Intervention model refactoring

* adds UserActionLogEntry model to user/models.py
  * wraps user and timestamp info
  * can be extended for more information in the future
* refactors all filtering and accessing on values

user/admin.py

@@ -1,6 +1,6 @@
 from django.contrib import admin
 
-from user.models import UserNotification, KonovaUserExtension
+from user.models import UserNotification, KonovaUserExtension, UserActionLogEntry
 
 
 class UserNotificationAdmin(admin.ModelAdmin):
@@ -17,5 +17,15 @@ class KonovaUserExtensionAdmin(admin.ModelAdmin):
     ]
 
 
+class UserActionLogEntryAdmin(admin.ModelAdmin):
+    list_display = [
+        "id",
+        "user",
+        "timestamp",
+        "action",
+    ]
+
+
 admin.site.register(UserNotification, UserNotificationAdmin)
 admin.site.register(KonovaUserExtension, KonovaUserExtensionAdmin)
+admin.site.register(UserActionLogEntry, UserActionLogEntryAdmin)

user/models.py

@@ -1,6 +1,9 @@
+import uuid
+
 from django.contrib.auth.models import User
 from django.db import models
 
+from konova.enums import UserActionLogEntryEnum
 from user.enums import UserNotificationEnum
 
 
@@ -36,3 +39,27 @@ class KonovaUserExtension(models.Model):
     """
     user = models.OneToOneField(User, on_delete=models.CASCADE)
     notifications = models.ManyToManyField(UserNotification, related_name="+")
+
+
+class UserActionLogEntry(models.Model):
+    """ Wraps a user action log entry
+
+    Can be used for workflow related attributes like checking or recording.
+
+    """
+    id = models.UUIDField(
+        primary_key=True,
+        default=uuid.uuid4,
+    )
+    user = models.ForeignKey(User, related_name='+', on_delete=models.CASCADE, help_text="Performing user")
+    timestamp = models.DateTimeField(auto_now_add=True, help_text="Timestamp of performed action")
+    action = models.CharField(
+        max_length=255,
+        null=True,
+        blank=True,
+        help_text="Short name for performed action - optional",
+        choices=UserActionLogEntryEnum.as_choices(drop_empty_choice=True),
+    )
+
+    def __str__(self):
+        return "{} | {} | {}".format(self.user.username, self.timestamp, self.action)