  from django.db.backends.postgresql_psycopg2.version import get_version
  from django.db.backends.postgresql_psycopg2.introspection import DatabaseIntrospection
  from django.utils.log import getLogger
  from django.utils.safestring import SafeUnicode, SafeString
  from django.utils.timezone import utc
  
  try:
      import psycopg2 as Database
 
</s>
from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
  from django.db.backends.postgresql_psycopg2.version import get_version
  from django.db.backends.postgresql_psycopg2.introspection import DatabaseIntrospection
from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
  from django.utils.log import getLogger
  from django.utils.safestring import SafeUnicode, SafeString
  from django.utils.timezone import utc
  
  try:
      import psycopg2 as Database
keep add keep keep keep keep keep keep
 Very start of schema alteration port. Create/delete model and some tests.
django/db/backends/postgresql_psycopg2/base.py