[Feature] Management Command to Compute and Store Reaction <-> Rule Associations (#453)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#453

epdb/migrations/0029_reactionexplanation_reaction_explained_by.py

@@ -0,0 +1,63 @@
+# Generated by Django 6.0.3 on 2026-08-13 09:58
+
+import django.db.models.deletion
+import django.utils.timezone
+import model_utils.fields
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("epdb", "0028_auto_20260812_0902"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="ReactionExplanation",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True, primary_key=True, serialize=False, verbose_name="ID"
+                    ),
+                ),
+                (
+                    "created",
+                    model_utils.fields.AutoCreatedField(
+                        default=django.utils.timezone.now, editable=False, verbose_name="created"
+                    ),
+                ),
+                (
+                    "modified",
+                    model_utils.fields.AutoLastModifiedField(
+                        default=django.utils.timezone.now, editable=False, verbose_name="modified"
+                    ),
+                ),
+                ("run_uuid", models.UUIDField()),
+                ("run_start", models.DateTimeField()),
+                ("exact", models.BooleanField(default=False)),
+                (
+                    "reaction",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE, to="epdb.reaction"
+                    ),
+                ),
+                (
+                    "rule",
+                    models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to="epdb.rule"),
+                ),
+            ],
+            options={
+                "abstract": False,
+            },
+        ),
+        migrations.AddField(
+            model_name="reaction",
+            name="explained_by",
+            field=models.ManyToManyField(
+                related_name="explained_reactions",
+                through="epdb.ReactionExplanation",
+                to="epdb.rule",
+            ),
+        ),
+    ]