diff --git a/pycroft/model/alembic/versions/bc0e0dd480d4_add_bankaccount_owner.py b/pycroft/model/alembic/versions/bc0e0dd480d4_add_bankaccount_owner.py
index 6f9ed7efc..dad485b73 100644
--- a/pycroft/model/alembic/versions/bc0e0dd480d4_add_bankaccount_owner.py
+++ b/pycroft/model/alembic/versions/bc0e0dd480d4_add_bankaccount_owner.py
@@ -10,81 +10,75 @@
 from sqlalchemy.dialects import postgresql
 
 # revision identifiers, used by Alembic.
-revision = 'bc0e0dd480d4'
-down_revision = '55e9f0d9b5f4'
+revision = "bc0e0dd480d4"
+down_revision = "55e9f0d9b5f4"
 branch_labels = None
 depends_on = None
 
 
 def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
-    op.add_column('bank_account', sa.Column('owner', sa.String(length=255), nullable=True))
-    op.drop_index('bank_account_activity_imported_at', table_name='bank_account_activity')
-    op.alter_column('log_entry', 'author_id',
-               existing_type=sa.INTEGER(),
-               nullable=False)
-    op.alter_column('membership_fee', 'booking_begin',
-               existing_type=postgresql.INTERVAL(),
-               nullable=False)
-    op.alter_column('membership_fee', 'booking_end',
-               existing_type=postgresql.INTERVAL(),
-               nullable=False)
-    op.alter_column('pre_member', 'passwd_hash',
-               existing_type=sa.VARCHAR(),
-               nullable=True)
-    op.alter_column('pre_member', 'birthdate',
-               existing_type=sa.DATE(),
-               nullable=True)
-    op.alter_column('room_history_entry', 'active_during',
-               existing_type=postgresql.TSTZRANGE(),
-               nullable=False)
-    op.create_index(op.f('ix_room_history_entry_room_id'), 'room_history_entry', ['room_id'], unique=False)
-    op.create_index(op.f('ix_room_history_entry_user_id'), 'room_history_entry', ['user_id'], unique=False)
-    op.drop_constraint('room_history_entry_room_id_fkey', 'room_history_entry', type_='foreignkey')
-    op.drop_constraint('room_history_entry_user_id_fkey', 'room_history_entry', type_='foreignkey')
-    op.create_foreign_key(None, 'room_history_entry', 'room', ['room_id'], ['id'], ondelete='CASCADE')
-    op.create_foreign_key(None, 'room_history_entry', 'user', ['user_id'], ['id'], ondelete='CASCADE')
-    op.alter_column('task', 'task_type',
-               existing_type=sa.VARCHAR(length=50),
-               nullable=False)
-    op.alter_column('traffic_volume', 'user_id',
-               existing_type=sa.INTEGER(),
-               nullable=False)
+    op.add_column("bank_account", sa.Column("owner", sa.String(length=255), nullable=True))
+    op.drop_index("bank_account_activity_imported_at", table_name="bank_account_activity")
+    op.alter_column("log_entry", "author_id", existing_type=sa.INTEGER(), nullable=False)
+    op.alter_column(
+        "membership_fee", "booking_begin", existing_type=postgresql.INTERVAL(), nullable=False
+    )
+    op.alter_column(
+        "membership_fee", "booking_end", existing_type=postgresql.INTERVAL(), nullable=False
+    )
+    op.alter_column("pre_member", "passwd_hash", existing_type=sa.VARCHAR(), nullable=True)
+    op.alter_column("pre_member", "birthdate", existing_type=sa.DATE(), nullable=True)
+    op.alter_column(
+        "room_history_entry", "active_during", existing_type=postgresql.TSTZRANGE(), nullable=False
+    )
+    op.create_index(
+        op.f("ix_room_history_entry_room_id"), "room_history_entry", ["room_id"], unique=False
+    )
+    op.create_index(
+        op.f("ix_room_history_entry_user_id"), "room_history_entry", ["user_id"], unique=False
+    )
+    op.drop_constraint("room_history_entry_room_id_fkey", "room_history_entry", type_="foreignkey")
+    op.drop_constraint("room_history_entry_user_id_fkey", "room_history_entry", type_="foreignkey")
+    op.create_foreign_key(
+        None, "room_history_entry", "room", ["room_id"], ["id"], ondelete="CASCADE"
+    )
+    op.create_foreign_key(
+        None, "room_history_entry", "user", ["user_id"], ["id"], ondelete="CASCADE"
+    )
+    op.alter_column("task", "task_type", existing_type=sa.VARCHAR(length=50), nullable=False)
+    op.alter_column("traffic_volume", "user_id", existing_type=sa.INTEGER(), nullable=False)
     # ### end Alembic commands ###
 
 
 def downgrade():
     # ### commands auto generated by Alembic - please adjust! ###
-    op.alter_column('traffic_volume', 'user_id',
-               existing_type=sa.INTEGER(),
-               nullable=True)
-    op.alter_column('task', 'task_type',
-               existing_type=sa.VARCHAR(length=50),
-               nullable=True)
-    op.drop_constraint(None, 'room_history_entry', type_='foreignkey')
-    op.drop_constraint(None, 'room_history_entry', type_='foreignkey')
-    op.create_foreign_key('room_history_entry_user_id_fkey', 'room_history_entry', 'user', ['user_id'], ['id'])
-    op.create_foreign_key('room_history_entry_room_id_fkey', 'room_history_entry', 'room', ['room_id'], ['id'])
-    op.drop_index(op.f('ix_room_history_entry_user_id'), table_name='room_history_entry')
-    op.drop_index(op.f('ix_room_history_entry_room_id'), table_name='room_history_entry')
-    op.alter_column('room_history_entry', 'active_during',
-               existing_type=postgresql.TSTZRANGE(),
-               nullable=True)
-    op.alter_column('pre_member', 'birthdate',
-               existing_type=sa.DATE(),
-               nullable=False)
-    op.alter_column('pre_member', 'passwd_hash',
-               existing_type=sa.VARCHAR(),
-               nullable=False)
-    op.alter_column('membership_fee', 'booking_end',
-               existing_type=postgresql.INTERVAL(),
-               nullable=True)
-    op.alter_column('membership_fee', 'booking_begin',
-               existing_type=postgresql.INTERVAL(),
-               nullable=True)
-    op.alter_column('log_entry', 'author_id',
-               existing_type=sa.INTEGER(),
-               nullable=True)
-    op.create_index('bank_account_activity_imported_at', 'bank_account_activity', ['imported_at'], unique=False)
-    op.drop_column('bank_account', 'owner')
+    op.alter_column("traffic_volume", "user_id", existing_type=sa.INTEGER(), nullable=True)
+    op.alter_column("task", "task_type", existing_type=sa.VARCHAR(length=50), nullable=True)
+    op.drop_constraint(None, "room_history_entry", type_="foreignkey")
+    op.drop_constraint(None, "room_history_entry", type_="foreignkey")
+    op.create_foreign_key(
+        "room_history_entry_user_id_fkey", "room_history_entry", "user", ["user_id"], ["id"]
+    )
+    op.create_foreign_key(
+        "room_history_entry_room_id_fkey", "room_history_entry", "room", ["room_id"], ["id"]
+    )
+    op.drop_index(op.f("ix_room_history_entry_user_id"), table_name="room_history_entry")
+    op.drop_index(op.f("ix_room_history_entry_room_id"), table_name="room_history_entry")
+    op.alter_column(
+        "room_history_entry", "active_during", existing_type=postgresql.TSTZRANGE(), nullable=True
+    )
+    op.alter_column("pre_member", "birthdate", existing_type=sa.DATE(), nullable=False)
+    op.alter_column("pre_member", "passwd_hash", existing_type=sa.VARCHAR(), nullable=False)
+    op.alter_column(
+        "membership_fee", "booking_end", existing_type=postgresql.INTERVAL(), nullable=True
+    )
+    op.alter_column(
+        "membership_fee", "booking_begin", existing_type=postgresql.INTERVAL(), nullable=True
+    )
+    op.alter_column("log_entry", "author_id", existing_type=sa.INTEGER(), nullable=True)
+    op.create_index(
+        "bank_account_activity_imported_at", "bank_account_activity", ["imported_at"], unique=False
+    )
+    op.drop_column("bank_account", "owner")
     # ### end Alembic commands ###