commit ef2e53ea18b347e66f0702099b63f7407dad8196
Author: mikael-lovqvists-claude-agent <mikaels.claude.agent@efforting.tech>
Date:   Fri Mar 20 19:11:13 2026 +0000

    Initial electronics inventory webapp
    
    KV-store backed Express 5 app for tracking electronic components,
    their arbitrary fields, and inventory locations (physical, BOM, digital).
    
    Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..902b281
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules/
+data/
diff --git a/lib/ids.mjs b/lib/ids.mjs
new file mode 100644
index 0000000..50432f2
--- /dev/null
+++ b/lib/ids.mjs
@@ -0,0 +1,3 @@
+export function generate_id() {
+	return Date.now().toString(36) + Math.random().toString(36).slice(2, 8);
+}
diff --git a/lib/kv-store.mjs b/lib/kv-store.mjs
new file mode 100644
index 0000000..4d7a003
--- /dev/null
+++ b/lib/kv-store.mjs
@@ -0,0 +1,201 @@
+import fs from 'node:fs';
+
+function DEFAULT_SERIALIZER_FACTORY() {
+	const s = new Serializer();
+
+	//TODO - buffers and possibly typed arrays
+	s.register_constructor(BigInt, 'Bi', (raw) => raw.toString(), (stored) => BigInt(stored));
+	s.register_constructor(Buffer, 'Bu', (raw) => raw.toString('base64'), (stored) => Buffer.from(stored, 'base64'));
+	s.register_default('P', (raw) => (JSON.stringify(raw), raw), (stored) => stored);
+
+	return s;
+}
+
+class Serializer {
+	constructor(constructor_lut=new Map(), identity_lut=new Map(), type_lut=new Map()) {
+		Object.assign(this, { constructor_lut, identity_lut, type_lut, default: null });
+	}
+
+	serialize(value) {
+		const { constructor_lut, identity_lut } = this;
+
+		const by_identity = identity_lut.get(value);
+		if (by_identity) {
+			const { type_id, serialize_value } = by_identity;
+			return [ type_id, serialize_value(value) ];
+		}
+
+		const by_constructor = constructor_lut.get(value.constructor);
+		if (by_constructor) {
+			const { type_id, serialize_value } = by_constructor;
+			return [ type_id, serialize_value(value) ];
+		}
+
+		return [this.default.type_id, this.default.serialize_value(value)];
+	}
+
+	deserialize(value) {
+		if (value === undefined) {
+			throw new Error(`Deserialize called without value`);
+		}
+		const [ type_id, raw_value ] = value;
+		const { type_lut } = this;
+
+		const operation = type_lut.get(type_id);
+		if (!operation) {
+			throw new Error(`Unknown type_id: ${type_id}`);
+		}
+		const { deserialize_value } = operation;
+		return deserialize_value(raw_value);
+	}
+
+	register_default(type_id, serialize_value, deserialize_value) {
+		const { type_lut } = this;
+		const operation = { selector: 'default', type_id, serialize_value, deserialize_value };
+		type_lut.set(type_id, operation);
+		this.default = operation;
+	}
+
+	register_constructor(constructor, type_id, serialize_value, deserialize_value) {
+		const { constructor_lut, type_lut } = this;
+		const operation = { selector: 'constructor', constructor, type_id, serialize_value, deserialize_value };
+		constructor_lut.set(constructor, operation);
+		type_lut.set(type_id, operation);
+	}
+
+	register_identity(identity, type_id, serialize_value, deserialize_value) {
+		const { identity_lut, type_lut } = this;
+		const operation = { selector: 'identity', identity, type_id, serialize_value, deserialize_value };
+		identity_lut.set(identity, operation);
+		type_lut.set(type_id, operation);
+	}
+}
+
+
+
+const DEFAULT_SETTINGS = {
+	auto_load: false,
+	auto_store: false,
+	auto_store_events: [
+		'SIGINT',
+		'SIGTERM',
+		'exit',
+	],
+	debounce_flush_timeout: null,
+}
+
+
+export class Simple_KeyValue_Store {
+	#flush_debounce_timer = null
+
+	constructor(storage_path, settings=DEFAULT_SETTINGS, data=new Map(), serializer=DEFAULT_SERIALIZER_FACTORY()) {
+
+		const actual_settings = { ...DEFAULT_SETTINGS, ...settings };
+		Object.assign(this, { storage_path, data, serializer, ...actual_settings });
+
+		if (this.auto_load) {
+			this.load();
+		}
+
+		if (this.auto_store) {
+			for (const event of this.auto_store_events) {
+				process.on(event, () => (this.store(), process.exit()) );
+			}
+		}
+
+	}
+
+	trigger_flush_debouncer() {
+		if (this.#flush_debounce_timer) {
+			clearTimeout(this.#flush_debounce_timer);
+			this.#flush_debounce_timer = null;
+		}
+
+		const { debounce_flush_timeout } = this;
+		if (debounce_flush_timeout) {
+			this.#flush_debounce_timer = setTimeout(() => {
+				this.#flush_debounce_timer = null;
+				this.store();
+			}, debounce_flush_timeout);
+		}
+	}
+
+
+	create_pending_filename() {
+		const suffix = process.hrtime.bigint().toString(16);
+		const { storage_path } = this;
+		return `${storage_path}-${suffix}.tmp`;
+	}
+
+	get(key) {
+		const { serializer } = this;
+		const raw_entry = this.data.get(key);
+		if (raw_entry !== undefined) {
+			return serializer.deserialize(raw_entry);
+		}
+	}
+
+	set(key, value) {
+		const { serializer } = this;
+		this.data.set(key, serializer.serialize(value));
+		this.trigger_flush_debouncer();
+	}
+
+	delete(key) {
+		const result = this.data.delete(key);
+		if (result) {
+			this.trigger_flush_debouncer();
+		}
+		return result;
+	}
+
+	load() {
+		const { data, storage_path } = this;
+		if (!fs.existsSync(storage_path)) {
+			return;
+		}
+
+		const file_contents = fs.readFileSync(storage_path, 'utf-8');
+
+		for (const line of file_contents.split('\n')) {
+			if (!line) continue;
+			const [key, value] = JSON.parse(line);
+			data.set(key, value);
+		}
+
+	}
+
+	store() {
+		if (this.#flush_debounce_timer) {
+			clearTimeout(this.#flush_debounce_timer);
+			this.#flush_debounce_timer = null;
+		}
+		const { data, storage_path } = this;
+		const pending_out_path = this.create_pending_filename();
+		const out_fd = fs.openSync(pending_out_path, 'w');
+		try {
+			for (const [key, value] of data.entries()) {
+				fs.writeSync(out_fd, JSON.stringify([key, value]) + '\n');
+			}
+			fs.closeSync(out_fd);
+			fs.renameSync(pending_out_path, storage_path);
+		} finally {
+			try { fs.closeSync(out_fd); } catch {}
+			try { fs.unlinkSync(pending_out_path); } catch {}
+		}
+	}
+
+}
+
+
+/*
+const kvs = new Simple_KeyValue_Store('./data.ndjson', { auto_load: true, auto_store: true, debounce_flush_timeout: 10_000 });
+
+console.log(kvs.get('hello'), kvs.get('shello'), kvs.get('Path'));
+kvs.set('hello', 123456789n)
+
+console.log(Buffer.from([123, 10, 20]));
+kvs.set('Path', Buffer.from([123, 10, 20]));
+
+process.exit()	//Exit immediately instead of waiting for debounce_timer (this also prevents double store - we should document this properly)
+*/
\ No newline at end of file
diff --git a/lib/storage.mjs b/lib/storage.mjs
new file mode 100644
index 0000000..88259d8
--- /dev/null
+++ b/lib/storage.mjs
@@ -0,0 +1,82 @@
+import { mkdirSync } from 'node:fs';
+import { Simple_KeyValue_Store } from './kv-store.mjs';
+
+mkdirSync('./data', { recursive: true });
+
+const store = new Simple_KeyValue_Store('./data/inventory.ndjson', {
+	auto_load: true,
+	auto_store: true,
+	debounce_flush_timeout: 5000,
+});
+
+// --- Field definitions ---
+
+export function list_fields() {
+	const result = [];
+	for (const [key] of store.data.entries()) {
+		if (key.startsWith('f:')) {
+			result.push(store.get(key));
+		}
+	}
+	return result.sort((a, b) => a.name.localeCompare(b.name));
+}
+
+export function get_field(id) {
+	return store.get(`f:${id}`) ?? null;
+}
+
+export function set_field(field) {
+	store.set(`f:${field.id}`, field);
+}
+
+export function delete_field(id) {
+	return store.delete(`f:${id}`);
+}
+
+// --- Components ---
+
+export function list_components() {
+	const result = [];
+	for (const [key] of store.data.entries()) {
+		if (key.startsWith('c:')) {
+			result.push(store.get(key));
+		}
+	}
+	return result.sort((a, b) => a.name.localeCompare(b.name));
+}
+
+export function get_component(id) {
+	return store.get(`c:${id}`) ?? null;
+}
+
+export function set_component(component) {
+	store.set(`c:${component.id}`, component);
+}
+
+export function delete_component(id) {
+	return store.delete(`c:${id}`);
+}
+
+// --- Inventory entries ---
+
+export function list_inventory() {
+	const result = [];
+	for (const [key] of store.data.entries()) {
+		if (key.startsWith('i:')) {
+			result.push(store.get(key));
+		}
+	}
+	return result.sort((a, b) => a.created_at - b.created_at);
+}
+
+export function get_inventory_entry(id) {
+	return store.get(`i:${id}`) ?? null;
+}
+
+export function set_inventory_entry(entry) {
+	store.set(`i:${entry.id}`, entry);
+}
+
+export function delete_inventory_entry(id) {
+	return store.delete(`i:${id}`);
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..2bb362c
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,829 @@
+{
+	"name": "electronics-inventory",
+	"version": "0.1.0",
+	"lockfileVersion": 3,
+	"requires": true,
+	"packages": {
+		"": {
+			"name": "electronics-inventory",
+			"version": "0.1.0",
+			"dependencies": {
+				"express": "^5.2.1"
+			},
+			"engines": {
+				"node": ">=25"
+			}
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+			"license": "MIT",
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+				"mime-types": "^3.0.0",
+				"negotiator": "^1.0.0"
+			},
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+			"dependencies": {
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+				"escape-html": "^1.0.3",
+				"parseurl": "^1.3.3",
+				"send": "^1.2.0"
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+			"license": "ISC"
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+			},
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+			},
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+			"dependencies": {
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+				"es-errors": "^1.3.0",
+				"get-intrinsic": "^1.2.5",
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+				"url": "https://github.com/sponsors/ljharb"
+			}
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+			"license": "MIT",
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+			}
+		},
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+			"license": "MIT",
+			"engines": {
+				"node": ">=0.6"
+			}
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+			"license": "MIT",
+			"dependencies": {
+				"content-type": "^1.0.5",
+				"media-typer": "^1.1.0",
+				"mime-types": "^3.0.0"
+			},
+			"engines": {
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+			"license": "MIT",
+			"engines": {
+				"node": ">= 0.8"
+			}
+		},
+		"node_modules/vary": {
+			"version": "1.1.2",
+			"resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
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+			"license": "MIT",
+			"engines": {
+				"node": ">= 0.8"
+			}
+		},
+		"node_modules/wrappy": {
+			"version": "1.0.2",
+			"resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+			"integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+			"license": "ISC"
+		}
+	}
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..88ad803
--- /dev/null
+++ b/package.json
@@ -0,0 +1,12 @@
+{
+	"name": "electronics-inventory",
+	"version": "0.1.0",
+	"type": "module",
+	"engines": { "node": ">=25" },
+	"scripts": {
+		"start": "node server.mjs"
+	},
+	"dependencies": {
+		"express": "^5.2.1"
+	}
+}
diff --git a/public/app.mjs b/public/app.mjs
new file mode 100644
index 0000000..101cd61
--- /dev/null
+++ b/public/app.mjs
@@ -0,0 +1,621 @@
+import { qs, clone, set_text } from './lib/dom.mjs';
+import * as api from './lib/api.mjs';
+
+// ---------------------------------------------------------------------------
+// State
+// ---------------------------------------------------------------------------
+
+let section = 'components';
+let all_components = [];
+let all_fields = [];
+let all_inventory = [];
+let component_search = '';
+let inventory_search = '';
+let inventory_type_filter = '';
+
+// ---------------------------------------------------------------------------
+// Data loading
+// ---------------------------------------------------------------------------
+
+async function load_all() {
+	const [cf, ci, cmp] = await Promise.all([
+		api.get_fields(),
+		api.get_inventory(),
+		api.get_components(),
+	]);
+	all_fields = cf.fields;
+	all_inventory = ci.entries;
+	all_components = cmp.components;
+}
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+const LOCATION_TYPE_LABEL = { physical: 'Physical', bom: 'BOM', digital: 'Digital' };
+const LOCATION_TYPE_ICON  = { physical: '📦', bom: '📋', digital: '💡' };
+
+function ref_label_for_type(type) {
+	if (type === 'physical') return 'Location (drawer, bin, shelf…)';
+	if (type === 'bom') return 'Document / project name';
+	return 'Note / description';
+}
+
+function inventory_for_component(component_id) {
+	return all_inventory.filter(e => e.component_id === component_id);
+}
+
+function component_by_id(id) {
+	return all_components.find(c => c.id === id);
+}
+
+function field_by_id(id) {
+	return all_fields.find(f => f.id === id);
+}
+
+function matches_search(component, query) {
+	if (!query) return true;
+	const q = query.toLowerCase();
+	if (component.name.toLowerCase().includes(q)) return true;
+	if (component.description.toLowerCase().includes(q)) return true;
+	for (const val of Object.values(component.fields ?? {})) {
+		if (String(val).toLowerCase().includes(q)) return true;
+	}
+	// Also search inventory locations for this component
+	for (const entry of inventory_for_component(component.id)) {
+		if (entry.location_ref.toLowerCase().includes(q)) return true;
+	}
+	return false;
+}
+
+function matches_inventory_search(entry, query, type_filter) {
+	if (type_filter && entry.location_type !== type_filter) return false;
+	if (!query) return true;
+	const q = query.toLowerCase();
+	const comp = component_by_id(entry.component_id);
+	if (comp && comp.name.toLowerCase().includes(q)) return true;
+	if (entry.location_ref.toLowerCase().includes(q)) return true;
+	if (entry.notes.toLowerCase().includes(q)) return true;
+	return false;
+}
+
+// ---------------------------------------------------------------------------
+// Render: Components section
+// ---------------------------------------------------------------------------
+
+function render_components() {
+	const main = document.getElementById('main');
+	let section_el = document.getElementById('section-components');
+	if (!section_el) {
+		const frag = document.getElementById('t-section-components').content.cloneNode(true);
+		main.replaceChildren(frag);
+		section_el = document.getElementById('section-components');
+
+		qs(section_el, '#component-search').addEventListener('input', (e) => {
+			component_search = e.target.value;
+			render_component_list();
+		});
+		qs(section_el, '#btn-add-component').addEventListener('click', () => open_component_dialog());
+	}
+
+	qs(section_el, '#component-search').value = component_search;
+	render_component_list();
+}
+
+function render_component_list() {
+	const list_el = document.getElementById('component-list');
+	const query = component_search.trim();
+	const visible = all_components.filter(c => matches_search(c, query));
+
+	if (visible.length === 0) {
+		const empty = document.createElement('div');
+		empty.className = 'empty-state';
+		empty.textContent = query ? 'No components match your search.' : 'No components yet. Add one!';
+		list_el.replaceChildren(empty);
+		return;
+	}
+
+	list_el.replaceChildren(...visible.map(build_component_row));
+}
+
+function build_component_row(comp) {
+	const row = clone('t-component-row');
+	set_text(row, '.component-name', comp.name);
+	set_text(row, '.component-description', comp.description || '');
+
+	// Field tags
+	const fields_el = qs(row, '.component-fields');
+	const field_entries = Object.entries(comp.fields ?? {});
+	if (field_entries.length > 0) {
+		fields_el.replaceChildren(...field_entries.map(([fid, val]) => {
+			const tag = clone('t-field-tag');
+			const def = field_by_id(fid);
+			const label = def ? def.name : fid;
+			const display_val = def?.unit ? `${val} ${def.unit}` : String(val);
+			set_text(tag, '.tag-name', label);
+			set_text(tag, '.tag-value', display_val);
+			return tag;
+		}));
+	}
+
+	// Location badges
+	const locs_el = qs(row, '.component-locations');
+	const entries = inventory_for_component(comp.id);
+	if (entries.length > 0) {
+		locs_el.replaceChildren(...entries.map(entry => {
+			const badge = clone('t-location-badge');
+			badge.classList.add(`type-${entry.location_type}`);
+			set_text(badge, '.badge-icon', LOCATION_TYPE_ICON[entry.location_type] ?? '');
+			const ref_text = entry.location_ref || LOCATION_TYPE_LABEL[entry.location_type];
+			const qty_text = entry.quantity ? ` ×${entry.quantity}` : '';
+			set_text(badge, '.badge-text', ref_text + qty_text);
+			return badge;
+		}));
+	}
+
+	qs(row, '.btn-edit').addEventListener('click', () => open_component_dialog(comp));
+	qs(row, '.btn-delete').addEventListener('click', () => confirm_delete(
+		`Delete component "${comp.name}"? Inventory entries for it will remain but become orphaned.`,
+		async () => {
+			await api.delete_component(comp.id);
+			all_components = all_components.filter(c => c.id !== comp.id);
+			render_component_list();
+		}
+	));
+
+	return row;
+}
+
+// ---------------------------------------------------------------------------
+// Render: Inventory section
+// ---------------------------------------------------------------------------
+
+function render_inventory() {
+	const main = document.getElementById('main');
+	let section_el = document.getElementById('section-inventory');
+	if (!section_el) {
+		const frag = document.getElementById('t-section-inventory').content.cloneNode(true);
+		main.replaceChildren(frag);
+		section_el = document.getElementById('section-inventory');
+
+		qs(section_el, '#inventory-search').addEventListener('input', (e) => {
+			inventory_search = e.target.value;
+			render_inventory_list();
+		});
+		qs(section_el, '#inventory-type-filter').addEventListener('change', (e) => {
+			inventory_type_filter = e.target.value;
+			render_inventory_list();
+		});
+		qs(section_el, '#btn-add-inventory').addEventListener('click', () => open_inventory_dialog());
+	}
+
+	qs(section_el, '#inventory-search').value = inventory_search;
+	qs(section_el, '#inventory-type-filter').value = inventory_type_filter;
+	render_inventory_list();
+}
+
+function render_inventory_list() {
+	const list_el = document.getElementById('inventory-list');
+	const visible = all_inventory.filter(e => matches_inventory_search(e, inventory_search.trim(), inventory_type_filter));
+
+	if (visible.length === 0) {
+		const empty = document.createElement('div');
+		empty.className = 'empty-state';
+		empty.textContent = 'No inventory entries match your filter.';
+		list_el.replaceChildren(empty);
+		return;
+	}
+
+	list_el.replaceChildren(...visible.map(build_inventory_row));
+}
+
+function build_inventory_row(entry) {
+	const row = clone('t-inventory-row');
+	const comp = component_by_id(entry.component_id);
+	set_text(row, '.inv-component-name', comp ? comp.name : '(deleted component)');
+
+	const pill = document.createElement('span');
+	pill.className = `type-pill type-${entry.location_type}`;
+	pill.textContent = LOCATION_TYPE_LABEL[entry.location_type] ?? entry.location_type;
+	qs(row, '.inv-type-badge').replaceChildren(pill);
+
+	set_text(row, '.inv-location-ref', entry.location_ref);
+	set_text(row, '.inv-quantity', entry.quantity);
+	set_text(row, '.inv-notes', entry.notes);
+
+	qs(row, '.btn-edit').addEventListener('click', () => open_inventory_dialog(entry));
+	qs(row, '.btn-delete').addEventListener('click', () => confirm_delete(
+		`Delete this inventory entry (${LOCATION_TYPE_LABEL[entry.location_type]}: ${entry.location_ref || '—'})?`,
+		async () => {
+			await api.delete_inventory(entry.id);
+			all_inventory = all_inventory.filter(e => e.id !== entry.id);
+			render_inventory_list();
+		}
+	));
+
+	return row;
+}
+
+// ---------------------------------------------------------------------------
+// Render: Fields section
+// ---------------------------------------------------------------------------
+
+function render_fields() {
+	const main = document.getElementById('main');
+	let section_el = document.getElementById('section-fields');
+	if (!section_el) {
+		const frag = document.getElementById('t-section-fields').content.cloneNode(true);
+		main.replaceChildren(frag);
+		section_el = document.getElementById('section-fields');
+		qs(section_el, '#btn-add-field').addEventListener('click', () => open_field_dialog());
+	}
+	render_field_list();
+}
+
+function render_field_list() {
+	const list_el = document.getElementById('field-list');
+
+	if (all_fields.length === 0) {
+		const empty = document.createElement('div');
+		empty.className = 'empty-state';
+		empty.textContent = 'No field definitions yet. Add some!';
+		list_el.replaceChildren(empty);
+		return;
+	}
+
+	list_el.replaceChildren(...all_fields.map(build_field_row));
+}
+
+function build_field_row(fdef) {
+	const row = clone('t-field-row');
+	set_text(row, '.fdef-name', fdef.name);
+	set_text(row, '.fdef-unit', fdef.unit || '—');
+	set_text(row, '.fdef-description', fdef.description || '');
+
+	qs(row, '.btn-edit').addEventListener('click', () => open_field_dialog(fdef));
+	qs(row, '.btn-delete').addEventListener('click', () => confirm_delete(
+		`Delete field definition "${fdef.name}"? This will not remove values already stored on components.`,
+		async () => {
+			await api.delete_field(fdef.id);
+			all_fields = all_fields.filter(f => f.id !== fdef.id);
+			render_field_list();
+		}
+	));
+
+	return row;
+}
+
+// ---------------------------------------------------------------------------
+// Dialog: Component
+// ---------------------------------------------------------------------------
+
+let component_dialog_callback = null;
+
+function open_component_dialog(comp = null) {
+	const dlg = document.getElementById('dialog-component');
+	const title = qs(dlg, '.dialog-title');
+	const name_input = qs(dlg, '#c-name');
+	const desc_input = qs(dlg, '#c-description');
+	const field_rows_el = qs(dlg, '#c-field-rows');
+	const add_field_sel = qs(dlg, '#c-add-field-select');
+
+	title.textContent = comp ? `Edit component` : 'Add component';
+	name_input.value = comp?.name ?? '';
+	desc_input.value = comp?.description ?? '';
+
+	// Build field rows from component's existing values
+	const active_fields = new Map(Object.entries(comp?.fields ?? {}));
+
+	function rebuild_field_rows() {
+		field_rows_el.replaceChildren(...[...active_fields.entries()].map(([fid, val]) => {
+			const def = field_by_id(fid);
+			const label_text = def ? def.name : fid;
+			const unit_text = def?.unit ? ` [${def.unit}]` : '';
+
+			const row_el = document.createElement('div');
+			row_el.className = 'c-field-input-row';
+
+			const label_el = document.createElement('div');
+			label_el.className = 'c-field-input-label';
+			label_el.textContent = label_text;
+			if (unit_text) {
+				const unit_span = document.createElement('span');
+				unit_span.className = 'c-field-unit-hint';
+				unit_span.textContent = unit_text;
+				label_el.appendChild(unit_span);
+			}
+
+			const input_el = document.createElement('input');
+			input_el.type = 'text';
+			input_el.className = 'c-field-value';
+			input_el.value = val;
+			input_el.autocomplete = 'off';
+			input_el.dataset.field_id = fid;
+			input_el.addEventListener('input', (e) => {
+				active_fields.set(fid, e.target.value);
+			});
+
+			const remove_btn = document.createElement('button');
+			remove_btn.type = 'button';
+			remove_btn.className = 'btn-icon btn-danger';
+			remove_btn.textContent = '✕';
+			remove_btn.title = 'Remove field value';
+			remove_btn.addEventListener('click', () => {
+				active_fields.delete(fid);
+				rebuild_field_rows();
+				rebuild_add_select();
+			});
+
+			row_el.appendChild(label_el);
+			row_el.appendChild(input_el);
+			row_el.appendChild(remove_btn);
+			return row_el;
+		}));
+	}
+
+	function rebuild_add_select() {
+		const available = all_fields.filter(f => !active_fields.has(f.id));
+		add_field_sel.replaceChildren(
+			Object.assign(document.createElement('option'), { value: '', textContent: '— add a field —' }),
+			...available.map(f => Object.assign(document.createElement('option'), {
+				value: f.id,
+				textContent: f.name + (f.unit ? ` [${f.unit}]` : ''),
+			}))
+		);
+	}
+
+	rebuild_field_rows();
+	rebuild_add_select();
+
+	// Wire add-field select
+	const old_handler = add_field_sel._change_handler;
+	if (old_handler) add_field_sel.removeEventListener('change', old_handler);
+	add_field_sel._change_handler = (e) => {
+		const fid = e.target.value;
+		if (!fid) return;
+		active_fields.set(fid, '');
+		rebuild_field_rows();
+		rebuild_add_select();
+		// Focus the new input
+		const inputs = field_rows_el.querySelectorAll(`[data-field_id="${fid}"]`);
+		if (inputs.length) inputs[inputs.length - 1].focus();
+	};
+	add_field_sel.addEventListener('change', add_field_sel._change_handler);
+
+	component_dialog_callback = async () => {
+		const name = name_input.value.trim();
+		if (!name) return;
+		const fields = {};
+		for (const [fid, val] of active_fields.entries()) {
+			if (val.trim()) fields[fid] = val.trim();
+		}
+		const body = { name, description: desc_input.value.trim(), fields };
+		if (comp) {
+			const result = await api.update_component(comp.id, body);
+			const idx = all_components.findIndex(c => c.id === comp.id);
+			if (idx !== -1) all_components[idx] = result.component;
+		} else {
+			const result = await api.create_component(body);
+			all_components.push(result.component);
+			all_components.sort((a, b) => a.name.localeCompare(b.name));
+		}
+	};
+
+	dlg.showModal();
+	name_input.focus();
+}
+
+// ---------------------------------------------------------------------------
+// Dialog: Inventory entry
+// ---------------------------------------------------------------------------
+
+let inventory_dialog_callback = null;
+
+function open_inventory_dialog(entry = null) {
+	const dlg = document.getElementById('dialog-inventory');
+	const title = qs(dlg, '.dialog-title');
+	const comp_sel = qs(dlg, '#i-component');
+	const type_sel = qs(dlg, '#i-type');
+	const ref_input = qs(dlg, '#i-ref');
+	const ref_label = qs(dlg, '#i-ref-label');
+	const qty_input = qs(dlg, '#i-qty');
+	const notes_input = qs(dlg, '#i-notes');
+
+	title.textContent = entry ? 'Edit inventory entry' : 'Add inventory entry';
+
+	// Populate component dropdown
+	comp_sel.replaceChildren(
+		Object.assign(document.createElement('option'), { value: '', textContent: '— select component —' }),
+		...all_components.map(c => Object.assign(document.createElement('option'), {
+			value: c.id,
+			textContent: c.name,
+		}))
+	);
+	comp_sel.value = entry?.component_id ?? '';
+	type_sel.value = entry?.location_type ?? 'physical';
+	ref_input.value = entry?.location_ref ?? '';
+	qty_input.value = entry?.quantity ?? '';
+	notes_input.value = entry?.notes ?? '';
+
+	function update_ref_label() {
+		ref_label.textContent = ref_label_for_type(type_sel.value);
+	}
+	update_ref_label();
+
+	const old_type_handler = type_sel._change_handler;
+	if (old_type_handler) type_sel.removeEventListener('change', old_type_handler);
+	type_sel._change_handler = update_ref_label;
+	type_sel.addEventListener('change', type_sel._change_handler);
+
+	inventory_dialog_callback = async () => {
+		const body = {
+			component_id: comp_sel.value,
+			location_type: type_sel.value,
+			location_ref: ref_input.value.trim(),
+			quantity: qty_input.value.trim(),
+			notes: notes_input.value.trim(),
+		};
+		if (entry) {
+			const result = await api.update_inventory(entry.id, body);
+			const idx = all_inventory.findIndex(e => e.id === entry.id);
+			if (idx !== -1) all_inventory[idx] = result.entry;
+		} else {
+			const result = await api.create_inventory(body);
+			all_inventory.push(result.entry);
+		}
+	};
+
+	dlg.showModal();
+	comp_sel.focus();
+}
+
+// ---------------------------------------------------------------------------
+// Dialog: Field definition
+// ---------------------------------------------------------------------------
+
+let field_dialog_callback = null;
+
+function open_field_dialog(fdef = null) {
+	const dlg = document.getElementById('dialog-field');
+	const title = qs(dlg, '.dialog-title');
+	const name_input = qs(dlg, '#f-name');
+	const unit_input = qs(dlg, '#f-unit');
+	const desc_input = qs(dlg, '#f-description');
+
+	title.textContent = fdef ? 'Edit field' : 'Add field';
+	name_input.value = fdef?.name ?? '';
+	unit_input.value = fdef?.unit ?? '';
+	desc_input.value = fdef?.description ?? '';
+
+	field_dialog_callback = async () => {
+		const body = {
+			name: name_input.value.trim(),
+			unit: unit_input.value.trim(),
+			description: desc_input.value.trim(),
+		};
+		if (fdef) {
+			const result = await api.update_field(fdef.id, body);
+			const idx = all_fields.findIndex(f => f.id === fdef.id);
+			if (idx !== -1) all_fields[idx] = result.field;
+			all_fields.sort((a, b) => a.name.localeCompare(b.name));
+		} else {
+			const result = await api.create_field(body);
+			all_fields.push(result.field);
+			all_fields.sort((a, b) => a.name.localeCompare(b.name));
+		}
+	};
+
+	dlg.showModal();
+	name_input.focus();
+}
+
+// ---------------------------------------------------------------------------
+// Dialog: Confirm delete
+// ---------------------------------------------------------------------------
+
+let confirm_callback = null;
+
+function confirm_delete(message, on_confirm) {
+	const dlg = document.getElementById('dialog-confirm');
+	document.getElementById('confirm-message').textContent = message;
+	confirm_callback = on_confirm;
+	dlg.showModal();
+}
+
+// ---------------------------------------------------------------------------
+// Render dispatcher
+// ---------------------------------------------------------------------------
+
+function render() {
+	if (section === 'components') render_components();
+	else if (section === 'inventory') render_inventory();
+	else if (section === 'fields') render_fields();
+}
+
+// ---------------------------------------------------------------------------
+// Init
+// ---------------------------------------------------------------------------
+
+async function init() {
+	// Load templates
+	const html = await fetch('/templates.html').then(r => r.text());
+	document.body.insertAdjacentHTML('beforeend', html);
+
+	// Clone and mount dialogs
+	for (const id of ['t-dialog-component', 't-dialog-inventory', 't-dialog-field', 't-dialog-confirm']) {
+		const frag = document.getElementById(id).content.cloneNode(true);
+		document.body.appendChild(frag);
+	}
+
+	// Wire dialog form submissions
+	document.getElementById('form-component').addEventListener('submit', async (e) => {
+		e.preventDefault();
+		try {
+			await component_dialog_callback?.();
+			document.getElementById('dialog-component').close();
+			render();
+		} catch (err) {
+			alert(`Error: ${err.message}`);
+		}
+	});
+	document.getElementById('c-cancel').addEventListener('click', () => {
+		document.getElementById('dialog-component').close();
+	});
+
+	document.getElementById('form-inventory').addEventListener('submit', async (e) => {
+		e.preventDefault();
+		try {
+			await inventory_dialog_callback?.();
+			document.getElementById('dialog-inventory').close();
+			render();
+		} catch (err) {
+			alert(`Error: ${err.message}`);
+		}
+	});
+	document.getElementById('i-cancel').addEventListener('click', () => {
+		document.getElementById('dialog-inventory').close();
+	});
+
+	document.getElementById('form-field').addEventListener('submit', async (e) => {
+		e.preventDefault();
+		try {
+			await field_dialog_callback?.();
+			document.getElementById('dialog-field').close();
+			render();
+		} catch (err) {
+			alert(`Error: ${err.message}`);
+		}
+	});
+	document.getElementById('f-cancel').addEventListener('click', () => {
+		document.getElementById('dialog-field').close();
+	});
+
+	document.getElementById('confirm-ok').addEventListener('click', async () => {
+		try {
+			await confirm_callback?.();
+			document.getElementById('dialog-confirm').close();
+			render();
+		} catch (err) {
+			alert(`Error: ${err.message}`);
+		}
+	});
+	document.getElementById('confirm-cancel').addEventListener('click', () => {
+		document.getElementById('dialog-confirm').close();
+	});
+
+	// Nav wiring
+	document.querySelectorAll('.nav-btn').forEach(btn => {
+		btn.addEventListener('click', () => {
+			document.querySelectorAll('.nav-btn').forEach(b => b.classList.remove('active'));
+			btn.classList.add('active');
+			section = btn.dataset.section;
+			render();
+		});
+	});
+
+	// Load data
+	await load_all();
+	render();
+}
+
+init();
diff --git a/public/index.html b/public/index.html
new file mode 100644
index 0000000..969c583
--- /dev/null
+++ b/public/index.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1.0">
+	<title>Electronics Inventory</title>
+	<link rel="stylesheet" href="style.css">
+	<link rel="preload" as="fetch" href="/templates.html" crossorigin>
+</head>
+<body>
+	<header>
+		<div class="app-title">Electronics Inventory</div>
+		<nav>
+			<button class="nav-btn active" data-section="components">Components</button>
+			<button class="nav-btn" data-section="inventory">Inventory</button>
+			<button class="nav-btn" data-section="fields">Fields</button>
+		</nav>
+	</header>
+	<main id="main"></main>
+	<script type="module" src="app.mjs"></script>
+</body>
+</html>
diff --git a/public/lib/api.mjs b/public/lib/api.mjs
new file mode 100644
index 0000000..44b7d7f
--- /dev/null
+++ b/public/lib/api.mjs
@@ -0,0 +1,29 @@
+async function req(method, path, body) {
+	const opts = { method, headers: {} };
+	if (body !== undefined) {
+		opts.headers['Content-Type'] = 'application/json';
+		opts.body = JSON.stringify(body);
+	}
+	const res = await fetch(path, opts);
+	const data = await res.json();
+	if (!data.ok) throw new Error(data.error ?? 'Request failed');
+	return data;
+}
+
+// Fields
+export const get_fields     = () => req('GET', '/api/fields');
+export const create_field   = (body) => req('POST', '/api/fields', body);
+export const update_field   = (id, body) => req('PUT', `/api/fields/${id}`, body);
+export const delete_field   = (id) => req('DELETE', `/api/fields/${id}`);
+
+// Components
+export const get_components  = () => req('GET', '/api/components');
+export const create_component = (body) => req('POST', '/api/components', body);
+export const update_component = (id, body) => req('PUT', `/api/components/${id}`, body);
+export const delete_component = (id) => req('DELETE', `/api/components/${id}`);
+
+// Inventory
+export const get_inventory      = () => req('GET', '/api/inventory');
+export const create_inventory   = (body) => req('POST', '/api/inventory', body);
+export const update_inventory   = (id, body) => req('PUT', `/api/inventory/${id}`, body);
+export const delete_inventory   = (id) => req('DELETE', `/api/inventory/${id}`);
diff --git a/public/lib/dom.mjs b/public/lib/dom.mjs
new file mode 100644
index 0000000..3e5ce55
--- /dev/null
+++ b/public/lib/dom.mjs
@@ -0,0 +1,16 @@
+export function qs(scope, selector) {
+	if (typeof scope === 'string') return document.querySelector(scope);
+	return scope.querySelector(selector);
+}
+
+export function clone(template_id) {
+	return document.getElementById(template_id).content.cloneNode(true).firstElementChild;
+}
+
+export function set_text(el, selector, text) {
+	const target = typeof selector === 'string' ? el.querySelector(selector) : selector;
+	target.textContent = text;
+}
+
+export function show(el) { el.hidden = false; }
+export function hide(el) { el.hidden = true; }
diff --git a/public/style.css b/public/style.css
new file mode 100644
index 0000000..2b8cc99
--- /dev/null
+++ b/public/style.css
@@ -0,0 +1,592 @@
+*, *::before, *::after {
+	box-sizing: border-box;
+	margin: 0;
+	padding: 0;
+}
+
+:root {
+	--bg: #141414;
+	--surface: #1e1e1e;
+	--surface-raised: #252525;
+	--border: #2d2d2d;
+	--border-focus: #4a7fc1;
+	--text: #e0e0e0;
+	--text-dim: #888;
+	--text-faint: #555;
+	--accent: #5b9cf6;
+	--accent-hover: #7ab3ff;
+	--danger: #e05555;
+	--danger-hover: #f07070;
+	--success: #4caf50;
+	--warning: #ff9800;
+	--purple: #ab7de8;
+
+	--badge-physical-bg: #1a3320;
+	--badge-physical-text: #6fcf97;
+	--badge-bom-bg: #332a10;
+	--badge-bom-text: #f2c94c;
+	--badge-digital-bg: #251a33;
+	--badge-digital-text: #bb6bd9;
+
+	--font: 'Segoe UI', system-ui, sans-serif;
+	--font-mono: 'Fira Code', 'Cascadia Code', monospace;
+}
+
+body {
+	background: var(--bg);
+	color: var(--text);
+	font-family: var(--font);
+	font-size: 0.95rem;
+	line-height: 1.5;
+	min-height: 100vh;
+	display: flex;
+	flex-direction: column;
+}
+
+/* ===== HEADER ===== */
+
+header {
+	display: flex;
+	align-items: center;
+	gap: 2rem;
+	padding: 0.75rem 1.5rem;
+	background: var(--surface);
+	border-bottom: 1px solid var(--border);
+	position: sticky;
+	top: 0;
+	z-index: 100;
+}
+
+.app-title {
+	font-size: 1.1rem;
+	font-weight: 600;
+	letter-spacing: 0.04em;
+	color: var(--accent);
+	white-space: nowrap;
+}
+
+nav {
+	display: flex;
+	gap: 0.25rem;
+}
+
+.nav-btn {
+	background: none;
+	border: none;
+	color: var(--text-dim);
+	padding: 0.4rem 1rem;
+	cursor: pointer;
+	border-radius: 4px;
+	font-size: 0.9rem;
+	font-family: inherit;
+	transition: color 0.1s, background 0.1s;
+}
+
+.nav-btn:hover {
+	color: var(--text);
+	background: var(--surface-raised);
+}
+
+.nav-btn.active {
+	color: var(--accent);
+	background: rgba(91, 156, 246, 0.12);
+}
+
+/* ===== MAIN ===== */
+
+#main {
+	flex: 1;
+	padding: 1.5rem;
+	max-width: 1200px;
+	width: 100%;
+	margin: 0 auto;
+}
+
+/* ===== SECTION TOOLBAR ===== */
+
+.section-toolbar {
+	display: flex;
+	align-items: center;
+	gap: 0.75rem;
+	margin-bottom: 1rem;
+}
+
+.section-note {
+	flex: 1;
+	color: var(--text-dim);
+	font-size: 0.85rem;
+}
+
+/* ===== SEARCH & FILTER ===== */
+
+.search-input {
+	flex: 1;
+	background: var(--surface);
+	border: 1px solid var(--border);
+	color: var(--text);
+	padding: 0.45rem 0.75rem;
+	border-radius: 4px;
+	font-size: 0.9rem;
+	font-family: inherit;
+	transition: border-color 0.1s;
+}
+
+.search-input:focus {
+	outline: none;
+	border-color: var(--border-focus);
+}
+
+.filter-select {
+	background: var(--surface);
+	border: 1px solid var(--border);
+	color: var(--text);
+	padding: 0.45rem 0.75rem;
+	border-radius: 4px;
+	font-size: 0.9rem;
+	font-family: inherit;
+	cursor: pointer;
+}
+
+.filter-select.wide {
+	flex: 1;
+}
+
+.filter-select:focus {
+	outline: none;
+	border-color: var(--border-focus);
+}
+
+/* ===== TABLE HEADERS ===== */
+
+.table-header {
+	display: grid;
+	padding: 0.4rem 0.75rem;
+	font-size: 0.75rem;
+	text-transform: uppercase;
+	letter-spacing: 0.07em;
+	color: var(--text-faint);
+	border-bottom: 1px solid var(--border);
+	margin-bottom: 0.25rem;
+}
+
+.inventory-grid {
+	grid-template-columns: 1fr 7rem 1fr 5rem 1fr 4.5rem;
+	gap: 0.5rem;
+	align-items: center;
+}
+
+.fields-grid {
+	grid-template-columns: 1fr 6rem 2fr 4.5rem;
+	gap: 0.5rem;
+	align-items: center;
+}
+
+/* ===== ITEM LIST ===== */
+
+.item-list {
+	display: flex;
+	flex-direction: column;
+	gap: 0.25rem;
+}
+
+.empty-state {
+	color: var(--text-faint);
+	text-align: center;
+	padding: 3rem 1rem;
+	font-size: 0.9rem;
+}
+
+/* ===== COMPONENT ROWS ===== */
+
+.component-row {
+	display: flex;
+	align-items: flex-start;
+	gap: 0.75rem;
+	background: var(--surface);
+	border: 1px solid var(--border);
+	border-radius: 6px;
+	padding: 0.75rem 1rem;
+	transition: border-color 0.1s;
+}
+
+.component-row:hover {
+	border-color: #3d3d3d;
+}
+
+.component-main {
+	flex: 1;
+	min-width: 0;
+	display: flex;
+	flex-direction: column;
+	gap: 0.35rem;
+}
+
+.component-header {
+	display: flex;
+	align-items: baseline;
+	gap: 0.75rem;
+	flex-wrap: wrap;
+}
+
+.component-name {
+	font-weight: 600;
+	font-size: 1rem;
+}
+
+.component-description {
+	color: var(--text-dim);
+	font-size: 0.85rem;
+	white-space: nowrap;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	max-width: 40ch;
+}
+
+.component-fields {
+	display: flex;
+	flex-wrap: wrap;
+	gap: 0.35rem;
+}
+
+.component-locations {
+	display: flex;
+	flex-wrap: wrap;
+	gap: 0.35rem;
+}
+
+/* ===== FIELD TAGS ===== */
+
+.field-tag {
+	display: inline-flex;
+	align-items: center;
+	background: var(--surface-raised);
+	border: 1px solid var(--border);
+	border-radius: 3px;
+	font-size: 0.78rem;
+	overflow: hidden;
+}
+
+.tag-name {
+	padding: 0.1rem 0.4rem;
+	color: var(--text-dim);
+	border-right: 1px solid var(--border);
+	font-family: var(--font-mono);
+}
+
+.tag-value {
+	padding: 0.1rem 0.4rem;
+	color: var(--text);
+	font-family: var(--font-mono);
+}
+
+/* ===== LOCATION BADGES ===== */
+
+.location-badge {
+	display: inline-flex;
+	align-items: center;
+	gap: 0.3rem;
+	border-radius: 3px;
+	font-size: 0.8rem;
+	padding: 0.15rem 0.5rem;
+	font-weight: 500;
+}
+
+.location-badge.type-physical {
+	background: var(--badge-physical-bg);
+	color: var(--badge-physical-text);
+}
+
+.location-badge.type-bom {
+	background: var(--badge-bom-bg);
+	color: var(--badge-bom-text);
+}
+
+.location-badge.type-digital {
+	background: var(--badge-digital-bg);
+	color: var(--badge-digital-text);
+}
+
+/* ===== INVENTORY ROWS ===== */
+
+.inventory-row {
+	background: var(--surface);
+	border: 1px solid var(--border);
+	border-radius: 4px;
+	padding: 0.5rem 0.75rem;
+	transition: border-color 0.1s;
+}
+
+.inventory-row:hover {
+	border-color: #3d3d3d;
+}
+
+.inv-type-badge {
+	display: inline-flex;
+}
+
+.type-pill {
+	font-size: 0.75rem;
+	font-weight: 600;
+	padding: 0.1rem 0.5rem;
+	border-radius: 10px;
+	text-transform: uppercase;
+	letter-spacing: 0.04em;
+}
+
+.type-pill.type-physical { background: var(--badge-physical-bg); color: var(--badge-physical-text); }
+.type-pill.type-bom      { background: var(--badge-bom-bg);      color: var(--badge-bom-text); }
+.type-pill.type-digital  { background: var(--badge-digital-bg);  color: var(--badge-digital-text); }
+
+.inv-quantity {
+	font-family: var(--font-mono);
+	font-size: 0.9rem;
+}
+
+.inv-notes {
+	color: var(--text-dim);
+	font-size: 0.85rem;
+	white-space: nowrap;
+	overflow: hidden;
+	text-overflow: ellipsis;
+}
+
+/* ===== FIELD DEF ROWS ===== */
+
+.field-def-row {
+	background: var(--surface);
+	border: 1px solid var(--border);
+	border-radius: 4px;
+	padding: 0.5rem 0.75rem;
+	transition: border-color 0.1s;
+}
+
+.field-def-row:hover {
+	border-color: #3d3d3d;
+}
+
+.fdef-name {
+	font-family: var(--font-mono);
+	font-size: 0.9rem;
+}
+
+.fdef-unit {
+	color: var(--text-dim);
+	font-size: 0.85rem;
+}
+
+.fdef-description {
+	color: var(--text-dim);
+	font-size: 0.85rem;
+}
+
+/* ===== ACTION BUTTONS ===== */
+
+.row-actions {
+	display: flex;
+	align-items: center;
+	gap: 0.25rem;
+}
+
+.btn-icon {
+	background: none;
+	border: 1px solid transparent;
+	color: var(--text-dim);
+	width: 2rem;
+	height: 2rem;
+	border-radius: 4px;
+	cursor: pointer;
+	font-size: 1rem;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	transition: color 0.1s, border-color 0.1s, background 0.1s;
+	font-family: inherit;
+}
+
+.btn-icon:hover {
+	color: var(--text);
+	border-color: var(--border);
+	background: var(--surface-raised);
+}
+
+.btn-icon.btn-danger:hover {
+	color: var(--danger);
+	border-color: var(--danger);
+}
+
+/* ===== BUTTONS ===== */
+
+.btn {
+	border: none;
+	border-radius: 4px;
+	padding: 0.45rem 1rem;
+	cursor: pointer;
+	font-size: 0.9rem;
+	font-family: inherit;
+	font-weight: 500;
+	transition: background 0.1s, color 0.1s;
+	white-space: nowrap;
+}
+
+.btn-primary {
+	background: var(--accent);
+	color: #fff;
+}
+
+.btn-primary:hover {
+	background: var(--accent-hover);
+}
+
+.btn-secondary {
+	background: var(--surface-raised);
+	color: var(--text);
+	border: 1px solid var(--border);
+}
+
+.btn-secondary:hover {
+	background: #333;
+}
+
+.btn-danger {
+	background: var(--danger);
+	color: #fff;
+}
+
+.btn-danger:hover {
+	background: var(--danger-hover);
+}
+
+/* ===== DIALOGS ===== */
+
+.app-dialog {
+	background: var(--surface);
+	color: var(--text);
+	border: 1px solid #3a3a3a;
+	border-radius: 8px;
+	padding: 1.5rem;
+	width: min(500px, 95vw);
+	font-family: inherit;
+}
+
+.app-dialog-sm {
+	width: min(360px, 95vw);
+}
+
+.app-dialog::backdrop {
+	background: rgba(0, 0, 0, 0.65);
+}
+
+.dialog-title {
+	font-size: 1.05rem;
+	font-weight: 600;
+	margin-bottom: 1.25rem;
+	color: var(--text);
+}
+
+.form-row {
+	display: flex;
+	flex-direction: column;
+	gap: 0.3rem;
+	margin-bottom: 0.9rem;
+}
+
+.form-row label {
+	font-size: 0.8rem;
+	text-transform: uppercase;
+	letter-spacing: 0.06em;
+	color: var(--text-dim);
+}
+
+.label-hint {
+	text-transform: none;
+	letter-spacing: normal;
+	font-style: italic;
+	color: var(--text-faint);
+}
+
+.form-row input[type="text"],
+.form-row input[type="search"] {
+	background: var(--bg);
+	border: 1px solid var(--border);
+	color: var(--text);
+	padding: 0.45rem 0.75rem;
+	border-radius: 4px;
+	font-size: 0.9rem;
+	font-family: inherit;
+	transition: border-color 0.1s;
+}
+
+.form-row input:focus {
+	outline: none;
+	border-color: var(--border-focus);
+}
+
+.form-section-label {
+	font-size: 0.75rem;
+	text-transform: uppercase;
+	letter-spacing: 0.07em;
+	color: var(--text-faint);
+	margin-bottom: 0.5rem;
+	margin-top: 0.25rem;
+	border-top: 1px solid var(--border);
+	padding-top: 0.75rem;
+}
+
+/* Field input rows inside component dialog */
+.c-field-input-row {
+	display: grid;
+	grid-template-columns: 1fr 1fr auto;
+	gap: 0.5rem;
+	align-items: center;
+	margin-bottom: 0.5rem;
+}
+
+.c-field-input-label {
+	font-size: 0.85rem;
+	color: var(--text-dim);
+	font-family: var(--font-mono);
+	display: flex;
+	align-items: baseline;
+	gap: 0.3rem;
+}
+
+.c-field-unit-hint {
+	font-size: 0.75rem;
+	color: var(--text-faint);
+}
+
+.c-field-value {
+	background: var(--bg);
+	border: 1px solid var(--border);
+	color: var(--text);
+	padding: 0.35rem 0.6rem;
+	border-radius: 4px;
+	font-size: 0.85rem;
+	font-family: var(--font-mono);
+	transition: border-color 0.1s;
+}
+
+.c-field-value:focus {
+	outline: none;
+	border-color: var(--border-focus);
+}
+
+.add-field-row {
+	margin-top: 0.25rem;
+}
+
+.dialog-actions {
+	display: flex;
+	justify-content: flex-end;
+	gap: 0.5rem;
+	margin-top: 1.25rem;
+	padding-top: 1rem;
+	border-top: 1px solid var(--border);
+}
+
+.confirm-message {
+	color: var(--text-dim);
+	margin-bottom: 0.5rem;
+	font-size: 0.95rem;
+	line-height: 1.5;
+}
diff --git a/public/templates.html b/public/templates.html
new file mode 100644
index 0000000..785dc04
--- /dev/null
+++ b/public/templates.html
@@ -0,0 +1,207 @@
+<!-- ===== COMPONENTS SECTION ===== -->
+<template id="t-section-components">
+	<section class="section" id="section-components">
+		<div class="section-toolbar">
+			<input type="search" id="component-search" class="search-input" placeholder="Search components…">
+			<button class="btn btn-primary" id="btn-add-component">+ Add component</button>
+		</div>
+		<div id="component-list" class="item-list"></div>
+	</section>
+</template>
+
+<template id="t-component-row">
+	<div class="component-row">
+		<div class="component-main">
+			<div class="component-header">
+				<span class="component-name"></span>
+				<span class="component-description"></span>
+			</div>
+			<div class="component-fields"></div>
+			<div class="component-locations"></div>
+		</div>
+		<div class="row-actions">
+			<button class="btn-icon btn-edit" title="Edit">✎</button>
+			<button class="btn-icon btn-danger btn-delete" title="Delete">✕</button>
+		</div>
+	</div>
+</template>
+
+<template id="t-field-tag">
+	<span class="field-tag"><span class="tag-name"></span><span class="tag-value"></span></span>
+</template>
+
+<template id="t-location-badge">
+	<span class="location-badge"><span class="badge-icon"></span><span class="badge-text"></span></span>
+</template>
+
+<!-- ===== INVENTORY SECTION ===== -->
+<template id="t-section-inventory">
+	<section class="section" id="section-inventory">
+		<div class="section-toolbar">
+			<input type="search" id="inventory-search" class="search-input" placeholder="Search by component or location…">
+			<select id="inventory-type-filter" class="filter-select">
+				<option value="">All types</option>
+				<option value="physical">Physical</option>
+				<option value="bom">BOM / Drawing</option>
+				<option value="digital">Digital / Note</option>
+			</select>
+			<button class="btn btn-primary" id="btn-add-inventory">+ Add entry</button>
+		</div>
+		<div class="table-header inventory-grid">
+			<span>Component</span>
+			<span>Type</span>
+			<span>Location / Reference</span>
+			<span>Qty</span>
+			<span>Notes</span>
+			<span></span>
+		</div>
+		<div id="inventory-list" class="item-list"></div>
+	</section>
+</template>
+
+<template id="t-inventory-row">
+	<div class="inventory-row inventory-grid">
+		<span class="inv-component-name"></span>
+		<span class="inv-type-badge"></span>
+		<span class="inv-location-ref"></span>
+		<span class="inv-quantity"></span>
+		<span class="inv-notes"></span>
+		<span class="row-actions">
+			<button class="btn-icon btn-edit" title="Edit">✎</button>
+			<button class="btn-icon btn-danger btn-delete" title="Delete">✕</button>
+		</span>
+	</div>
+</template>
+
+<!-- ===== FIELDS SECTION ===== -->
+<template id="t-section-fields">
+	<section class="section" id="section-fields">
+		<div class="section-toolbar">
+			<span class="section-note">Master field index — fields available for all components</span>
+			<button class="btn btn-primary" id="btn-add-field">+ Add field</button>
+		</div>
+		<div class="table-header fields-grid">
+			<span>Field name</span>
+			<span>Unit</span>
+			<span>Description</span>
+			<span></span>
+		</div>
+		<div id="field-list" class="item-list"></div>
+	</section>
+</template>
+
+<template id="t-field-row">
+	<div class="field-def-row fields-grid">
+		<span class="fdef-name"></span>
+		<span class="fdef-unit"></span>
+		<span class="fdef-description"></span>
+		<span class="row-actions">
+			<button class="btn-icon btn-edit" title="Edit">✎</button>
+			<button class="btn-icon btn-danger btn-delete" title="Delete">✕</button>
+		</span>
+	</div>
+</template>
+
+<!-- ===== DIALOG: COMPONENT ===== -->
+<template id="t-dialog-component">
+	<dialog id="dialog-component" class="app-dialog">
+		<h2 class="dialog-title"></h2>
+		<form method="dialog" id="form-component">
+			<div class="form-row">
+				<label for="c-name">Name</label>
+				<input type="text" id="c-name" required autocomplete="off">
+			</div>
+			<div class="form-row">
+				<label for="c-description">Description</label>
+				<input type="text" id="c-description" autocomplete="off">
+			</div>
+			<div class="form-section-label">Field values</div>
+			<div id="c-field-rows"></div>
+			<div class="form-row add-field-row">
+				<select id="c-add-field-select" class="filter-select">
+					<option value="">— add a field —</option>
+				</select>
+			</div>
+			<div class="dialog-actions">
+				<button type="button" class="btn btn-secondary" id="c-cancel">Cancel</button>
+				<button type="submit" class="btn btn-primary" id="c-save">Save</button>
+			</div>
+		</form>
+	</dialog>
+</template>
+
+<!-- ===== DIALOG: INVENTORY ENTRY ===== -->
+<template id="t-dialog-inventory">
+	<dialog id="dialog-inventory" class="app-dialog">
+		<h2 class="dialog-title"></h2>
+		<form method="dialog" id="form-inventory">
+			<div class="form-row">
+				<label for="i-component">Component</label>
+				<select id="i-component" required class="filter-select wide">
+					<option value="">— select component —</option>
+				</select>
+			</div>
+			<div class="form-row">
+				<label for="i-type">Location type</label>
+				<select id="i-type" required class="filter-select wide">
+					<option value="physical">Physical location</option>
+					<option value="bom">BOM / Drawing</option>
+					<option value="digital">Digital / Note</option>
+				</select>
+			</div>
+			<div class="form-row">
+				<label for="i-ref" id="i-ref-label">Location reference</label>
+				<input type="text" id="i-ref" autocomplete="off">
+			</div>
+			<div class="form-row">
+				<label for="i-qty">Quantity</label>
+				<input type="text" id="i-qty" autocomplete="off" placeholder="e.g. 10, ~50, see BOM">
+			</div>
+			<div class="form-row">
+				<label for="i-notes">Notes</label>
+				<input type="text" id="i-notes" autocomplete="off">
+			</div>
+			<div class="dialog-actions">
+				<button type="button" class="btn btn-secondary" id="i-cancel">Cancel</button>
+				<button type="submit" class="btn btn-primary" id="i-save">Save</button>
+			</div>
+		</form>
+	</dialog>
+</template>
+
+<!-- ===== DIALOG: FIELD DEFINITION ===== -->
+<template id="t-dialog-field">
+	<dialog id="dialog-field" class="app-dialog">
+		<h2 class="dialog-title"></h2>
+		<form method="dialog" id="form-field">
+			<div class="form-row">
+				<label for="f-name">Field name</label>
+				<input type="text" id="f-name" required autocomplete="off" placeholder="e.g. capacitance, mouser_order_no">
+			</div>
+			<div class="form-row">
+				<label for="f-unit">Unit <span class="label-hint">(optional, informational)</span></label>
+				<input type="text" id="f-unit" autocomplete="off" placeholder="e.g. F, V, Ω, mm">
+			</div>
+			<div class="form-row">
+				<label for="f-description">Description</label>
+				<input type="text" id="f-description" autocomplete="off">
+			</div>
+			<div class="dialog-actions">
+				<button type="button" class="btn btn-secondary" id="f-cancel">Cancel</button>
+				<button type="submit" class="btn btn-primary" id="f-save">Save</button>
+			</div>
+		</form>
+	</dialog>
+</template>
+
+<!-- ===== DIALOG: CONFIRM ===== -->
+<template id="t-dialog-confirm">
+	<dialog id="dialog-confirm" class="app-dialog app-dialog-sm">
+		<h2 class="dialog-title">Confirm</h2>
+		<p id="confirm-message" class="confirm-message"></p>
+		<div class="dialog-actions">
+			<button type="button" class="btn btn-secondary" id="confirm-cancel">Cancel</button>
+			<button type="button" class="btn btn-danger" id="confirm-ok">Delete</button>
+		</div>
+	</dialog>
+</template>
diff --git a/server.mjs b/server.mjs
new file mode 100644
index 0000000..ea07491
--- /dev/null
+++ b/server.mjs
@@ -0,0 +1,152 @@
+import express from 'express';
+import { generate_id } from './lib/ids.mjs';
+import {
+	list_fields, get_field, set_field, delete_field,
+	list_components, get_component, set_component, delete_component,
+	list_inventory, get_inventory_entry, set_inventory_entry, delete_inventory_entry,
+} from './lib/storage.mjs';
+
+const app = express();
+app.use(express.json());
+app.use(express.static(new URL('./public/', import.meta.url).pathname));
+
+const PORT = process.env.PORT ?? 3020;
+
+function ok(res, data = {}) { res.json({ ok: true, ...data }); }
+function fail(res, msg, status = 400) { res.status(status).json({ ok: false, error: msg }); }
+
+// ---------------------------------------------------------------------------
+// Field definitions
+// ---------------------------------------------------------------------------
+
+app.get('/api/fields', (req, res) => {
+	ok(res, { fields: list_fields() });
+});
+
+app.post('/api/fields', (req, res) => {
+	const { name, unit = '', description = '' } = req.body;
+	if (!name?.trim()) return fail(res, 'name is required');
+	const field = {
+		id: generate_id(),
+		name: name.trim(),
+		unit: unit.trim(),
+		description: description.trim(),
+		created_at: Date.now(),
+	};
+	set_field(field);
+	ok(res, { field });
+});
+
+app.put('/api/fields/:id', (req, res) => {
+	const existing = get_field(req.params.id);
+	if (!existing) return fail(res, 'not found', 404);
+	const { name, unit, description } = req.body;
+	const updated = { ...existing };
+	if (name !== undefined) updated.name = name.trim();
+	if (unit !== undefined) updated.unit = unit.trim();
+	if (description !== undefined) updated.description = description.trim();
+	set_field(updated);
+	ok(res, { field: updated });
+});
+
+app.delete('/api/fields/:id', (req, res) => {
+	if (!delete_field(req.params.id)) return fail(res, 'not found', 404);
+	ok(res);
+});
+
+// ---------------------------------------------------------------------------
+// Components
+// ---------------------------------------------------------------------------
+
+app.get('/api/components', (req, res) => {
+	ok(res, { components: list_components() });
+});
+
+app.post('/api/components', (req, res) => {
+	const { name, description = '', fields = {} } = req.body;
+	if (!name?.trim()) return fail(res, 'name is required');
+	const now = Date.now();
+	const component = {
+		id: generate_id(),
+		name: name.trim(),
+		description: description.trim(),
+		fields,
+		created_at: now,
+		updated_at: now,
+	};
+	set_component(component);
+	ok(res, { component });
+});
+
+app.get('/api/components/:id', (req, res) => {
+	const component = get_component(req.params.id);
+	if (!component) return fail(res, 'not found', 404);
+	ok(res, { component });
+});
+
+app.put('/api/components/:id', (req, res) => {
+	const existing = get_component(req.params.id);
+	if (!existing) return fail(res, 'not found', 404);
+	const { name, description, fields } = req.body;
+	const updated = { ...existing, updated_at: Date.now() };
+	if (name !== undefined) updated.name = name.trim();
+	if (description !== undefined) updated.description = description.trim();
+	if (fields !== undefined) updated.fields = fields;
+	set_component(updated);
+	ok(res, { component: updated });
+});
+
+app.delete('/api/components/:id', (req, res) => {
+	if (!delete_component(req.params.id)) return fail(res, 'not found', 404);
+	ok(res);
+});
+
+// ---------------------------------------------------------------------------
+// Inventory entries
+// ---------------------------------------------------------------------------
+
+app.get('/api/inventory', (req, res) => {
+	ok(res, { entries: list_inventory() });
+});
+
+app.post('/api/inventory', (req, res) => {
+	const { component_id, location_type, location_ref = '', quantity = '', notes = '' } = req.body;
+	if (!component_id) return fail(res, 'component_id is required');
+	if (!location_type) return fail(res, 'location_type is required');
+	if (!get_component(component_id)) return fail(res, 'component not found', 404);
+	const now = Date.now();
+	const entry = {
+		id: generate_id(),
+		component_id,
+		location_type,
+		location_ref: String(location_ref).trim(),
+		quantity: String(quantity).trim(),
+		notes: String(notes).trim(),
+		created_at: now,
+		updated_at: now,
+	};
+	set_inventory_entry(entry);
+	ok(res, { entry });
+});
+
+app.put('/api/inventory/:id', (req, res) => {
+	const existing = get_inventory_entry(req.params.id);
+	if (!existing) return fail(res, 'not found', 404);
+	const { location_type, location_ref, quantity, notes } = req.body;
+	const updated = { ...existing, updated_at: Date.now() };
+	if (location_type !== undefined) updated.location_type = location_type;
+	if (location_ref !== undefined) updated.location_ref = String(location_ref).trim();
+	if (quantity !== undefined) updated.quantity = String(quantity).trim();
+	if (notes !== undefined) updated.notes = String(notes).trim();
+	set_inventory_entry(updated);
+	ok(res, { entry: updated });
+});
+
+app.delete('/api/inventory/:id', (req, res) => {
+	if (!delete_inventory_entry(req.params.id)) return fail(res, 'not found', 404);
+	ok(res);
+});
+
+app.listen(PORT, () => {
+	console.log(`Electronics Inventory running on http://localhost:${PORT}`);
+});