[Feature] Integrate DOI Links, Handle Cycles in Pathway Viz (#407)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#407

epdb/migrations/0026_auto_20260602_1718.py

@@ -0,0 +1,48 @@
+# Generated by Django 6.0.3 on 2026-06-02 17:18
+
+from django.db import migrations
+from envipy_additional_information import DOI
+
+
+def forward_func(apps, schema_editor):
+    AdditionalInformation = apps.get_model("epdb", "AdditionalInformation")
+
+    refs = AdditionalInformation.objects.filter(type="Reference")
+
+    remaining = []
+
+    for ref in refs:
+        r = ref.data["reference"]
+        try:
+            # PubMed IDs are plain ints, try parsing
+            _ = int(r)
+            # Nothing to do
+        except ValueError:
+            DOMAINS = [
+                "http://dx.doi.org/",
+                "https://dx.doi.org/",
+                "http://doi.org/",
+                "https://doi.org/",
+            ]
+            for d in DOMAINS:
+                r = r.replace(d, "")
+
+            if r.startswith("10."):
+                ref.type = DOI.__name__
+                ref.data = {"doi": r}
+                ref.save()
+            else:
+                remaining.append(ref)
+
+    if len(remaining) > 0:
+        raise ValueError(f"Could not parse {len(remaining)} references")
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("epdb", "0025_auto_20260511_2025"),
+    ]
+
+    operations = [
+        migrations.RunPython(forward_func, reverse_code=migrations.RunPython.noop),
+    ]