diff --git a/ref-test/app/api/views.py b/ref-test/app/api/views.py
index 617951b..1b4c2cd 100644
--- a/ref-test/app/api/views.py
+++ b/ref-test/app/api/views.py
@@ -6,7 +6,6 @@ from ..tools.test import evaluate_answers, generate_questions
 from flask import Blueprint, jsonify, request
 from flask.helpers import abort, flash, url_for
 from flask_login import login_required
-from sqlalchemy.exc import SQLAlchemyError
 
 from datetime import datetime, timedelta
 from json import loads
diff --git a/ref-test/app/editor/views.py b/ref-test/app/editor/views.py
index 0a98452..2e747dd 100644
--- a/ref-test/app/editor/views.py
+++ b/ref-test/app/editor/views.py
@@ -7,7 +7,6 @@ from ..tools.logs import write
 from flask import Blueprint, jsonify, render_template
 from flask.helpers import abort, flash, redirect, request, url_for
 from flask_login import login_required
-from sqlalchemy.exc import SQLAlchemyError
 
 editor = Blueprint(
     name='editor',
diff --git a/ref-test/app/models/dataset.py b/ref-test/app/models/dataset.py
index f6bc977..dc870f5 100644
--- a/ref-test/app/models/dataset.py
+++ b/ref-test/app/models/dataset.py
@@ -5,7 +5,6 @@ from ..tools.logs import write
 from flask import current_app as app
 from flask.helpers import flash
 from flask_login import current_user
-from sqlalchemy.exc import SQLAlchemyError
 from werkzeug.utils import secure_filename
 
 from datetime import datetime
diff --git a/ref-test/app/models/entry.py b/ref-test/app/models/entry.py
index e0cd2c9..b9d07da 100644
--- a/ref-test/app/models/entry.py
+++ b/ref-test/app/models/entry.py
@@ -5,8 +5,6 @@ from .test import Test
 
 from flask_login import current_user
 from flask_mail import Message
-from smtplib import SMTPException
-from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy_json import MutableJson
 
 from datetime import datetime, timedelta
diff --git a/ref-test/app/models/test.py b/ref-test/app/models/test.py
index ad82b62..1bdc160 100644
--- a/ref-test/app/models/test.py
+++ b/ref-test/app/models/test.py
@@ -2,7 +2,6 @@ from ..extensions import db
 from ..tools.logs import write
 
 from flask_login import current_user
-from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy_json import MutableJson
 
 from datetime import date, datetime
diff --git a/ref-test/app/models/user.py b/ref-test/app/models/user.py
index f1b96c3..8101e97 100644
--- a/ref-test/app/models/user.py
+++ b/ref-test/app/models/user.py
@@ -6,8 +6,6 @@ from flask import jsonify, session
 from flask.helpers import flash, url_for
 from flask_login import current_user, login_user, logout_user, UserMixin
 from flask_mail import Message
-from smtplib import SMTPException
-from sqlalchemy.exc import SQLAlchemyError
 from werkzeug.security import check_password_hash, generate_password_hash
 
 import secrets
diff --git a/ref-test/app/quiz/views.py b/ref-test/app/quiz/views.py
index 788abcc..11edaab 100644
--- a/ref-test/app/quiz/views.py
+++ b/ref-test/app/quiz/views.py
@@ -6,7 +6,6 @@ from ..tools.test import redirect_if_started
 
 from flask import Blueprint, jsonify, render_template, request, session
 from flask.helpers import abort, flash, redirect, url_for
-from sqlalchemy.exc import SQLAlchemyError
 
 from datetime import datetime
 
diff --git a/ref-test/app/tools/auth.py b/ref-test/app/tools/auth.py
index f740448..7b1b942 100644
--- a/ref-test/app/tools/auth.py
+++ b/ref-test/app/tools/auth.py
@@ -4,7 +4,6 @@ from ..tools.logs import write
 
 from flask.helpers import abort, flash, redirect, url_for
 from flask_login import current_user
-from sqlalchemy.exc import SQLAlchemyError
 
 from functools import wraps
 
diff --git a/ref-test/app/tools/data.py b/ref-test/app/tools/data.py
index 783e7a3..3621586 100644
--- a/ref-test/app/tools/data.py
+++ b/ref-test/app/tools/data.py
@@ -3,7 +3,6 @@ from ..tools.logs import write
 
 from flask import current_app as app
 from flask.helpers import abort, flash, redirect, url_for
-from sqlalchemy.exc import SQLAlchemyError
 
 import json
 from pathlib import Path