Add log usage buttons on main page and seperate page

src/app/(app)/dashboard/_components/recent-usage-card.tsx

@@ -0,0 +1,82 @@
+"use client";
+
+import { useState } from "react";
+import { Plus } from "lucide-react";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Button } from "@/components/ui/button";
+import { QuickUsageDialog } from "@/components/shared/quick-usage-dialog";
+import type { PickerItem } from "@/data/usage.queries";
+
+interface RecentUsage {
+  id: string;
+  itemType: string;
+  amount: number;
+  unit: string;
+  notes: string | null;
+  createdAt: string;
+  itemName: string;
+}
+
+interface RecentUsageCardProps {
+  recentUsage: RecentUsage[];
+  items: PickerItem[];
+}
+
+export function RecentUsageCard({ recentUsage, items }: RecentUsageCardProps) {
+  const [dialogOpen, setDialogOpen] = useState(false);
+
+  return (
+    <>
+      <Card className="border-border">
+        <CardHeader className="pb-3">
+          <div className="flex items-center justify-between">
+            <div>
+              <CardTitle className="text-base">Recent Usage</CardTitle>
+              <CardDescription>Latest consumption log entries</CardDescription>
+            </div>
+            <Button size="sm" onClick={() => setDialogOpen(true)}>
+              <Plus className="mr-1.5 h-3.5 w-3.5" />
+              Log Usage
+            </Button>
+          </div>
+        </CardHeader>
+        <CardContent>
+          {recentUsage.length === 0 ? (
+            <p className="text-sm text-muted-foreground">No usage logged yet.</p>
+          ) : (
+            <div className="space-y-3">
+              {recentUsage.map((log) => (
+                <div key={log.id} className="flex items-center gap-3">
+                  <Badge variant="outline" className="text-[10px] shrink-0">
+                    {log.itemType}
+                  </Badge>
+                  <div className="flex-1 min-w-0">
+                    <p className="text-sm font-medium truncate">{log.itemName}</p>
+                    <p className="text-xs text-muted-foreground">
+                      {log.notes || "No notes"}
+                    </p>
+                  </div>
+                  <div className="text-right shrink-0">
+                    <p className="text-sm font-medium">
+                      -{log.amount}{log.unit}
+                    </p>
+                    <p className="text-xs text-muted-foreground">
+                      {new Date(log.createdAt).toLocaleDateString()}
+                    </p>
+                  </div>
+                </div>
+              ))}
+            </div>
+          )}
+        </CardContent>
+      </Card>
+
+      <QuickUsageDialog
+        open={dialogOpen}
+        onOpenChange={setDialogOpen}
+        items={items}
+      />
+    </>
+  );
+}

src/app/(app)/dashboard/page.tsx

@@ -1,25 +1,35 @@
 import { auth } from "@/lib/auth";
 import { redirect } from "next/navigation";
 import { getDashboardStats } from "@/data/dashboard.queries";
+import { getAllUserItems } from "@/data/usage.queries";
 import { getUserSettings } from "@/data/settings.queries";
-import { Package, DollarSign, AlertTriangle, Activity } from "lucide-react";
+import { Package, Euro, AlertTriangle, Activity } from "lucide-react";
 import { StatCard } from "@/components/shared/stat-card";
 import { ColorSwatch } from "@/components/shared/color-swatch";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
-import { Badge } from "@/components/ui/badge";
+import { RecentUsageCard } from "./_components/recent-usage-card";
 
 export default async function DashboardPage() {
   const session = await auth();
   if (!session?.user?.id) redirect("/login");
 
   const settings = await getUserSettings(session.user.id);
-  const stats = await getDashboardStats(session.user.id, settings.lowStockThreshold);
+  const [stats, items] = await Promise.all([
+    getDashboardStats(session.user.id, settings.lowStockThreshold),
+    getAllUserItems(session.user.id),
+  ]);
 
   const currencyFormatter = new Intl.NumberFormat("en-US", {
     style: "currency",
     currency: settings.currency,
   });
 
+  // Serialize dates for the client component
+  const serializedUsage = stats.recentUsage.map((log) => ({
+    ...log,
+    createdAt: log.createdAt.toISOString(),
+  }));
+
   return (
     <div className="space-y-6">
       {/* Stats Grid */}
@@ -33,7 +43,7 @@ export default async function DashboardPage() {
         <StatCard
           title="Inventory Value"
           value={currencyFormatter.format(stats.inventoryValue)}
-          icon={DollarSign}
+          icon={Euro}
           description="Total purchase cost"
         />
         <StatCard
@@ -85,41 +95,7 @@ export default async function DashboardPage() {
         </Card>
 
         {/* Recent Usage */}
-        <Card className="border-border">
-          <CardHeader className="pb-3">
-            <CardTitle className="text-base">Recent Usage</CardTitle>
-            <CardDescription>Latest consumption log entries</CardDescription>
-          </CardHeader>
-          <CardContent>
-            {stats.recentUsage.length === 0 ? (
-              <p className="text-sm text-muted-foreground">No usage logged yet.</p>
-            ) : (
-              <div className="space-y-3">
-                {stats.recentUsage.map((log) => (
-                  <div key={log.id} className="flex items-center gap-3">
-                    <Badge variant="outline" className="text-[10px] shrink-0">
-                      {log.itemType}
-                    </Badge>
-                    <div className="flex-1 min-w-0">
-                      <p className="text-sm font-medium truncate">{log.itemName}</p>
-                      <p className="text-xs text-muted-foreground">
-                        {log.notes || "No notes"}
-                      </p>
-                    </div>
-                    <div className="text-right shrink-0">
-                      <p className="text-sm font-medium">
-                        -{log.amount}{log.unit}
-                      </p>
-                      <p className="text-xs text-muted-foreground">
-                        {new Date(log.createdAt).toLocaleDateString()}
-                      </p>
-                    </div>
-                  </div>
-                ))}
-              </div>
-            )}
-          </CardContent>
-        </Card>
+        <RecentUsageCard recentUsage={serializedUsage} items={items} />
       </div>
     </div>
   );

src/app/(app)/usage/_components/usage-columns.tsx

@@ -0,0 +1,63 @@
+"use client";
+
+import { type ColumnDef } from "@tanstack/react-table";
+import { DataTableColumnHeader } from "@/components/shared/data-table-column-header";
+import { Badge } from "@/components/ui/badge";
+import type { UsageLogRow } from "@/data/usage.queries";
+
+export function getUsageColumns(): ColumnDef<UsageLogRow, unknown>[] {
+  return [
+    {
+      accessorKey: "createdAt",
+      header: ({ column }) => <DataTableColumnHeader column={column} title="Date" />,
+      cell: ({ row }) => {
+        const date = new Date(row.original.createdAt);
+        return (
+          <div className="text-sm">
+            <p>{date.toLocaleDateString()}</p>
+            <p className="text-xs text-muted-foreground">{date.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" })}</p>
+          </div>
+        );
+      },
+      size: 130,
+    },
+    {
+      accessorKey: "itemType",
+      header: ({ column }) => <DataTableColumnHeader column={column} title="Type" />,
+      cell: ({ row }) => (
+        <Badge variant="outline" className="text-[10px]">
+          {row.original.itemType}
+        </Badge>
+      ),
+      size: 100,
+    },
+    {
+      accessorKey: "itemName",
+      header: ({ column }) => <DataTableColumnHeader column={column} title="Item" />,
+      cell: ({ row }) => (
+        <p className="text-sm font-medium truncate max-w-[200px]">{row.original.itemName}</p>
+      ),
+      enableSorting: false,
+    },
+    {
+      accessorKey: "amount",
+      header: ({ column }) => <DataTableColumnHeader column={column} title="Amount" />,
+      cell: ({ row }) => (
+        <span className="text-sm font-medium">
+          -{row.original.amount}{row.original.unit}
+        </span>
+      ),
+      size: 100,
+    },
+    {
+      accessorKey: "notes",
+      header: "Notes",
+      cell: ({ row }) => (
+        <p className="text-sm text-muted-foreground truncate max-w-[250px]">
+          {row.original.notes || "\u2014"}
+        </p>
+      ),
+      enableSorting: false,
+    },
+  ];
+}

src/app/(app)/usage/_components/usage-table.tsx

@@ -0,0 +1,77 @@
+"use client";
+
+import { useState, useCallback } from "react";
+import { useRouter, usePathname, useSearchParams } from "next/navigation";
+import { Plus } from "lucide-react";
+import { useDataTable } from "@/hooks/use-data-table";
+import { getUsageColumns } from "./usage-columns";
+import { DataTable } from "@/components/shared/data-table";
+import { DataTablePagination } from "@/components/shared/data-table-pagination";
+import { DataTableFacetedFilter } from "@/components/shared/data-table-faceted-filter";
+import { QuickUsageDialog } from "@/components/shared/quick-usage-dialog";
+import { PageHeader } from "@/components/shared/page-header";
+import { Button } from "@/components/ui/button";
+import type { UsageLogRow } from "@/data/usage.queries";
+import type { PickerItem } from "@/data/usage.queries";
+
+const ITEM_TYPE_OPTIONS = [
+  { label: "Filament", value: "FILAMENT" },
+  { label: "Resin", value: "RESIN" },
+  { label: "Paint", value: "PAINT" },
+  { label: "Supply", value: "SUPPLY" },
+];
+
+interface UsageTableProps {
+  data: UsageLogRow[];
+  pageCount: number;
+  totalCount: number;
+  items: PickerItem[];
+}
+
+export function UsageTable({ data, pageCount, totalCount, items }: UsageTableProps) {
+  const router = useRouter();
+  const pathname = usePathname();
+  const searchParams = useSearchParams();
+  const [dialogOpen, setDialogOpen] = useState(false);
+
+  const itemTypeFilter = new Set(searchParams.getAll("itemType"));
+
+  const updateFilters = useCallback(
+    (key: string, values: Set<string>) => {
+      const params = new URLSearchParams(searchParams.toString());
+      params.delete(key);
+      values.forEach((v) => params.append(key, v));
+      params.set("page", "1");
+      router.push(`${pathname}?${params.toString()}`, { scroll: false });
+    },
+    [router, pathname, searchParams]
+  );
+
+  const columns = getUsageColumns();
+  const { table } = useDataTable({ data, columns, pageCount });
+
+  return (
+    <div className="space-y-4">
+      <PageHeader title="Usage History" description="Track material consumption across all items">
+        <Button onClick={() => setDialogOpen(true)}>
+          <Plus className="mr-2 h-4 w-4" />
+          Log Usage
+        </Button>
+      </PageHeader>
+
+      <div className="flex flex-wrap items-center gap-2">
+        <DataTableFacetedFilter
+          title="Item Type"
+          options={ITEM_TYPE_OPTIONS}
+          selectedValues={itemTypeFilter}
+          onSelectionChange={(values) => updateFilters("itemType", values)}
+        />
+      </div>
+
+      <DataTable table={table} emptyMessage="No usage logged yet. Start tracking your consumption!" />
+      <DataTablePagination table={table} totalCount={totalCount} />
+
+      <QuickUsageDialog open={dialogOpen} onOpenChange={setDialogOpen} items={items} />
+    </div>
+  );
+}

src/app/(app)/usage/actions.ts

@@ -0,0 +1,160 @@
+"use server";
+
+import { auth } from "@/lib/auth";
+import { prisma } from "@/lib/prisma";
+import { revalidatePath } from "next/cache";
+import { z } from "zod/v4";
+import type { ActionResult } from "@/types/api.types";
+
+const batchEntrySchema = z.object({
+  itemType: z.enum(["FILAMENT", "RESIN", "PAINT", "SUPPLY"]),
+  itemId: z.string().min(1),
+  amount: z.coerce.number().positive("Amount must be positive"),
+  notes: z.string().max(512).optional(),
+});
+
+const batchUsageSchema = z.object({
+  entries: z.array(batchEntrySchema).min(1, "At least one entry is required"),
+});
+
+export async function logBatchUsage(input: unknown): Promise<ActionResult> {
+  const session = await auth();
+  if (!session?.user?.id) return { success: false, error: "Unauthorized" };
+
+  const parsed = batchUsageSchema.safeParse(input);
+  if (!parsed.success) {
+    return { success: false, error: "Validation failed" };
+  }
+
+  const { entries } = parsed.data;
+  const userId = session.user.id;
+
+  try {
+    // Verify ownership of all items and build transaction operations
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const operations: any[] = [];
+    const affectedPaths = new Set<string>();
+
+    for (const entry of entries) {
+      switch (entry.itemType) {
+        case "FILAMENT": {
+          const item = await prisma.filament.findFirst({
+            where: { id: entry.itemId, userId },
+          });
+          if (!item) return { success: false, error: `Filament not found` };
+
+          operations.push(
+            prisma.usageLog.create({
+              data: {
+                itemType: "FILAMENT",
+                itemId: entry.itemId,
+                filamentId: entry.itemId,
+                amount: entry.amount,
+                unit: "g",
+                notes: entry.notes || null,
+                userId,
+              },
+            }),
+            prisma.filament.update({
+              where: { id: entry.itemId },
+              data: { usedWeight: { increment: entry.amount } },
+            })
+          );
+          affectedPaths.add("/filaments");
+          break;
+        }
+        case "RESIN": {
+          const item = await prisma.resin.findFirst({
+            where: { id: entry.itemId, userId },
+          });
+          if (!item) return { success: false, error: `Resin not found` };
+
+          operations.push(
+            prisma.usageLog.create({
+              data: {
+                itemType: "RESIN",
+                itemId: entry.itemId,
+                resinId: entry.itemId,
+                amount: entry.amount,
+                unit: "ml",
+                notes: entry.notes || null,
+                userId,
+              },
+            }),
+            prisma.resin.update({
+              where: { id: entry.itemId },
+              data: { usedML: { increment: entry.amount } },
+            })
+          );
+          affectedPaths.add("/resins");
+          break;
+        }
+        case "PAINT": {
+          const item = await prisma.paint.findFirst({
+            where: { id: entry.itemId, userId },
+          });
+          if (!item) return { success: false, error: `Paint not found` };
+
+          operations.push(
+            prisma.usageLog.create({
+              data: {
+                itemType: "PAINT",
+                itemId: entry.itemId,
+                paintId: entry.itemId,
+                amount: entry.amount,
+                unit: "ml",
+                notes: entry.notes || null,
+                userId,
+              },
+            }),
+            prisma.paint.update({
+              where: { id: entry.itemId },
+              data: { usedML: { increment: entry.amount } },
+            })
+          );
+          affectedPaths.add("/paints");
+          break;
+        }
+        case "SUPPLY": {
+          const item = await prisma.supply.findFirst({
+            where: { id: entry.itemId, userId },
+          });
+          if (!item) return { success: false, error: `Supply not found` };
+
+          operations.push(
+            prisma.usageLog.create({
+              data: {
+                itemType: "SUPPLY",
+                itemId: entry.itemId,
+                supplyId: entry.itemId,
+                amount: entry.amount,
+                unit: item.unit,
+                notes: entry.notes || null,
+                userId,
+              },
+            }),
+            prisma.supply.update({
+              where: { id: entry.itemId },
+              data: { usedAmount: { increment: entry.amount } },
+            })
+          );
+          affectedPaths.add("/supplies");
+          break;
+        }
+      }
+    }
+
+    await prisma.$transaction(operations);
+
+    // Revalidate all affected pages
+    revalidatePath("/dashboard");
+    revalidatePath("/usage");
+    for (const path of affectedPaths) {
+      revalidatePath(path);
+    }
+
+    return { success: true, data: undefined };
+  } catch {
+    return { success: false, error: "Failed to log usage" };
+  }
+}

src/app/(app)/usage/page.tsx

@@ -0,0 +1,29 @@
+import { auth } from "@/lib/auth";
+import { redirect } from "next/navigation";
+import { getUsageLogs, getAllUserItems } from "@/data/usage.queries";
+import type { DataTableSearchParams } from "@/types/table.types";
+import { UsageTable } from "./_components/usage-table";
+
+interface Props {
+  searchParams: Promise<DataTableSearchParams>;
+}
+
+export default async function UsagePage({ searchParams }: Props) {
+  const session = await auth();
+  if (!session?.user?.id) redirect("/login");
+
+  const params = await searchParams;
+  const [result, items] = await Promise.all([
+    getUsageLogs(session.user.id, params),
+    getAllUserItems(session.user.id),
+  ]);
+
+  return (
+    <UsageTable
+      data={JSON.parse(JSON.stringify(result.data))}
+      pageCount={result.pageCount}
+      totalCount={result.totalCount}
+      items={items}
+    />
+  );
+}

src/components/layout/mobile-sidebar.tsx

@@ -7,6 +7,8 @@ import {
   Cylinder,
   Droplets,
   Paintbrush,
+  Gem,
+  ClipboardList,
   Building2,
   MapPin,
   Settings,
@@ -16,13 +18,15 @@ import { cn } from "@/lib/utils";
 import { APP_NAME } from "@/lib/constants";
 import { SheetHeader, SheetTitle } from "@/components/ui/sheet";
 
-const icons = { LayoutDashboard, Cylinder, Droplets, Paintbrush, Building2, MapPin, Settings };
+const icons = { LayoutDashboard, Cylinder, Droplets, Paintbrush, Gem, ClipboardList, Building2, MapPin, Settings };
 
 const navItems = [
   { label: "Dashboard", href: "/dashboard", icon: "LayoutDashboard" as const },
   { label: "Filaments", href: "/filaments", icon: "Cylinder" as const },
   { label: "Resins", href: "/resins", icon: "Droplets" as const },
   { label: "Paints", href: "/paints", icon: "Paintbrush" as const },
+  { label: "Supplies", href: "/supplies", icon: "Gem" as const },
+  { label: "Usage", href: "/usage", icon: "ClipboardList" as const },
   { label: "Vendors", href: "/vendors", icon: "Building2" as const },
   { label: "Locations", href: "/locations", icon: "MapPin" as const },
   { label: "Settings", href: "/settings", icon: "Settings" as const },

src/components/layout/sidebar.tsx

@@ -9,6 +9,7 @@ import {
   Droplets,
   Paintbrush,
   Gem,
+  ClipboardList,
   Building2,
   MapPin,
   Settings,
@@ -27,6 +28,7 @@ const icons = {
   Droplets,
   Paintbrush,
   Gem,
+  ClipboardList,
   Building2,
   MapPin,
   Settings,
@@ -38,6 +40,7 @@ const navItems = [
   { label: "Resins", href: "/resins", icon: "Droplets" as const },
   { label: "Paints", href: "/paints", icon: "Paintbrush" as const },
   { label: "Supplies", href: "/supplies", icon: "Gem" as const },
+  { label: "Usage", href: "/usage", icon: "ClipboardList" as const },
   { label: "Vendors", href: "/vendors", icon: "Building2" as const },
   { label: "Locations", href: "/locations", icon: "MapPin" as const },
   { label: "Settings", href: "/settings", icon: "Settings" as const },

src/components/shared/quick-usage-dialog.tsx

@@ -0,0 +1,298 @@
+"use client";
+
+import { useState, useTransition } from "react";
+import { Plus, Trash2 } from "lucide-react";
+import { toast } from "sonner";
+import { logBatchUsage } from "@/app/(app)/usage/actions";
+import type { PickerItem } from "@/data/usage.queries";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { Input } from "@/components/ui/input";
+import { Button } from "@/components/ui/button";
+import { Label } from "@/components/ui/label";
+import { Textarea } from "@/components/ui/textarea";
+
+const ITEM_TYPES = ["FILAMENT", "RESIN", "PAINT", "SUPPLY"] as const;
+type ItemType = (typeof ITEM_TYPES)[number];
+
+interface UsageRow {
+  id: string;
+  itemType: ItemType | "";
+  itemId: string;
+  amount: string;
+  notes: string;
+}
+
+function createEmptyRow(): UsageRow {
+  return {
+    id: crypto.randomUUID(),
+    itemType: "",
+    itemId: "",
+    amount: "",
+    notes: "",
+  };
+}
+
+interface QuickUsageDialogProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  items: PickerItem[];
+}
+
+export function QuickUsageDialog({ open, onOpenChange, items }: QuickUsageDialogProps) {
+  const [rows, setRows] = useState<UsageRow[]>([createEmptyRow()]);
+  const [isPending, startTransition] = useTransition();
+
+  function updateRow(id: string, updates: Partial<UsageRow>) {
+    setRows((prev) =>
+      prev.map((row) => {
+        if (row.id !== id) return row;
+        const updated = { ...row, ...updates };
+        // Reset itemId when type changes
+        if (updates.itemType !== undefined && updates.itemType !== row.itemType) {
+          updated.itemId = "";
+        }
+        return updated;
+      })
+    );
+  }
+
+  function removeRow(id: string) {
+    setRows((prev) => {
+      if (prev.length <= 1) return prev;
+      return prev.filter((row) => row.id !== id);
+    });
+  }
+
+  function addRow() {
+    setRows((prev) => [...prev, createEmptyRow()]);
+  }
+
+  function resetAndClose() {
+    setRows([createEmptyRow()]);
+    onOpenChange(false);
+  }
+
+  function getItemsForType(type: ItemType | "") {
+    if (!type) return [];
+    return items.filter((item) => item.type === type);
+  }
+
+  function getUnit(row: UsageRow): string {
+    if (!row.itemId) {
+      if (row.itemType === "FILAMENT") return "g";
+      if (row.itemType === "RESIN" || row.itemType === "PAINT") return "ml";
+      return "";
+    }
+    const item = items.find((i) => i.id === row.itemId);
+    return item?.unit ?? "";
+  }
+
+  function isValid(): boolean {
+    return rows.every(
+      (row) =>
+        row.itemType !== "" &&
+        row.itemId !== "" &&
+        row.amount !== "" &&
+        Number(row.amount) > 0
+    );
+  }
+
+  function handleSubmit() {
+    if (!isValid()) return;
+
+    startTransition(async () => {
+      const entries = rows.map((row) => ({
+        itemType: row.itemType as ItemType,
+        itemId: row.itemId,
+        amount: Number(row.amount),
+        notes: row.notes || undefined,
+      }));
+
+      const result = await logBatchUsage({ entries });
+
+      if (!result.success) {
+        toast.error(result.error || "Failed to log usage");
+        return;
+      }
+
+      toast.success(
+        entries.length === 1 ? "Usage logged successfully" : `${entries.length} usage entries logged`
+      );
+      resetAndClose();
+    });
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={(o) => (o ? onOpenChange(true) : resetAndClose())}>
+      <DialogContent className="sm:max-w-2xl max-h-[85vh] overflow-y-auto">
+        <DialogHeader>
+          <DialogTitle>Log Usage</DialogTitle>
+          <DialogDescription>
+            Record material consumption for one or more items.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="space-y-4">
+          {rows.map((row, index) => {
+            const availableItems = getItemsForType(row.itemType);
+            const unit = getUnit(row);
+
+            return (
+              <div key={row.id} className="space-y-3 rounded-lg border border-border p-3">
+                <div className="flex items-center justify-between">
+                  <span className="text-xs font-medium text-muted-foreground">
+                    Item {index + 1}
+                  </span>
+                  {rows.length > 1 && (
+                    <Button
+                      type="button"
+                      variant="ghost"
+                      size="icon"
+                      className="h-6 w-6"
+                      onClick={() => removeRow(row.id)}
+                    >
+                      <Trash2 className="h-3.5 w-3.5 text-muted-foreground" />
+                    </Button>
+                  )}
+                </div>
+
+                <div className="grid grid-cols-2 gap-3">
+                  {/* Item Type */}
+                  <div className="space-y-1.5">
+                    <Label className="text-xs">Type</Label>
+                    <Select
+                      value={row.itemType}
+                      onValueChange={(value) =>
+                        updateRow(row.id, { itemType: value as ItemType })
+                      }
+                    >
+                      <SelectTrigger className="h-9">
+                        <SelectValue placeholder="Select type" />
+                      </SelectTrigger>
+                      <SelectContent>
+                        {ITEM_TYPES.map((type) => (
+                          <SelectItem key={type} value={type}>
+                            {type.charAt(0) + type.slice(1).toLowerCase()}
+                          </SelectItem>
+                        ))}
+                      </SelectContent>
+                    </Select>
+                  </div>
+
+                  {/* Item */}
+                  <div className="space-y-1.5">
+                    <Label className="text-xs">Item</Label>
+                    <Select
+                      value={row.itemId}
+                      onValueChange={(value) => updateRow(row.id, { itemId: value })}
+                      disabled={!row.itemType}
+                    >
+                      <SelectTrigger className="h-9">
+                        <SelectValue
+                          placeholder={
+                            row.itemType ? "Select item" : "Select type first"
+                          }
+                        />
+                      </SelectTrigger>
+                      <SelectContent>
+                        {availableItems.length === 0 ? (
+                          <SelectItem value="__empty" disabled>
+                            No items available
+                          </SelectItem>
+                        ) : (
+                          availableItems.map((item) => (
+                            <SelectItem key={item.id} value={item.id}>
+                              {item.name}
+                            </SelectItem>
+                          ))
+                        )}
+                      </SelectContent>
+                    </Select>
+                  </div>
+                </div>
+
+                <div className="grid grid-cols-2 gap-3">
+                  {/* Amount */}
+                  <div className="space-y-1.5">
+                    <Label className="text-xs">
+                      Amount{unit ? ` (${unit})` : ""}
+                    </Label>
+                    <Input
+                      type="number"
+                      step="0.1"
+                      min="0"
+                      placeholder={unit ? `Amount in ${unit}` : "Amount"}
+                      value={row.amount}
+                      onChange={(e) => updateRow(row.id, { amount: e.target.value })}
+                      className="h-9"
+                    />
+                  </div>
+
+                  {/* Notes */}
+                  <div className="space-y-1.5">
+                    <Label className="text-xs">Notes (optional)</Label>
+                    <Input
+                      placeholder="What was this used for?"
+                      value={row.notes}
+                      onChange={(e) => updateRow(row.id, { notes: e.target.value })}
+                      className="h-9"
+                      maxLength={512}
+                    />
+                  </div>
+                </div>
+              </div>
+            );
+          })}
+
+          {/* Add Row */}
+          <Button
+            type="button"
+            variant="outline"
+            size="sm"
+            className="w-full"
+            onClick={addRow}
+          >
+            <Plus className="mr-2 h-3.5 w-3.5" />
+            Add Another Item
+          </Button>
+
+          {/* Actions */}
+          <div className="flex justify-end gap-2 pt-2">
+            <Button
+              type="button"
+              variant="outline"
+              onClick={resetAndClose}
+              disabled={isPending}
+            >
+              Cancel
+            </Button>
+            <Button
+              type="button"
+              onClick={handleSubmit}
+              disabled={isPending || !isValid()}
+            >
+              {isPending
+                ? "Logging..."
+                : rows.length === 1
+                  ? "Log Usage"
+                  : `Log ${rows.length} Items`}
+            </Button>
+          </div>
+        </div>
+      </DialogContent>
+    </Dialog>
+  );
+}

src/data/usage.queries.ts

@@ -0,0 +1,114 @@
+import { prisma } from "@/lib/prisma";
+import { Prisma } from "@prisma/client";
+import type { DataTableSearchParams } from "@/types/table.types";
+
+// ─── Item picker data ─────────────────────────────────
+
+export interface PickerItem {
+  id: string;
+  name: string;
+  type: "FILAMENT" | "RESIN" | "PAINT" | "SUPPLY";
+  unit: string;
+}
+
+export async function getAllUserItems(userId: string): Promise<PickerItem[]> {
+  const [filaments, resins, paints, supplies] = await Promise.all([
+    prisma.filament.findMany({
+      where: { userId, archived: false },
+      select: { id: true, name: true },
+      orderBy: { name: "asc" },
+    }),
+    prisma.resin.findMany({
+      where: { userId, archived: false },
+      select: { id: true, name: true },
+      orderBy: { name: "asc" },
+    }),
+    prisma.paint.findMany({
+      where: { userId, archived: false },
+      select: { id: true, name: true },
+      orderBy: { name: "asc" },
+    }),
+    prisma.supply.findMany({
+      where: { userId, archived: false },
+      select: { id: true, name: true, unit: true },
+      orderBy: { name: "asc" },
+    }),
+  ]);
+
+  return [
+    ...filaments.map((f) => ({ id: f.id, name: f.name, type: "FILAMENT" as const, unit: "g" })),
+    ...resins.map((r) => ({ id: r.id, name: r.name, type: "RESIN" as const, unit: "ml" })),
+    ...paints.map((p) => ({ id: p.id, name: p.name, type: "PAINT" as const, unit: "ml" })),
+    ...supplies.map((s) => ({ id: s.id, name: s.name, type: "SUPPLY" as const, unit: s.unit })),
+  ];
+}
+
+// ─── Usage log history ────────────────────────────────
+
+export interface UsageLogRow {
+  id: string;
+  itemType: string;
+  itemName: string;
+  amount: number;
+  unit: string;
+  notes: string | null;
+  createdAt: Date;
+}
+
+interface UsageSearchParams extends DataTableSearchParams {
+  itemType?: string | string[];
+}
+
+export async function getUsageLogs(userId: string, params: UsageSearchParams) {
+  const page = Number(params.page) || 1;
+  const perPage = Number(params.perPage) || 20;
+  const skip = (page - 1) * perPage;
+
+  const itemTypes = Array.isArray(params.itemType)
+    ? params.itemType
+    : params.itemType
+      ? [params.itemType]
+      : [];
+
+  const where: Prisma.UsageLogWhereInput = {
+    userId,
+    ...(itemTypes.length > 0 && { itemType: { in: itemTypes } }),
+  };
+
+  const sortField = params.sort || "createdAt";
+  const sortOrder = params.order || "desc";
+
+  const [logs, totalCount] = await Promise.all([
+    prisma.usageLog.findMany({
+      where,
+      orderBy: { [sortField]: sortOrder },
+      skip,
+      take: perPage,
+      include: {
+        filament: { select: { name: true } },
+        resin: { select: { name: true } },
+        paint: { select: { name: true } },
+        supply: { select: { name: true } },
+      },
+    }),
+    prisma.usageLog.count({ where }),
+  ]);
+
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const data: UsageLogRow[] = logs.map((log: any) => ({
+    id: log.id,
+    itemType: log.itemType,
+    itemName:
+      log.filament?.name ?? log.resin?.name ?? log.paint?.name ?? log.supply?.name ?? "Unknown",
+    amount: log.amount,
+    unit: log.unit,
+    notes: log.notes,
+    createdAt: log.createdAt,
+  }));
+
+  return {
+    data,
+    pageCount: Math.ceil(totalCount / perPage),
+    totalCount,
+  };
+}

src/lib/constants.ts

@@ -6,6 +6,7 @@ export const NAV_ITEMS = [
   { label: "Resins", href: "/resins", icon: "Droplets" },
   { label: "Paints", href: "/paints", icon: "Paintbrush" },
   { label: "Supplies", href: "/supplies", icon: "Gem" },
+  { label: "Usage", href: "/usage", icon: "ClipboardList" },
   { label: "Vendors", href: "/vendors", icon: "Building2" },
   { label: "Locations", href: "/locations", icon: "MapPin" },
   { label: "Settings", href: "/settings", icon: "Settings" },