fix / AEB-21 create db schema

backend/sitemanagement/models.py

@@ -34,6 +34,10 @@ class SensorType(models.Model):
     name = models.CharField(max_length=100)
     description = models.TextField(blank=True, null=True)
 
+    # пороговые значения для всех сенсоров этого типа
+    min_value = models.DecimalField(max_digits=12, decimal_places=4, null=True, blank=True)
+    max_value = models.DecimalField(max_digits=12, decimal_places=4, null=True, blank=True)
+
     def __str__(self):
         return self.code
 
@@ -44,7 +48,6 @@ class SignalFormat(models.Model):
     code = models.CharField(max_length=50)  # например "4-20мА", "VW f<1600Hz", "NTC R>250Ohm"
     unit = models.CharField(max_length=20, blank=True, null=True)  # °C, мкм/м, мм и т.п.
     conversion_rule = models.CharField(max_length=255, blank=True, null=True)
-    # можно хранить Python-путь к функции конвертации, например "sensors.convert.ga_current_to_angle"
 
     class Meta:
         unique_together = ("sensor_type", "code")
@@ -81,3 +84,31 @@ class Metric(models.Model):
 
     def __str__(self):
         return f"{self.timestamp} {self.sensor} = {self.value} {self.sensor.signal_format.unit if self.sensor.signal_format else ''}"
+
+
+class Alert(models.Model):
+    """Тревоги по метрикам"""
+    sensor = models.ForeignKey(Sensor, on_delete=models.CASCADE, related_name="alerts")
+    metric = models.ForeignKey(Metric, on_delete=models.CASCADE, related_name="alerts")
+    sensor_type = models.ForeignKey(SensorType, on_delete=models.CASCADE, related_name="alerts")
+    message = models.CharField(max_length=255)
+    severity = models.CharField(
+        max_length=20,
+        choices=[
+            ("warning", "Warning"),
+            ("critical", "Critical"),
+        ],
+        default="warning"
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+    resolved = models.BooleanField(default=False)
+
+    class Meta:
+        indexes = [
+            models.Index(fields=["created_at"]),
+            models.Index(fields=["sensor"]),
+            models.Index(fields=["sensor_type"]),
+        ]
+
+    def __str__(self):
+        return f"ALERT {self.sensor} @ {self.metric.timestamp}: {self.message}"