diff -r 4c3ae065f22c -r 3b3999550508 src/notes/models/core.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/notes/models/core.py	Thu Jun 08 17:57:57 2017 +0200
@@ -0,0 +1,38 @@
+"""
+irinotes core module
+"""
+from django.conf import settings
+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+
+from .base import Model
+
+
+class Session(Model):
+    class Meta:
+        verbose_name = _('Session')
+        verbose_name_plural = _('Sessions')
+
+    owner = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+    )
+    title = models.TextField(null=True, blank=True, verbose_name=_('Session|title'))
+    description = models.TextField(null=True, blank=True, verbose_name=_('Session|description'))
+    protocol = models.TextField(null=True, blank=True, verbose_name=_('Session|protocol'))
+
+class Note(Model):
+    class Meta:
+        verbose_name = _('Note')
+        verbose_name_plural = _('Notes')
+        ordering = ["tc_start"]
+
+    tc_start = models.DateTimeField(verbose_name=_('Note|tc_start'))
+    tc_end = models.DateTimeField(verbose_name=_('Note|tc_end'))
+    session = models.ForeignKey(Session, on_delete=models.CASCADE, verbose_name=_('Note|session'))
+    text_plain = models.TextField(null=True, blank=True, verbose_name=_('Note|text_plain'))
+    text_html = models.TextField(null=True, blank=True, verbose_name=_('Note|text_html'))
+    text_raw = models.TextField(null=True, blank=True, verbose_name=_('Note|text_raw'))
+    margin_note = models.TextField(null=True, blank=True, verbose_name=_('Note|margin_note'))
+    categorization = models.TextField(null=True, blank=True, verbose_name=_('Note|categorization'))
+