Daten aendern: effective date, searchable UN country pickers, 2 more bugfixes

Feature requests from live use:
- "Daten aendern" was missing a "Wirksam ab" field (unlike Versetzen/
  Befoerdern/Karenz, which all have one) - every change was silently
  logged with today's date. Added the field, threaded through
  change_employee_data (defaults to today if omitted).
- Staatsbuergerschaft and Wohnland now use a searchable picker
  (components/ui/CountryPicker) over the full 193-country UN member
  state list (lib/countries.ts) instead of the original ~9/5-value
  picklists. Dropped the now-too-narrow CHECK constraints
  (supabase/schema_2.sql) since the app is the source of truth for
  valid values, same approach used elsewhere for large open-ended
  pickers.

Two more real bugs found via live testing of the above (both in
change_employee_data, supabase/functions.sql + functions_4.sql):
1. `text[] || 'literal'` is ambiguous in Postgres - it can resolve to
   the array||array overload and try to parse the plain word as array
   syntax ('{...}'), failing with "malformed array literal". Hit on
   every single field-diff line the moment a user actually changed
   something (Staatsbuergerschaft first, then Beschaeftigungsausmass
   confirmed the same root cause). Fixed everywhere by switching to the
   unambiguous array_append() function.
2. The contract_end_date diff-check cast an empty string straight to
   date ("invalid input syntax for type date: ''") instead of using the
   same nullif(...,'')::date guard the UPDATE line below it already had.

Verified live end-to-end after both fixes: changed Staatsbuergerschaft
to Brasilien with a backdated effective date, save succeeded, Stammdaten
tab reflects it, and employee_history got the correct event_date
("2026-07-01") and description ("Geänderte Felder: Staatsbürgerschaft,
wirksam ab 2026-07-01"). Reverted the test employee's data back
afterward; seed data is clean again.

actions/employees.ts

@@ -100,6 +100,7 @@ export async function recordKarenzReturn(payload: {
 
 export async function changeEmployeeData(payload: {
   employee_id: string;
+  effective_date: string;
   person: Record<string, unknown>;
   contract: Record<string, unknown>;
 }): Promise<ActionResult> {

components/employees/panels/DatenAendernPanel.tsx

@@ -3,19 +3,19 @@
 import { useRouter } from "next/navigation";
 import { useState } from "react";
 import { changeEmployeeData } from "@/actions/employees";
+import { CountryPicker } from "@/components/ui/CountryPicker";
 import { SlideOver } from "@/components/ui/SlideOver";
 import { useToast } from "@/components/ui/Toast";
+import { UN_COUNTRIES } from "@/lib/countries";
 import type { ContractType, Database, EmploymentType, GenderType } from "@/lib/supabase/types";
 
 type EmployeeRow = Database["public"]["Views"]["employees_directory"]["Row"];
 
-const NATIONALITIES = ["Österreich", "Deutschland", "Tschechien", "Slowenien", "Türkei", "Serbien", "Kroatien", "Bosnien", "Ungarn", "Andere"];
-const ADDRESS_COUNTRIES = ["Österreich", "Deutschland", "Tschechien", "Slowenien", "Andere"];
-
 export function DatenAendernPanel({ open, onClose, employee }: { open: boolean; onClose: () => void; employee: EmployeeRow }) {
   const { showToast } = useToast();
   const router = useRouter();
   const [pending, setPending] = useState(false);
+  const [effectiveDate, setEffectiveDate] = useState(new Date().toISOString().slice(0, 10));
 
   const [firstName, setFirstName] = useState(employee.first_name);
   const [lastName, setLastName] = useState(employee.last_name);
@@ -47,9 +47,14 @@ export function DatenAendernPanel({ open, onClose, employee }: { open: boolean;
       showToast("Bei befristetem Vertrag ist ein Enddatum erforderlich.", "error");
       return;
     }
+    if (!effectiveDate) {
+      showToast("Bitte ein Wirksam-ab-Datum angeben.", "error");
+      return;
+    }
     setPending(true);
     const result = await changeEmployeeData({
       employee_id: employee.id,
+      effective_date: effectiveDate,
       person: {
         first_name: firstName,
         last_name: lastName,
@@ -101,6 +106,16 @@ export function DatenAendernPanel({ open, onClose, employee }: { open: boolean;
       }
     >
       <div className="flex flex-col gap-6">
+        <div>
+          <label className="mb-1 block text-sm font-semibold text-ink">Wirksam ab*</label>
+          <input
+            type="date"
+            value={effectiveDate}
+            onChange={(e) => setEffectiveDate(e.target.value)}
+            className="w-full rounded border border-border px-3 py-2 text-sm"
+          />
+        </div>
+
         <div>
           <h3 className="mb-3 text-sm font-bold text-ink">Person</h3>
           <div className="flex flex-col gap-3">
@@ -138,13 +153,7 @@ export function DatenAendernPanel({ open, onClose, employee }: { open: boolean;
             </div>
             <div>
               <label className="mb-1 block text-xs font-semibold text-ink-muted">Staatsbürgerschaft</label>
-              <select value={nationality} onChange={(e) => setNationality(e.target.value)} className="w-full rounded border border-border px-3 py-2 text-sm">
-                {NATIONALITIES.map((n) => (
-                  <option key={n} value={n}>
-                    {n}
-                  </option>
-                ))}
-              </select>
+              <CountryPicker value={nationality} onChange={setNationality} countries={UN_COUNTRIES} placeholder="Staatsbürgerschaft suchen…" />
             </div>
             <div className="grid grid-cols-2 gap-3">
               <div>
@@ -153,13 +162,7 @@ export function DatenAendernPanel({ open, onClose, employee }: { open: boolean;
               </div>
               <div>
                 <label className="mb-1 block text-xs font-semibold text-ink-muted">Land</label>
-                <select value={addressCountry} onChange={(e) => setAddressCountry(e.target.value)} className="w-full rounded border border-border px-3 py-2 text-sm">
-                  {ADDRESS_COUNTRIES.map((c) => (
-                    <option key={c} value={c}>
-                      {c}
-                    </option>
-                  ))}
-                </select>
+                <CountryPicker value={addressCountry} onChange={setAddressCountry} countries={UN_COUNTRIES} placeholder="Land suchen…" />
               </div>
             </div>
             <div>

components/ui/CountryPicker.tsx

@@ -0,0 +1,68 @@
+"use client";
+
+import { useEffect, useRef, useState } from "react";
+
+type CountryPickerProps = {
+  value: string;
+  onChange: (value: string) => void;
+  countries: string[];
+  placeholder?: string;
+};
+
+// Searchable text combobox constrained to a fixed list (UN member states)
+// rather than a Lookup-style "selected card" — a country is a single text
+// value, not an object with its own detail fields.
+export function CountryPicker({ value, onChange, countries, placeholder = "Land suchen…" }: CountryPickerProps) {
+  const [query, setQuery] = useState(value);
+  const [open, setOpen] = useState(false);
+  const containerRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => setQuery(value), [value]);
+
+  useEffect(() => {
+    function onClickOutside(e: MouseEvent) {
+      if (containerRef.current && !containerRef.current.contains(e.target as Node)) {
+        setOpen(false);
+        setQuery(value);
+      }
+    }
+    document.addEventListener("mousedown", onClickOutside);
+    return () => document.removeEventListener("mousedown", onClickOutside);
+  }, [value]);
+
+  const filtered = query.trim() ? countries.filter((c) => c.toLowerCase().includes(query.trim().toLowerCase())) : countries;
+
+  return (
+    <div ref={containerRef} className="relative">
+      <input
+        value={query}
+        onChange={(e) => {
+          setQuery(e.target.value);
+          setOpen(true);
+        }}
+        onFocus={() => setOpen(true)}
+        placeholder={placeholder}
+        className="w-full rounded border border-border px-3 py-2 text-sm"
+      />
+      {open && (
+        <div className="absolute z-20 mt-1 max-h-56 w-full overflow-y-auto rounded border border-border bg-white shadow-lg">
+          {filtered.length === 0 && <div className="px-3 py-2 text-sm text-ink-muted">Keine Treffer</div>}
+          {filtered.slice(0, 50).map((c) => (
+            <button
+              key={c}
+              type="button"
+              onClick={() => {
+                onChange(c);
+                setQuery(c);
+                setOpen(false);
+              }}
+              className="block w-full px-3 py-2 text-left text-sm hover:bg-surface"
+            >
+              {c}
+            </button>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}

lib/countries.ts

@@ -0,0 +1,199 @@
+// The 193 UN member states, German names, sorted alphabetically. Used for
+// Staatsbürgerschaft and Wohnland — both are searchable pickers over this
+// same list (see components/ui/Lookup + DatenAendernPanel).
+export const UN_COUNTRIES: string[] = [
+  "Afghanistan",
+  "Ägypten",
+  "Albanien",
+  "Algerien",
+  "Andorra",
+  "Angola",
+  "Antigua und Barbuda",
+  "Äquatorialguinea",
+  "Argentinien",
+  "Armenien",
+  "Aserbaidschan",
+  "Äthiopien",
+  "Australien",
+  "Bahamas",
+  "Bahrain",
+  "Bangladesch",
+  "Barbados",
+  "Belgien",
+  "Belize",
+  "Benin",
+  "Bhutan",
+  "Bolivien",
+  "Bosnien und Herzegowina",
+  "Botsuana",
+  "Brasilien",
+  "Brunei",
+  "Bulgarien",
+  "Burkina Faso",
+  "Burundi",
+  "Chile",
+  "China",
+  "Costa Rica",
+  "Côte d'Ivoire",
+  "Dänemark",
+  "Deutschland",
+  "Dominica",
+  "Dominikanische Republik",
+  "Dschibuti",
+  "Ecuador",
+  "El Salvador",
+  "Eritrea",
+  "Estland",
+  "Eswatini",
+  "Fidschi",
+  "Finnland",
+  "Frankreich",
+  "Gabun",
+  "Gambia",
+  "Georgien",
+  "Ghana",
+  "Grenada",
+  "Griechenland",
+  "Guatemala",
+  "Guinea",
+  "Guinea-Bissau",
+  "Guyana",
+  "Haiti",
+  "Honduras",
+  "Indien",
+  "Indonesien",
+  "Irak",
+  "Iran",
+  "Irland",
+  "Island",
+  "Israel",
+  "Italien",
+  "Jamaika",
+  "Japan",
+  "Jemen",
+  "Jordanien",
+  "Kambodscha",
+  "Kamerun",
+  "Kanada",
+  "Kap Verde",
+  "Kasachstan",
+  "Katar",
+  "Kenia",
+  "Kirgisistan",
+  "Kiribati",
+  "Kolumbien",
+  "Komoren",
+  "Kongo, Demokratische Republik",
+  "Kongo, Republik",
+  "Kosovo",
+  "Kroatien",
+  "Kuba",
+  "Kuwait",
+  "Laos",
+  "Lesotho",
+  "Lettland",
+  "Libanon",
+  "Liberia",
+  "Libyen",
+  "Liechtenstein",
+  "Litauen",
+  "Luxemburg",
+  "Madagaskar",
+  "Malawi",
+  "Malaysia",
+  "Malediven",
+  "Mali",
+  "Malta",
+  "Marokko",
+  "Marshallinseln",
+  "Mauretanien",
+  "Mauritius",
+  "Mexiko",
+  "Mikronesien",
+  "Moldau",
+  "Monaco",
+  "Mongolei",
+  "Montenegro",
+  "Mosambik",
+  "Myanmar",
+  "Namibia",
+  "Nauru",
+  "Nepal",
+  "Neuseeland",
+  "Nicaragua",
+  "Niederlande",
+  "Niger",
+  "Nigeria",
+  "Nordkorea",
+  "Nordmazedonien",
+  "Norwegen",
+  "Oman",
+  "Österreich",
+  "Osttimor",
+  "Pakistan",
+  "Palau",
+  "Panama",
+  "Papua-Neuguinea",
+  "Paraguay",
+  "Peru",
+  "Philippinen",
+  "Polen",
+  "Portugal",
+  "Ruanda",
+  "Rumänien",
+  "Russland",
+  "Salomonen",
+  "Sambia",
+  "Samoa",
+  "San Marino",
+  "São Tomé und Príncipe",
+  "Saudi-Arabien",
+  "Schweden",
+  "Schweiz",
+  "Senegal",
+  "Serbien",
+  "Seychellen",
+  "Sierra Leone",
+  "Simbabwe",
+  "Singapur",
+  "Slowakei",
+  "Slowenien",
+  "Somalia",
+  "Spanien",
+  "Sri Lanka",
+  "St. Kitts und Nevis",
+  "St. Lucia",
+  "St. Vincent und die Grenadinen",
+  "Südafrika",
+  "Sudan",
+  "Südkorea",
+  "Südsudan",
+  "Suriname",
+  "Syrien",
+  "Tadschikistan",
+  "Tansania",
+  "Thailand",
+  "Togo",
+  "Tonga",
+  "Trinidad und Tobago",
+  "Tschad",
+  "Tschechien",
+  "Tunesien",
+  "Türkei",
+  "Turkmenistan",
+  "Tuvalu",
+  "Uganda",
+  "Ukraine",
+  "Ungarn",
+  "Uruguay",
+  "Usbekistan",
+  "Vanuatu",
+  "Venezuela",
+  "Vereinigte Arabische Emirate",
+  "Vereinigte Staaten",
+  "Vereinigtes Königreich",
+  "Vietnam",
+  "Weißrussland",
+  "Zentralafrikanische Republik",
+  "Zypern",
+].sort((a, b) => a.localeCompare(b, "de"));

supabase/functions.sql

@@ -300,6 +300,7 @@ create or replace function change_employee_data(payload jsonb)
 returns void language plpgsql as $$
 declare
   v_employee_id uuid := (payload->>'employee_id')::uuid;
+  v_effective_date date := coalesce(nullif(payload->>'effective_date', '')::date, current_date);
   v_old employees%rowtype;
   v_name text;
   v_person_changes text[] := '{}';
@@ -311,21 +312,21 @@ begin
   select * into v_old from employees where id = v_employee_id;
   v_name := v_old.first_name || ' ' || v_old.last_name;
 
-  if v_person ? 'first_name' and (v_person->>'first_name') <> v_old.first_name then v_person_changes := v_person_changes || 'Vorname'; end if;
-  if v_person ? 'last_name' and (v_person->>'last_name') <> v_old.last_name then v_person_changes := v_person_changes || 'Nachname'; end if;
-  if v_person ? 'gender' and (v_person->>'gender') <> v_old.gender::text then v_person_changes := v_person_changes || 'Geschlecht'; end if;
-  if v_person ? 'birth_date' and (v_person->>'birth_date')::date <> v_old.birth_date then v_person_changes := v_person_changes || 'Geburtsdatum'; end if;
-  if v_person ? 'sv_nummer' and coalesce(v_person->>'sv_nummer','') <> coalesce(v_old.sv_nummer,'') then v_person_changes := v_person_changes || 'SV-Nummer'; end if;
-  if v_person ? 'nationality' and (v_person->>'nationality') <> v_old.nationality then v_person_changes := v_person_changes || 'Staatsbürgerschaft'; end if;
-  if v_person ? 'address' and coalesce(v_person->>'address','') <> coalesce(v_old.address,'') then v_person_changes := v_person_changes || 'Adresse'; end if;
-  if v_person ? 'address_country' and coalesce(v_person->>'address_country','') <> coalesce(v_old.address_country,'') then v_person_changes := v_person_changes || 'Land'; end if;
-  if v_person ? 'email' and (v_person->>'email') <> v_old.email then v_person_changes := v_person_changes || 'E-Mail'; end if;
-  if v_person ? 'phone' and coalesce(v_person->>'phone','') <> coalesce(v_old.phone,'') then v_person_changes := v_person_changes || 'Telefon'; end if;
+  if v_person ? 'first_name' and (v_person->>'first_name') <> v_old.first_name then v_person_changes := array_append(v_person_changes, 'Vorname'); end if;
+  if v_person ? 'last_name' and (v_person->>'last_name') <> v_old.last_name then v_person_changes := array_append(v_person_changes, 'Nachname'); end if;
+  if v_person ? 'gender' and (v_person->>'gender') <> v_old.gender::text then v_person_changes := array_append(v_person_changes, 'Geschlecht'); end if;
+  if v_person ? 'birth_date' and (v_person->>'birth_date')::date <> v_old.birth_date then v_person_changes := array_append(v_person_changes, 'Geburtsdatum'); end if;
+  if v_person ? 'sv_nummer' and coalesce(v_person->>'sv_nummer','') <> coalesce(v_old.sv_nummer,'') then v_person_changes := array_append(v_person_changes, 'SV-Nummer'); end if;
+  if v_person ? 'nationality' and (v_person->>'nationality') <> v_old.nationality then v_person_changes := array_append(v_person_changes, 'Staatsbürgerschaft'); end if;
+  if v_person ? 'address' and coalesce(v_person->>'address','') <> coalesce(v_old.address,'') then v_person_changes := array_append(v_person_changes, 'Adresse'); end if;
+  if v_person ? 'address_country' and coalesce(v_person->>'address_country','') <> coalesce(v_old.address_country,'') then v_person_changes := array_append(v_person_changes, 'Land'); end if;
+  if v_person ? 'email' and (v_person->>'email') <> v_old.email then v_person_changes := array_append(v_person_changes, 'E-Mail'); end if;
+  if v_person ? 'phone' and coalesce(v_person->>'phone','') <> coalesce(v_old.phone,'') then v_person_changes := array_append(v_person_changes, 'Telefon'); end if;
 
-  if v_contract ? 'employment_type' and (v_contract->>'employment_type') <> v_old.employment_type::text then v_contract_changes := v_contract_changes || 'Beschäftigungsausmaß'; end if;
-  if v_contract ? 'weekly_hours' and (v_contract->>'weekly_hours')::numeric <> v_old.weekly_hours then v_contract_changes := v_contract_changes || 'Wochenstunden'; end if;
-  if v_contract ? 'contract_type' and (v_contract->>'contract_type') <> v_old.contract_type::text then v_contract_changes := v_contract_changes || 'Vertragsart'; end if;
-  if v_contract ? 'contract_end_date' and coalesce((v_contract->>'contract_end_date')::date::text,'') <> coalesce(v_old.contract_end_date::text,'') then v_contract_changes := v_contract_changes || 'Befristet bis'; end if;
+  if v_contract ? 'employment_type' and (v_contract->>'employment_type') <> v_old.employment_type::text then v_contract_changes := array_append(v_contract_changes, 'Beschäftigungsausmaß'); end if;
+  if v_contract ? 'weekly_hours' and (v_contract->>'weekly_hours')::numeric <> v_old.weekly_hours then v_contract_changes := array_append(v_contract_changes, 'Wochenstunden'); end if;
+  if v_contract ? 'contract_type' and (v_contract->>'contract_type') <> v_old.contract_type::text then v_contract_changes := array_append(v_contract_changes, 'Vertragsart'); end if;
+  if v_contract ? 'contract_end_date' and coalesce(nullif(v_contract->>'contract_end_date','')::date::text,'') <> coalesce(v_old.contract_end_date::text,'') then v_contract_changes := array_append(v_contract_changes, 'Befristet bis'); end if;
 
   update employees set
     first_name = coalesce(v_person->>'first_name', first_name),
@@ -346,16 +347,16 @@ begin
 
   if array_length(v_person_changes, 1) > 0 then
     insert into employee_history (employee_id, event_date, event_type, description)
-      values (v_employee_id, current_date, 'Stammdatenänderung', 'Geänderte Felder: ' || array_to_string(v_person_changes, ', '));
+      values (v_employee_id, v_effective_date, 'Stammdatenänderung', 'Geänderte Felder: ' || array_to_string(v_person_changes, ', ') || ', wirksam ab ' || v_effective_date);
     insert into audit_log (actor_user_id, actor_name, action, target_label, target_employee_id, details)
-      values (auth.uid(), current_actor_name(), 'Stammdatenänderung', v_name, v_employee_id, array_to_string(v_person_changes, ', '));
+      values (auth.uid(), current_actor_name(), 'Stammdatenänderung', v_name, v_employee_id, array_to_string(v_person_changes, ', ') || ', wirksam ab ' || v_effective_date);
   end if;
 
   if array_length(v_contract_changes, 1) > 0 then
     insert into employee_history (employee_id, event_date, event_type, description)
-      values (v_employee_id, current_date, 'Vertragsänderung', 'Geänderte Felder: ' || array_to_string(v_contract_changes, ', '));
+      values (v_employee_id, v_effective_date, 'Vertragsänderung', 'Geänderte Felder: ' || array_to_string(v_contract_changes, ', ') || ', wirksam ab ' || v_effective_date);
     insert into audit_log (actor_user_id, actor_name, action, target_label, target_employee_id, details)
-      values (auth.uid(), current_actor_name(), 'Vertragsänderung', v_name, v_employee_id, array_to_string(v_contract_changes, ', '));
+      values (auth.uid(), current_actor_name(), 'Vertragsänderung', v_name, v_employee_id, array_to_string(v_contract_changes, ', ') || ', wirksam ab ' || v_effective_date);
   end if;
 end;
 $$;

supabase/functions_4.sql

@@ -0,0 +1,71 @@
+-- Addendum to supabase/functions.sql — run after that file (and functions_2/3.sql).
+--
+-- "Daten ändern" had no "Wirksam ab" field, unlike Versetzung/Beförderung/
+-- Karenz — every change was silently logged with today's date regardless
+-- of when it should actually take effect. Adds an effective_date input
+-- (defaults to today if omitted) used for both the history event_date and
+-- noted in the change description.
+create or replace function change_employee_data(payload jsonb)
+returns void language plpgsql as $$
+declare
+  v_employee_id uuid := (payload->>'employee_id')::uuid;
+  v_effective_date date := coalesce(nullif(payload->>'effective_date', '')::date, current_date);
+  v_old employees%rowtype;
+  v_name text;
+  v_person_changes text[] := '{}';
+  v_contract_changes text[] := '{}';
+  v_person jsonb := payload->'person';
+  v_contract jsonb := payload->'contract';
+begin
+  perform require_hr_admin();
+  select * into v_old from employees where id = v_employee_id;
+  v_name := v_old.first_name || ' ' || v_old.last_name;
+
+  if v_person ? 'first_name' and (v_person->>'first_name') <> v_old.first_name then v_person_changes := array_append(v_person_changes, 'Vorname'); end if;
+  if v_person ? 'last_name' and (v_person->>'last_name') <> v_old.last_name then v_person_changes := array_append(v_person_changes, 'Nachname'); end if;
+  if v_person ? 'gender' and (v_person->>'gender') <> v_old.gender::text then v_person_changes := array_append(v_person_changes, 'Geschlecht'); end if;
+  if v_person ? 'birth_date' and (v_person->>'birth_date')::date <> v_old.birth_date then v_person_changes := array_append(v_person_changes, 'Geburtsdatum'); end if;
+  if v_person ? 'sv_nummer' and coalesce(v_person->>'sv_nummer','') <> coalesce(v_old.sv_nummer,'') then v_person_changes := array_append(v_person_changes, 'SV-Nummer'); end if;
+  if v_person ? 'nationality' and (v_person->>'nationality') <> v_old.nationality then v_person_changes := array_append(v_person_changes, 'Staatsbürgerschaft'); end if;
+  if v_person ? 'address' and coalesce(v_person->>'address','') <> coalesce(v_old.address,'') then v_person_changes := array_append(v_person_changes, 'Adresse'); end if;
+  if v_person ? 'address_country' and coalesce(v_person->>'address_country','') <> coalesce(v_old.address_country,'') then v_person_changes := array_append(v_person_changes, 'Land'); end if;
+  if v_person ? 'email' and (v_person->>'email') <> v_old.email then v_person_changes := array_append(v_person_changes, 'E-Mail'); end if;
+  if v_person ? 'phone' and coalesce(v_person->>'phone','') <> coalesce(v_old.phone,'') then v_person_changes := array_append(v_person_changes, 'Telefon'); end if;
+
+  if v_contract ? 'employment_type' and (v_contract->>'employment_type') <> v_old.employment_type::text then v_contract_changes := array_append(v_contract_changes, 'Beschäftigungsausmaß'); end if;
+  if v_contract ? 'weekly_hours' and (v_contract->>'weekly_hours')::numeric <> v_old.weekly_hours then v_contract_changes := array_append(v_contract_changes, 'Wochenstunden'); end if;
+  if v_contract ? 'contract_type' and (v_contract->>'contract_type') <> v_old.contract_type::text then v_contract_changes := array_append(v_contract_changes, 'Vertragsart'); end if;
+  if v_contract ? 'contract_end_date' and coalesce(nullif(v_contract->>'contract_end_date','')::date::text,'') <> coalesce(v_old.contract_end_date::text,'') then v_contract_changes := array_append(v_contract_changes, 'Befristet bis'); end if;
+
+  update employees set
+    first_name = coalesce(v_person->>'first_name', first_name),
+    last_name = coalesce(v_person->>'last_name', last_name),
+    gender = coalesce((v_person->>'gender')::gender_type, gender),
+    birth_date = coalesce((v_person->>'birth_date')::date, birth_date),
+    sv_nummer = coalesce(v_person->>'sv_nummer', sv_nummer),
+    nationality = coalesce(v_person->>'nationality', nationality),
+    address = coalesce(v_person->>'address', address),
+    address_country = coalesce(v_person->>'address_country', address_country),
+    email = coalesce(v_person->>'email', email),
+    phone = coalesce(v_person->>'phone', phone),
+    employment_type = coalesce((v_contract->>'employment_type')::employment_type, employment_type),
+    weekly_hours = coalesce((v_contract->>'weekly_hours')::numeric, weekly_hours),
+    contract_type = coalesce((v_contract->>'contract_type')::contract_type, contract_type),
+    contract_end_date = case when v_contract ? 'contract_end_date' then nullif(v_contract->>'contract_end_date','')::date else contract_end_date end
+  where id = v_employee_id;
+
+  if array_length(v_person_changes, 1) > 0 then
+    insert into employee_history (employee_id, event_date, event_type, description)
+      values (v_employee_id, v_effective_date, 'Stammdatenänderung', 'Geänderte Felder: ' || array_to_string(v_person_changes, ', ') || ', wirksam ab ' || v_effective_date);
+    insert into audit_log (actor_user_id, actor_name, action, target_label, target_employee_id, details)
+      values (auth.uid(), current_actor_name(), 'Stammdatenänderung', v_name, v_employee_id, array_to_string(v_person_changes, ', ') || ', wirksam ab ' || v_effective_date);
+  end if;
+
+  if array_length(v_contract_changes, 1) > 0 then
+    insert into employee_history (employee_id, event_date, event_type, description)
+      values (v_employee_id, v_effective_date, 'Vertragsänderung', 'Geänderte Felder: ' || array_to_string(v_contract_changes, ', ') || ', wirksam ab ' || v_effective_date);
+    insert into audit_log (actor_user_id, actor_name, action, target_label, target_employee_id, details)
+      values (auth.uid(), current_actor_name(), 'Vertragsänderung', v_name, v_employee_id, array_to_string(v_contract_changes, ', ') || ', wirksam ab ' || v_effective_date);
+  end if;
+end;
+$$;

supabase/schema_2.sql

@@ -0,0 +1,11 @@
+-- Addendum to supabase/schema.sql — run after that file.
+--
+-- Staatsbürgerschaft and Wohnland now use a searchable picker over the
+-- full UN member states list (193 countries, see lib/countries.ts)
+-- instead of the original ~9/5-value picklists. The old CHECK constraints
+-- would reject nearly all of those values, so they're dropped here. The
+-- app is the source of truth for valid values (same approach the rest of
+-- the app already relies on for large open-ended pickers); the columns
+-- stay plain text (nationality keeps its NOT NULL).
+alter table employees drop constraint if exists employees_nationality_check;
+alter table employees drop constraint if exists employees_address_country_check;