diff --git a/synapse/storage/schema/delta/47/last_access_media.sql b/synapse/storage/schema/delta/47/last_access_media.sql
new file mode 100644
index 0000000000..f505fb22b5
--- /dev/null
+++ b/synapse/storage/schema/delta/47/last_access_media.sql
@@ -0,0 +1,16 @@
+/* Copyright 2018 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+ALTER TABLE local_media_repository ADD COLUMN last_access_ts BIGINT;
diff --git a/synapse/storage/schema/delta/47/state_group_seq.py b/synapse/storage/schema/delta/47/state_group_seq.py
new file mode 100644
index 0000000000..f6766501d2
--- /dev/null
+++ b/synapse/storage/schema/delta/47/state_group_seq.py
@@ -0,0 +1,37 @@
+# Copyright 2018 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from synapse.storage.engines import PostgresEngine
+
+
+def run_create(cur, database_engine, *args, **kwargs):
+ if isinstance(database_engine, PostgresEngine):
+ # if we already have some state groups, we want to start making new
+ # ones with a higher id.
+ cur.execute("SELECT max(id) FROM state_groups")
+ row = cur.fetchone()
+
+ if row[0] is None:
+ start_val = 1
+ else:
+ start_val = row[0] + 1
+
+ cur.execute(
+ "CREATE SEQUENCE state_group_id_seq START WITH %s",
+ (start_val, ),
+ )
+
+
+def run_upgrade(*args, **kwargs):
+ pass
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