diff --git a/accountant/__init__.py b/accountant/__init__.py
index 6da9cb1..02706a1 100644
--- a/accountant/__init__.py
+++ b/accountant/__init__.py
@@ -22,7 +22,8 @@ from flask_alembic import Alembic
 from flask_alembic.cli.click import cli as alembic_cli
 from flask_restplus import Api
 from flask_cors import CORS
-from flask_sqlalchemy import SQLAlchemy
+
+from .models import db
 
 # The app
 app = Flask(__name__, static_folder=None, template_folder=None)
@@ -34,8 +35,7 @@ app.config['SQLALCHEMY_ECHO'] = app.debug
 app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN'] = True
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
 
-# Database initialization.
-db = SQLAlchemy(app)
+db.init_app(app)
 
 # Database migrations.
 alembic = Alembic(app)
diff --git a/accountant/models/__init__.py b/accountant/models/__init__.py
index 43a4ef3..9a4debc 100644
--- a/accountant/models/__init__.py
+++ b/accountant/models/__init__.py
@@ -16,7 +16,12 @@
 """
 import pkgutil
 
-__all__ = []
+from flask_sqlalchemy import SQLAlchemy
+
+# pylint: disable=invalid-name
+db = SQLAlchemy()
+
+__all__ = ['db']
 
 for loader, module_name, is_pkg in pkgutil.walk_packages(__path__):
     __all__.append(module_name)
diff --git a/accountant/models/accounts.py b/accountant/models/accounts.py
index 1662d81..51aba35 100644
--- a/accountant/models/accounts.py
+++ b/accountant/models/accounts.py
@@ -14,7 +14,8 @@
     You should have received a copy of the GNU Affero General Public License
     along with Accountant.  If not, see <http://www.gnu.org/licenses/>.
 """
-from accountant import db
+# pylint: disable=no-member,too-few-public-methods
+from . import db
 
 from .operations import Operation
 
diff --git a/accountant/models/operations.py b/accountant/models/operations.py
index 15db841..3c3e970 100644
--- a/accountant/models/operations.py
+++ b/accountant/models/operations.py
@@ -18,7 +18,8 @@ from datetime import date
 
 import arrow
 
-from accountant import db
+# pylint: disable=no-member,too-few-public-methods
+from . import db
 
 
 class Operation(db.Model):
diff --git a/accountant/models/scheduled_operations.py b/accountant/models/scheduled_operations.py
index eef1c1c..e760b1a 100644
--- a/accountant/models/scheduled_operations.py
+++ b/accountant/models/scheduled_operations.py
@@ -18,7 +18,8 @@ from calendar import monthrange
 
 import arrow
 
-from accountant import db
+# pylint: disable=no-member,too-few-public-methods,too-many-instance-attributes
+from . import db
 
 from .accounts import Account
 from .operations import Operation
diff --git a/accountant/models/users.py b/accountant/models/users.py
index 244cd22..f720c07 100644
--- a/accountant/models/users.py
+++ b/accountant/models/users.py
@@ -23,7 +23,8 @@ from flask import current_app as app
 
 from flask_login import UserMixin
 
-from accountant import db
+# pylint: disable=no-member,too-few-public-methods
+from . import db
 
 
 class User(UserMixin, db.Model):