diff --git a/compendium_v2/db/__init__.py b/compendium_v2/db/__init__.py
index 2a07293a14277e62923a2abcbdc449204e661af8..ce48aaa07a269ae2c20235b31c15f58cf8ff0956 100644
--- a/compendium_v2/db/__init__.py
+++ b/compendium_v2/db/__init__.py
@@ -41,5 +41,5 @@ def init_db_model(dsn):
 
     # cf. https://docs.sqlalchemy.org/en
     #        /latest/orm/extensions/automap.html
-    engine = create_engine(dsn, pool_size=10, max_overflow=0)
+    engine = create_engine(dsn, pool_size=10)
     _SESSION_MAKER = sessionmaker(bind=engine)
diff --git a/compendium_v2/db/model.py b/compendium_v2/db/model.py
index 1cc54238c5c108206fbf4edbca2f30f9eef85131..dd67b784703850379f384d4f3ca0845f4622e924 100644
--- a/compendium_v2/db/model.py
+++ b/compendium_v2/db/model.py
@@ -1,4 +1,3 @@
-import enum
 import logging
 import sqlalchemy as sa
 
@@ -13,15 +12,10 @@ logger = logging.getLogger(__name__)
 base_schema: Any = declarative_base()
 
 
-def _enum_names(enum_class):
-    return [x.name for x in list(enum_class)]
-
-
-
-
 class BudgetEntry(base_schema):
     __tablename__ = 'budgets'
-    id = sa.Column(sa.Sequence('budgetentry_seq_id_seq'), nullable=False)
+    id = sa.Column(sa.Integer, sa.Sequence(
+        'budgetentry_seq_id_seq'), nullable=False)
     nren = sa.Column(sa.String(128), primary_key=True)
     budget = sa.Column(sa.String(128), nullable=True)
     year = sa.Column(sa.Integer, primary_key=True)
diff --git a/compendium_v2/migrations/versions/cbcd21fcc151_initial_db.py b/compendium_v2/migrations/versions/cbcd21fcc151_initial_db.py
index 8ff0e48cc2f8f5c0de79a22e16aea14d46b71369..1e4e62a5e0e30a085d4ac46fb8998dda7746ac29 100644
--- a/compendium_v2/migrations/versions/cbcd21fcc151_initial_db.py
+++ b/compendium_v2/migrations/versions/cbcd21fcc151_initial_db.py
@@ -1,7 +1,7 @@
 """Initial DB
 
 Revision ID: cbcd21fcc151
-Revises: 
+Revises:
 Create Date: 2023-02-07 15:56:22.086064
 
 """
@@ -15,22 +15,24 @@ down_revision = None
 branch_labels = None
 depends_on = None
 
-budget_id_seq = sa.Sequence('budgetentry_seq_id_seq') # represents the sequence
-
+# represents the sequence
+budget_id_seq = sa.Sequence('budgetentry_seq_id_seq')
 
 
 def upgrade():
-    op.execute(sa.schema.CreateSequence(budget_id_seq)) # create the sequence
-    op.create_table('budgets',
-    sa.Column('id', sa.Integer, budget_id_seq, nullable=False, server_default=budget_id_seq.next_value()),
-    sa.Column('nren', sa.String(length=128), nullable=False),
-    sa.Column('budget', sa.String(length=128), nullable=True),
-    sa.Column('year', sa.Integer, nullable=False),
-    sa.PrimaryKeyConstraint('nren', 'year')
+    op.execute(sa.schema.CreateSequence(budget_id_seq))  # create the sequence
+    op.create_table(
+        'budgets',
+        sa.Column('id', sa.Integer, budget_id_seq, nullable=False,
+                  server_default=budget_id_seq.next_value()),
+        sa.Column('nren', sa.String(length=128), nullable=False),
+        sa.Column('budget', sa.String(length=128), nullable=True),
+        sa.Column('year', sa.Integer, nullable=False),
+        sa.PrimaryKeyConstraint('nren', 'year')
     )
 
 
 def downgrade():
     op.execute(
-      sa.schema.DropSequence(sa.Sequence('budgetentry_seq_id_seq')))
+        sa.schema.DropSequence(sa.Sequence('budgetentry_seq_id_seq')))
     op.drop_table('budgets')
diff --git a/compendium_v2/routes/budget.py b/compendium_v2/routes/budget.py
index 7c5090ade591a0eb77736d5226bac9b8208d94bb..a0b37a2d223ceaedba9d04dce959a06aec707816 100644
--- a/compendium_v2/routes/budget.py
+++ b/compendium_v2/routes/budget.py
@@ -63,19 +63,16 @@ def budget_view() -> Any:
     :return:
     """
 
-   
-
     with survey_db.session_scope() as survey_session, \
             db.session_scope() as session:
-        
+
         _entries = session.query(model.BudgetEntry)
 
         inserted = defaultdict(dict)
 
-
         for entry in _entries:
             inserted[entry.nren][entry.year] = entry.budget
-        
+
         data = survey_session.query(survey_model.Nrens)
         for nren in data:
             for budget in nren.budgets:
@@ -100,6 +97,7 @@ def budget_view() -> Any:
 
     with db.session_scope() as session:
         entries = sorted([_extract_data(entry)
-                   for entry in session.query(model.BudgetEntry)], key=lambda d: (d['BUDGET_YEAR'], d['NREN']))
+                          for entry in session.query(model.BudgetEntry)],
+                         key=lambda d: (d['BUDGET_YEAR'], d['NREN']))
 
     return jsonify(entries)
diff --git a/compendium_v2/survey_db/__init__.py b/compendium_v2/survey_db/__init__.py
index 2a07293a14277e62923a2abcbdc449204e661af8..ce48aaa07a269ae2c20235b31c15f58cf8ff0956 100644
--- a/compendium_v2/survey_db/__init__.py
+++ b/compendium_v2/survey_db/__init__.py
@@ -41,5 +41,5 @@ def init_db_model(dsn):
 
     # cf. https://docs.sqlalchemy.org/en
     #        /latest/orm/extensions/automap.html
-    engine = create_engine(dsn, pool_size=10, max_overflow=0)
+    engine = create_engine(dsn, pool_size=10)
     _SESSION_MAKER = sessionmaker(bind=engine)
diff --git a/compendium_v2/survey_db/model.py b/compendium_v2/survey_db/model.py
index ef05e057c0c3f60480fe92bf3832d87bc69ced70..4ea5af32f0336baa6787e6efbfb432cda321b86c 100644
--- a/compendium_v2/survey_db/model.py
+++ b/compendium_v2/survey_db/model.py
@@ -1,4 +1,3 @@
-import enum
 import logging
 import sqlalchemy as sa
 
@@ -13,10 +12,6 @@ logger = logging.getLogger(__name__)
 base_schema: Any = declarative_base()
 
 
-def _enum_names(enum_class):
-    return [x.name for x in list(enum_class)]
-
-
 class Budgets(base_schema):
     __tablename__ = 'budgets'
     id = sa.Column(sa.Integer, primary_key=True)
diff --git a/test/conftest.py b/test/conftest.py
index bd3d6628443fea86d435e26f3964d5cd32f3cfef..2670344426770602a0f4501433b1c71f31a5a358 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -6,6 +6,7 @@ import pytest
 import compendium_v2
 from compendium_v2 import db
 from compendium_v2.db import model
+from compendium_v2.survey_db import model as survey_model
 
 from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
@@ -16,9 +17,26 @@ from sqlalchemy.pool import StaticPool
 def dummy_config():
     yield {
         'SQLALCHEMY_DATABASE_URI': 'sqlite://',
+        'SURVEY_DATABASE_URI': 'sqlite:///'
     }
 
 
+@pytest.fixture
+def mocked_survey_db(mocker):
+    engine = create_engine(
+        'sqlite://',
+        connect_args={'check_same_thread': False},
+        poolclass=StaticPool,
+        echo=False)
+    survey_model.base_schema.metadata.create_all(engine)
+    mocker.patch(
+        'compendium_v2.survey_db._SESSION_MAKER',
+        sessionmaker(bind=engine))
+    mocker.patch(
+        'compendium_v2.survey_db.init_db_model',
+        lambda dsn: None)
+
+
 @pytest.fixture
 def mocked_db(mocker):
     # cf. https://stackoverflow.com/a/33057675
@@ -59,7 +77,7 @@ def data_config_filename(dummy_config):
 
 
 @pytest.fixture
-def client(data_config_filename, mocked_db):
+def client(data_config_filename, mocked_db, mocked_survey_db):
     os.environ['SETTINGS_FILENAME'] = data_config_filename
     with compendium_v2.create_app().test_client() as c:
         yield c