add tasks app

core/apps/tasks/models/__init__.py

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+from .column import *
+from .comment import *
+from .task import *
+from .label import *

core/apps/tasks/models/column.py

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+from django.db import models
+
+from django_core.models import AbstractBaseModel
+
+
+class Column(AbstractBaseModel):
+    name = models.CharField(max_length=255)
+
+    def __str__(self):
+        return self.name

core/apps/tasks/models/comment.py

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+from django.db import models
+
+from django_core.models import AbstractBaseModel
+
+from core.apps.tasks.choices.comment import MessageChoice
+
+
+class Comment(AbstractBaseModel):
+    task = models.ForeignKey('tasks.Task', on_delete=models.CASCADE, related_name='comments')
+    message = models.TextField()
+    file = models.FileField(upload_to='comments/', blank=True, null=True)
+    type = models.CharField(max_length=255, choices=MessageChoice.choices)
+    created_by = models.ForeignKey('accounts.User', on_delete=models.CASCADE, related_name='comments')
+
+    def __str__(self):
+        return f"{self.content} created by {self.created_by}"

core/apps/tasks/models/label.py

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+from django.db import models
+
+from django_core.models import AbstractBaseModel
+
+
+class Label(AbstractBaseModel):
+    name = models.CharField(max_length=255)
+
+    def __str__(self):
+        return self.name

core/apps/tasks/models/task.py

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+from django.db import models
+
+from django_core.models import AbstractBaseModel
+
+from core.apps.tasks.choices.task import PriorityChoice
+
+
+class Task(AbstractBaseModel):
+    column = models.ForeignKey('tasks.Column', on_delete=models.CASCADE, related_name='tasks')
+    name = models.CharField(max_length=255)
+    description = models.TextField(blank=True)
+    priority = models.CharField(max_length=255, choices=PriorityChoice.choices)
+    from_date = models.DateField(null=True, blank=True)
+    to_date = models.DateField(null=True, blank=True)
+    labels = models.ManyToManyField('tasks.Label', related_name='tasks')
+    assignees = models.ManyToManyField('accounts.User', related_name='assigned_tasks')
+    created_by = models.ForeignKey('accounts.User', on_delete=models.CASCADE, related_name='created_tasks')
+
+    def __str__(self):
+        return f"{self.name} created by {self.created_by}"