110067722: Create the model and dao for services.

This commit creates the data model for services and user_to_service.
The dao is also created to insert, get, activate, and unrestrict the service.

app/models.py

@@ -78,6 +78,41 @@ class User(db.Model):
                 return True
 
 
+user_to_service = db.Table(
+    'user_to_service',
+    db.Model.metadata,
+    db.Column('user_id', db.Integer, db.ForeignKey('users.id')),
+    db.Column('service_id', db.Integer, db.ForeignKey('services.id'))
+)
+
+
+class Service(db.Model):
+    __tablename__ = 'services'
+
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(255), nullable=False)
+
+    token_id = db.Column(db.BigInteger, index=True, unique=True)
+    created_at = db.Column(db.DateTime, index=False, unique=False, nullable=False)
+    active = db.Column(db.Boolean, index=False, unique=False, nullable=False)
+    limit = db.Column(db.BigInteger, index=False, unique=False, nullable=False)
+    users = db.relationship('User', secondary=user_to_service, backref=db.backref('user_to_service', lazy='dynamic'))
+    restricted = db.Column(db.Boolean, index=False, unique=False, nullable=False)
+
+    def serialize(self):
+        serialized = {
+            'id': self.id,
+            'name': self.name,
+            'createdAt': self.created_at.strftime(DATETIME_FORMAT),
+            'active': self.active,
+            'restricted': self.restricted,
+            'limit': self.limit,
+            'user': self.users.serialize()
+        }
+
+        return filter_null_value_fields(serialized)
+
+
 def filter_null_value_fields(obj):
     return dict(
         filter(lambda x: x[1] is not None, obj.items())