migrations: Use django.db.backends.postgresql.schema.

This replaces django.db.backends.postgresql_psycopg2, which has been
an alias to django.db.backends.postgresql since Django 1.9.

analytics/migrations/0009_remove_messages_to_stream_stat.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

analytics/migrations/0010_clear_messages_sent_values.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

analytics/migrations/0011_clear_analytics_tables.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

analytics/migrations/0015_clear_duplicate_counts.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Count, Sum
 

pgroonga/migrations/0002_html_escape_subject.py

@@ -1,5 +1,5 @@
 from django.db import connection, migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 from zerver.lib.migrate import do_batch_update

zerver/migrations/0001_initial.py

@@ -6,7 +6,7 @@ import django.db.models.deletion
 import django.utils.timezone
 from django.conf import settings
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 import zerver.models

zerver/migrations/0029_realm_subdomain.py

@@ -1,7 +1,7 @@
 from django.conf import settings
 from django.core.exceptions import ObjectDoesNotExist
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0032_verify_all_medium_avatar_images.py

@@ -3,7 +3,7 @@ from typing import Text
 
 from django.conf import settings
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from mock import patch
 

zerver/migrations/0033_migrate_domain_to_realmalias.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0037_disallow_null_string_id.py

@@ -1,5 +1,5 @@
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.utils import IntegrityError
 

zerver/migrations/0041_create_attachments_for_old_messages.py

@@ -2,7 +2,7 @@ import os
 import re
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 attachment_url_re = re.compile(r'[/\-]user[\-_]uploads[/\.-].*?(?=[ )]|\Z)')

zerver/migrations/0057_realmauditlog.py

@@ -2,7 +2,7 @@
 import django.db.models.deletion
 from django.conf import settings
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.utils.timezone import now as timezone_now
 

zerver/migrations/0074_fix_duplicate_attachments.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.10.5 on 2017-04-13 22:12
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Count
 

zerver/migrations/0079_remove_old_scheduled_jobs.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.10.5 on 2017-05-10 05:59
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0081_make_emoji_lowercase.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.10.5 on 2017-05-02 21:44
 import django.core.validators
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0085_fix_bots_with_none_bot_type.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.11.2 on 2017-06-20 10:31
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0087_remove_old_scheduled_jobs.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.10.5 on 2017-05-10 05:59
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0093_subscription_event_log_backfill.py

@@ -1,5 +1,5 @@
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Max
 from django.utils.timezone import now as timezone_now

zerver/migrations/0097_reactions_emoji_code.py

@@ -3,7 +3,7 @@ import os
 
 import ujson
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0102_convert_muted_topic.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.4 on 2017-08-30 00:26
 import ujson
 from django.db import connection, migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0104_fix_unreads.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.11.4 on 2017-08-30 00:26
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 from zerver.lib.fix_unreads import fix

zerver/migrations/0108_fix_default_string_id.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.11.4 on 2017-08-24 02:39
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0109_mark_tutorial_status_finished.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0110_stream_is_in_zephyr_realm.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.11.5 on 2017-10-08 18:37
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0121_realm_signup_notifications_stream.py

@@ -2,7 +2,7 @@
 
 import django.db.models.deletion
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0126_prereg_remove_users_without_realm.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.6 on 2017-11-30 04:58
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0128_scheduledemail_realm.py

@@ -2,7 +2,7 @@
 
 import django.db.models.deletion
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0130_text_choice_in_emojiset.py

@@ -1,5 +1,5 @@
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0139_fill_last_message_id_in_subscription_logs.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0143_realm_bot_creation_policy.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.6 on 2018-03-09 18:00
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0145_reactions_realm_emoji_name_to_id.py

@@ -2,7 +2,7 @@ from collections import defaultdict
 from typing import Any, Dict
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0149_realm_emoji_drop_unique_constraint.py

@@ -4,7 +4,7 @@ import shutil
 from boto.s3.connection import S3Connection
 from django.conf import settings
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0154_fix_invalid_bot_owner.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.6 on 2018-04-03 01:52
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0164_stream_history_public_to_subscribers.py

@@ -2,7 +2,7 @@
 
 from django.conf import settings
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0167_custom_profile_fields_sort_order.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.11 on 2018-04-08 15:49
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import F
 

zerver/migrations/0174_userprofile_delivery_email.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.13 on 2018-07-05 17:57
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import F
 

zerver/migrations/0175_change_realm_audit_log_event_type_tense.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0177_user_message_add_and_index_is_private_flag.py

@@ -4,7 +4,7 @@ import sys
 
 import bitfield.models
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import F
 

zerver/migrations/0181_userprofile_change_emojiset.py

@@ -1,5 +1,5 @@
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0182_set_initial_value_is_private_flag.py

@@ -1,7 +1,7 @@
 import sys
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import F
 

zerver/migrations/0189_userprofile_add_some_emojisets.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.14 on 2018-08-28 19:01
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0198_preregistrationuser_invited_as.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.16 on 2018-12-27 17:09
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0206_stream_rendered_description.py

@@ -1,5 +1,5 @@
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 from zerver.lib.actions import render_stream_description

zerver/migrations/0209_user_profile_no_empty_password.py

@@ -6,7 +6,7 @@ import ujson
 from django.conf import settings
 from django.contrib.auth.hashers import check_password, make_password
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.utils.timezone import now as timezone_now
 

zerver/migrations/0210_stream_first_message_id.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.18 on 2019-02-25 12:42
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0211_add_users_field_to_scheduled_email.py

@@ -2,7 +2,7 @@
 
 from django.conf import settings
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0214_realm_invite_to_stream_policy.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.20 on 2019-04-29 05:29
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0217_migrate_create_stream_policy.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.20 on 2019-05-06 13:15
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0219_toggle_realm_digest_emails_enabled_default.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.20 on 2019-05-08 05:42
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0221_subscription_notifications_data_migration.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.18 on 2019-02-13 20:13
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 RECIPIENT_STREAM = 2

zerver/migrations/0223_rename_to_is_muted.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.14 on 2018-08-10 16:04
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Case, Value, When
 

zerver/migrations/0224_alter_field_realm_video_chat_provider.py

@@ -3,7 +3,7 @@
 from typing import Any, Dict, Optional
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 # We include a copy of this structure as it was at the time this

zerver/migrations/0227_inline_url_embed_preview_default_off.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.20 on 2019-05-31 02:33
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0236_remove_illegal_characters_email_full.py

@@ -3,7 +3,7 @@
 from unicodedata import category
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 NAME_INVALID_CHARS = ['*', '`', "\\", '>', '"', '@']

zerver/migrations/0237_rename_zulip_realm_to_zulipinternal.py

@@ -1,6 +1,6 @@
 from django.conf import settings
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0239_usermessage_copy_id_to_bigint_id.py

@@ -3,7 +3,7 @@
 import time
 
 from django.db import connection, migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Min
 

zerver/migrations/0242_fix_bot_email_property.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.24 on 2019-09-23 20:39
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0244_message_copy_pub_date_to_date_sent.py

@@ -1,7 +1,7 @@
 import time
 
 from django.db import connection, migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Min
 

zerver/migrations/0247_realmauditlog_event_type_to_int.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.24 on 2019-10-02 16:48
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 INT_VALUE = {

zerver/migrations/0248_userprofile_role_start.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.24 on 2019-10-03 22:27
 
 from django.db import migrations, models
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 def update_role(apps: StateApps, schema_editor: DatabaseSchemaEditor) -> None:

zerver/migrations/0257_fix_has_link_attribute.py

@@ -4,7 +4,7 @@ import time
 
 import lxml
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 BATCH_SIZE = 1000

zerver/migrations/0260_missed_message_addresses_from_redis_to_db.py

@@ -1,6 +1,6 @@
 from django.core.exceptions import ObjectDoesNotExist
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 # Imported to avoid needing to duplicate redis-related code.

zerver/migrations/0264_migrate_is_announcement_only.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.26 on 2020-01-25 23:47
 
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0273_migrate_old_bot_messages.py

@@ -3,7 +3,7 @@ from __future__ import unicode_literals
 
 from django.conf import settings
 from django.db import migrations
-from django.db.backends.postgresql_psycopg2.schema import DatabaseSchemaEditor
+from django.db.backends.postgresql.schema import DatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 from typing import Any