diff --git a/synapse/storage/prepare_database.py b/synapse/storage/prepare_database.py
index 1a74d6e360..9800fd4203 100644
--- a/synapse/storage/prepare_database.py
+++ b/synapse/storage/prepare_database.py
@@ -25,7 +25,7 @@ logger = logging.getLogger(__name__)
# Remember to update this number every time a change is made to database
# schema files, so the users will be informed on server restarts.
-SCHEMA_VERSION = 25
+SCHEMA_VERSION = 26
dir_path = os.path.abspath(os.path.dirname(__file__))
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index ae1ad56d9a..183855ba40 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -269,3 +269,39 @@ class RoomMemberStore(SQLBaseStore):
ret = len(room_id_lists.pop(0).intersection(*room_id_lists)) > 0
defer.returnValue(ret)
+
+ def forget(self, user_id, room_id):
+ def f(txn):
+ sql = (
+ "UPDATE"
+ " room_memberships"
+ " SET"
+ " forgotten = 1"
+ " WHERE"
+ " user_id = ?"
+ " AND"
+ " room_id = ?"
+ )
+ txn.execute(sql, (user_id, room_id))
+ self.runInteraction("forget_membership", f)
+
+ @defer.inlineCallbacks
+ def did_forget(self, user_id, room_id):
+ def f(txn):
+ sql = (
+ "SELECT"
+ " COUNT(*)"
+ "FROM"
+ " room_memberships"
+ " WHERE"
+ " user_id = ?"
+ " AND"
+ " room_id = ?"
+ " AND"
+ " forgotten = 1"
+ )
+ txn.execute(sql, (user_id, room_id))
+ rows = txn.fetchall()
+ return rows[0][0]
+ count = yield self.runInteraction("did_forget_membership", f)
+ defer.returnValue(count > 0)
diff --git a/synapse/storage/schema/delta/26/forgotten_memberships.sql b/synapse/storage/schema/delta/26/forgotten_memberships.sql
new file mode 100644
index 0000000000..df55b9c6f6
--- /dev/null
+++ b/synapse/storage/schema/delta/26/forgotten_memberships.sql
@@ -0,0 +1,24 @@
+/* Copyright 2015 OpenMarket 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.
+ */
+
+/*
+ * Keeps track of what rooms users have left and don't want to be able to
+ * access again.
+ *
+ * If all users on this server have left a room, we can delete the room
+ * entirely.
+ */
+
+ ALTER TABLE room_memberships ADD COLUMN forgotten INTEGER(1) DEFAULT 0;
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