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/main/dao/services_dao.py

@@ -0,0 +1,38 @@
+from datetime import datetime
+
+from app import db
+from app.models import Service
+
+
+def insert_new_service(service_name, user):
+    service = Service(name=service_name,
+                      created_at=datetime.now(),
+                      limit=1000,
+                      active=False,
+                      restricted=True)
+
+    add_service(service)
+    service.users.append(user)
+    db.session.commit()
+    return service.id
+
+
+def get_service_by_id(id):
+    return Service.query.get(id)
+
+
+def unrestrict_service(service_id):
+    service = get_service_by_id(service_id)
+    service.restricted = False
+    add_service(service)
+
+
+def activate_service(service_id):
+    service = get_service_by_id(service_id)
+    service.active = True
+    add_service(service)
+
+
+def add_service(service):
+    db.session.add(service)
+    db.session.commit()