convert Quoted Printable email subject and body to utf-8

core/mail/migrations/0002_printed_quotable.py

@@ -0,0 +1,32 @@
+# Generated by Django 4.2.7 on 2023-12-09 02:13
+import quopri
+
+from django.db import migrations
+
+from mail.protocol import unescape_and_decode_quoted_printable, unescape_and_decode_base64
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    dependencies = [
+        ('mail', '0001_initial'),
+    ]
+
+    def convert_printed_quotable(apps, schema_editor):
+        Email = apps.get_model('mail', 'Email')
+        for mail in Email.objects.all():
+            mail.body = unescape_and_decode_quoted_printable(mail.body)
+            mail.body = unescape_and_decode_base64(mail.body)
+            mail.subject = unescape_and_decode_quoted_printable(mail.subject)
+            mail.subject = unescape_and_decode_base64(mail.subject)
+            mail.save()
+        IssueThread = apps.get_model('tickets', 'IssueThread')
+        for issue in IssueThread.objects.all():
+            issue.name = unescape_and_decode_quoted_printable(issue.name)
+            issue.name = unescape_and_decode_base64(issue.name)
+            issue.save()
+
+    operations = [
+        migrations.RunPython(convert_printed_quotable),
+    ]