Remove Django field deprecated_remaining_minutes and delete DB column remaining_minutes

Fix MPP-3448

phones/migrations/0028_remove_relaynumber_deprecated_remaining_minutes.py

@@ -0,0 +1,16 @@
+# Generated by Django 3.2.20 on 2023-09-21 16:16
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("phones", "0027_relaynumber_vendor"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="relaynumber",
+            name="deprecated_remaining_minutes",
+        ),
+    ]

phones/models.py

@@ -233,13 +233,6 @@ class RelayNumber(models.Model):
     remaining_seconds = models.IntegerField(
         default=settings.MAX_MINUTES_PER_BILLING_CYCLE * 60
     )
-    # keep remaining_minutes column until the next deploy
-    deprecated_remaining_minutes = models.IntegerField(
-        db_column="remaining_minutes",
-        null=True,
-        blank=True,
-        default=settings.MAX_MINUTES_PER_BILLING_CYCLE,
-    )
     remaining_texts = models.IntegerField(default=settings.MAX_TEXTS_PER_BILLING_CYCLE)
     calls_forwarded = models.IntegerField(default=0)
     calls_blocked = models.IntegerField(default=0)