Initial commit: KeepItGoing task management server

Features:
- Django-based REST API with web interface
- Task management with tags, priorities, and due dates
- Time tracking with start/stop timers
- Subtasks support
- Task filtering (all, today, upcoming, overdue, completed)
- Tag-based organization with color coding
- Sorting by due date and priority
- Auto-assign tags when filtering
- Responsive 3-pane layout (sidebar, task list, detail panel)
- Task sharing between users
- Mobile-responsive design with dark mode support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

notifications/models.py

@@ -0,0 +1,70 @@
+"""
+Notification models for KeepItGoing.
+"""
+
+import uuid
+from django.conf import settings
+from django.db import models
+
+
+class Notification(models.Model):
+    """
+    Stores notifications for users.
+    """
+    NOTIFICATION_TYPES = [
+        ('reminder', 'Task Reminder'),
+        ('due_soon', 'Due Soon'),
+        ('overdue', 'Overdue'),
+        ('shared', 'Task Shared'),
+        ('comment', 'Comment'),
+    ]
+
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name='notifications'
+    )
+    notification_type = models.CharField(max_length=20, choices=NOTIFICATION_TYPES)
+    title = models.CharField(max_length=255)
+    message = models.TextField()
+    task = models.ForeignKey(
+        'tasks.Task',
+        on_delete=models.CASCADE,
+        null=True,
+        blank=True,
+        related_name='notifications'
+    )
+    is_read = models.BooleanField(default=False)
+    read_at = models.DateTimeField(null=True, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        db_table = 'notifications'
+        ordering = ['-created_at']
+
+    def __str__(self):
+        return f"{self.notification_type}: {self.title}"
+
+
+class ScheduledReminder(models.Model):
+    """
+    Tracks scheduled reminders for tasks.
+    """
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    task = models.ForeignKey(
+        'tasks.Task',
+        on_delete=models.CASCADE,
+        related_name='scheduled_reminders'
+    )
+    remind_at = models.DateTimeField()
+    is_sent = models.BooleanField(default=False)
+    sent_at = models.DateTimeField(null=True, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        db_table = 'scheduled_reminders'
+        ordering = ['remind_at']
+
+    def __str__(self):
+        return f"Reminder for {self.task.title} at {self.remind_at}"