Add data models for lesson documentation.

biscuit/apps/alsijil/models.py

 from django.db import models
 from django.utils.translation import ugettext_lazy as _
+
+from biscuit.chronos.util import current_week
+from biscuit.core.mixins import SchoolRelated
+
+
+class PersonalNote(SchoolRelated):
+    person = models.ForeignKey('core.Person', models.CASCADE)
+
+    week = models.IntegerField()
+    lesson_period = models.ForeignKey('chronos.LessonPeriod', models.CASCADE)
+
+    absent = models.BooleanField(default=False)
+    late = models.IntegerField(default=0)
+    excused = models.BooleanField(default=False)
+
+    remarks = models.CharField(max_length=200, blank=True)
+
+    class Meta:
+        unique_together = [['school', 'lesson_period', 'week', 'person']]
+
+
+class LessonDocumentation(SchoolRelated):
+    week = models.IntegerField()
+    lesson_period = models.ForeigbKey('chronos.LessonPeriod', models.CASCADE)
+
+    topic = models.CharField(verbose_name=_('Lesson topic'), max_length=200)
+    homework = models.CharField(verbose_name=_('Homework'), max_length=200)
+
+    class Meta:
+        unique_together = [['school', 'lesson_period', 'week']]