Les urls d'import récurrent sont uniques

See #321

src/agenda_culturel/migrations/0148_alter_recurrentimport_source.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.9 on 2025-02-20 22:42
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('agenda_culturel', '0147_alter_recurrentimport_processor'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='recurrentimport',
+            name='source',
+            field=models.URLField(help_text='URL of the source document', max_length=1024, unique=True, verbose_name='Source'),
+        ),
+    ]

src/agenda_culturel/models.py

@@ -2204,6 +2204,7 @@ class RecurrentImport(models.Model):
     source = models.URLField(
         verbose_name=_("Source"),
         help_text=_("URL of the source document"),
+        unique=True,
         max_length=1024,
     )
     browsable_url = models.URLField(