django: clean up model permissions and timestamps

Signed-off-by: Jonas Remmert <jremmert@gmx.net>

server/django/sensordata/admin.py

@@ -52,11 +52,10 @@ class EventResourceInline(admin.TabularInline):
 
 @admin.register(Resource)
 class ResourceAdmin(admin.ModelAdmin):
-    list_display = ('endpoint', 'resource_type', 'timestamp')
+    list_display = ('endpoint', 'resource_type', 'timestamp_created')
     search_fields = ('endpoint__endpoint', 'resource_type__name')
-    list_filter = ('endpoint__endpoint', 'resource_type', 'timestamp')
-    readonly_fields = ('endpoint', 'resource_type', 'timestamp', 'int_value',
-                       'float_value', 'str_value')
+    list_filter = ('endpoint__endpoint', 'resource_type', 'timestamp_created')
+    readonly_fields = ('timestamp_created',)
 
 @admin.register(Event)
 class EventAdmin(admin.ModelAdmin):

server/django/sensordata/migrations/0008_alter_resource_unique_together_and_more.py

@@ -0,0 +1,34 @@
+# Generated by Django 5.0.6 on 2024-06-14 13:46
+
+import django.utils.timezone
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("sensordata", "0007_rename_end_time_event_time_remove_event_start_time"),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name="resource",
+            unique_together=set(),
+        ),
+        migrations.AddField(
+            model_name="resource",
+            name="timestamp_created",
+            field=models.DateTimeField(
+                auto_now_add=True, default=django.utils.timezone.now
+            ),
+            preserve_default=False,
+        ),
+        migrations.AlterField(
+            model_name="event",
+            name="time",
+            field=models.DateTimeField(auto_now_add=True),
+        ),
+        migrations.RemoveField(
+            model_name="resource",
+            name="timestamp",
+        ),
+    ]

server/django/sensordata/models.py

@@ -45,13 +45,10 @@ class Resource(models.Model):
     int_value = models.IntegerField(null=True, blank=True)
     float_value = models.FloatField(null=True, blank=True)
     str_value = models.CharField(max_length=512, null=True, blank=True)
-    timestamp = models.DateTimeField()
-
-    class Meta:
-        unique_together = ('endpoint', 'resource_type', 'timestamp')
+    timestamp_created = models.DateTimeField(auto_now_add=True, blank=True)
 
     def __str__(self):
-        return f"{self.endpoint} - {self.resource_type} - {self.timestamp}"
+        return f"{self.endpoint} - {self.resource_type} - {self.timestamp_created}"
 
     # Gets the correct value field, based on the linked ResourceType
     def get_value(self):
@@ -67,7 +64,7 @@ class Event(models.Model):
     """
     endpoint = models.ForeignKey(Endpoint, on_delete=models.PROTECT)
     event_type = models.CharField(max_length=100)
-    time = models.DateTimeField()
+    time = models.DateTimeField(auto_now_add=True, blank=True)
 
     def __str__(self):
         return f"{self.endpoint} - {self.event_type} - {self.time}"
@@ -97,7 +94,7 @@ class Status(models.TextChoices):
         default=Status.QUEUED,
     )
     transmit_counter = models.IntegerField(default=0)
-    timestamp_created = models.DateTimeField(auto_now_add=True)
+    timestamp_created = models.DateTimeField(auto_now_add=True, blank=True)
     last_attempt = models.DateTimeField(auto_now_add=False, null=True)
 
 class Firmware(models.Model):

server/django/sensordata/serializers/base.py

@@ -1,6 +1,5 @@
 from rest_framework import serializers
 from ..models import ResourceType, Resource, Event, EventResource
-from django.utils import timezone
 from ..tasks import process_pending_operations
 import logging
 
@@ -44,7 +43,6 @@ def create_event(self, endpoint, event_type):
         event_data = {
             'endpoint': endpoint,
             'event_type': event_type,
-            'time': timezone.now()
         }
         self.event = Event.objects.create(**event_data)
 
@@ -81,7 +79,6 @@ def handle_resource(self, endpoint, obj_id, res):
         resource_data = {
             'endpoint': endpoint,
             'resource_type': resource_type,
-            'timestamp': timezone.now(),
             data_type: res['value']
         }