diff --git a/backend/flask/src/clipperz/models.py b/backend/flask/src/clipperz/models.py
index 9737f37..8de66a1 100644
--- a/backend/flask/src/clipperz/models.py
+++ b/backend/flask/src/clipperz/models.py
@@ -59,9 +59,9 @@ class RecordVersion(db.Model):
     previous_version_key = db.Column(db.String())
     previous_version_id = db.Column(db.Integer(),
                                     db.ForeignKey('record_version.id'))
-    creation_date = db.Column(db.DateTime(), default=datetime.datetime.utcnow)
-    update_date = db.Column(db.DateTime(), default=datetime.datetime.utcnow)
-    access_date = db.Column(db.DateTime(), default=datetime.datetime.utcnow)
+    creation_date = db.Column(db.DateTime())
+    update_date = db.Column(db.DateTime())
+    access_date = db.Column(db.DateTime())
 
     record_id = db.Column(db.Integer(),
                           db.ForeignKey('record.id'),
@@ -72,6 +72,10 @@ class RecordVersion(db.Model):
                                                 order_by=id,
                                                 cascade='all,delete'))
 
+    def __init__(self):
+        """Initialize a record version."""
+        self.creation_date = datetime.datetime.utcnow()
+
     def update(self, someData):
         app.logger.debug(someData)
         recordVersionData = someData['currentRecordVersion']
@@ -93,15 +97,19 @@ class Record(db.Model):
     data = db.Column(db.Text())
     api_version = db.Column(db.String())
     version = db.Column(db.Integer(), default=0)
-    creation_date = db.Column(db.DateTime(), default=datetime.datetime.utcnow)
-    update_date = db.Column(db.DateTime(), default=datetime.datetime.utcnow)
-    access_date = db.Column(db.DateTime(), default=datetime.datetime.utcnow)
+    creation_date = db.Column(db.DateTime())
+    update_date = db.Column(db.DateTime())
+    access_date = db.Column(db.DateTime())
 
     current_record_version = db.relationship(
         'RecordVersion',
         uselist=False,
         cascade='save-update, merge, delete, delete-orphan')
 
+    def __init__(self):
+        """Initialize a record."""
+        self.creation_date = datetime.datetime.utcnow()
+
     def update(self, data, record_version):
         self.reference = data['reference']
         self.data = data['data']
@@ -125,10 +133,14 @@ class OneTimePassword(db.Model):
     key_checksum = db.Column(db.String())
     data = db.Column(db.Text())
     version = db.Column(db.String())
-    creation_date = db.Column(db.DateTime(), default=datetime.datetime.utcnow)
+    creation_date = db.Column(db.DateTime())
     request_date = db.Column(db.DateTime())
     usage_date = db.Column(db.DateTime())
 
+    def __init__(self):
+        """Initialize a OneTimePassword."""
+        self.creation_date = datetime.datetime.utcnow()
+
     def update(self, someParameters, aStatus):
         self.reference = someParameters['reference']
         self.key_value = someParameters['key']
@@ -148,4 +160,8 @@ class OneTimePassword(db.Model):
 class Session(db.Model):
     id = db.Column(db.Integer(), primary_key=True)
     sessionId = db.Column(db.String())
-    access_date = db.Column(db.DateTime(), default=datetime.datetime.utcnow)
+    access_date = db.Column(db.DateTime())
+
+    def __init__(self):
+        """Initialize a session."""
+        self.access_date = datetime.datetime.utcnow()
diff --git a/backend/flask/src/db_create.py b/backend/flask/src/db_create.py
index cd6ce69..2d62abb 100644
--- a/backend/flask/src/db_create.py
+++ b/backend/flask/src/db_create.py
@@ -2,7 +2,7 @@
 from migrate.versioning import api
 from config import SQLALCHEMY_DATABASE_URI
 from config import SQLALCHEMY_MIGRATE_REPO
-from app import db
+from clipperz import db
 import os.path
 db.create_all()
 if not os.path.exists(SQLALCHEMY_MIGRATE_REPO):
diff --git a/backend/flask/src/db_migrate.py b/backend/flask/src/db_migrate.py
index 03f65d1..2eab93d 100644
--- a/backend/flask/src/db_migrate.py
+++ b/backend/flask/src/db_migrate.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 import imp
 from migrate.versioning import api
-from app import db
+from clipperz import db
 from config import SQLALCHEMY_DATABASE_URI
 from config import SQLALCHEMY_MIGRATE_REPO
 v = api.db_version(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
diff --git a/backend/flask/src/db_repository/versions/001_migration.py b/backend/flask/src/db_repository/versions/001_migration.py
new file mode 100644
index 0000000..53f50c9
--- /dev/null
+++ b/backend/flask/src/db_repository/versions/001_migration.py
@@ -0,0 +1,97 @@
+from sqlalchemy import *
+from migrate import *
+
+
+from migrate.changeset import schema
+pre_meta = MetaData()
+post_meta = MetaData()
+one_time_password = Table('one_time_password', post_meta,
+    Column('id', Integer, primary_key=True, nullable=False),
+    Column('user_id', Integer),
+    Column('status', String),
+    Column('reference', String),
+    Column('key_value', String),
+    Column('key_checksum', String),
+    Column('data', Text),
+    Column('version', String),
+    Column('creation_date', DateTime),
+    Column('request_date', DateTime),
+    Column('usage_date', DateTime),
+)
+
+record = Table('record', post_meta,
+    Column('id', Integer, primary_key=True, nullable=False),
+    Column('user_id', Integer),
+    Column('reference', String),
+    Column('data', Text),
+    Column('api_version', String),
+    Column('version', Integer, default=ColumnDefault(0)),
+    Column('creation_date', DateTime),
+    Column('update_date', DateTime),
+    Column('access_date', DateTime),
+)
+
+record_version = Table('record_version', post_meta,
+    Column('id', Integer, primary_key=True, nullable=False),
+    Column('reference', String),
+    Column('header', Text),
+    Column('data', Text),
+    Column('api_version', String),
+    Column('version', Integer),
+    Column('previous_version_key', String),
+    Column('previous_version_id', Integer),
+    Column('creation_date', DateTime),
+    Column('update_date', DateTime),
+    Column('access_date', DateTime),
+    Column('record_id', Integer, nullable=False),
+)
+
+session = Table('session', post_meta,
+    Column('id', Integer, primary_key=True, nullable=False),
+    Column('sessionId', String),
+    Column('access_date', DateTime),
+)
+
+sessions = Table('sessions', post_meta,
+    Column('key', String(length=250), primary_key=True, nullable=False),
+    Column('value', LargeBinary, nullable=False),
+)
+
+user = Table('user', post_meta,
+    Column('id', Integer, primary_key=True, nullable=False),
+    Column('username', String),
+    Column('srp_s', String(length=128)),
+    Column('srp_v', String(length=128)),
+    Column('header', Text),
+    Column('statistics', Text),
+    Column('auth_version', String),
+    Column('version', String),
+    Column('lock', String),
+    Column('offline_saved', Boolean, default=ColumnDefault(False)),
+    Column('update_date', DateTime),
+)
+
+
+def upgrade(migrate_engine):
+    # Upgrade operations go here. Don't create your own engine; bind
+    # migrate_engine to your metadata
+    pre_meta.bind = migrate_engine
+    post_meta.bind = migrate_engine
+    post_meta.tables['one_time_password'].create()
+    post_meta.tables['record'].create()
+    post_meta.tables['record_version'].create()
+    post_meta.tables['session'].create()
+    post_meta.tables['sessions'].create()
+    post_meta.tables['user'].create()
+
+
+def downgrade(migrate_engine):
+    # Operations to reverse the above upgrade go here.
+    pre_meta.bind = migrate_engine
+    post_meta.bind = migrate_engine
+    post_meta.tables['one_time_password'].drop()
+    post_meta.tables['record'].drop()
+    post_meta.tables['record_version'].drop()
+    post_meta.tables['session'].drop()
+    post_meta.tables['sessions'].drop()
+    post_meta.tables['user'].drop()
diff --git a/backend/flask/src/setup.py b/backend/flask/src/setup.py
index affb5e5..f024a18 100644
--- a/backend/flask/src/setup.py
+++ b/backend/flask/src/setup.py
@@ -45,6 +45,7 @@ setup(
     install_requires=['Flask>=0.10.1',
                       'Flask-SQLAlchemy>=1.0',
                       'SQLAlchemy>=0.8.2',
+                      'SQLAlchemy-migrate',
                       'Flask-Login',
                       'Flask-KVSession',
                       ],