Add research mode to service/history tables

- added as a nullable boolean column.

app/models.py

@@ -95,6 +95,7 @@ class Service(db.Model, Versioned):
         secondary=user_to_service,
         backref=db.backref('user_to_service', lazy='dynamic'))
     restricted = db.Column(db.Boolean, index=False, unique=False, nullable=False)
+    research_mode = db.Column(db.Boolean, index=False, unique=False, nullable=True, default=False)
     email_from = db.Column(db.Text, index=False, unique=True, nullable=False)
     created_by = db.relationship('User')
     created_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=False)