--- a/candolint/models.py	Wed May 30 17:54:54 2018 +0800
+++ b/candolint/models.py	Wed May 30 18:20:33 2018 +0800
@@ -5,7 +5,7 @@
 from candolint import adapters
 
 
-database = pw.SqliteDatabase(None, journal_mode='WAL')
+database = pw.SqliteDatabase(None, pragmas={'journal_mode': 'wal'})
 
 
 class BaseModel(pw.Model):
@@ -73,7 +73,7 @@
     author = pw.CharField()
     message = pw.CharField()
 
-    project = pw.ForeignKeyField(Project, related_name='changes')
+    project = pw.ForeignKeyField(Project, backref='changes')
 
     class Meta:
         indexes = (
@@ -90,8 +90,8 @@
     started = pw.DateTimeField()
     finished = pw.DateTimeField()
 
-    project = pw.ForeignKeyField(Project, related_name='checks')
-    change = pw.ForeignKeyField(Change, related_name='checks')
+    project = pw.ForeignKeyField(Project, backref='checks')
+    change = pw.ForeignKeyField(Change, backref='checks')
 
     class Meta:
         indexes = (
@@ -110,10 +110,9 @@
 
     @classmethod
     def get_next_ordinal(cls, project):
-        max_ordinal = (cls
-            .select(pw.fn.COALESCE(pw.fn.MAX(cls.ordinal), 0))
+        return (cls
+            .select(pw.fn.COALESCE(pw.fn.MAX(cls.ordinal), 0) + 1)
             .where(cls.project == project))
-        return max_ordinal + 1
 
     @classmethod
     def get_light_fields(cls):

--- a/incoming.py	Wed May 30 17:54:54 2018 +0800
+++ b/incoming.py	Wed May 30 18:20:33 2018 +0800
@@ -212,7 +212,7 @@
 
     database.init(rel('database.sqlite'))
     database.connect()
-    database.create_tables([Project, Change, Check], safe=True)
+    database.create_tables([Project, Change, Check])
     if args.debug:
         logger = logging.getLogger('peewee')
         logger.setLevel(logging.DEBUG)

--- a/requirements.txt	Wed May 30 17:54:54 2018 +0800
+++ b/requirements.txt	Wed May 30 18:20:33 2018 +0800
@@ -1,4 +1,4 @@
-peewee==2.10.2
+peewee==3.5.0
 PyYAML==3.12
 redis==2.10.6
 tornado==4.5.3

--- a/run-tests.py	Wed May 30 17:54:54 2018 +0800
+++ b/run-tests.py	Wed May 30 18:20:33 2018 +0800
@@ -10,7 +10,7 @@
 def main():
     database.init(':memory:')
     database.connect()
-    database.create_tables([Project, Change, Check], safe=True)
+    database.create_tables([Project, Change, Check])
     database.init = Mock()
     database.connect = Mock()
     database.close = Mock()