Add SessionTimer model

temba/flows/migrations/0338_sessiontimer.py

@@ -0,0 +1,35 @@
+# Generated by Django 5.1.2 on 2024-11-20 15:09
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("flows", "0337_alter_flowstart_status"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="SessionTimer",
+            fields=[
+                ("id", models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("type", models.CharField(choices=[("T", "Timeout"), ("E", "Expiration")], max_length=1)),
+                ("time", models.DateTimeField()),
+                (
+                    "session",
+                    models.ForeignKey(
+                        db_index=False,
+                        on_delete=django.db.models.deletion.PROTECT,
+                        related_name="timers",
+                        to="flows.flowsession",
+                    ),
+                ),
+            ],
+            options={
+                "indexes": [models.Index(fields=["time"], name="flows_sessi_time_c44534_idx")],
+                "constraints": [models.UniqueConstraint(fields=("session", "type"), name="session_timer_unique")],
+            },
+        ),
+    ]

temba/flows/models.py

@@ -1067,6 +1067,26 @@ class Meta:
         ]
 
 
+class SessionTimer(models.Model):
+    """
+    A scheduled timed event for a session
+    """
+
+    TYPE_TIMEOUT = "T"
+    TYPE_EXPIRATION = "E"
+    TYPE_CHOICES = ((TYPE_TIMEOUT, "Timeout"), (TYPE_EXPIRATION, "Expiration"))
+
+    session = models.ForeignKey(FlowSession, on_delete=models.PROTECT, related_name="timers", db_index=False)
+    type = models.CharField(max_length=1, choices=TYPE_CHOICES)
+    time = models.DateTimeField()
+
+    class Meta:
+        indexes = [models.Index(fields=["time"])]
+        constraints = [
+            models.UniqueConstraint(fields=("session", "type"), name="session_timer_unique"),
+        ]
+
+
 class FlowRun(models.Model):
     """
     A single contact's journey through a flow. It records the path taken, results collected etc.