Add properties

dcc/metadata/admin.py

@@ -1,5 +1,6 @@
 from django.contrib import admin
 from metadata.models import (
+    Property,
     Decoder,
     Scale,
     Manufacturer,
@@ -9,6 +10,11 @@ from metadata.models import (
 )
 
 
+@admin.register(Property)
+class PropertyAdmin(admin.ModelAdmin):
+    search_fields = ("name",)
+
+
 @admin.register(Decoder)
 class DecoderAdmin(admin.ModelAdmin):
     readonly_fields = ("image_thumbnail",)

dcc/metadata/migrations/0008_property_alter_manufacturer_options_and_more.py

@@ -0,0 +1,33 @@
+# Generated by Django 4.0.3 on 2022-04-07 09:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('metadata', '0007_alter_manufacturer_category'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Property',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=128, unique=True)),
+            ],
+            options={
+                'verbose_name_plural': 'Properties',
+                'ordering': ['name'],
+            },
+        ),
+        migrations.AlterModelOptions(
+            name='manufacturer',
+            options={'ordering': ['category', 'name']},
+        ),
+        migrations.AlterField(
+            model_name='manufacturer',
+            name='category',
+            field=models.CharField(choices=[('model', 'Model'), ('real', 'Real')], max_length=64),
+        ),
+    ]

dcc/metadata/models.py

@@ -6,6 +6,17 @@ from django_countries.fields import CountryField
 from dcc.utils import get_image_preview, slugify
 
 
+class Property(models.Model):
+    name = models.CharField(max_length=128, unique=True)
+
+    class Meta:
+        verbose_name_plural = "Properties"
+        ordering = ["name"]
+
+    def __str__(self):
+        return self.name
+
+
 class Manufacturer(models.Model):
     name = models.CharField(max_length=128, unique=True)
     category = models.CharField(