diff --git a/requirements.txt b/requirements.txt
index a4fe7e2..42cac36 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@ aiohttp_jinja2
 aiohttp
 sqlalchemy
 logbook
+psycopg2-binary
diff --git a/wallabag_kindle_consumer/consumer.py b/wallabag_kindle_consumer/consumer.py
index d11f92c..27e1b2e 100644
--- a/wallabag_kindle_consumer/consumer.py
+++ b/wallabag_kindle_consumer/consumer.py
@@ -60,7 +60,7 @@ class Consumer:
                 await asyncio.gather(*fetches)
                 session.commit()
 
-                jobs = [self.process_job(job, session) for job in session.query(Job).options(joinedload('user'))]
+                jobs = [self.process_job(job, session) for job in session.query(Job).options(joinedload(Job.user))]
                 await asyncio.gather(*jobs)
                 session.commit()
 
diff --git a/wallabag_kindle_consumer/models.py b/wallabag_kindle_consumer/models.py
index 558b7a2..237a4cf 100644
--- a/wallabag_kindle_consumer/models.py
+++ b/wallabag_kindle_consumer/models.py
@@ -28,8 +28,8 @@ class Job(Base):
     id = Column(Integer, primary_key=True, autoincrement=True)
     article = Column(Integer)
     title = Column(String)
-    user_name = Column(Integer, ForeignKey("user.name"))
-    format = Column(Enum('pdf', 'mobi', 'epub'))
+    user_name = Column(String, ForeignKey("user.name"))
+    format = Column(Enum('pdf', 'mobi', 'epub', name='format_enum'))
 
 
 class ContextSession: