old_contents: """Add tracks
  
  Revision ID: 11890f58b1df
  Revises: 4d4b95748173
  Create Date: 2016-08-16 16:48:27.441514
  """
  
  import sqlalchemy as sa
  from alembic import op
  
  
  # revision identifiers, used by Alembic.
  revision = '11890f58b1df'
  down_revision = '4d4b95748173'
  
  
  def upgrade():
      op.create_table(
          'tracks',
          sa.Column('id', sa.Integer(), nullable=False, index=True),
          sa.Column('title', sa.String(), nullable=False),
          sa.Column('event_id', sa.Integer(), nullable=False),
          sa.Column('position', sa.Integer(), nullable=False),
          sa.Column('description', sa.Text(), nullable=False),
          sa.ForeignKeyConstraint(['event_id'], ['events.events.id']),
          sa.PrimaryKeyConstraint('id'),
          schema='events'
      )
  
  
  def downgrade():
      op.drop_table('tracks', schema='events')
  
new_contents: """Add tracks
  
  Revision ID: 11890f58b1df
  Revises: 4d4b95748173
  Create Date: 2016-08-16 16:48:27.441514
  """
  
  import sqlalchemy as sa
  from alembic import op
  
  
  # revision identifiers, used by Alembic.
  revision = '11890f58b1df'
  down_revision = '4d4b95748173'
  
  
  def upgrade():
      op.create_table(
          'tracks',
          sa.Column('id', sa.Integer(), nullable=False),
          sa.Column('title', sa.String(), nullable=False),
          sa.Column('event_id', sa.Integer(), nullable=False, index=True),
          sa.Column('position', sa.Integer(), nullable=False),
          sa.Column('description', sa.Text(), nullable=False),
          sa.ForeignKeyConstraint(['event_id'], ['events.events.id']),
          sa.PrimaryKeyConstraint('id'),
          schema='events'
      )
  
  
  def downgrade():
      op.drop_table('tracks', schema='events')
  
subject: Fix incorrect indexes in alembic revision