Add email functionality to AuthService; implement password reset email feature with nodemailer, including transporter initialization and email template for user notifications.

backend/SQL_EXECUTION_ORDER.md

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+# TimeClock v3 - SQL-Scripts Ausführungsreihenfolge
+
+Diese Anleitung zeigt, welche SQL-Scripts in welcher Reihenfolge ausgeführt werden müssen.
+
+## Auf dem Server ausführen:
+
+```bash
+cd /var/www/timeclock/backend
+
+# DB-Credentials aus .env
+DB_HOST=$(grep DB_HOST .env | cut -d= -f2)
+DB_USER=$(grep DB_USER .env | cut -d= -f2)
+DB_PASSWORD=$(grep DB_PASSWORD .env | cut -d= -f2)
+DB_NAME=$(grep DB_NAME .env | cut -d= -f2)
+
+# Alias für einfachere Befehle
+alias dbexec="mysql -h $DB_HOST -u $DB_USER -p'$DB_PASSWORD' $DB_NAME"
+```
+
+## 1. Basis-Schema (WICHTIG - zuerst!)
+
+```bash
+# Erstellt alle Haupt-Tabellen
+dbexec < database-schema.sql
+
+# Zeige erstellte Tabellen
+dbexec -e "SHOW TABLES;"
+```
+
+## 2. Zusätzliche Tabellen
+
+```bash
+# Invitation Table
+dbexec < create-invitation-table.sql
+
+# Watcher Table  
+dbexec < create-watcher-table.sql
+```
+
+## 3. Indices für Performance
+
+```bash
+# Sick Index
+dbexec < add-sick-index.sql
+
+# Vacation Index
+dbexec < add-vacation-index.sql
+```
+
+## 4. Timewish Setup (korrigierte Version!)
+
+```bash
+# Timewish mit Zeiträumen
+dbexec < setup-timewish-complete.sql
+
+# ODER falls noch Fehler: Nur die Spalten hinzufügen
+dbexec << 'EOF'
+-- Prüfe ob start_date existiert
+SET @col_exists = (SELECT COUNT(*) FROM information_schema.COLUMNS 
+                   WHERE TABLE_SCHEMA = DATABASE() 
+                   AND TABLE_NAME = 'timewish' 
+                   AND COLUMN_NAME = 'start_date');
+
+SET @sql = IF(@col_exists = 0, 
+    'ALTER TABLE timewish ADD COLUMN start_date DATE DEFAULT ''2023-01-01'' AFTER end_time;',
+    'SELECT ''start_date existiert bereits'';'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- end_date
+SET @col_exists = (SELECT COUNT(*) FROM information_schema.COLUMNS 
+                   WHERE TABLE_SCHEMA = DATABASE() 
+                   AND TABLE_NAME = 'timewish' 
+                   AND COLUMN_NAME = 'end_date');
+
+SET @sql = IF(@col_exists = 0, 
+    'ALTER TABLE timewish ADD COLUMN end_date DATE DEFAULT NULL AFTER start_date;',
+    'SELECT ''end_date existiert bereits'';'
+);
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+EOF
+```
+
+## 5. Optionale Scripts (nur bei Bedarf!)
+
+### User als Admin setzen
+```bash
+# Passe user_id an! (Deine User-ID aus der users-Tabelle)
+dbexec < set-user-admin.sql
+```
+
+### Timezone-Fixes (nur falls Probleme mit Zeitzonen)
+```bash
+# Worklog Timezone korrigieren
+dbexec < fix-worklog-timezone.sql
+```
+
+### Overtime Offset Update
+```bash
+dbexec < update-overtime-offset.sql
+```
+
+### Wednesday-Fix (nur falls benötigt)
+```bash
+dbexec < add-missing-wednesday.sql
+```
+
+## Überprüfung
+
+```bash
+# Zeige alle Tabellen
+dbexec -e "SHOW TABLES;"
+
+# Zeige timewish-Struktur
+dbexec -e "DESCRIBE timewish;"
+
+# Zeige Anzahl User
+dbexec -e "SELECT COUNT(*) AS user_count FROM users;"
+
+# Zeige deine Timewishes
+dbexec -e "SELECT * FROM timewish WHERE user_id = 1 ORDER BY day, start_date;"
+```
+
+## Nach SQL-Ausführung: Backend neu starten
+
+```bash
+# Backend neu starten damit es die neuen Tabellen/Spalten erkennt
+pm2 restart timeclock-backend
+
+# Logs prüfen
+pm2 logs timeclock-backend --lines 30
+
+# Sollte zeigen:
+# 🕐 TimeClock Server läuft auf Port 3010
+# 📍 API verfügbar unter http://localhost:3010/api
+```
+
+## Schnell-Befehl (alle wichtigen Scripts):
+
+```bash
+cd /var/www/timeclock/backend
+
+# DB-Credentials setzen
+DB_HOST=$(grep DB_HOST .env | cut -d= -f2)
+DB_USER=$(grep DB_USER .env | cut -d= -f2)
+DB_PASSWORD=$(grep DB_PASSWORD .env | cut -d= -f2)
+DB_NAME=$(grep DB_NAME .env | cut -d= -f2)
+
+echo "Führe SQL-Scripts aus..."
+
+# 1. Basis-Schema
+mysql -h $DB_HOST -u $DB_USER -p"$DB_PASSWORD" $DB_NAME < database-schema.sql 2>&1 | grep -v "already exists" || true
+
+# 2. Zusätzliche Tabellen
+mysql -h $DB_HOST -u $DB_USER -p"$DB_PASSWORD" $DB_NAME < create-invitation-table.sql 2>&1 | grep -v "already exists" || true
+mysql -h $DB_HOST -u $DB_USER -p"$DB_PASSWORD" $DB_NAME < create-watcher-table.sql 2>&1 | grep -v "already exists" || true
+
+# 3. Indices
+mysql -h $DB_HOST -u $DB_USER -p"$DB_PASSWORD" $DB_NAME < add-sick-index.sql 2>&1 || true
+mysql -h $DB_HOST -u $DB_USER -p"$DB_PASSWORD" $DB_NAME < add-vacation-index.sql 2>&1 || true
+
+# 4. Timewish (korrigiert)
+mysql -h $DB_HOST -u $DB_USER -p"$DB_PASSWORD" $DB_NAME < setup-timewish-complete.sql
+
+echo "✅ SQL-Scripts ausgeführt!"
+
+# Backend neu starten
+pm2 restart timeclock-backend
+
+echo "✅ Backend neu gestartet!"
+```
+
+Kopiere diesen Schnell-Befehl auf den Server und führe ihn aus! 🚀
+