Add initial Code

app/Models/Contact.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Contact extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'customer_id',
+        'first_name',
+        'last_name',
+        'email',
+        'phone',
+        'position',
+        'is_primary',
+        'avatar',
+    ];
+
+    public function customer()
+    {
+        return $this->belongsTo(Customer::class);
+    }
+
+    /**
+     * Get the URL to the contact's avatar.
+     */
+    public function getAvatarUrlAttribute()
+    {
+        if ($this->avatar) {
+            return asset('storage/' . $this->avatar);
+        }
+
+        // Return null if no avatar is set
+        return null;
+    }
+    
+    /**
+     * Scope a query to order contacts with primary contacts first.
+     */
+    public function scopePrimaryFirst($query)
+    {
+        return $query->orderBy('is_primary', 'desc');
+    }
+}

app/Models/Customer.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Customer extends Model
+{
+    use HasFactory;
+
+    protected $casts = [
+        'billing_address' => 'array'
+    ];
+
+    protected $fillable = [
+        'type',
+        'company_name',
+        'vat_id',
+        'tax_id', // Tax identification number
+        'global_id', // Global Location Number (GLN) or other identification
+        'legal_registration_id', // Legal registration ID
+        'email',
+        'phone',
+        'billing_address',
+        'payment_terms_id',
+        'status',
+        'notes',
+        'logo',
+    ];
+
+    /**
+     * Set the billing address attribute.
+     *
+     * @param  array  $value
+     * @return void
+     */
+    public function setBillingAddressAttribute($value)
+    {
+        if (is_string($value)) {
+            $value = json_decode($value, true);
+        }
+
+        $this->attributes['billing_address'] = json_encode([
+            'line_one' => $value['line_one'] ?? '',
+            'line_two' => $value['line_two'] ?? '',
+            'city' => $value['city'] ?? '',
+            'postal_code' => $value['postal_code'] ?? '',
+            'country_code' => $value['country_code'] ?? 'DE', // Default to Germany
+        ]);
+    }
+
+    /**
+     * Get the billing address attribute.
+     *
+     * @return array
+     */
+    public function getBillingAddressAttribute()
+    {
+        return json_decode($this->attributes['billing_address'], true) ?? [
+            'line_one' => '',
+            'line_two' => '',
+            'city' => '',
+            'postal_code' => '',
+            'country_code' => 'DE',
+        ];
+    }
+
+    /**
+     * Get the URL to the customer's logo.
+     */
+    public function getLogoUrlAttribute()
+    {
+        if ($this->logo) {
+            return asset('storage/' . $this->logo);
+        }
+
+        // Return null if no logo is set
+        return null;
+    }
+
+    /**
+     * Get the contacts for the customer.
+     */
+    public function contacts()
+    {
+        return $this->hasMany(Contact::class);
+    }
+
+    /**
+     * Get the payment term associated with the customer.
+     */
+    public function paymentTerms()
+    {
+        return $this->belongsTo(PaymentTerms::class);
+    }
+}

app/Models/Invoice.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use App\Models\Customer;
+use App\Models\LineItem;
+
+class Invoice extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'nr',
+        'invoice_date',
+        'due_date',
+        'service_start_date',
+        'service_end_date',
+        'is_recurring',
+        'is_partial_service',
+        'customer_id',
+        'billing_data',
+        'payment_status',
+        'total_amount',
+        'title',
+        'text',
+        'items'
+    ];
+
+    protected $casts = [
+        'billing_data' => 'array', // JSON to  Array
+    ];
+
+    public function customer()
+    {
+        return $this->belongsTo(Customer::class);
+    }
+
+    public function items()
+    {
+        return $this->hasMany(LineItem::class);
+    }
+
+    /**
+     * Get the payment term for the invoice.
+     */
+    public function getPaymentTermsAttribute()
+    {
+        return $this->customer->paymentTerms;
+    }
+}

app/Models/LineItem.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+
+class LineItem extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'invoice_id',
+        'position',
+        'title',
+        'description',
+        'quantity',
+        'unit',
+        'price',
+    ];
+
+    public function invoice()
+    {
+        return $this->belongsTo(Invoice::class);
+    }
+}

app/Models/PaymentTerms.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class PaymentTerms extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'name',
+        'description',
+        'is_fixed',
+        'days'
+    ];
+
+    /**
+     * Get the customers that use this payment term.
+     */
+    public function customers()
+    {
+        return $this->hasMany(Customer::class);
+    }
+}

app/Models/Setting.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Setting extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'invoice_number_format',
+        'invoice_number_start',
+    ];
+}

app/Models/User.php

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+<?php
+
+namespace App\Models;
+
+// use Illuminate\Contracts\Auth\MustVerifyEmail;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Laravel\Sanctum\HasApiTokens;
+use Illuminate\Foundation\Auth\User as Authenticatable;
+use Illuminate\Notifications\Notifiable;
+use Laravel\Fortify\TwoFactorAuthenticatable;
+
+class User extends Authenticatable
+{
+    /** @use HasFactory<\Database\Factories\UserFactory> */
+    use HasFactory, HasApiTokens, Notifiable, TwoFactorAuthenticatable;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var list<string>
+     */
+    protected $fillable = [
+        'name',
+        'email',
+        'password',
+        'avatar', // Add avatar field
+    ];
+
+    /**
+     * The attributes that should be hidden for serialization.
+     *
+     * @var list<string>
+     */
+    protected $hidden = [
+        'password',
+        'remember_token',
+    ];
+
+    /**
+     * Get the attributes that should be cast.
+     *
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'email_verified_at' => 'datetime',
+            'password' => 'hashed',
+        ];
+    }
+
+    /**
+     * Get the URL to the user's avatar.
+     */
+    public function getAvatarUrlAttribute()
+    {
+        if ($this->avatar) {
+            return asset('storage/' . $this->avatar);
+        }
+
+        // Return null if no avatar is set
+        return null;
+    }
+}
+