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+# Copyright 2018 New Vector Ltd
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+#
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+# Licensed under the Apache License, Version 2.0 (the "License");
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+# you may not use this file except in compliance with the License.
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+# You may obtain a copy of the License at
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+#
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+# http://www.apache.org/licenses/LICENSE-2.0
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+#
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+# Unless required by applicable law or agreed to in writing, software
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+# distributed under the License is distributed on an "AS IS" BASIS,
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+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+# See the License for the specific language governing permissions and
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+# limitations under the License.
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+
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+from synapse.storage.engines import PostgresEngine
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+from synapse.storage.prepare_database import get_statements
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+
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+FIX_INDEXES = """
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+-- rebuild indexes as uniques
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+DROP INDEX groups_invites_g_idx;
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+CREATE UNIQUE INDEX group_invites_g_idx ON group_invites(group_id, user_id);
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+DROP INDEX groups_users_g_idx;
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+CREATE UNIQUE INDEX group_users_g_idx ON group_users(group_id, user_id);
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+
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+-- rename other indexes to actually match their table names..
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+DROP INDEX groups_users_u_idx;
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+CREATE INDEX group_users_u_idx ON group_users(user_id);
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+DROP INDEX groups_invites_u_idx;
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+CREATE INDEX group_invites_u_idx ON group_invites(user_id);
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+DROP INDEX groups_rooms_g_idx;
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+CREATE UNIQUE INDEX group_rooms_g_idx ON group_rooms(group_id, room_id);
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+DROP INDEX groups_rooms_r_idx;
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+CREATE INDEX group_rooms_r_idx ON group_rooms(room_id);
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+"""
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+
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+
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+def run_create(cur, database_engine, *args, **kwargs):
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+ rowid = "ctid" if isinstance(database_engine, PostgresEngine) else "rowid"
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+
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+ # remove duplicates from group_users & group_invites tables
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+ cur.execute("""
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+ DELETE FROM group_users WHERE %s NOT IN (
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+ SELECT min(%s) FROM group_users GROUP BY group_id, user_id
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+ );
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+ """ % (rowid, rowid))
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+ cur.execute("""
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+ DELETE FROM group_invites WHERE %s NOT IN (
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+ SELECT min(%s) FROM group_invites GROUP BY group_id, user_id
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+ );
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+ """ % (rowid, rowid))
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+
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+ for statement in get_statements(FIX_INDEXES.splitlines()):
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+ cur.execute(statement)
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+
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+
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+def run_upgrade(*args, **kwargs):
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+ pass
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