diff --git a/.dockerignore b/.dockerignore
index 80054d0..69951f8 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,8 +1,8 @@
 .git
+.agents
+.codex
 .next
+data
 dist
 node_modules
-data
-*.db
-.env
-.env.*
+npm-debug.log*
diff --git a/Dockerfile b/Dockerfile
index 41a08fd..70e7761 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,14 +1,12 @@
-FROM node:22
+FROM node:22-bookworm-slim
+
 WORKDIR /app
 
-COPY package*.json ./
+ENV NEXT_TELEMETRY_DISABLED=1
+
+COPY package.json package-lock.json ./
 RUN npm ci
 
 COPY . .
-RUN npm run build:api && npm run build:web
 
-RUN mkdir -p data && chmod +x scripts/docker-start.sh
-
-EXPOSE 3001
-
-CMD ["sh", "scripts/docker-start.sh"]
+EXPOSE 3000 3001
diff --git a/scripts/docker-start.sh b/scripts/docker-start.sh
deleted file mode 100644
index bf0d856..0000000
--- a/scripts/docker-start.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-set -e
-
-echo "Running migrations..."
-node scripts/run-migrations.js
-
-echo "Starting API server on :3000..."
-node dist/server/index.js &
-
-echo "Waiting for API..."
-until node -e "require('http').get('http://localhost:3000/health', r => process.exit(r.statusCode===200?0:1)).on('error',()=>process.exit(1))" 2>/dev/null; do
-  sleep 1
-done
-
-echo "Starting Next.js on :3001..."
-exec node_modules/.bin/next start -p 3001
diff --git a/scripts/run-migrations.js b/scripts/run-migrations.js
deleted file mode 100644
index ebbed8a..0000000
--- a/scripts/run-migrations.js
+++ /dev/null
@@ -1,16 +0,0 @@
-const { migrate } = require('drizzle-orm/better-sqlite3/migrator');
-const { drizzle } = require('drizzle-orm/better-sqlite3');
-const Database = require('better-sqlite3');
-const fs = require('node:fs');
-const path = require('node:path');
-
-const dataDir = path.resolve('data');
-if (!fs.existsSync(dataDir)) fs.mkdirSync(dataDir, { recursive: true });
-
-const sqlite = new Database(path.join(dataDir, 'leistungsbilanz.db'));
-const db = drizzle(sqlite);
-
-migrate(db, { migrationsFolder: path.resolve('src/db/migrations') });
-sqlite.close();
-
-console.log('Migrations applied');
diff --git a/src/app/globals.css b/src/app/globals.css
index 22da5df..c73e0f8 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -1396,68 +1396,3 @@ a.kpi:hover {
     max-height: calc(100vh - 5.5rem);
   }
 }
-
-/* ── Seitenleiste: eingeklappter Zustand ─────────────────────────────── */
-
-.app-shell {
-  transition: grid-template-columns 0.18s ease;
-}
-
-.app-shell-collapsed {
-  grid-template-columns: 64px 1fr;
-}
-
-.sidebar {
-  transition: padding 0.18s ease;
-}
-
-.sidebar-brand {
-  display: flex;
-  align-items: flex-start;
-  justify-content: space-between;
-  gap: 8px;
-}
-
-.sidebar-toggle {
-  background: rgba(255, 255, 255, 0.08);
-  border: 0;
-  border-radius: 6px;
-  color: #fff;
-  cursor: pointer;
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  flex-shrink: 0;
-  font-size: 0.8rem;
-  line-height: 1;
-  width: 26px;
-  height: 26px;
-}
-
-.sidebar-toggle:hover {
-  background: rgba(255, 255, 255, 0.18);
-}
-
-.sidebar-collapsed .sidebar-brand {
-  padding: 16px 10px;
-  flex-direction: column;
-  align-items: center;
-}
-
-.sidebar-collapsed .sidebar-brand-text {
-  display: none;
-}
-
-.sidebar-collapsed .sidebar-nav {
-  padding: 12px 8px;
-}
-
-.sidebar-collapsed .sidebar-link {
-  justify-content: center;
-  padding: 10px;
-}
-
-.sidebar-collapsed .sidebar-section-label,
-.sidebar-collapsed .sidebar-label {
-  display: none;
-}
diff --git a/src/app/projects/page.tsx b/src/app/projects/page.tsx
index 21409fd..93a2d14 100644
--- a/src/app/projects/page.tsx
+++ b/src/app/projects/page.tsx
@@ -14,7 +14,6 @@ import type {
   CreateGlobalDeviceInput,
   GlobalDeviceDto,
 } from "../../frontend/types";
-import { GzfPickerModal } from "../../frontend/components/gzf-picker-modal";
 
 const PROJECTS_CHANGED_EVENT = "leistungsbilanz:projects-changed";
 
@@ -68,7 +67,6 @@ export default function ProjectsPage() {
     id: string;
     name: string;
   } | null>(null);
-  const [isGzfPickerOpen, setIsGzfPickerOpen] = useState(false);
 
   async function loadData() {
     setError(null);
@@ -382,28 +380,18 @@ export default function ProjectsPage() {
                 }
               />
             </div>
-            <div className="col-6 col-md-2">
-              <div className="input-group">
-                <input
-                  className="form-control"
-                  type="number"
-                  step="0.01"
-                  min="0"
-                  max="1"
-                  value={globalDeviceForm.demandFactor}
-                  onChange={(event) =>
-                    setGlobalDeviceForm((current) => ({ ...current, demandFactor: event.target.value }))
-                  }
-                />
-                <button
-                  className="btn btn-outline-primary"
-                  onClick={() => setIsGzfPickerOpen(true)}
-                  title="Gleichzeitigkeitsfaktor nach AMEV wählen"
-                  type="button"
-                >
-                  AMEV
-                </button>
-              </div>
+            <div className="col-6 col-md-1">
+              <input
+                className="form-control"
+                type="number"
+                step="0.01"
+                min="0"
+                max="1"
+                value={globalDeviceForm.demandFactor}
+                onChange={(event) =>
+                  setGlobalDeviceForm((current) => ({ ...current, demandFactor: event.target.value }))
+                }
+              />
             </div>
             <div className="col-6 col-md-1">
               <select
@@ -517,16 +505,6 @@ export default function ProjectsPage() {
         </div>
       </section>
       </div>
-
-      {isGzfPickerOpen ? (
-        <GzfPickerModal
-          onClose={() => setIsGzfPickerOpen(false)}
-          onSelect={(value) => {
-            setGlobalDeviceForm((current) => ({ ...current, demandFactor: String(value) }));
-            setIsGzfPickerOpen(false);
-          }}
-        />
-      ) : null}
     </main>
   );
 }
diff --git a/src/frontend/components/AppShell.tsx b/src/frontend/components/AppShell.tsx
index bbfa0ae..ba08175 100644
--- a/src/frontend/components/AppShell.tsx
+++ b/src/frontend/components/AppShell.tsx
@@ -1,36 +1,21 @@
 "use client";
 
-import { useEffect, useState } from "react";
 import { usePathname } from "next/navigation";
 import { Sidebar } from "./Sidebar";
 
 const PROJECT_AREA_PATTERN = /^\/projects(\/[^/]+)?$/;
-const SIDEBAR_COLLAPSED_STORAGE_KEY = "leistungsbilanz:sidebar-collapsed";
 
 export function AppShell({ children }: { children: React.ReactNode }) {
   const pathname = usePathname();
   const showSidebar = PROJECT_AREA_PATTERN.test(pathname ?? "");
-  const [isSidebarCollapsed, setIsSidebarCollapsed] = useState(false);
-
-  useEffect(() => {
-    setIsSidebarCollapsed(window.localStorage.getItem(SIDEBAR_COLLAPSED_STORAGE_KEY) === "1");
-  }, []);
-
-  function toggleSidebarCollapsed() {
-    setIsSidebarCollapsed((current) => {
-      const next = !current;
-      window.localStorage.setItem(SIDEBAR_COLLAPSED_STORAGE_KEY, next ? "1" : "0");
-      return next;
-    });
-  }
 
   if (!showSidebar) {
     return <>{children}</>;
   }
 
   return (
-    <div className={isSidebarCollapsed ? "app-shell app-shell-collapsed" : "app-shell"}>
-      <Sidebar isCollapsed={isSidebarCollapsed} onToggleCollapsed={toggleSidebarCollapsed} />
+    <div className="app-shell">
+      <Sidebar />
       <div className="app-shell-content">{children}</div>
     </div>
   );
diff --git a/src/frontend/components/Sidebar.tsx b/src/frontend/components/Sidebar.tsx
index b3cbb4f..d84141f 100644
--- a/src/frontend/components/Sidebar.tsx
+++ b/src/frontend/components/Sidebar.tsx
@@ -15,12 +15,7 @@ const PROJECT_SECTIONS = [
   { id: "projektgeraete", label: "Projektgeräte", icon: "⚙" },
 ] as const;
 
-interface SidebarProps {
-  isCollapsed: boolean;
-  onToggleCollapsed: () => void;
-}
-
-export function Sidebar({ isCollapsed, onToggleCollapsed }: SidebarProps) {
+export function Sidebar() {
   const pathname = usePathname();
   const projectMatch = pathname?.match(/^\/projects\/([^/]+)$/);
   const activeProjectId = projectMatch ? projectMatch[1] : null;
@@ -72,31 +67,19 @@ export function Sidebar({ isCollapsed, onToggleCollapsed }: SidebarProps) {
   }, [activeProjectId]);
 
   return (
-    <aside className={isCollapsed ? "sidebar sidebar-collapsed" : "sidebar"}>
+    <aside className="sidebar">
       <div className="sidebar-brand">
-        <div className="sidebar-brand-text">
-          <div className="sidebar-wordmark">Leistungsbilanz</div>
-          <div className="sidebar-bar" />
-          <div className="sidebar-tag">Stromkreis- &amp; Lastberechnung</div>
-        </div>
-        <button
-          aria-label={isCollapsed ? "Seitenleiste ausklappen" : "Seitenleiste einklappen"}
-          className="sidebar-toggle"
-          onClick={onToggleCollapsed}
-          title={isCollapsed ? "Seitenleiste ausklappen" : "Seitenleiste einklappen"}
-          type="button"
-        >
-          {isCollapsed ? "»" : "«"}
-        </button>
+        <div className="sidebar-wordmark">Leistungsbilanz</div>
+        <div className="sidebar-bar" />
+        <div className="sidebar-tag">Stromkreis- &amp; Lastberechnung</div>
       </div>
       <nav className="sidebar-nav">
         <Link
           href="/projects"
           className={pathname === "/projects" ? "sidebar-link active" : "sidebar-link"}
-          title="Alle Projekte"
         >
           <span className="sidebar-icon">▦</span>
-          <span className="sidebar-label">Alle Projekte</span>
+          Alle Projekte
         </Link>
 
         <div className="sidebar-section-label">Projekte</div>
@@ -107,10 +90,9 @@ export function Sidebar({ isCollapsed, onToggleCollapsed }: SidebarProps) {
             className={
               project.id === activeProjectId ? "sidebar-link active" : "sidebar-link"
             }
-            title={project.name}
           >
             <span className="sidebar-icon">▣</span>
-            <span className="sidebar-label">{project.name}</span>
+            {project.name}
           </Link>
         ))}
         {!projects.length ? (
@@ -127,10 +109,9 @@ export function Sidebar({ isCollapsed, onToggleCollapsed }: SidebarProps) {
                 key={id}
                 href={`#${id}`}
                 className={activeSection === id ? "sidebar-link active" : "sidebar-link"}
-                title={label}
               >
                 <span className="sidebar-icon">{icon}</span>
-                <span className="sidebar-label">{label}</span>
+                {label}
               </a>
             ))}
           </>
diff --git a/src/frontend/components/gzf-picker-modal.tsx b/src/frontend/components/gzf-picker-modal.tsx
deleted file mode 100644
index 5f118a6..0000000
--- a/src/frontend/components/gzf-picker-modal.tsx
+++ /dev/null
@@ -1,86 +0,0 @@
-"use client";
-
-import { AMEV_GZF_TABLE } from "../../shared/constants/amev-gzf";
-
-interface GzfPickerModalProps {
-  onClose: () => void;
-  onSelect: (value: number) => void;
-}
-
-function formatFactor(value: number) {
-  return value.toLocaleString("de-DE", { minimumFractionDigits: 2, maximumFractionDigits: 2 });
-}
-
-export function GzfPickerModal({ onClose, onSelect }: GzfPickerModalProps) {
-  return (
-    <>
-      <div aria-modal="true" className="modal fade show d-block" role="dialog" tabIndex={-1}>
-        <div className="modal-dialog modal-lg modal-dialog-centered">
-          <div className="modal-content">
-            <div className="modal-header">
-              <div>
-                <h2 className="modal-title fs-5">Gleichzeitigkeitsfaktor nach AMEV</h2>
-                <p className="text-secondary small mb-0">
-                  Tabelle 3 – Gleichzeitigkeitsfaktoren für Verbrauchergruppen
-                </p>
-              </div>
-              <button
-                aria-label="Schließen"
-                className="btn-close"
-                onClick={onClose}
-                type="button"
-              />
-            </div>
-            <div className="modal-body">
-              <div className="table-responsive">
-                <table className="table table-hover align-middle mb-0">
-                  <thead>
-                    <tr>
-                      <th>Verbrauchergruppe</th>
-                      <th>Bereich</th>
-                      <th className="text-end">Mittelwert</th>
-                      <th className="text-end">Gfges</th>
-                      <th className="text-end">Aktion</th>
-                    </tr>
-                  </thead>
-                  <tbody>
-                    {AMEV_GZF_TABLE.map((entry) => (
-                      <tr key={entry.group}>
-                        <td>{entry.group}</td>
-                        <td>{entry.range}</td>
-                        <td className="text-end">{formatFactor(entry.mean)}</td>
-                        <td className="text-end text-secondary small">
-                          {entry.overallRange ?? "–"}
-                        </td>
-                        <td className="text-end">
-                          <button
-                            className="btn btn-sm btn-primary"
-                            onClick={() => onSelect(entry.mean)}
-                            type="button"
-                          >
-                            Übernehmen
-                          </button>
-                        </td>
-                      </tr>
-                    ))}
-                  </tbody>
-                </table>
-              </div>
-              <p className="text-secondary small mt-3 mb-0">
-                Quelle: AMEV „Planungshilfe für elektrische Leistungsbilanzen", Tabelle 3.
-                Übernommen wird jeweils der Mittelwert Gf1 der angegebenen Bandbreite; „Gfges"
-                ist der alternative Gesamtgleichzeitigkeitsfaktor für Verwaltungsgebäude.
-              </p>
-            </div>
-            <div className="modal-footer">
-              <button className="btn btn-outline-secondary" onClick={onClose} type="button">
-                Abbrechen
-              </button>
-            </div>
-          </div>
-        </div>
-      </div>
-      <div className="modal-backdrop fade show" />
-    </>
-  );
-}
diff --git a/src/frontend/components/project-device-modal.tsx b/src/frontend/components/project-device-modal.tsx
index 27c24d0..1707da9 100644
--- a/src/frontend/components/project-device-modal.tsx
+++ b/src/frontend/components/project-device-modal.tsx
@@ -12,7 +12,6 @@ import {
   circuitGroupCategoryLabels,
   type CircuitGroupCategory,
 } from "../../shared/constants/circuit-group";
-import { GzfPickerModal } from "./gzf-picker-modal";
 
 interface ProjectDeviceModalProps {
   globalDevices: GlobalDeviceDto[];
@@ -35,7 +34,6 @@ export function ProjectDeviceModal({
 }: ProjectDeviceModalProps) {
   const [values, setValues] = useState(() => toFormValues(initialDevice, initialValues));
   const [selectedGlobalDeviceId, setSelectedGlobalDeviceId] = useState("");
-  const [isGzfPickerOpen, setIsGzfPickerOpen] = useState(false);
 
   function update(key: keyof typeof values, value: string) {
     setValues((current) => ({ ...current, [key]: value }));
@@ -65,7 +63,6 @@ export function ProjectDeviceModal({
     (!values.cosPhi.trim() || isNumberInRange(values.cosPhi, 0, 1));
 
   return (
-    <>
     <FormModal
       description={
         initialDevice
@@ -170,31 +167,15 @@ export function ProjectDeviceModal({
           step="0.01"
           value={values.powerPerUnit}
         />
-        <div className="col-12 col-md-6">
-          <label className="form-label" htmlFor="device-simultaneity">
-            Gleichzeitigkeitsfaktor
-          </label>
-          <div className="input-group">
-            <input
-              className="form-control"
-              id="device-simultaneity"
-              max="1"
-              min="0"
-              onChange={(event) => update("simultaneityFactor", event.target.value)}
-              step="0.01"
-              type="number"
-              value={values.simultaneityFactor}
-            />
-            <button
-              className="btn btn-outline-primary"
-              onClick={() => setIsGzfPickerOpen(true)}
-              title="Gleichzeitigkeitsfaktor nach AMEV wählen"
-              type="button"
-            >
-              AMEV
-            </button>
-          </div>
-        </div>
+        <NumberField
+          id="device-simultaneity"
+          label="Gleichzeitigkeitsfaktor"
+          max="1"
+          min="0"
+          onChange={(value) => update("simultaneityFactor", value)}
+          step="0.01"
+          value={values.simultaneityFactor}
+        />
         <NumberField
           id="device-cos-phi"
           label="cos Phi"
@@ -218,16 +199,6 @@ export function ProjectDeviceModal({
         </div>
       </div>
     </FormModal>
-    {isGzfPickerOpen ? (
-      <GzfPickerModal
-        onClose={() => setIsGzfPickerOpen(false)}
-        onSelect={(value) => {
-          update("simultaneityFactor", String(value));
-          setIsGzfPickerOpen(false);
-        }}
-      />
-    ) : null}
-    </>
   );
 }
 
diff --git a/src/shared/constants/amev-gzf.ts b/src/shared/constants/amev-gzf.ts
deleted file mode 100644
index 0833091..0000000
--- a/src/shared/constants/amev-gzf.ts
+++ /dev/null
@@ -1,38 +0,0 @@
-export interface AmevGzfEntry {
-  group: string;
-  range: string;
-  mean: number;
-  overallRange?: string;
-}
-
-// Quelle: AMEV „Planungshilfe für elektrische Leistungsbilanzen" (rev. 4),
-// Tabelle 3 – Gleichzeitigkeitsfaktoren für Verbrauchergruppen.
-export const AMEV_GZF_TABLE: AmevGzfEntry[] = [
-  { group: "Absaugung, Digestorien", range: "0,7", mean: 0.7 },
-  { group: "Aufzüge/Rolltreppen", range: "0,2 – 0,7", mean: 0.5, overallRange: "0,2" },
-  { group: "Beleuchtungsanlagen", range: "0,7 – 0,8", mean: 0.75, overallRange: "0,4" },
-  { group: "Beleuchtungsanlagen in innenliegenden Räumen", range: "0,7 – 0,9", mean: 0.8 },
-  { group: "IuK-Anlagen", range: "1", mean: 1, overallRange: "1" },
-  { group: "Experimentieranlagen", range: "0,2 – 0,4", mean: 0.3 },
-  { group: "Heizung", range: "0,7 – 1", mean: 0.85 },
-  { group: "Kälteanlagen", range: "0,8 – 1", mean: 0.9, overallRange: "0,4 – 0,5" },
-  { group: "Küchen elektrisch ohne Energieoptimierung", range: "0,3 – 0,7", mean: 0.6 },
-  { group: "Küchen elektrisch mit Energieoptimierung", range: "0,2 – 0,6", mean: 0.4 },
-  { group: "Lastenaufzüge, Krananlagen", range: "0,2", mean: 0.2 },
-  {
-    group: "Lüftungsanlagen, kontrollierte Lüftung",
-    range: "0,7",
-    mean: 0.7,
-    overallRange: "0,4 – 0,5",
-  },
-  {
-    group: "Steckdosen 230 V allg. Verbraucher (100 W/Steckdose)",
-    range: "0,1 – 0,3",
-    mean: 0.2,
-  },
-  { group: "Steckdosen 230 V für IuK (100 W/Steckdose)", range: "0,7 – 0,9", mean: 0.8 },
-  { group: "Steckdosen 400 V (1000 W/Steckdose)", range: "0,1 – 0,5", mean: 0.35 },
-  { group: "Schmutz-, Warmwasserpumpen", range: "0,2 – 0,4", mean: 0.3 },
-  { group: "Umwälzpumpen", range: "0,6 – 1", mean: 0.8 },
-  { group: "Werkstätten", range: "0,2 – 0,4", mean: 0.3 },
-];