add django backend in /core

ported from laravel in c3lf/lfbackend repo

core/files/migrations/0001_initial.py

@@ -0,0 +1,30 @@
+# Generated by Django 4.2.7 on 2023-11-18 11:28
+
+from django.db import migrations, models
+import django.db.models.deletion
+import files.models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('inventory', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='File',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('created_at', models.DateTimeField(blank=True, null=True)),
+                ('updated_at', models.DateTimeField(blank=True, null=True)),
+                ('deleted_at', models.DateTimeField(blank=True, null=True)),
+                ('file', models.ImageField(upload_to=files.models.hash_upload)),
+                ('mime_type', models.CharField(max_length=255)),
+                ('hash', models.CharField(max_length=64, unique=True)),
+                ('item', models.ForeignKey(blank=True, db_column='iid', null=True, on_delete=django.db.models.deletion.CASCADE, related_name='files', to='inventory.item')),
+            ],
+        ),
+    ]