Bambu Lab AMS tray tracking
-- **Spools** — filament inventory with material, color, weight, location, QR support
-- **MaterialBase / MaterialFinish / MaterialModifier** — material taxonomy
-- **PrintJobs** — job tracking with status, cost, filament consumption
-- **UsageLogs** — per-printer filament consumption records
-- **FilamentUsage** — aggregated per-spool consumption tracking
-- **FilamentUsageSyncJob** — background Moonraker polling
-- **MoonrakerPrinterSyncJob** — background printer status sync
-
-## API Endpoints (.NET)
-
-| Method | Endpoint | Description |
-|--------|----------|-------------|
-| GET | /api/filaments | List filaments (paginated, filterable) |
-| POST | /api/filaments | Create filament |
-| GET | /api/filaments/{id} | Get filament detail |
-| PUT | /api/filaments/{id} | Update filament |
-| DELETE | /api/filaments/{id} | Delete filament |
-| GET | /api/spools | List spools |
-| POST | /api/spools | Create spool |
-| GET | /api/spools/{id} | Get spool detail |
-| PUT | /api/spools/{id} | Update spool |
-| DELETE | /api/spools/{id} | Delete spool |
-| GET | /api/print-jobs | List print jobs |
-| POST | /api/print-jobs | Create print job |
-| GET | /api/print-jobs/{id} | Get print job detail |
-| GET | /api/printers | List printers |
-| POST | /api/printers | Register printer |
-| GET | /api/printers/{id} | Get printer detail |
-| GET | /api/printers/{id}/costs | Per-print cost summary |
-| GET | /api/printers/{id}/usage | Filament usage history |
-| GET | /api/materials/bases | List material bases |
-| POST | /api/materials/bases | Create material base |
-| GET | /api/materials/finishes | List material finishes |
-| POST | /api/materials/finishes | Create material finish |
-| GET | /api/materials/modifiers | List material modifiers |
-| POST | /api/materials/modifiers | Create modifier |
-| GET | /api/materials/lookups | Unified material lookup |
-| GET | /api/qr/resolve/{code} | QR code resolve |
-| GET | /api/usage-logs | List usage logs |
-| POST | /api/usage-logs | Create usage log |
-
-## CUB-110 Epic Progress (Go + React Rewrite)
-
-| Sub-task | Title | Status | Agent |
-|----------|-------|--------|-------|
-| CUB-111 | Design PostgreSQL schema | Done | Hex |
-| CUB-112 | Scaffold Go backend | Done | Dex |
-| CUB-113 | Core CRUD API endpoints | Done | Dex |
-| CUB-116 | Scaffold React frontend | In Review | Rex |
-| CUB-117 | Moonraker + MQTT integrations | In Progress | Dex |
-| CUB-118 | (deprecated → CUB-135 + CUB-136) | — | — |
-| CUB-130 | Add/Edit Filament form | In Review | Rex |
-| CUB-131 | Filament Detail page | In Review | Rex |
-| CUB-132 | Filament Inventory list | Done | Rex |
-| CUB-133 | Dashboard summary cards | In Review | Rex |
-| CUB-134 | Printers list page | Todo | Rex |
-| CUB-135 | Subscribe to SSE in React | In Review | Rex |
-| CUB-136 | Add SSE endpoint in Go | In Review | Dex |
-| CUB-128 | Settings page | Todo | — |
-| CUB-129 | Print Jobs list page | Todo | — |
-| CUB-114 | Pi 5 kiosk deployment | Todo | — |
-
-## Active Branches
-
-| Branch | Agent | Issue | Status |
-|--------|-------|-------|--------|
-| `agent/dex/CUB-117-moonraker-mqtt-go` | Dex | CUB-117 | Local commit ready |
-| `agent/dex/CUB-136-sse-endpoint` | Dex | CUB-136 | PR open |
-| `agent/rex/CUB-130-filament-form` | Rex | CUB-130 | PR open |
-| `agent/rex/CUB-131-filament-detail` | Rex | CUB-131 | PR open |
-| `agent/rex/CUB-133-dashboard-cards` | Rex | CUB-133 | PR open |
-| `agent/rex/CUB-135-sse-subscribe` | Rex | CUB-135 | PR open |
-
-## Known Limitations
-
-- Go rewrite is in progress — backend `internal/` is new Go code, but legacy .NET code still serves endpoints
-- Kiosk deployment not finalized (CUB-114)
-- Smart intake workflow is designed but not implemented
-- MQTT Bambu Lab integration is partially complete (CUB-117)
-
-## Default Agent Assignments
-
-| Area | Agent | Notes |
-|------|-------|-------|
-| Backend (Go API, Moonraker, MQTT) | Dex | gitea-dex MCP |
-| Database (PostgreSQL schema, migrations) | Hex | gitea-hex MCP |
-| Frontend (React, Tailwind) | Rex | gitea-rex MCP |
-| Design (wireframes, UX) | Sketch | |
-
-## Getting Started
-
-```bash
-cd /mnt/ai-storage/projects/Extrudex
-git checkout dev
-git pull origin dev
-
-# Legacy .NET backend
-cd backend && dotnet run
-
-# New Go backend
-go run cmd/server/main.go
-
-# React frontend
-cd frontend && npm install && npm run dev
-
-# Docker
-docker compose -f docker-compose.dev.yml up --build
-```

frontend/src/App.tsx

@@ -1,35 +1,34 @@
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
 import { BrowserRouter, Routes, Route } from 'react-router-dom'
-import Dashboard from './pages/Dashboard'
 import InventoryPage from './pages/InventoryPage'
-import PrintersPage from './pages/PrintersPage'
+import ToastContainer from './components/ToastContainer'
+import { useSSE } from './hooks/useSSE'
 
 const queryClient = new QueryClient()
 
+function SSEProvider({ children }: { children: React.ReactNode }) {
+  useSSE()
+  return <>{children}</>
+}
+
 export default function App() {
   return (
     <QueryClientProvider client={queryClient}>
       <BrowserRouter>
+        <SSEProvider>
           <div className="min-h-screen bg-slate-900 text-slate-50">
-          <header className="bg-slate-800 border-b border-slate-700 px-4 py-3 flex items-center gap-4 sticky top-0 z-20">
+            <header className="bg-slate-800 border-b border-slate-700 px-4 py-3 flex items-center gap-3 sticky top-0 z-20">
-            <a href="/" className="flex items-center gap-3 no-underline">
               <div className="w-8 h-8 rounded bg-emerald-500 flex items-center justify-center text-slate-900 font-bold text-lg">E</div>
-              <h1 className="text-lg font-semibold text-slate-50">Extrudex</h1>
+              <h1 className="text-lg font-semibold">Extrudex</h1>
-            </a>
-            <nav className="flex items-center gap-1 ml-2">
-              <a href="/" className="px-3 py-1.5 rounded-md text-sm text-slate-300 hover:text-slate-100 hover:bg-slate-700 transition-colors">Dashboard</a>
-              <a href="/inventory" className="px-3 py-1.5 rounded-md text-sm text-slate-300 hover:text-slate-100 hover:bg-slate-700 transition-colors">Inventory</a>
-              <a href="/printers" className="px-3 py-1.5 rounded-md text-sm text-slate-300 hover:text-slate-100 hover:bg-slate-700 transition-colors">Printers</a>
-            </nav>
             </header>
             <main className="p-4">
               <Routes>
-              <Route path="/" element={<Dashboard />} />
+                <Route path="/" element={<InventoryPage />} />
-              <Route path="/inventory" element={<InventoryPage />} />
-              <Route path="/printers" element={<PrintersPage />} />
               </Routes>
             </main>
           </div>
+          <ToastContainer />
+        </SSEProvider>
       </BrowserRouter>
     </QueryClientProvider>
   )

frontend/src/components/LoadingSpinner.tsx

@@ -1,8 +0,0 @@
-export default function LoadingSpinner() {
-  return (
-    <div className="flex flex-col items-center gap-3">
-      <div className="w-10 h-10 border-4 border-emerald-500/30 border-t-emerald-400 rounded-full animate-spin" />
-      <p className="text-slate-400 text-sm">Loading dashboard…</p>
-    </div>
-  )
-}

frontend/src/components/PrinterStatusBadge.tsx

@@ -0,0 +1,17 @@
+import { Printer } from 'lucide-react'
+
+const STYLES = {
+  online: 'bg-emerald-600 text-white',
+  offline: 'bg-slate-600 text-slate-200',
+  printing: 'bg-blue-600 text-white animate-pulse',
+}
+
+export default function PrinterStatusBadge({ status, name }: { status: string; name?: string }) {
+  const style = STYLES[status as keyof typeof STYLES] ?? STYLES.offline
+  return (
+    <span className={`inline-flex items-center gap-1.5 rounded-full px-2.5 py-1 text-xs font-medium ${style}`}>
+      <Printer size={12} />
+      {name ? `${name} · ${status}` : status}
+    </span>
+  )
+}

frontend/src/components/RecentPrints.tsx

@@ -1,76 +0,0 @@
-import type { PrintJob } from '../types'
-import { Clock, FileText } from 'lucide-react'
-
-interface RecentPrintsProps {
-  jobs: PrintJob[]
-}
-
-export default function RecentPrints({ jobs }: RecentPrintsProps) {
-  if (jobs.length === 0) {
-    return (
-      <div className="rounded-xl border border-slate-700 bg-slate-800 p-6 text-center text-slate-400">
-        <FileText size={32} className="mx-auto mb-3 text-slate-500" />
-        <p>No recent print jobs</p>
-      </div>
-    )
-  }
-
-  const statusColor = (status: string) => {
-    switch (status.toLowerCase()) {
-      case 'completed': return 'text-emerald-400 bg-emerald-500/10'
-      case 'in_progress': return 'text-sky-400 bg-sky-500/10'
-      case 'failed': return 'text-red-400 bg-red-500/10'
-      default: return 'text-slate-400 bg-slate-500/10'
-    }
-  }
-
-  return (
-    <div className="rounded-xl border border-slate-700 bg-slate-800 overflow-hidden">
-      <div className="overflow-x-auto">
-        <table className="w-full text-left">
-          <thead>
-            <tr className="border-b border-slate-700">
-              <th className="px-4 py-3 text-sm font-medium text-slate-400">Name</th>
-              <th className="px-4 py-3 text-sm font-medium text-slate-400">Status</th>
-              <th className="px-4 py-3 text-sm font-medium text-slate-400">Duration</th>
-              <th className="px-4 py-3 text-sm font-medium text-slate-400">Filament</th>
-              <th className="px-4 py-3 text-sm font-medium text-slate-400">Cost</th>
-            </tr>
-          </thead>
-          <tbody>
-            {jobs.map((job) => (
-              <tr key={job.id} className="border-b border-slate-700/50 last:border-0 hover:bg-slate-700/30 transition-colors">
-                <td className="px-4 py-3 text-sm text-slate-100 font-medium">{job.name}</td>
-                <td className="px-4 py-3">
-                  <span className={`inline-flex items-center gap-1 px-2 py-1 rounded-full text-xs font-medium ${statusColor(job.status)}`}>
-                    {job.status}
-                  </span>
-                </td>
-                <td className="px-4 py-3 text-sm text-slate-300">
-                  <div className="flex items-center gap-1">
-                    <Clock size={14} />
-                    {formatDuration(job.duration_seconds)}
-                  </div>
-                </td>
-                <td className="px-4 py-3 text-sm text-slate-300">
-                  {job.filament_used_grams?.toFixed(1) ?? '-'} g
-                </td>
-                <td className="px-4 py-3 text-sm text-slate-300">
-                  ${job.cost_usd?.toFixed(2) ?? '-'}
-                </td>
-              </tr>
-            ))}
-          </tbody>
-        </table>
-      </div>
-    </div>
-  )
-}
-
-function formatDuration(seconds: number): string {
-  if (!seconds) return '-'
-  const hrs = Math.floor(seconds / 3600)
-  const mins = Math.floor((seconds % 3600) / 60)
-  if (hrs > 0) return `${hrs}h ${mins}m`
-  return `${mins}m`
-}

frontend/src/components/SummaryCard.tsx

@@ -1,31 +0,0 @@
-import type { LucideIcon } from 'lucide-react'
-
-interface SummaryCardProps {
-  title: string
-  value: string | number
-  icon: LucideIcon
-  color: 'emerald' | 'amber' | 'sky' | 'violet'
-}
-
-const colorMap = {
-  emerald: { bg: 'bg-emerald-500/10', border: 'border-emerald-500/20', text: 'text-emerald-400', icon: 'text-emerald-400' },
-  amber:   { bg: 'bg-amber-500/10',  border: 'border-amber-500/20',  text: 'text-amber-400',  icon: 'text-amber-400' },
-  sky:     { bg: 'bg-sky-500/10',    border: 'border-sky-500/20',    text: 'text-sky-400',    icon: 'text-sky-400' },
-  violet:  { bg: 'bg-violet-500/10', border: 'border-violet-500/20', text: 'text-violet-400', icon: 'text-violet-400' },
-}
-
-export default function SummaryCard({ title, value, icon: Icon, color }: SummaryCardProps) {
-  const c = colorMap[color]
-
-  return (
-    <div className={`rounded-xl border ${c.border} ${c.bg} p-5 flex items-start justify-between`}>
-      <div>
-        <p className="text-sm font-medium text-slate-400 mb-1">{title}</p>
-        <p className={`text-3xl font-bold ${c.text}`}>{value}</p>
-      </div>
-      <div className={`p-2 rounded-lg ${c.bg}`}>
-        <Icon size={24} className={c.icon} />
-      </div>
-    </div>
-  )
-}

frontend/src/components/ToastContainer.tsx

@@ -0,0 +1,70 @@
+import { useEffect, useState, useCallback } from 'react'
+import { X, CheckCircle, AlertTriangle, Info } from 'lucide-react'
+import { addToastListener, type ToastMessage } from '../hooks/useSSE'
+
+const ICONS = {
+  info: Info,
+  success: CheckCircle,
+  warning: AlertTriangle,
+}
+
+const STYLES = {
+  info: 'border-blue-600 bg-blue-900/40 text-blue-100',
+  success: 'border-emerald-600 bg-emerald-900/40 text-emerald-100',
+  warning: 'border-amber-600 bg-amber-900/40 text-amber-100',
+}
+
+export default function ToastContainer() {
+  const [toasts, setToasts] = useState<ToastMessage[]>([])
+
+  const remove = useCallback((id: string) => {
+    setToasts(prev => prev.filter(t => t.id !== id))
+  }, [])
+
+  useEffect(() => {
+    return addToastListener((toast) => {
+      setToasts(prev => {
+        // Prevent duplicate identical toasts within 3 seconds
+        const now = Date.now()
+        const recent = prev.filter(
+          t => t.title === toast.title && now - parseInt(t.id.split('-').pop() || '0', 10) < 3000
+        )
+        if (recent.length > 0) return prev
+        return [...prev.slice(-4), toast]
+      })
+      // Auto-dismiss after 5 seconds
+      setTimeout(() => remove(toast.id), 5000)
+    })
+  }, [remove])
+
+  return (
+    <div className="fixed bottom-4 right-4 z-50 flex flex-col gap-2 max-w-sm w-full pointer-events-none">
+      {toasts.map((toast) => {
+        const Icon = ICONS[toast.type]
+        return (
+          <div
+            key={toast.id}
+            className={`pointer-events-auto rounded-lg border px-4 py-3 shadow-lg backdrop-blur-sm transition-all ${STYLES[toast.type]}`}
+          >
+            <div className="flex items-start gap-3">
+              <Icon size={18} className="mt-0.5 shrink-0" />
+              <div className="flex-1 min-w-0">
+                <p className="text-sm font-semibold leading-snug">{toast.title}</p>
+                {toast.body && (
+                  <p className="text-xs opacity-80 mt-0.5">{toast.body}</p>
+                )}
+              </div>
+              <button
+                onClick={() => remove(toast.id)}
+                className="shrink-0 -mr-1 -mt-1 p-1 rounded hover:bg-white/10 text-current opacity-70 hover:opacity-100 transition-opacity"
+                aria-label="Dismiss"
+              >
+                <X size={14} />
+              </button>
+            </div>
+          </div>
+        )
+      })}
+    </div>
+  )
+}

frontend/src/hooks/useSSE.ts

@@ -0,0 +1,193 @@
+import { useEffect, useRef, useCallback } from 'react'
+import { useQueryClient } from '@tanstack/react-query'
+
+export type SSEEventType =
+  | 'printer.status'
+  | 'job.started'
+  | 'job.completed'
+  | 'filament.low'
+
+export interface SSEEvent {
+  type: SSEEventType
+  payload: unknown
+  timestamp: string
+}
+
+export interface ToastMessage {
+  id: string
+  type: 'info' | 'success' | 'warning'
+  title: string
+  body?: string
+}
+
+let toastListeners: Array<(toast: ToastMessage) => void> = []
+
+export function addToastListener(cb: (toast: ToastMessage) => void) {
+  toastListeners.push(cb)
+  return () => {
+    toastListeners = toastListeners.filter(l => l !== cb)
+  }
+}
+
+function emitToast(toast: ToastMessage) {
+  toastListeners.forEach(cb => cb(toast))
+}
+
+const RECONNECT_BASE_MS = 1000
+const RECONNECT_MAX_MS = 30000
+
+export function useSSE(enabled = true) {
+  const queryClient = useQueryClient()
+  const esRef = useRef<EventSource | null>(null)
+  const reconnectTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
+  const attemptRef = useRef(0)
+
+  const connect = useCallback(() => {
+    if (!enabled) return
+    if (esRef.current) {
+      esRef.current.close()
+    }
+
+    const es = new EventSource('/api/events')
+    esRef.current = es
+
+    es.onopen = () => {
+      attemptRef.current = 0
+    }
+
+    es.addEventListener('printer.status', (e) => {
+      try {
+        const data = JSON.parse(e.data) as SSEEvent
+        const payload = data.payload as {
+          printer_id: number
+          printer_name: string
+          status: string
+        }
+        // Update printer list cache if it exists
+        queryClient.setQueryData(['printers'], (old: unknown) => {
+          if (!Array.isArray(old)) return old
+          return old.map((p: any) =>
+            p.id === payload.printer_id
+              ? { ...p, status: payload.status, name: payload.printer_name }
+              : p
+          )
+        })
+      } catch {
+        // ignore malformed event
+      }
+    })
+
+    es.addEventListener('job.started', (e) => {
+      try {
+        const data = JSON.parse(e.data) as SSEEvent
+        const payload = data.payload as {
+          job_id: number
+          job_name: string
+          printer_id: number
+          spool_id?: number
+        }
+        emitToast({
+          id: `job-started-${payload.job_id}-${Date.now()}`,
+          type: 'info',
+          title: `Job started: ${payload.job_name}`,
+          body: `Printer #${payload.printer_id}`,
+        })
+        // Invalidate print jobs list
+        queryClient.invalidateQueries({ queryKey: ['print-jobs'] })
+      } catch {
+        // ignore malformed event
+      }
+    })
+
+    es.addEventListener('job.completed', (e) => {
+      try {
+        const data = JSON.parse(e.data) as SSEEvent
+        const payload = data.payload as {
+          job_id: number
+          job_name: string
+          printer_id: number
+          duration_seconds?: number
+          total_grams_used?: number
+          total_cost_usd?: number
+        }
+        const parts: string[] = []
+        if (payload.duration_seconds != null) {
+          const mins = Math.round(payload.duration_seconds / 60)
+          parts.push(`${mins} min`)
+        }
+        if (payload.total_grams_used != null) {
+          parts.push(`${payload.total_grams_used.toFixed(1)} g used`)
+        }
+        emitToast({
+          id: `job-completed-${payload.job_id}-${Date.now()}`,
+          type: 'success',
+          title: `Job completed: ${payload.job_name}`,
+          body: parts.join(' · ') || `Printer #${payload.printer_id}`,
+        })
+        queryClient.invalidateQueries({ queryKey: ['print-jobs'] })
+        queryClient.invalidateQueries({ queryKey: ['filaments'] })
+      } catch {
+        // ignore malformed event
+      }
+    })
+
+    es.addEventListener('filament.low', (e) => {
+      try {
+        const data = JSON.parse(e.data) as SSEEvent
+        const payload = data.payload as {
+          spool_id: number
+          spool_name: string
+          remaining_grams: number
+          threshold_grams: number
+        }
+        emitToast({
+          id: `filament-low-${payload.spool_id}-${Date.now()}`,
+          type: 'warning',
+          title: `Low filament: ${payload.spool_name}`,
+          body: `${payload.remaining_grams} g remaining (threshold ${payload.threshold_grams} g)`,
+        })
+        // Update filament inventory cache in place for instant UI feedback
+        queryClient.setQueryData(['filaments'], (old: unknown) => {
+          if (!old || typeof old !== 'object') return old
+          const o = old as { data?: Array<Record<string, unknown>>; total?: number }
+          if (!Array.isArray(o.data)) return old
+          return {
+            ...o,
+            data: o.data.map((f) =>
+              (f.id as number) === payload.spool_id
+                ? { ...f, remaining_grams: payload.remaining_grams }
+                : f
+            ),
+          }
+        })
+      } catch {
+        // ignore malformed event
+      }
+    })
+
+    es.onerror = () => {
+      es.close()
+      // Exponential backoff with jitter
+      const base = Math.min(RECONNECT_MAX_MS, RECONNECT_BASE_MS * 2 ** attemptRef.current)
+      const jitter = Math.random() * 1000
+      const delay = base + jitter
+      attemptRef.current += 1
+      reconnectTimerRef.current = setTimeout(() => {
+        connect()
+      }, delay)
+    }
+  }, [enabled, queryClient])
+
+  useEffect(() => {
+    connect()
+    return () => {
+      if (reconnectTimerRef.current) {
+        clearTimeout(reconnectTimerRef.current)
+      }
+      if (esRef.current) {
+        esRef.current.close()
+        esRef.current = null
+      }
+    }
+  }, [connect])
+}

frontend/src/main.tsx

@@ -1,25 +1,10 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
-import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
-import { BrowserRouter } from 'react-router-dom'
 import './index.css'
 import App from './App'
 
-const queryClient = new QueryClient({
-  defaultOptions: {
-    queries: {
-      staleTime: 30_000,
-      refetchOnWindowFocus: false,
-    },
-  },
-})
-
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
-    <QueryClientProvider client={queryClient}>
-      <BrowserRouter>
     <App />
-      </BrowserRouter>
-    </QueryClientProvider>
   </StrictMode>,
 )

frontend/src/pages/Dashboard.tsx

@@ -1,139 +0,0 @@
-import { useQuery } from '@tanstack/react-query'
-import { getFilaments, getPrintJobs } from '../services/api'
-import SummaryCard from '../components/SummaryCard'
-import RecentPrints from '../components/RecentPrints'
-import LoadingSpinner from '../components/LoadingSpinner'
-import { Package, AlertTriangle, Printer, DollarSign, Plus, List } from 'lucide-react'
-
-export default function Dashboard() {
-  const {
-    data: filamentData,
-    isLoading: filamentLoading,
-    error: filamentError,
-  } = useQuery({
-    queryKey: ['filaments', 'count'],
-    queryFn: () => getFilaments({ limit: 1 }),
-  })
-
-  const {
-    data: lowStockData,
-    isLoading: lowStockLoading,
-    error: lowStockError,
-  } = useQuery({
-    queryKey: ['filaments', 'lowStock'],
-    queryFn: () => getFilaments({ low_stock: true, limit: 1 }),
-  })
-
-  const {
-    data: recentPrints,
-    isLoading: printsLoading,
-    error: printsError,
-  } = useQuery({
-    queryKey: ['printJobs', 'recent'],
-    queryFn: () => getPrintJobs({ limit: 5 }),
-  })
-
-  const {
-    data: allPrints,
-    isLoading: costLoading,
-    error: costError,
-  } = useQuery({
-    queryKey: ['printJobs', 'all'],
-    queryFn: () => getPrintJobs({ limit: 1000 }),
-  })
-
-  const totalSpools = filamentData?.total ?? 0
-  const lowStockCount = lowStockData?.total ?? 0
-  const recentPrintJobs = recentPrints?.data ?? []
-
-  // Calculate cost this month from all print jobs
-  const now = new Date()
-  const currentMonth = now.getMonth()
-  const currentYear = now.getFullYear()
-  const monthlyCost =
-    allPrints?.data
-      .filter((job) => {
-        const d = new Date(job.started_at)
-        return d.getMonth() === currentMonth && d.getFullYear() === currentYear
-      })
-      .reduce((sum, job) => sum + (job.cost_usd ?? 0), 0) ?? 0
-
-  const isLoading = filamentLoading || lowStockLoading || printsLoading || costLoading
-  const error = filamentError || lowStockError || printsError || costError
-
-  if (isLoading) {
-    return (
-      <div className="min-h-screen flex items-center justify-center bg-slate-900">
-        <LoadingSpinner />
-      </div>
-    )
-  }
-
-  if (error) {
-    return (
-      <div className="min-h-screen flex items-center justify-center bg-slate-900">
-        <div className="p-6 rounded-lg bg-red-900/30 border border-red-500 text-red-200 max-w-md">
-          <h2 className="text-xl font-bold mb-2">Error</h2>
-          <p className="text-sm">{(error as Error).message || 'Failed to load dashboard data.'}</p>
-        </div>
-      </div>
-    )
-  }
-
-  return (
-    <div className="min-h-screen bg-slate-900 p-4 md:p-8">
-      <div className="max-w-6xl mx-auto">
-        <header className="mb-8">
-          <h1 className="text-3xl font-bold text-emerald-400 mb-2">Dashboard</h1>
-          <p className="text-slate-400">Overview of your Extrudex inventory and prints</p>
-        </header>
-
-        {/* Summary Cards Grid */}
-        <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4 mb-8">
-          <SummaryCard
-            title="Total Spools"
-            value={totalSpools}
-            icon={Package}
-            color="emerald"
-          />
-          <SummaryCard
-            title="Low Stock"
-            value={lowStockCount}
-            icon={AlertTriangle}
-            color={lowStockCount > 0 ? 'amber' : 'emerald'}
-          />
-          <SummaryCard
-            title="Recent Prints"
-            value={recentPrintJobs.length}
-            icon={Printer}
-            color="sky"
-          />
-          <SummaryCard
-            title="Cost This Month"
-            value={`$${monthlyCost.toFixed(2)}`}
-            icon={DollarSign}
-            color="violet"
-          />
-        </div>
-
-        {/* Quick Actions */}
-        <div className="flex flex-wrap gap-3 mb-8">
-          <button className="flex items-center gap-2 px-4 py-2 rounded-lg bg-emerald-600 hover:bg-emerald-500 text-white font-medium transition-colors active:scale-95 touch-manipulation">
-            <Plus size={18} />
-            Add Spool
-          </button>
-          <button className="flex items-center gap-2 px-4 py-2 rounded-lg bg-slate-700 hover:bg-slate-600 text-slate-100 font-medium transition-colors active:scale-95 touch-manipulation">
-            <List size={18} />
-            View Inventory
-          </button>
-        </div>
-
-        {/* Recent Prints Section */}
-        <section>
-          <h2 className="text-xl font-semibold text-slate-100 mb-4">Recent Prints</h2>
-          <RecentPrints jobs={recentPrintJobs} />
-        </section>
-      </div>
-    </div>
-  )
-}

frontend/src/pages/PrintersPage.tsx

@@ -1,262 +0,0 @@
-import { useQuery } from '@tanstack/react-query'
-import { Printer, Wifi, WifiOff, HelpCircle, Plus, Globe, Radio } from 'lucide-react'
-import { fetchPrinters } from '../services/printerService'
-import LoadingSpinner from '../components/LoadingSpinner'
-import type { Printer as PrinterType, ConnectionStatus } from '../types/printer'
-
-function getConnectionStatus(printer: PrinterType): ConnectionStatus {
-  if (!printer.is_active) return 'offline'
-  if (printer.moonraker_url || printer.mqtt_broker_host) return 'online'
-  return 'unknown'
-}
-
-const statusConfig: Record<ConnectionStatus, { icon: typeof Wifi; label: string; className: string }> = {
-  online: {
-    icon: Wifi,
-    label: 'Online',
-    className: 'bg-emerald-900/30 border-emerald-700 text-emerald-300',
-  },
-  offline: {
-    icon: WifiOff,
-    label: 'Offline',
-    className: 'bg-red-900/30 border-red-700 text-red-300',
-  },
-  unknown: {
-    icon: HelpCircle,
-    label: 'Unknown',
-    className: 'bg-slate-700/50 border-slate-600 text-slate-400',
-  },
-}
-
-export default function PrintersPage() {
-  const { data: printers, isLoading, error, refetch } = useQuery({
-    queryKey: ['printers'],
-    queryFn: fetchPrinters,
-  })
-
-  const count = printers?.length ?? 0
-
-  return (
-    <div className="space-y-4">
-      {/* Header */}
-      <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3">
-        <div>
-          <h2 className="text-xl font-bold text-slate-100">Printers</h2>
-          <p className="text-sm text-slate-400">{count} printer(s) in fleet</p>
-        </div>
-        <button className="inline-flex items-center gap-2 rounded-lg bg-emerald-600 px-4 py-2 text-sm font-semibold text-white hover:bg-emerald-500 active:bg-emerald-700 transition-colors">
-          <Plus size={16} /> Add Printer
-        </button>
-      </div>
-
-      {/* Loading */}
-      {isLoading && (
-        <div className="flex items-center justify-center py-16">
-          <LoadingSpinner />
-        </div>
-      )}
-
-      {/* Error */}
-      {error && (
-        <div className="rounded-lg border border-red-700 bg-red-900/20 p-6 text-center">
-          <p className="text-red-400 mb-2">Failed to load printers.</p>
-          <button
-            onClick={() => refetch()}
-            className="text-sm text-red-300 underline hover:text-red-200"
-          >
-            Retry
-          </button>
-        </div>
-      )}
-
-      {/* Empty */}
-      {!isLoading && !error && printers?.length === 0 && (
-        <div className="rounded-lg border border-slate-700 bg-slate-800 p-12 text-center">
-          <Printer size={40} className="mx-auto mb-3 text-slate-500" />
-          <p className="text-slate-400">No printers found.</p>
-          <p className="text-sm text-slate-500 mt-1">
-            Add a printer to start monitoring your fleet.
-          </p>
-        </div>
-      )}
-
-      {/* Desktop Table */}
-      {!isLoading && !error && (printers?.length ?? 0) > 0 && (
-        <>
-          <div className="hidden lg:block overflow-x-auto rounded-lg border border-slate-700">
-            <table className="w-full text-sm">
-              <thead className="bg-slate-800 text-slate-300">
-                <tr>
-                  <th className="px-4 py-3 text-left font-semibold">Name</th>
-                  <th className="px-4 py-3 text-left font-semibold">Type</th>
-                  <th className="px-4 py-3 text-left font-semibold">Manufacturer</th>
-                  <th className="px-4 py-3 text-left font-semibold">Model</th>
-                  <th className="px-4 py-3 text-center font-semibold">Status</th>
-                  <th className="px-4 py-3 text-left font-semibold">Moonraker</th>
-                  <th className="px-4 py-3 text-left font-semibold">MQTT</th>
-                </tr>
-              </thead>
-              <tbody className="divide-y divide-slate-700">
-                {printers!.map((printer) => {
-                  const status = getConnectionStatus(printer)
-                  const StatusIcon = statusConfig[status].icon
-                  return (
-                    <tr
-                      key={printer.id}
-                      className="bg-slate-800/50 hover:bg-slate-700/50 transition-colors"
-                    >
-                      <td className="px-4 py-3 font-medium text-slate-100">
-                        {printer.name}
-                      </td>
-                      <td className="px-4 py-3 text-slate-300">
-                        {printer.printer_type?.name ?? '—'}
-                      </td>
-                      <td className="px-4 py-3 text-slate-300">
-                        {printer.manufacturer || '—'}
-                      </td>
-                      <td className="px-4 py-3 text-slate-300">
-                        {printer.model || '—'}
-                      </td>
-                      <td className="px-4 py-3 text-center">
-                        <span
-                          className={`inline-flex items-center gap-1.5 rounded-full border px-2.5 py-0.5 text-xs font-medium ${statusConfig[status].className}`}
-                        >
-                          <StatusIcon size={12} />
-                          {statusConfig[status].label}
-                        </span>
-                      </td>
-                      <td className="px-4 py-3">
-                        {printer.moonraker_url ? (
-                          <a
-                            href={printer.moonraker_url}
-                            target="_blank"
-                            rel="noopener noreferrer"
-                            className="inline-flex items-center gap-1.5 text-sky-400 hover:text-sky-300 text-xs truncate max-w-[180px]"
-                            title={printer.moonraker_url}
-                          >
-                            <Globe size={12} className="shrink-0" />
-                            {printer.moonraker_url}
-                          </a>
-                        ) : (
-                          <span className="text-slate-500 text-xs">—</span>
-                        )}
-                      </td>
-                      <td className="px-4 py-3">
-                        {printer.mqtt_broker_host ? (
-                          <div className="space-y-0.5">
-                            <div className="inline-flex items-center gap-1.5 text-xs text-slate-300">
-                              <Radio size={12} className="shrink-0 text-amber-400" />
-                              <span className="truncate max-w-[140px]" title={printer.mqtt_broker_host}>
-                                {printer.mqtt_broker_host}
-                              </span>
-                            </div>
-                            {printer.mqtt_topic_prefix && (
-                              <div className="text-xs text-slate-500 ml-[20px] truncate max-w-[140px]" title={printer.mqtt_topic_prefix}>
-                                topic: {printer.mqtt_topic_prefix}
-                              </div>
-                            )}
-                            <div className="text-xs text-slate-500 ml-[20px]">
-                              TLS: {printer.mqtt_tls_enabled ? 'on' : 'off'}
-                            </div>
-                          </div>
-                        ) : (
-                          <span className="text-slate-500 text-xs">—</span>
-                        )}
-                      </td>
-                    </tr>
-                  )
-                })}
-              </tbody>
-            </table>
-          </div>
-
-          {/* Mobile / Tablet Cards */}
-          <div className="lg:hidden space-y-3">
-            {printers!.map((printer) => {
-              const status = getConnectionStatus(printer)
-              const StatusIcon = statusConfig[status].icon
-              return (
-                <div
-                  key={printer.id}
-                  className="rounded-lg border border-slate-700 bg-slate-800 p-4 space-y-3"
-                >
-                  {/* Top row: name + status */}
-                  <div className="flex items-start justify-between gap-3">
-                    <div className="min-w-0">
-                      <div className="font-semibold text-slate-100 truncate">
-                        {printer.name}
-                      </div>
-                      <div className="text-xs text-slate-400 mt-0.5">
-                        {[
-                          printer.printer_type?.name,
-                          printer.manufacturer,
-                          printer.model,
-                        ]
-                          .filter(Boolean)
-                          .join(' · ') || 'No details'}
-                      </div>
-                    </div>
-                    <span
-                      className={`inline-flex items-center gap-1.5 rounded-full border px-2.5 py-0.5 text-xs font-medium shrink-0 ${statusConfig[status].className}`}
-                    >
-                      <StatusIcon size={12} />
-                      {statusConfig[status].label}
-                    </span>
-                  </div>
-
-                  {/* Connection details */}
-                  <div className="grid grid-cols-1 sm:grid-cols-2 gap-3">
-                    {/* Moonraker */}
-                    <div className="rounded-md bg-slate-900/50 p-3 min-w-0">
-                      <div className="flex items-center gap-1.5 text-xs text-slate-400 mb-1">
-                        <Globe size={12} />
-                        Moonraker
-                      </div>
-                      {printer.moonraker_url ? (
-                        <a
-                          href={printer.moonraker_url}
-                          target="_blank"
-                          rel="noopener noreferrer"
-                          className="text-xs text-sky-400 hover:text-sky-300 break-all"
-                        >
-                          {printer.moonraker_url}
-                        </a>
-                      ) : (
-                        <span className="text-xs text-slate-500">Not configured</span>
-                      )}
-                    </div>
-
-                    {/* MQTT */}
-                    <div className="rounded-md bg-slate-900/50 p-3 min-w-0">
-                      <div className="flex items-center gap-1.5 text-xs text-slate-400 mb-1">
-                        <Radio size={12} />
-                        MQTT
-                      </div>
-                      {printer.mqtt_broker_host ? (
-                        <div className="space-y-0.5 text-xs text-slate-300">
-                          <div className="truncate" title={printer.mqtt_broker_host}>
-                            {printer.mqtt_broker_host}
-                          </div>
-                          {printer.mqtt_topic_prefix && (
-                            <div className="text-slate-500 truncate" title={printer.mqtt_topic_prefix}>
-                              topic: {printer.mqtt_topic_prefix}
-                            </div>
-                          )}
-                          <div className="text-slate-500">
-                            TLS: {printer.mqtt_tls_enabled ? 'on' : 'off'}
-                          </div>
-                        </div>
-                      ) : (
-                        <span className="text-xs text-slate-500">Not configured</span>
-                      )}
-                    </div>
-                  </div>
-                </div>
-              )
-            })}
-          </div>
-        </>
-      )}
-    </div>
-  )
-}

frontend/src/services/api.ts

@@ -1,19 +0,0 @@
-import axios from 'axios'
-import type { ListResponse, FilamentSpool, PrintJob } from '../types'
-
-const api = axios.create({
-  baseURL: '/api',
-  headers: { 'Content-Type': 'application/json' },
-})
-
-export async function getFilaments(params?: { low_stock?: boolean; limit?: number; offset?: number }) {
-  const res = await api.get<ListResponse<FilamentSpool>>('/filaments', { params })
-  return res.data
-}
-
-export async function getPrintJobs(params?: { limit?: number; offset?: number }) {
-  const res = await api.get<ListResponse<PrintJob>>('/print-jobs', { params })
-  return res.data
-}
-
-export default api

frontend/src/services/printerService.ts

@@ -1,9 +0,0 @@
-import axios from 'axios'
-import type { Printer, PrinterResponse } from '../types/printer'
-
-const API_BASE = '/api'
-
-export async function fetchPrinters(): Promise<Printer[]> {
-  const res = await axios.get<PrinterResponse>(`${API_BASE}/printers`)
-  return res.data.data
-}

frontend/src/types/index.ts

@@ -1,42 +0,0 @@
-export interface FilamentSpool {
-  id: number;
-  name: string;
-  material_base_id: number;
-  material_finish_id: number;
-  material_modifier_id: number;
-  color_hex: string;
-  brand: string;
-  diameter_mm: number;
-  initial_grams: number;
-  remaining_grams: number;
-  spool_weight_grams: number;
-  cost_usd: number;
-  low_stock_threshold_grams: number;
-  notes: string;
-  barcode: string;
-  created_at: string;
-  updated_at: string;
-  deleted_at: string | null;
-}
-
-export interface PrintJob {
-  id: number;
-  name: string;
-  printer_id: number;
-  filament_id: number;
-  status: string;
-  duration_seconds: number;
-  filament_used_grams: number;
-  cost_usd: number;
-  started_at: string;
-  completed_at: string | null;
-  created_at: string;
-  updated_at: string;
-}
-
-export interface ListResponse<T> {
-  data: T[];
-  total: number;
-  limit: number;
-  offset: number;
-}

frontend/src/types/printer.ts

@@ -1,29 +0,0 @@
-export interface PrinterType {
-  id: number
-  name: string
-  created_at: string
-  updated_at: string
-}
-
-export interface Printer {
-  id: number
-  name: string
-  printer_type_id: number
-  printer_type?: PrinterType
-  manufacturer?: string
-  model?: string
-  moonraker_url?: string
-  moonraker_api_key?: string
-  mqtt_broker_host?: string
-  mqtt_topic_prefix?: string
-  mqtt_tls_enabled: boolean
-  is_active: boolean
-  created_at: string
-  updated_at: string
-}
-
-export type ConnectionStatus = 'online' | 'offline' | 'unknown'
-
-export interface PrinterResponse {
-  data: Printer[]
-}

frontend/tsconfig.json

@@ -15,7 +15,6 @@
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "noFallthroughCasesInSwitch": true,
-    "ignoreDeprecations": "5.0",
     "baseUrl": ".",
     "paths": {
       "@/*": ["src/*"]