Fix remaining migration scripts and remove initdb/flushdb from manage.py

admin/migrations/versions/12e9a4f6ed73_.py

@@ -13,23 +13,35 @@ down_revision = '27ae2f102682'
 from alembic import op
 import sqlalchemy as sa
 
-from mailu.admin import models
-from mailu import db
+
+user_table = sa.Table(
+    'user',
+    sa.MetaData(),
+    sa.Column('email', sa.String(255), primary_key=True),
+    sa.Column('spam_threshold', sa.Numeric())
+)
+
 
 
 def upgrade():
+    connection = op.get_bind()
     # Make sure that every value is already an Integer
-    for user in models.User.query.all():
-         user.spam_threshold = int(user.spam_threshold)
-    db.session.commit()
+    for user in connection.execute(user_table.select()):
+        connection.execute(
+            user_table.update().where(
+                user_table.c.email == user.email
+            ).values(
+                spam_threshold=int(user.spam_threshold)
+            )
+        )
     # Migrate the table
     with op.batch_alter_table('user') as batch:
         batch.alter_column(
-            'spam_threshold', existing_type=db.Numeric(), type_=db.Integer())
+            'spam_threshold', existing_type=sa.Numeric(), type_=sa.Integer())
 
 
 def downgrade():
     # Migrate the table
     with op.batch_alter_table('user') as batch:
         batch.alter_column(
-            'spam_threshold', existing_type=db.Integer(), type_=db.Numeric())
+            'spam_threshold', existing_type=sa.Integer(), type_=sa.Numeric())