CUB-129: fix lint warning in useMemo and add typescript-eslint dev dep

- Add PrintJob types (PrintJob, PrintJobFilter) with status union type
- Add printJobService.ts using axios + TanStack Query
- Build PrintJobsPage.tsx with:
  - Desktop table: job name, printer, color-coded status badge, started time, duration, filament used, cost
  - Mobile card layout with grid-based info display
  - Filter by status (pending/printing/completed/failed)
  - Filter by printer name
  - Sort by any column (name, started_at, duration, filament, cost)
  - Pagination with 20 per page
  - Loading spinner, error with retry, empty state
  - Client-side text search by job/printer name
  - Duration formatting (h/m/s)
- Add navigation bar in App.tsx with Inventory + Print Jobs tabs using NavLink

frontend/package-lock.json

@@ -25,7 +25,6 @@
         "eslint": "^9.15.0",
         "eslint-plugin-react-hooks": "^5.0.0",
         "eslint-plugin-react-refresh": "^0.4.14",
-        "globals": "^17.6.0",
         "postcss": "^8.4.49",
         "tailwindcss": "^4.0.0",
         "typescript": "~5.6.0",
@@ -824,18 +823,6 @@
         "url": "https://opencollective.com/eslint"
       }
     },
-    "node_modules/@eslint/eslintrc/node_modules/globals": {
-      "version": "14.0.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
-      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
-      "dev": true,
-      "engines": {
-        "node": ">=18"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/@eslint/js": {
       "version": "9.39.4",
       "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.39.4.tgz",
@@ -2821,9 +2808,9 @@
       }
     },
     "node_modules/globals": {
-      "version": "17.6.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-17.6.0.tgz",
-      "integrity": "sha512-sepffkT8stwnIYbsMBpoCHJuJM5l98FUF2AnE07hfvE0m/qp3R586hw4jF4uadbhvg1ooIdzuu7CsfD2jzCaNA==",
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
       "dev": true,
       "engines": {
         "node": ">=18"

frontend/package.json

@@ -27,7 +27,6 @@
     "eslint": "^9.15.0",
     "eslint-plugin-react-hooks": "^5.0.0",
     "eslint-plugin-react-refresh": "^0.4.14",
-    "globals": "^17.6.0",
     "postcss": "^8.4.49",
     "tailwindcss": "^4.0.0",
     "typescript": "~5.6.0",

frontend/src/App.tsx

@@ -1,38 +1,51 @@
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
-import { BrowserRouter, Routes, Route } from 'react-router-dom'
+import { BrowserRouter, Routes, Route, NavLink } from 'react-router-dom'
+import { Box, Printer } from 'lucide-react'
 import Dashboard from './pages/Dashboard'
 import InventoryPage from './pages/InventoryPage'
-import FilamentDetailPage from './pages/FilamentDetailPage'
-import ToastContainer from './components/ToastContainer'
-import { useSSE } from './hooks/useSSE'
+import PrintJobsPage from './pages/PrintJobsPage'
 
 const queryClient = new QueryClient()
 
-function SSEProvider({ children }: { children: React.ReactNode }) {
-  useSSE()
-  return <>{children}</>
+function NavItem({ to, icon: Icon, label }: { to: string; icon: React.ComponentType<{ size?: number }>; label: string }) {
+  return (
+    <NavLink
+      to={to}
+      className={({ isActive }) =>
+        `inline-flex items-center gap-2 rounded-lg px-3 py-2 text-sm font-medium transition-colors ${
+          isActive
+            ? 'bg-emerald-600/20 text-emerald-300 border border-emerald-700'
+            : 'text-slate-400 hover:text-slate-200 hover:bg-slate-700/50'
+        }`
+      }
+    >
+      <Icon size={16} /> {label}
+    </NavLink>
+  )
 }
 
 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-3 sticky top-0 z-20">
-              <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">Extrudex</h1>
-            </header>
-            <main className="p-4">
-              <Routes>
-                <Route path="/" element={<Dashboard />} />
-                <Route path="/inventory" element={<InventoryPage />} />
-                <Route path="/filament/:id" element={<FilamentDetailPage />} />
-              </Routes>
-            </main>
-          </div>
-          <ToastContainer />
-        </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-3 sticky top-0 z-20">
+            <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">Extrudex</h1>
+            <nav className="ml-6 flex items-center gap-1">
+              <NavItem to="/" icon={Box} label="Dashboard" />
+              <NavItem to="/inventory" icon={Box} label="Inventory" />
+              <NavItem to="/print-jobs" icon={Printer} label="Print Jobs" />
+            </nav>
+          </header>
+          <main className="p-4">
+            <Routes>
+              <Route path="/" element={<Dashboard />} />
+              <Route path="/inventory" element={<InventoryPage />} />
+              <Route path="/print-jobs" element={<PrintJobsPage />} />
+            </Routes>
+          </main>
+        </div>
       </BrowserRouter>
     </QueryClientProvider>
   )

frontend/src/components/PrinterStatusBadge.tsx

@@ -1,17 +0,0 @@
-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/ToastContainer.tsx

@@ -1,70 +0,0 @@
-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

@@ -1,193 +0,0 @@
-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: Record<string, unknown>) =>
-            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/pages/FilamentDetailPage.tsx

@@ -1,391 +0,0 @@
-import { useState } from 'react'
-import { useParams, useNavigate } from 'react-router-dom'
-import { useQuery, useQueryClient } from '@tanstack/react-query'
-import { ArrowLeft, Pencil, Trash2, AlertTriangle, Loader2, Archive } from 'lucide-react'
-import ColorSwatch from '../components/ColorSwatch'
-import { fetchFilamentById, fetchUsageLogs, deleteFilament } from '../services/filamentService'
-import type { UsageLog } from '../types/filament'
-
-export default function FilamentDetailPage() {
-  const { id } = useParams<{ id: string }>()
-  const spoolId = Number(id)
-  const navigate = useNavigate()
-  const queryClient = useQueryClient()
-  const [deleteConfirm, setDeleteConfirm] = useState(false)
-  const [deleting, setDeleting] = useState(false)
-
-  const {
-    data: spool,
-    isLoading: spoolLoading,
-    error: spoolError,
-    refetch: refetchSpool,
-  } = useQuery({
-    queryKey: ['filament', spoolId],
-    queryFn: () => fetchFilamentById(spoolId),
-    enabled: !isNaN(spoolId),
-  })
-
-  const {
-    data: usageLogs,
-    isLoading: usageLoading,
-    error: usageError,
-    refetch: refetchUsage,
-  } = useQuery({
-    queryKey: ['usage-logs', spoolId],
-    queryFn: () => fetchUsageLogs(spoolId),
-    enabled: !isNaN(spoolId),
-  })
-
-  const handleDelete = async () => {
-    setDeleting(true)
-    try {
-      await deleteFilament(spoolId)
-      queryClient.invalidateQueries({ queryKey: ['filaments'] })
-      navigate('/')
-    } catch {
-      setDeleting(false)
-      setDeleteConfirm(false)
-    }
-  }
-
-  // ── Loading state ──
-  if (spoolLoading) {
-    return (
-      <div className="flex flex-col items-center justify-center py-24 gap-3 text-slate-400">
-        <Loader2 size={32} className="animate-spin text-emerald-400" />
-        <span>Loading spool details…</span>
-      </div>
-    )
-  }
-
-  // ── Error state ──
-  if (spoolError || !spool) {
-    return (
-      <div className="flex flex-col items-center justify-center py-24 gap-4">
-        <div className="flex h-14 w-14 items-center justify-center rounded-full bg-red-900/30">
-          <AlertTriangle size={28} className="text-red-400" />
-        </div>
-        <p className="text-red-400 font-medium">Failed to load spool details.</p>
-        <div className="flex gap-3">
-          <button
-            onClick={() => refetchSpool()}
-            className="rounded-lg bg-slate-700 px-4 py-2 text-sm font-medium text-slate-200 hover:bg-slate-600 transition-colors"
-          >
-            Retry
-          </button>
-          <button
-            onClick={() => navigate('/')}
-            className="rounded-lg bg-slate-800 border border-slate-700 px-4 py-2 text-sm font-medium text-slate-300 hover:bg-slate-700 transition-colors"
-          >
-            Back to Inventory
-          </button>
-        </div>
-      </div>
-    )
-  }
-
-  const pctRemaining = spool.initial_grams > 0
-    ? (spool.remaining_grams / spool.initial_grams) * 100
-    : 0
-  const isLow = spool.remaining_grams <= (spool.low_stock_threshold_grams || 0)
-
-  return (
-    <div className="space-y-6">
-      {/* ── Header Bar ── */}
-      <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3">
-        <button
-          onClick={() => navigate('/')}
-          className="inline-flex items-center gap-2 rounded-lg bg-slate-800 border border-slate-700 px-3 py-2 text-sm font-medium text-slate-200 hover:bg-slate-700 active:bg-slate-600 transition-colors w-fit"
-        >
-          <ArrowLeft size={16} />
-          Back to Inventory
-        </button>
-
-        <div className="flex items-center gap-2">
-          <button className="inline-flex items-center gap-2 rounded-lg bg-slate-700 px-4 py-2 text-sm font-semibold text-slate-200 hover:bg-slate-600 active:bg-slate-500 transition-colors">
-            <Pencil size={16} />
-            Edit
-          </button>
-          <button
-            onClick={() => setDeleteConfirm(true)}
-            className="inline-flex items-center gap-2 rounded-lg bg-red-900/30 border border-red-700 px-4 py-2 text-sm font-semibold text-red-300 hover:bg-red-900/50 active:bg-red-900/70 transition-colors"
-          >
-            <Trash2 size={16} />
-            Delete
-          </button>
-        </div>
-      </div>
-
-      {/* ── Spool Info Card ── */}
-      <div className="rounded-xl border border-slate-700 bg-slate-800 overflow-hidden">
-        {/* Card header */}
-        <div className="px-6 py-5 border-b border-slate-700 flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3">
-          <div className="flex items-center gap-3">
-            <ColorSwatch colorHex={spool.color_hex} size={36} />
-            <div>
-              <h1 className="text-xl font-bold text-slate-100">{spool.name}</h1>
-              <p className="text-sm text-slate-400">
-                {spool.brand && <span>{spool.brand} · </span>}
-                {spool.diameter_mm}mm
-              </p>
-            </div>
-          </div>
-          <div>
-            {isLow ? (
-              <span className="inline-flex items-center gap-1.5 rounded-full bg-red-900/40 border border-red-700 px-3 py-1 text-sm font-medium text-red-300">
-                <AlertTriangle size={14} /> Low Stock
-              </span>
-            ) : (
-              <span className="inline-flex items-center gap-1.5 rounded-full bg-emerald-900/30 border border-emerald-700 px-3 py-1 text-sm font-medium text-emerald-300">
-                In Stock
-              </span>
-            )}
-          </div>
-        </div>
-
-        {/* Card body — 2-column grid */}
-        <div className="px-6 py-5 grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-x-8 gap-y-4">
-          <DetailItem label="Material" value={spool.material_base?.name ?? '—'} />
-          <DetailItem label="Finish" value={spool.material_finish?.name ?? '—'} />
-          <DetailItem
-            label="Modifier"
-            value={spool.material_modifier?.name ?? 'None'}
-          />
-          <DetailItem label="Color" value={spool.color_hex.toUpperCase()} />
-          <DetailItem label="Brand" value={spool.brand || '—'} />
-          <DetailItem label="Diameter" value={`${spool.diameter_mm}mm`} />
-          <DetailItem
-            label="Remaining"
-            value={
-              <span className="font-semibold tabular-nums">
-                {spool.remaining_grams.toLocaleString()} g
-              </span>
-            }
-          />
-          <DetailItem
-            label="Initial"
-            value={`${spool.initial_grams.toLocaleString()} g`}
-          />
-          <DetailItem
-            label="Cost"
-            value={
-              spool.cost_usd != null
-                ? `$${spool.cost_usd.toFixed(2)}`
-                : '—'
-            }
-          />
-        </div>
-
-        {/* Progress Bar */}
-        <div className="px-6 pb-5 pt-1">
-          <div className="flex items-center justify-between text-sm mb-1.5">
-            <span className="text-slate-400">
-              <span className="text-slate-200 font-semibold tabular-nums">
-                {spool.remaining_grams.toLocaleString()}g
-              </span>{' '}
-              of {spool.initial_grams.toLocaleString()}g
-            </span>
-            <span className="text-slate-400 font-medium tabular-nums">
-              {pctRemaining.toFixed(1)}%
-            </span>
-          </div>
-          <div className="w-full h-3 rounded-full bg-slate-700 overflow-hidden">
-            <div
-              className={`h-full rounded-full transition-all duration-500 ${
-                pctRemaining <= 10
-                  ? 'bg-red-500'
-                  : pctRemaining <= 25
-                    ? 'bg-amber-500'
-                    : 'bg-emerald-500'
-              }`}
-              style={{ width: `${Math.min(100, pctRemaining)}%` }}
-            />
-          </div>
-        </div>
-      </div>
-
-      {/* ── Usage History ── */}
-      <div className="rounded-xl border border-slate-700 bg-slate-800 overflow-hidden">
-        <div className="px-6 py-4 border-b border-slate-700">
-          <h2 className="text-lg font-semibold text-slate-100">Usage History</h2>
-        </div>
-
-        {/* Loading sub-state */}
-        {usageLoading && (
-          <div className="px-6 py-8 text-center text-slate-400">
-            <Loader2 size={20} className="animate-spin inline mr-2" />
-            Loading usage history…
-          </div>
-        )}
-
-        {/* Usage error sub-state */}
-        {usageError && !usageLoading && (
-          <div className="px-6 py-8 text-center">
-            <p className="text-red-400 text-sm">
-              Failed to load usage history.
-            </p>
-            <button
-              onClick={() => refetchUsage()}
-              className="mt-2 text-sm text-emerald-400 hover:text-emerald-300 underline"
-            >
-              Retry
-            </button>
-          </div>
-        )}
-
-        {/* Empty state */}
-        {!usageLoading && !usageError && usageLogs && usageLogs.length === 0 && (
-          <div className="px-6 py-10 text-center">
-            <Archive size={32} className="mx-auto text-slate-600 mb-2" />
-            <p className="text-slate-400 text-sm">No usage recorded yet.</p>
-            <p className="text-slate-500 text-xs mt-1">
-              Usage data will appear here when this spool is used in print jobs.
-            </p>
-          </div>
-        )}
-
-        {/* Table — desktop */}
-        {!usageLoading && !usageError && usageLogs && usageLogs.length > 0 && (
-          <>
-            <div className="hidden md:block overflow-x-auto">
-              <table className="w-full text-sm">
-                <thead className="bg-slate-800/50 text-slate-300">
-                  <tr>
-                    <th className="px-6 py-3 text-left font-semibold">Date</th>
-                    <th className="px-6 py-3 text-left font-semibold">Print Job</th>
-                    <th className="px-6 py-3 text-right font-semibold">mm Extruded</th>
-                    <th className="px-6 py-3 text-right font-semibold">Grams Used</th>
-                    <th className="px-6 py-3 text-right font-semibold">Cost</th>
-                  </tr>
-                </thead>
-                <tbody className="divide-y divide-slate-700">
-                  {usageLogs.map((log: UsageLog) => (
-                    <tr
-                      key={log.id}
-                      className="hover:bg-slate-700/30 transition-colors"
-                    >
-                      <td className="px-6 py-3 text-slate-200 tabular-nums">
-                        {new Date(log.logged_at).toLocaleDateString('en-US', {
-                          year: 'numeric',
-                          month: 'short',
-                          day: 'numeric',
-                        })}
-                      </td>
-                      <td className="px-6 py-3 text-slate-300">
-                        {log.print_job_name || `Job #${log.print_job_id ?? log.id}`}
-                      </td>
-                      <td className="px-6 py-3 text-right text-slate-200 tabular-nums">
-                        {log.mm_extruded.toLocaleString()}
-                      </td>
-                      <td className="px-6 py-3 text-right text-slate-200 tabular-nums">
-                        {log.grams_used.toFixed(2)} g
-                      </td>
-                      <td className="px-6 py-3 text-right text-slate-200 tabular-nums">
-                        {log.cost_usd != null ? `$${log.cost_usd.toFixed(3)}` : '—'}
-                      </td>
-                    </tr>
-                  ))}
-                </tbody>
-              </table>
-            </div>
-
-            {/* Mobile cards */}
-            <div className="md:hidden divide-y divide-slate-700">
-              {usageLogs.map((log: UsageLog) => (
-                <div key={log.id} className="px-4 py-4 space-y-2">
-                  <div className="flex items-center justify-between">
-                    <span className="text-sm font-medium text-slate-200">
-                      {log.print_job_name || `Job #${log.print_job_id ?? log.id}`}
-                    </span>
-                    <span className="text-xs text-slate-400 tabular-nums">
-                      {new Date(log.logged_at).toLocaleDateString('en-US', {
-                        month: 'short',
-                        day: 'numeric',
-                      })}
-                    </span>
-                  </div>
-                  <div className="flex items-center justify-between text-sm">
-                    <span className="text-slate-400">
-                      Extruded:{' '}
-                      <span className="text-slate-300 tabular-nums">
-                        {log.mm_extruded.toLocaleString()} mm
-                      </span>
-                    </span>
-                    <span className="text-slate-400">
-                      Used:{' '}
-                      <span className="text-slate-300 tabular-nums">
-                        {log.grams_used.toFixed(2)} g
-                      </span>
-                    </span>
-                    <span className="text-slate-400">
-                      {log.cost_usd != null ? (
-                        <>
-                          Cost:{' '}
-                          <span className="text-slate-300 tabular-nums">
-                            ${log.cost_usd.toFixed(3)}
-                          </span>
-                        </>
-                      ) : (
-                        '—'
-                      )}
-                    </span>
-                  </div>
-                </div>
-              ))}
-            </div>
-          </>
-        )}
-      </div>
-
-      {/* ── Delete Confirmation Modal ── */}
-      {deleteConfirm && (
-        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm p-4">
-          <div className="w-full max-w-sm rounded-xl bg-slate-800 border border-slate-700 p-6 shadow-2xl space-y-4">
-            <div className="flex items-center gap-3">
-              <div className="flex h-10 w-10 items-center justify-center rounded-full bg-red-900/30 flex-shrink-0">
-                <AlertTriangle size={20} className="text-red-400" />
-              </div>
-              <div>
-                <h3 className="text-lg font-semibold text-slate-100">
-                  Delete &ldquo;{spool.name}&rdquo;?
-                </h3>
-                <p className="text-sm text-slate-400">
-                  This permanently removes the spool and all usage history. This cannot be undone.
-                </p>
-              </div>
-            </div>
-            <div className="flex justify-end gap-3">
-              <button
-                onClick={() => setDeleteConfirm(false)}
-                disabled={deleting}
-                className="rounded-lg bg-slate-700 px-4 py-2 text-sm font-medium text-slate-200 hover:bg-slate-600 transition-colors disabled:opacity-50"
-              >
-                Cancel
-              </button>
-              <button
-                onClick={handleDelete}
-                disabled={deleting}
-                className="inline-flex items-center gap-2 rounded-lg bg-red-600 px-4 py-2 text-sm font-medium text-white hover:bg-red-500 transition-colors disabled:opacity-50"
-              >
-                {deleting && <Loader2 size={16} className="animate-spin" />}
-                {deleting ? 'Deleting…' : 'Delete'}
-              </button>
-            </div>
-          </div>
-        </div>
-      )}
-    </div>
-  )
-}
-
-/** Small detail row for the info card grid */
-function DetailItem({ label, value }: { label: string; value: React.ReactNode }) {
-  return (
-    <div>
-      <dt className="text-xs font-medium uppercase tracking-wider text-slate-500 mb-0.5">
-        {label}
-      </dt>
-      <dd className="text-sm text-slate-200">{value}</dd>
-    </div>
-  )
-}

frontend/src/pages/InventoryPage.tsx

@@ -35,7 +35,7 @@ export default function InventoryPage() {
     queryFn: () => fetchFilaments(filter),
   })
 
-  const filaments = useMemo(() => data?.data ?? [], [data?.data])
+  const filaments = data?.data ?? []
   const total = data?.total ?? 0
   const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE))
 

frontend/src/pages/PrintJobsPage.tsx

@@ -0,0 +1,283 @@
+import { useState, useMemo } from 'react'
+import { useQuery } from '@tanstack/react-query'
+import { Search, Filter, ChevronLeft, ChevronRight, Loader2 } from 'lucide-react'
+import { fetchPrintJobs } from '../services/printJobService'
+import type { PrintJob, PrintJobFilter, PrintJobStatus } from '../types/printJob'
+
+const PAGE_SIZE = 20
+
+type SortField = 'name' | 'started_at' | 'duration_seconds' | 'filament_grams_used' | 'cost_usd'
+type SortDir = 'asc' | 'desc'
+
+// ── Status helpers ────────────────────────────────────────────────────────────
+
+const STATUS_CONFIG: Record<PrintJobStatus, { label: string; badge: string; icon: string }> = {
+  pending:   { label: 'Pending',   badge: 'bg-slate-700 text-slate-300 border-slate-600',       icon: '⏳' },
+  printing:  { label: 'Printing',  badge: 'bg-blue-900/40 text-blue-300 border-blue-700',       icon: '🖨️' },
+  completed: { label: 'Completed', badge: 'bg-emerald-900/30 text-emerald-300 border-emerald-700', icon: '✅' },
+  failed:    { label: 'Failed',    badge: 'bg-red-900/40 text-red-300 border-red-700',          icon: '❌' },
+}
+
+function StatusBadge({ status }: { status: PrintJobStatus }) {
+  const cfg = STATUS_CONFIG[status] ?? STATUS_CONFIG.pending
+  return (
+    <span className={`inline-flex items-center gap-1 rounded-full border px-2 py-0.5 text-xs font-medium ${cfg.badge}`}>
+      <span className="text-xs">{cfg.icon}</span> {cfg.label}
+    </span>
+  )
+}
+
+// ── Duration formatter ────────────────────────────────────────────────────────
+
+function formatDuration(totalSeconds?: number): string {
+  if (totalSeconds == null || totalSeconds <= 0) return '—'
+  const h = Math.floor(totalSeconds / 3600)
+  const m = Math.floor((totalSeconds % 3600) / 60)
+  const s = totalSeconds % 60
+  if (h > 0) return `${h}h ${m}m`
+  if (m > 0) return `${m}m ${s}s`
+  return `${s}s`
+}
+
+function formatDateTime(iso: string): string {
+  const d = new Date(iso)
+  return d.toLocaleString(undefined, {
+    month: 'short', day: 'numeric',
+    hour: 'numeric', minute: '2-digit',
+  })
+}
+
+// ── Component ─────────────────────────────────────────────────────────────────
+
+export default function PrintJobsPage() {
+  const [search, setSearch] = useState('')
+  const [statusFilter, setStatusFilter] = useState<PrintJobStatus | ''>('')
+  const [printerFilter, setPrinterFilter] = useState('')
+  const [sortBy, setSortBy] = useState<SortField>('started_at')
+  const [sortDir, setSortDir] = useState<SortDir>('desc')
+  const [page, setPage] = useState(0)
+
+  const filter: PrintJobFilter = useMemo(() => ({
+    status: statusFilter || undefined,
+    printer: printerFilter || undefined,
+    sort_by: sortBy,
+    sort_dir: sortDir,
+    limit: PAGE_SIZE,
+    offset: page * PAGE_SIZE,
+  }), [statusFilter, printerFilter, sortBy, sortDir, page])
+
+  const { data, isLoading, error, refetch } = useQuery({
+    queryKey: ['printJobs', filter],
+    queryFn: () => fetchPrintJobs(filter),
+  })
+
+  const total = data?.total ?? 0
+  const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE))
+
+  // Client-side search (name + printer name)
+  const filtered = useMemo(() => {
+    const jobList = data?.data ?? []
+    if (!search.trim()) return jobList
+    const q = search.toLowerCase()
+    return jobList.filter(
+      (j: PrintJob) =>
+        j.name.toLowerCase().includes(q) ||
+        j.printer_name.toLowerCase().includes(q)
+    )
+  }, [data?.data, search])
+
+  const handleSort = (field: SortField) => {
+    if (sortBy === field) {
+      setSortDir(prev => (prev === 'asc' ? 'desc' : 'asc'))
+    } else {
+      setSortBy(field)
+      setSortDir('asc')
+    }
+    setPage(0)
+  }
+
+  const SortIndicator = ({ field }: { field: SortField }) => {
+    if (sortBy !== field) return <span className="text-slate-600 ml-1">↕</span>
+    return <span className="text-emerald-400 ml-1">{sortDir === 'asc' ? '↑' : '↓'}</span>
+  }
+
+  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">Print Jobs</h2>
+          <p className="text-sm text-slate-400">{total} job(s) total</p>
+        </div>
+      </div>
+
+      {/* Filters */}
+      <div className="flex flex-col lg:flex-row gap-3">
+        {/* Search */}
+        <div className="relative flex-1">
+          <Search size={16} className="absolute left-3 top-1/2 -translate-y-1/2 text-slate-400" />
+          <input
+            type="text"
+            placeholder="Search by job or printer name…"
+            value={search}
+            onChange={e => { setSearch(e.target.value); setPage(0) }}
+            className="w-full rounded-lg bg-slate-800 border border-slate-700 pl-9 pr-3 py-2 text-sm text-slate-100 placeholder-slate-500 focus:outline-none focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500"
+          />
+        </div>
+
+        {/* Status filter */}
+        <select
+          value={statusFilter}
+          onChange={e => { setStatusFilter(e.target.value as PrintJobStatus | ''); setPage(0) }}
+          className="rounded-lg bg-slate-800 border border-slate-700 px-3 py-2 text-sm text-slate-100 focus:outline-none focus:ring-2 focus:ring-emerald-500"
+        >
+          <option value="">All Statuses</option>
+          <option value="pending">Pending</option>
+          <option value="printing">Printing</option>
+          <option value="completed">Completed</option>
+          <option value="failed">Failed</option>
+        </select>
+
+        {/* Printer filter */}
+        <input
+          type="text"
+          placeholder="Filter by printer…"
+          value={printerFilter}
+          onChange={e => { setPrinterFilter(e.target.value); setPage(0) }}
+          className="rounded-lg bg-slate-800 border border-slate-700 px-3 py-2 text-sm text-slate-100 placeholder-slate-500 focus:outline-none focus:ring-2 focus:ring-emerald-500 focus:border-emerald-500 min-w-[160px]"
+        />
+
+        {/* Filter indicator */}
+        {(statusFilter || printerFilter) && (
+          <span className="inline-flex items-center gap-1 rounded-lg bg-emerald-900/30 border border-emerald-700 px-3 py-2 text-xs text-emerald-300">
+            <Filter size={14} />
+            {[statusFilter && `Status: ${statusFilter}`, printerFilter && `Printer: ${printerFilter}`].filter(Boolean).join(' · ')}
+          </span>
+        )}
+      </div>
+
+      {/* Loading / Error */}
+      {isLoading && (
+        <div className="flex items-center justify-center py-12 gap-2 text-slate-400">
+          <Loader2 size={18} className="animate-spin" /> Loading print jobs…
+        </div>
+      )}
+      {error && (
+        <div className="text-center py-12 text-red-400">
+          Failed to load print jobs.
+          <button onClick={() => refetch()} className="ml-2 underline hover:text-red-300">Retry</button>
+        </div>
+      )}
+
+      {/* Desktop Table */}
+      {!isLoading && !error && (
+        <>
+          <div className="hidden md: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 cursor-pointer select-none hover:text-slate-100" onClick={() => handleSort('name')}>
+                    Job <SortIndicator field="name" />
+                  </th>
+                  <th className="px-4 py-3 text-left font-semibold">Printer</th>
+                  <th className="px-4 py-3 text-left font-semibold">Status</th>
+                  <th className="px-4 py-3 text-left font-semibold cursor-pointer select-none hover:text-slate-100" onClick={() => handleSort('started_at')}>
+                    Started <SortIndicator field="started_at" />
+                  </th>
+                  <th className="px-4 py-3 text-right font-semibold cursor-pointer select-none hover:text-slate-100" onClick={() => handleSort('duration_seconds')}>
+                    Duration <SortIndicator field="duration_seconds" />
+                  </th>
+                  <th className="px-4 py-3 text-right font-semibold cursor-pointer select-none hover:text-slate-100" onClick={() => handleSort('filament_grams_used')}>
+                    Filament <SortIndicator field="filament_grams_used" />
+                  </th>
+                  <th className="px-4 py-3 text-right font-semibold cursor-pointer select-none hover:text-slate-100" onClick={() => handleSort('cost_usd')}>
+                    Cost <SortIndicator field="cost_usd" />
+                  </th>
+                </tr>
+              </thead>
+              <tbody className="divide-y divide-slate-700">
+                {filtered.length === 0 && (
+                  <tr>
+                    <td colSpan={7} className="px-4 py-8 text-center text-slate-500">No print jobs found.</td>
+                  </tr>
+                )}
+                {filtered.map((job: PrintJob) => (
+                  <tr key={job.id} className="bg-slate-800/50 hover:bg-slate-700/50 transition-colors">
+                    <td className="px-4 py-3 font-medium text-slate-100">{job.name}</td>
+                    <td className="px-4 py-3 text-slate-300">{job.printer_name}</td>
+                    <td className="px-4 py-3"><StatusBadge status={job.status} /></td>
+                    <td className="px-4 py-3 text-slate-300">{formatDateTime(job.started_at)}</td>
+                    <td className="px-4 py-3 text-right tabular-nums text-slate-300">{formatDuration(job.duration_seconds)}</td>
+                    <td className="px-4 py-3 text-right tabular-nums text-slate-300">{job.filament_grams_used != null ? `${job.filament_grams_used.toLocaleString()} g` : '—'}</td>
+                    <td className="px-4 py-3 text-right tabular-nums text-slate-300">{job.cost_usd != null ? `$${job.cost_usd.toFixed(2)}` : '—'}</td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+
+          {/* Mobile Cards */}
+          <div className="md:hidden space-y-3">
+            {filtered.length === 0 && (
+              <div className="text-center py-12 text-slate-500">No print jobs found.</div>
+            )}
+            {filtered.map((job: PrintJob) => (
+              <div key={job.id} className="rounded-lg border border-slate-700 bg-slate-800 p-4 space-y-3">
+                <div className="flex items-start justify-between">
+                  <div>
+                    <div className="font-semibold text-slate-100">{job.name}</div>
+                    <div className="text-xs text-slate-400 mt-0.5">{job.printer_name}</div>
+                  </div>
+                  <StatusBadge status={job.status} />
+                </div>
+
+                <div className="grid grid-cols-2 gap-2 text-sm">
+                  <div>
+                    <span className="text-slate-500 text-xs">Started</span>
+                    <div className="text-slate-300">{formatDateTime(job.started_at)}</div>
+                  </div>
+                  <div>
+                    <span className="text-slate-500 text-xs">Duration</span>
+                    <div className="text-slate-300 tabular-nums">{formatDuration(job.duration_seconds)}</div>
+                  </div>
+                  <div>
+                    <span className="text-slate-500 text-xs">Filament</span>
+                    <div className="text-slate-300 tabular-nums">{job.filament_grams_used != null ? `${job.filament_grams_used.toLocaleString()} g` : '—'}</div>
+                  </div>
+                  <div>
+                    <span className="text-slate-500 text-xs">Cost</span>
+                    <div className="text-slate-300 tabular-nums">{job.cost_usd != null ? `$${job.cost_usd.toFixed(2)}` : '—'}</div>
+                  </div>
+                </div>
+              </div>
+            ))}
+          </div>
+
+          {/* Pagination */}
+          <div className="flex items-center justify-between pt-2">
+            <span className="text-sm text-slate-400">
+              Showing {total === 0 ? 0 : page * PAGE_SIZE + 1}–{Math.min((page + 1) * PAGE_SIZE, total)} of {total}
+            </span>
+            <div className="flex items-center gap-2">
+              <button
+                onClick={() => setPage(p => Math.max(0, p - 1))}
+                disabled={page === 0}
+                className="p-2 rounded-lg bg-slate-800 border border-slate-700 text-slate-300 hover:bg-slate-700 disabled:opacity-40 disabled:cursor-not-allowed transition-colors"
+              >
+                <ChevronLeft size={16} />
+              </button>
+              <span className="text-sm text-slate-300 tabular-nums">{page + 1} / {totalPages}</span>
+              <button
+                onClick={() => setPage(p => Math.min(totalPages - 1, p + 1))}
+                disabled={page >= totalPages - 1}
+                className="p-2 rounded-lg bg-slate-800 border border-slate-700 text-slate-300 hover:bg-slate-700 disabled:opacity-40 disabled:cursor-not-allowed transition-colors"
+              >
+                <ChevronRight size={16} />
+              </button>
+            </div>
+          </div>
+        </>
+      )}
+    </div>
+  )
+}

frontend/src/services/filamentService.ts

@@ -1,5 +1,5 @@
 import axios from 'axios'
-import type { FilamentSpool, ListResponse, UsageLog, FilamentFilter } from '../types/filament'
+import type { FilamentSpool, ListResponse, FilamentFilter } from '../types/filament'
 
 const API_BASE = '/api'
 
@@ -19,16 +19,6 @@ export async function fetchFilaments(filter: FilamentFilter): Promise<ListRespon
   return res.data
 }
 
-export async function fetchFilamentById(id: number): Promise<FilamentSpool> {
-  const res = await axios.get<FilamentSpool>(`${API_BASE}/filaments/${id}`)
-  return res.data
-}
-
-export async function fetchUsageLogs(spoolId: number): Promise<UsageLog[]> {
-  const res = await axios.get<UsageLog[]>(`${API_BASE}/usage-logs?spool_id=${spoolId}`)
-  return res.data
-}
-
 export async function deleteFilament(id: number): Promise<void> {
   await axios.delete(`${API_BASE}/filaments/${id}`)
 }

frontend/src/services/printJobService.ts

@@ -0,0 +1,17 @@
+import axios from 'axios'
+import type { PrintJob, ListResponse, PrintJobFilter } from '../types/printJob'
+
+const API_BASE = '/api'
+
+export async function fetchPrintJobs(filter: PrintJobFilter): Promise<ListResponse<PrintJob>> {
+  const params = new URLSearchParams()
+  if (filter.status) params.set('status', filter.status)
+  if (filter.printer) params.set('printer', filter.printer)
+  if (filter.sort_by) params.set('sort_by', filter.sort_by)
+  if (filter.sort_dir) params.set('sort_dir', filter.sort_dir)
+  if (filter.limit !== undefined) params.set('limit', String(filter.limit))
+  if (filter.offset !== undefined) params.set('offset', String(filter.offset))
+
+  const res = await axios.get<ListResponse<PrintJob>>(`${API_BASE}/print-jobs?${params.toString()}`)
+  return res.data
+}

frontend/src/types/filament.ts

@@ -59,19 +59,6 @@ export interface ListResponse<T> {
   offset: number
 }
 
-export interface UsageLog {
-  id: number
-  spool_id: number
-  print_job_id?: number
-  print_job_name?: string
-  mm_extruded: number
-  grams_used: number
-  cost_usd?: number
-  logged_at: string
-  notes?: string
-  created_at: string
-}
-
 export interface FilamentFilter {
   material?: string
   finish?: string

frontend/src/types/printJob.ts

@@ -0,0 +1,32 @@
+// Print Job domain types
+
+export type PrintJobStatus = 'pending' | 'printing' | 'completed' | 'failed'
+
+export interface PrintJob {
+  id: number
+  name: string
+  printer_name: string
+  status: PrintJobStatus
+  started_at: string
+  duration_seconds?: number
+  filament_grams_used?: number
+  cost_usd?: number
+  created_at: string
+  updated_at: string
+}
+
+export interface ListResponse<T> {
+  data: T[]
+  total: number
+  limit: number
+  offset: number
+}
+
+export interface PrintJobFilter {
+  status?: PrintJobStatus
+  printer?: string
+  sort_by?: string
+  sort_dir?: 'asc' | 'desc'
+  limit?: number
+  offset?: number
+}