migrations: Import BaseDatabaseSchemaEditor from its canonical module.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

analytics/migrations/0009_remove_messages_to_stream_stat.py

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

confirmation/migrations/0009_confirmation_expiry_date_backfill.py

@@ -5,7 +5,7 @@ from datetime import timedelta
 
 from django.conf import settings
 from django.db import migrations, transaction
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

pgroonga/migrations/0002_html_escape_subject.py

@@ -1,5 +1,5 @@
 from django.db import connection, migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from psycopg2.sql import SQL
 

zerver/migrations/0001_initial.py

@@ -8,7 +8,7 @@ from django.conf import settings
 from django.contrib.postgres.indexes import GinIndex
 from django.contrib.postgres.search import SearchVectorField
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models.functions import Upper
 

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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0032_verify_all_medium_avatar_images.py

@@ -3,7 +3,7 @@ from unittest.mock import patch
 
 from django.conf import settings
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 from zerver.lib.upload import upload_backend

zerver/migrations/0033_migrate_domain_to_realmalias.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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 orjson
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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 orjson
 from django.db import connection, migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from psycopg2.sql import SQL
 

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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0143_realm_bot_creation_policy.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.11.6 on 2018-03-09 18:00
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 BOT_CREATION_EVERYONE = 1

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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0149_realm_emoji_drop_unique_constraint.py

@@ -4,7 +4,7 @@ import shutil
 import boto3.session
 from django.conf import settings
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from mypy_boto3_s3.type_defs import CopySourceTypeDef
 

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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0177_user_message_add_and_index_is_private_flag.py

@@ -2,7 +2,7 @@
 
 import bitfield.models
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import F, Q
 

zerver/migrations/0181_userprofile_change_emojiset.py

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

zerver/migrations/0182_set_initial_value_is_private_flag.py

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

zerver/migrations/0209_user_profile_no_empty_password.py

@@ -6,7 +6,7 @@ import orjson
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0214_realm_invite_to_stream_policy.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.11.20 on 2019-04-29 05:29
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 INVITE_TO_STREAM_POLICY_MEMBERS = 1

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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Min
 from psycopg2.sql import SQL

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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0244_message_copy_pub_date_to_date_sent.py

@@ -2,7 +2,7 @@ import time
 
 from django.contrib.postgres.operations import AddIndexConcurrently
 from django.db import connection, migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Min
 from psycopg2.sql import SQL

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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 INT_VALUE = {

zerver/migrations/0248_userprofile_role_start.py

@@ -1,6 +1,6 @@
 # Generated by Django 1.11.24 on 2019-10-03 22:27
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0257_fix_has_link_attribute.py

@@ -5,7 +5,7 @@ from typing import cast
 
 import lxml
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 BATCH_SIZE = 1000

zerver/migrations/0260_missed_message_addresses_from_redis_to_db.py

@@ -2,7 +2,7 @@ import secrets
 
 from django.core.exceptions import ObjectDoesNotExist
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 # Imported to avoid needing to duplicate Redis-related code.

zerver/migrations/0261_pregistrationuser_clear_invited_as_admin.py

@@ -1,7 +1,7 @@
 # Generated by Django 1.11.26 on 2020-06-16 22:26
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

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.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0273_migrate_old_bot_messages.py

@@ -2,7 +2,7 @@ from typing import Any
 
 from django.conf import settings
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0277_migrate_alert_word.py

@@ -2,7 +2,7 @@ from typing import Dict, List
 
 import orjson
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0284_convert_realm_admins_to_realm_owners.py

@@ -3,7 +3,7 @@ from typing import Any, Dict
 
 import orjson
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Count
 from django.utils.timezone import now as timezone_now

zerver/migrations/0285_remove_realm_google_hangouts_domain.py

@@ -1,7 +1,7 @@
 # Generated by Django 2.2.13 on 2020-06-14 01:58
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 VIDEO_CHAT_PROVIDERS = {

zerver/migrations/0287_clear_duplicate_reactions.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Count
 

zerver/migrations/0290_remove_night_mode_add_color_scheme.py

@@ -1,7 +1,7 @@
 # Generated by Django 2.2.13 on 2020-06-20 15:22
 
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 COLOR_SCHEME_AUTOMATIC = 1

zerver/migrations/0293_update_invite_as_dict_values.py

@@ -1,7 +1,7 @@
 # Generated by Django 2.2.13 on 2020-06-21 21:13
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0298_fix_realmauditlog_format.py

@@ -3,7 +3,7 @@
 import json
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0304_remove_default_status_of_default_private_streams.py

@@ -1,7 +1,7 @@
 # Generated by Django 2.2.14 on 2020-08-10 20:21
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0313_finish_is_user_active_migration.py

@@ -2,7 +2,7 @@
 
 from django.contrib.postgres.operations import AddIndexConcurrently
 from django.db import connection, migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0317_migrate_to_invite_to_realm_policy.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.1.7 on 2021-04-01 19:27
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0322_realm_create_audit_log_backfill.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.1.8 on 2021-04-20 10:09
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0323_show_starred_message_counts.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.1.8 on 2021-05-01 12:34
 
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0328_migrate_to_edit_topic_policy.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.2.2 on 2021-05-26 09:43
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0333_alter_realm_org_type.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.2.4 on 2021-07-06 20:34
 
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0338_migrate_to_add_custom_emoji_policy.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.2.2 on 2021-05-15 18:01
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0345_alter_realm_name.py

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

zerver/migrations/0346_create_realm_user_default_table.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.2.2 on 2021-06-01 16:19
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0352_migrate_twenty_four_hour_time_to_realmuserdefault.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.2.6 on 2021-09-17 17:08
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import F
 

zerver/migrations/0354_alter_realm_message_content_delete_limit_seconds.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.2.4 on 2021-06-14 12:12
 
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0356_migrate_to_delete_own_message_policy.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.2.4 on 2021-06-09 10:02
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0358_split_create_stream_policy.py

@@ -1,5 +1,5 @@
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import F
 

zerver/migrations/0359_re2_linkifiers.py

@@ -1,6 +1,6 @@
 import re2
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0371_invalid_characters_in_topics.py

@@ -1,7 +1,7 @@
 import unicodedata
 
 from django.db import connection, migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 # There are 66 Unicode non-characters; see

zerver/migrations/0373_fix_deleteduser_dummies.py

@@ -5,7 +5,7 @@ from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.validators import validate_email
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0374_backfill_user_delete_realmauditlog.py

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

zerver/migrations/0375_invalid_characters_in_stream_names.py

@@ -1,7 +1,7 @@
 import unicodedata
 
 from django.db import connection, migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 # There are 66 Unicode non-characters; see

zerver/migrations/0376_set_realmemoji_author_and_reupload_realmemoji.py

@@ -1,5 +1,5 @@
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import OuterRef, Subquery
 

zerver/migrations/0377_message_edit_history_format.py

@@ -3,7 +3,7 @@ from typing import Any, List, Optional, Type, TypedDict
 
 import orjson
 from django.db import migrations, transaction
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Min
 

zerver/migrations/0380_userprofile_uuid_backfill.py

@@ -1,7 +1,7 @@
 import uuid
 
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 

zerver/migrations/0382_create_role_based_system_groups.py

@@ -1,7 +1,7 @@
 # Generated by Django 3.2.7 on 2021-10-16 12:41
 
 from django.db import migrations, transaction
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.utils.timezone import now as timezone_now
 

zerver/migrations/0383_revoke_invitations_from_deactivated_users.py

@@ -1,7 +1,7 @@
 from typing import List
 
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.utils.timezone import now as timezone_now
 

zerver/migrations/0386_fix_attachment_caches.py

@@ -3,7 +3,7 @@
 from typing import Type
 
 from django.db import migrations, models
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 from django.db.models import Exists, Model, OuterRef
 

zerver/migrations/0387_reupload_realmemoji_again.py

@@ -1,6 +1,6 @@
 from django.conf import settings
 from django.db import migrations
-from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
 
 from zerver.lib.queue import queue_json_publish

zerver/migrations/0390_fix_stream_history_public_to_subscribers.py

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