diff --git a/code/backend/nest_backend/__main__.py b/code/backend/nest_backend/__main__.py
index d58ebb5..fb8dd56 100644
--- a/code/backend/nest_backend/__main__.py
+++ b/code/backend/nest_backend/__main__.py
@@ -5,7 +5,7 @@ from flask import Flask
 import os
 import werkzeug.middleware.proxy_fix
 from .routes import *
-from database import Base, tables
+from .database import Base, tables
 import psycopg2
 
 
@@ -19,7 +19,7 @@ app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://postgres:password@localhos
 Base.app = app
 Base.init_app(app)
 # Routes setup
-app.add_url_rule("/doa", view_func=page_doa, methods=["GET"])
+app.add_url_rule("/doa", view_func=page_doa, methods=["GET", "POST"])
 
 if __name__ == "__main__":
     Base.create_all()
diff --git a/code/backend/nest_backend/database/tables/Alert.py b/code/backend/nest_backend/database/tables/Alert.py
index 03f058e..ff9a7a3 100644
--- a/code/backend/nest_backend/database/tables/Alert.py
+++ b/code/backend/nest_backend/database/tables/Alert.py
@@ -15,5 +15,5 @@ class Alert(Base.Model):
     repository_id = Base.Column(Base.Integer, Base.ForeignKey("repository.id"), nullable=False)
     # Relationships
     repository = Base.relationship("Repository", back_populates="alerts")
-    notifications = Base.relationship("Notifications", back_populates="alerts")
+    notifications = Base.relationship("Notification", back_populates="alert")
     operations = Base.relationship("BoolOperation", back_populates="alert")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/BoolOperation.py b/code/backend/nest_backend/database/tables/BoolOperation.py
index 5fca10d..927feae 100644
--- a/code/backend/nest_backend/database/tables/BoolOperation.py
+++ b/code/backend/nest_backend/database/tables/BoolOperation.py
@@ -19,7 +19,7 @@ class BoolOperation(Base.Model):
     # Relationships
     condition = Base.relationship("Condition", back_populates="operations")
     node_1 = Base.relationship("BoolOperation", primaryjoin=("bool_operation.c.node_1_id==bool_operation.c.id"),
-                               remote_side="BoolOperation.id", backref=backref("father", uselist=False))
+                               remote_side="BoolOperation.id", backref=backref("father_1", uselist=False))
     node_2 = Base.relationship("BoolOperation", primaryjoin=("bool_operation.c.node_2_id==bool_operation.c.id"),
-                               remote_side="BoolOperation.id", backref=backref("father", uselist=False))
+                               remote_side="BoolOperation.id", backref=backref("father_2", uselist=False))
     alert = Base.relationship("Alert", back_populates="operations")
diff --git a/code/backend/nest_backend/database/tables/Repository.py b/code/backend/nest_backend/database/tables/Repository.py
index 1a14cfa..27dfe8a 100644
--- a/code/backend/nest_backend/database/tables/Repository.py
+++ b/code/backend/nest_backend/database/tables/Repository.py
@@ -17,4 +17,5 @@ class Repository(Base.Model):
     owner = Base.relationship("User", back_populates="owner_of")
     authorizations = Base.relationship("Authorization", back_populates="repository")
     tweets = Base.relationship("Composed", back_populates="repository")
-    alerts = Base.relationship("Alert", back_populates="repository")
\ No newline at end of file
+    alerts = Base.relationship("Alert", back_populates="repository")
+    uses = Base.relationship("Uses", back_populates="repository")
\ No newline at end of file
diff --git a/code/backend/nest_backend/routes/doa.py b/code/backend/nest_backend/routes/doa.py
index 58ff15f..29c4e6d 100644
--- a/code/backend/nest_backend/routes/doa.py
+++ b/code/backend/nest_backend/routes/doa.py
@@ -2,12 +2,12 @@
 Page that displays a message if the server is on
 """
 
-from flask import render_template, abort
+from flask import render_template, abort, jsonify, request
 from ..database import *
 
 
-
-
 def page_doa():
-    utente = Utente()
+    utente = User()
+    if request.method == "GET":
+        return "Get"
     return "If you see this, the server is fine."