diff --git a/src/api/controller/accounts.py b/src/api/controller/accounts.py
index a095b5e..b59d1f4 100644
--- a/src/api/controller/accounts.py
+++ b/src/api/controller/accounts.py
@@ -1,7 +1,6 @@
 
 from app import app
 from app import db
-from app import session
 
 from api.model.accounts import Account
 from api.model.entries import Entry
@@ -15,8 +14,9 @@ def get_accounts():
     """
     Returns accounts with their solds.
     """
+    session = db.create_scoped_session()
 
-    query=session.query(
+    query = session.query(
       Account.id.label("id"),
       Account.name.label("name"),
       func.sum(Entry.value).label("future"),
@@ -34,7 +34,9 @@ def get_accounts():
 
 @app.route("/api/accounts/<account_id>/months")
 def get_months(account_id):
-    query=session.query(
+    session = db.create_scoped_session()
+
+    query = session.query(
       distinct(extract("year", Entry.value_date)).label("year"),
       extract("month", Entry.value_date).label("month")
     ).filter(Entry.account_id == account_id).order_by("year", "month")
@@ -46,46 +48,49 @@ def get_months(account_id):
 
 @app.route("/api/accounts", methods=["PUT"])
 def add_account():
-    with session.begin():
-        try:
-            account = Account(request.json['name'])
+    session = db.create_scoped_session()
 
-            session.add(account)
-            session.commit()
+    try:
+        account = Account(request.json['name'])
 
-            return json.dumps("Account added.")
-        except:
-            session.rollback()
-            raise
+        session.add(account)
+        session.commit()
+
+        return json.dumps("Account added.")
+    except:
+        session.rollback()
+        raise
 
 
 @app.route("/api/accounts/<account_id>", methods=["PUT"])
 def update_account(account_id):
-    with session.begin():
-        try:
-            account = session.query(Account).filter(Account.id == account_id).first()
+    session = db.create_scoped_session()
 
-            account.name = request.json['name']
+    try:
+        account = session.query(Account).filter(Account.id == account_id).first()
 
-            session.merge(account)
-            session.commit()
+        account.name = request.json['name']
 
-            return json.dumps("Account #%s updated." % account_id)
-        except:
-            session.rollback()
-            raise
+        session.merge(account)
+        session.commit()
+
+        return json.dumps("Account #%s updated." % account_id)
+    except:
+        session.rollback()
+        raise
 
 @app.route("/api/accounts/<account_id>", methods=["DELETE"])
 def delete_account(account_id):
-    with session.begin():
-        try:
-            account = session.query(Account).filter(Account.id == account_id).first()
-        
-            session.delete(account)
-            session.commit()
-        
-            return json.dumps("Account #%s deleted." % account_id)
-        except:
-            session.rollback()
-            raise
+    session = db.create_scoped_session()
+
+    try:
+        account = session.query(Account).filter(Account.id == account_id).first()
+    
+        session.delete(account)
+        session.commit()
+    
+        return json.dumps("Account #%s deleted." % account_id)
+    except:
+        session.rollback()
+        raise
 
diff --git a/src/api/controller/entries.py b/src/api/controller/entries.py
index 21ee4eb..5bda88f 100644
--- a/src/api/controller/entries.py
+++ b/src/api/controller/entries.py
@@ -1,6 +1,5 @@
 from app import app
 from app import db
-from app import session
 
 from api.model.entries import Entry
 
@@ -18,7 +17,9 @@ def get_entries(account_id, year, month):
     """
     Return entries for an account, year, and month.
     """
-    query=session.query(
+    session = db.create_scoped_session()
+
+    query = session.query(
       Entry
     ).select_from(
       session.query(Entry)
@@ -45,58 +46,61 @@ def get_entries(account_id, year, month):
 
 @app.route("/api/entries", methods=["PUT"])
 def add_entry():
-    with session.begin():
-        try:
-            entry = Entry(
-              value_date = request.json['value_date'],
-              operation_date = request.json['operation_date'],
-              label = request.json['label'],
-              value = request.json['value'],
-              category = request.json['category'],
-              account_id = request.json['account_id']
-            )
-        
-            session.add(entry)
-            session.commit()
-        
-            return json.dumps("Entry added.")
-        except:
-            session.rollback()
-            raise
+    session = db.create_scoped_session()
+
+    try:
+        entry = Entry(
+          value_date = request.json['value_date'],
+          operation_date = request.json['operation_date'],
+          label = request.json['label'],
+          value = request.json['value'],
+          category = request.json['category'],
+          account_id = request.json['account_id']
+        )
+    
+        session.add(entry)
+        session.commit()
+    
+        return json.dumps("Entry added.")
+    except:
+        session.rollback()
+        raise
 
 @app.route("/api/entries/<entry_id>", methods=["PUT"])
 def update_entry(entry_id):
-    with session.begin():
-        try:
-            entry = session.query(Entry).filter(Entry.id == entry_id).first()
-        
-            entry.id = entry_id
-            entry.value_date = request.json['value_date']
-            entry.operation_date = request.json['operation_date']
-            entry.label = request.json['label']
-            entry.value = request.json['value']
-            entry.category = request.json['category']
-            entry.account_id = request.json['account_id']
-        
-            session.merge(entry)
-            session.commit()
-        
-            return json.dumps("Entry #%s updated." % entry_id)
-        except:
-            session.rollback()
-            raise
+    session = db.create_scoped_session()
+
+    try:
+        entry = session.query(Entry).filter(Entry.id == entry_id).first()
+    
+        entry.id = entry_id
+        entry.value_date = request.json['value_date']
+        entry.operation_date = request.json['operation_date']
+        entry.label = request.json['label']
+        entry.value = request.json['value']
+        entry.category = request.json['category']
+        entry.account_id = request.json['account_id']
+    
+        session.merge(entry)
+        session.commit()
+    
+        return json.dumps("Entry #%s updated." % entry_id)
+    except:
+        session.rollback()
+        raise
 
 @app.route("/api/entries/<entry_id>", methods=["DELETE"])
 def delete_entry(entry_id):
-    with session.begin():
-        try:
-            entry = session.query(Entry).filter(Entry.id == entry_id).first()
-        
-            session.delete(entry)
-            session.commit()
-        
-            return json.dumps("Entry #%s deleted." % entry_id)
-        except:
-            session.rollback()
-            raise
+    session = db.create_scoped_session()
+
+    try:
+        entry = session.query(Entry).filter(Entry.id == entry_id).first()
+    
+        session.delete(entry)
+        session.commit()
+    
+        return json.dumps("Entry #%s deleted." % entry_id)
+    except:
+        session.rollback()
+        raise
 
diff --git a/src/app.py b/src/app.py
index 9290396..74eecd5 100644
--- a/src/app.py
+++ b/src/app.py
@@ -9,5 +9,4 @@ app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://accountant:accountant@loca
 app.config['SQLALCHEMY_RECORD_QUERIES'] = True
 
 db = SQLAlchemy(app)
-session = db.create_scoped_session()