fix: migration to add description type based on row type (HL-1046)

backend/benefit/calculator/migrations/0015_desc_type_for_old_calc_rows.py

@@ -0,0 +1,30 @@
+# Generated by Django 3.2.18 on 2023-11-20 17:28
+
+from django.db import migrations
+from calculator.enums import RowType, DescriptionType
+
+
+def add_description_type(apps, _):
+    row_model = apps.get_model("calculator", "CalculationRow")
+    for row in row_model.objects.filter(row_type=RowType.DESCRIPTION):
+        if row.description_type:
+            continue
+        if row.description_fi.startswith("Ajalta"):
+            row.description_type = DescriptionType.DATE
+        elif row.description_fi.startswith("Koko ajalta"):
+            row.description_type = DescriptionType.DATE_TOTAL
+        elif row.description_fi.startswith("Vähennettävät korvaukset"):
+            row.description_type = DescriptionType.DEDUCTION
+        row.save()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("calculator", "0014_add_description_type_to_row"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            add_description_type, reverse_code=migrations.RunPython.noop
+        ),
+    ]