feat: add reusable solution library

backend/apps/solutions/migrations/0001_initial.py

@@ -0,0 +1,144 @@
+# Generated by Django 5.2.15 on 2026-06-30 10:43
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    dependencies = [
+        ("tickets", "0001_initial"),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Solution",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True, primary_key=True, serialize=False, verbose_name="ID"
+                    ),
+                ),
+                ("title", models.CharField(max_length=200)),
+                ("problem_signature", models.TextField()),
+                ("related_system", models.CharField(blank=True, max_length=120)),
+                ("environment_scope", models.CharField(blank=True, max_length=120)),
+                ("root_cause", models.TextField()),
+                ("solution", models.TextField()),
+                ("risk_note", models.TextField(blank=True)),
+                ("status", models.CharField(default="draft", max_length=40)),
+                ("usage_count", models.PositiveIntegerField(default=0)),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                (
+                    "category",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        to="tickets.ticketcategory",
+                    ),
+                ),
+                (
+                    "created_by",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+            ],
+            options={
+                "ordering": ["-updated_at"],
+            },
+        ),
+        migrations.CreateModel(
+            name="TicketResolution",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True, primary_key=True, serialize=False, verbose_name="ID"
+                    ),
+                ),
+                ("resolution_type", models.CharField(default="resolved", max_length=80)),
+                ("root_cause", models.TextField(blank=True)),
+                ("solution_text", models.TextField()),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                (
+                    "confirmed_by",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+                (
+                    "linked_solution",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        to="solutions.solution",
+                    ),
+                ),
+                (
+                    "ticket",
+                    models.OneToOneField(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="resolution",
+                        to="tickets.ticket",
+                    ),
+                ),
+            ],
+        ),
+        migrations.CreateModel(
+            name="TicketSolutionLink",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True, primary_key=True, serialize=False, verbose_name="ID"
+                    ),
+                ),
+                ("link_type", models.CharField(default="referenced", max_length=40)),
+                ("agent_run_id", models.BigIntegerField(blank=True, null=True)),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                (
+                    "created_by",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+                (
+                    "solution",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="ticket_links",
+                        to="solutions.solution",
+                    ),
+                ),
+                (
+                    "ticket",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="solution_links",
+                        to="tickets.ticket",
+                    ),
+                ),
+            ],
+            options={
+                "unique_together": {("ticket", "solution", "link_type")},
+            },
+        ),
+    ]

backend/apps/solutions/migrations/__init__.py

@@ -0,0 +1 @@
+