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-rw-r--r--synapse/storage/events.py12
-rw-r--r--synapse/storage/keys.py123
-rw-r--r--synapse/storage/registration.py34
-rw-r--r--synapse/storage/schema/delta/13/v13.sql20
-rw-r--r--synapse/storage/schema/delta/14/upgrade_appservice_db.py42
-rw-r--r--synapse/storage/schema/delta/16/unique_constraints.sql8
-rw-r--r--synapse/storage/schema/delta/24/stats_reporting.sql12
-rw-r--r--synapse/storage/schema/delta/30/state_stream.sql9
-rw-r--r--synapse/storage/schema/delta/32/remove_indices.sql4
-rw-r--r--synapse/storage/schema/delta/54/account_validity.sql (renamed from synapse/storage/schema/full_schemas/11/profiles.sql)11
-rw-r--r--synapse/storage/schema/delta/54/drop_legacy_tables.sql30
-rw-r--r--synapse/storage/schema/full_schemas/11/event_edges.sql91
-rw-r--r--synapse/storage/schema/full_schemas/11/event_signatures.sql55
-rw-r--r--synapse/storage/schema/full_schemas/11/im.sql123
-rw-r--r--synapse/storage/schema/full_schemas/11/keys.sql31
-rw-r--r--synapse/storage/schema/full_schemas/11/media_repository.sql65
-rw-r--r--synapse/storage/schema/full_schemas/11/presence.sql35
-rw-r--r--synapse/storage/schema/full_schemas/11/redactions.sql22
-rw-r--r--synapse/storage/schema/full_schemas/11/room_aliases.sql24
-rw-r--r--synapse/storage/schema/full_schemas/11/state.sql40
-rw-r--r--synapse/storage/schema/full_schemas/11/transactions.sql44
-rw-r--r--synapse/storage/schema/full_schemas/11/users.sql43
-rw-r--r--synapse/storage/schema/full_schemas/16/application_services.sql19
-rw-r--r--synapse/storage/schema/full_schemas/16/event_edges.sql30
-rw-r--r--synapse/storage/schema/full_schemas/16/event_signatures.sql23
-rw-r--r--synapse/storage/schema/full_schemas/16/im.sql21
-rw-r--r--synapse/storage/schema/full_schemas/16/keys.sql11
-rw-r--r--synapse/storage/schema/full_schemas/16/presence.sql2
28 files changed, 147 insertions, 837 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index dfda39bbe0..7a7f841c6c 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -1179,14 +1179,10 @@ class EventsStore(
             "events",
             "event_auth",
             "event_json",
-            "event_content_hashes",
-            "event_destinations",
-            "event_edge_hashes",
             "event_edges",
             "event_forward_extremities",
             "event_reference_hashes",
             "event_search",
-            "event_signatures",
             "event_to_state_groups",
             "guest_access",
             "history_visibility",
@@ -1857,16 +1853,12 @@ class EventsStore(
         # Tables that should be pruned:
         #     event_auth
         #     event_backward_extremities
-        #     event_content_hashes
-        #     event_destinations
-        #     event_edge_hashes
         #     event_edges
         #     event_forward_extremities
         #     event_json
         #     event_push_actions
         #     event_reference_hashes
         #     event_search
-        #     event_signatures
         #     event_to_state_groups
         #     events
         #     rejections
@@ -2065,14 +2057,10 @@ class EventsStore(
             "events",
             "event_json",
             "event_auth",
-            "event_content_hashes",
-            "event_destinations",
-            "event_edge_hashes",
             "event_edges",
             "event_forward_extremities",
             "event_reference_hashes",
             "event_search",
-            "event_signatures",
             "rejections",
         ):
             logger.info("[purge] removing events from %s", table)
diff --git a/synapse/storage/keys.py b/synapse/storage/keys.py
index 030cd1e5a3..7036541792 100644
--- a/synapse/storage/keys.py
+++ b/synapse/storage/keys.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 # Copyright 2014-2016 OpenMarket Ltd
+# Copyright 2019 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.
@@ -13,17 +14,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import hashlib
+import itertools
 import logging
 
 import six
 
 from signedjson.key import decode_verify_key_bytes
 
-import OpenSSL
-from twisted.internet import defer
-
-from synapse.util.caches.descriptors import cachedInlineCallbacks
+from synapse.util import batch_iter
+from synapse.util.caches.descriptors import cached, cachedList
 
 from ._base import SQLBaseStore
 
@@ -38,83 +37,52 @@ else:
 
 
 class KeyStore(SQLBaseStore):
-    """Persistence for signature verification keys and tls X.509 certificates
+    """Persistence for signature verification keys
     """
 
-    @defer.inlineCallbacks
-    def get_server_certificate(self, server_name):
-        """Retrieve the TLS X.509 certificate for the given server
+    @cached()
+    def _get_server_verify_key(self, server_name_and_key_id):
+        raise NotImplementedError()
+
+    @cachedList(
+        cached_method_name="_get_server_verify_key", list_name="server_name_and_key_ids"
+    )
+    def get_server_verify_keys(self, server_name_and_key_ids):
+        """
         Args:
-            server_name (bytes): The name of the server.
+            server_name_and_key_ids (iterable[Tuple[str, str]]):
+                iterable of (server_name, key-id) tuples to fetch keys for
+
         Returns:
-            (OpenSSL.crypto.X509): The tls certificate.
+            Deferred: resolves to dict[Tuple[str, str], VerifyKey|None]:
+                map from (server_name, key_id) -> VerifyKey, or None if the key is
+                unknown
         """
-        tls_certificate_bytes, = yield self._simple_select_one(
-            table="server_tls_certificates",
-            keyvalues={"server_name": server_name},
-            retcols=("tls_certificate",),
-            desc="get_server_certificate",
-        )
-        tls_certificate = OpenSSL.crypto.load_certificate(
-            OpenSSL.crypto.FILETYPE_ASN1, tls_certificate_bytes
-        )
-        defer.returnValue(tls_certificate)
+        keys = {}
 
-    def store_server_certificate(
-        self, server_name, from_server, time_now_ms, tls_certificate
-    ):
-        """Stores the TLS X.509 certificate for the given server
-        Args:
-            server_name (str): The name of the server.
-            from_server (str): Where the certificate was looked up
-            time_now_ms (int): The time now in milliseconds
-            tls_certificate (OpenSSL.crypto.X509): The X.509 certificate.
-        """
-        tls_certificate_bytes = OpenSSL.crypto.dump_certificate(
-            OpenSSL.crypto.FILETYPE_ASN1, tls_certificate
-        )
-        fingerprint = hashlib.sha256(tls_certificate_bytes).hexdigest()
-        return self._simple_upsert(
-            table="server_tls_certificates",
-            keyvalues={"server_name": server_name, "fingerprint": fingerprint},
-            values={
-                "from_server": from_server,
-                "ts_added_ms": time_now_ms,
-                "tls_certificate": db_binary_type(tls_certificate_bytes),
-            },
-            desc="store_server_certificate",
-        )
+        def _get_keys(txn, batch):
+            """Processes a batch of keys to fetch, and adds the result to `keys`."""
 
-    @cachedInlineCallbacks()
-    def _get_server_verify_key(self, server_name, key_id):
-        verify_key_bytes = yield self._simple_select_one_onecol(
-            table="server_signature_keys",
-            keyvalues={"server_name": server_name, "key_id": key_id},
-            retcol="verify_key",
-            desc="_get_server_verify_key",
-            allow_none=True,
-        )
+            # batch_iter always returns tuples so it's safe to do len(batch)
+            sql = (
+                "SELECT server_name, key_id, verify_key FROM server_signature_keys "
+                "WHERE 1=0"
+            ) + " OR (server_name=? AND key_id=?)" * len(batch)
 
-        if verify_key_bytes:
-            defer.returnValue(decode_verify_key_bytes(key_id, bytes(verify_key_bytes)))
+            txn.execute(sql, tuple(itertools.chain.from_iterable(batch)))
 
-    @defer.inlineCallbacks
-    def get_server_verify_keys(self, server_name, key_ids):
-        """Retrieve the NACL verification key for a given server for the given
-        key_ids
-        Args:
-            server_name (str): The name of the server.
-            key_ids (iterable[str]): key_ids to try and look up.
-        Returns:
-            Deferred: resolves to dict[str, VerifyKey]: map from
-               key_id to verification key.
-        """
-        keys = {}
-        for key_id in key_ids:
-            key = yield self._get_server_verify_key(server_name, key_id)
-            if key:
-                keys[key_id] = key
-        defer.returnValue(keys)
+            for row in txn:
+                server_name, key_id, key_bytes = row
+                keys[(server_name, key_id)] = decode_verify_key_bytes(
+                    key_id, bytes(key_bytes)
+                )
+
+        def _txn(txn):
+            for batch in batch_iter(server_name_and_key_ids, 50):
+                _get_keys(txn, batch)
+            return keys
+
+        return self.runInteraction("get_server_verify_keys", _txn)
 
     def store_server_verify_key(
         self, server_name, from_server, time_now_ms, verify_key
@@ -140,8 +108,11 @@ class KeyStore(SQLBaseStore):
                     "verify_key": db_binary_type(verify_key.encode()),
                 },
             )
+            # invalidate takes a tuple corresponding to the params of
+            # _get_server_verify_key. _get_server_verify_key only takes one
+            # param, which is itself the 2-tuple (server_name, key_id).
             txn.call_after(
-                self._get_server_verify_key.invalidate, (server_name, key_id)
+                self._get_server_verify_key.invalidate, ((server_name, key_id),)
             )
 
         return self.runInteraction("store_server_verify_key", _txn)
@@ -188,8 +159,8 @@ class KeyStore(SQLBaseStore):
         Args:
             server_keys (list): List of (server_name, key_id, source) triplets.
         Returns:
-            Dict mapping (server_name, key_id, source) triplets to dicts with
-            "ts_valid_until_ms" and "key_json" keys.
+            Deferred[dict[Tuple[str, str, str|None], list[dict]]]:
+                Dict mapping (server_name, key_id, source) triplets to lists of dicts
         """
 
         def _get_server_keys_json_txn(txn):
diff --git a/synapse/storage/registration.py b/synapse/storage/registration.py
index e30b86c346..643f7a3808 100644
--- a/synapse/storage/registration.py
+++ b/synapse/storage/registration.py
@@ -86,6 +86,26 @@ class RegistrationWorkerStore(SQLBaseStore):
             "get_user_by_access_token", self._query_for_auth, token
         )
 
+    @cachedInlineCallbacks()
+    def get_expiration_ts_for_user(self, user):
+        """Get the expiration timestamp for the account bearing a given user ID.
+
+        Args:
+            user (str): The ID of the user.
+        Returns:
+            defer.Deferred: None, if the account has no expiration timestamp,
+            otherwise int representation of the timestamp (as a number of
+            milliseconds since epoch).
+        """
+        res = yield self._simple_select_one_onecol(
+            table="account_validity",
+            keyvalues={"user_id": user.to_string()},
+            retcol="expiration_ts_ms",
+            allow_none=True,
+            desc="get_expiration_date_for_user",
+        )
+        defer.returnValue(res)
+
     @defer.inlineCallbacks
     def is_server_admin(self, user):
         res = yield self._simple_select_one_onecol(
@@ -425,6 +445,8 @@ class RegistrationStore(
             columns=["creation_ts"],
         )
 
+        self._account_validity = hs.config.account_validity
+
         # we no longer use refresh tokens, but it's possible that some people
         # might have a background update queued to build this index. Just
         # clear the background update.
@@ -561,6 +583,18 @@ class RegistrationStore(
                         "user_type": user_type,
                     },
                 )
+
+            if self._account_validity.enabled:
+                now_ms = self.clock.time_msec()
+                expiration_ts = now_ms + self._account_validity.period
+                self._simple_insert_txn(
+                    txn,
+                    "account_validity",
+                    values={
+                        "user_id": user_id,
+                        "expiration_ts_ms": expiration_ts,
+                    }
+                )
         except self.database_engine.module.IntegrityError:
             raise StoreError(400, "User ID already taken.", errcode=Codes.USER_IN_USE)
 
diff --git a/synapse/storage/schema/delta/13/v13.sql b/synapse/storage/schema/delta/13/v13.sql
index 5eb93b38b2..f8649e5d99 100644
--- a/synapse/storage/schema/delta/13/v13.sql
+++ b/synapse/storage/schema/delta/13/v13.sql
@@ -13,19 +13,7 @@
  * limitations under the License.
  */
 
-CREATE TABLE IF NOT EXISTS application_services(
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    url TEXT,
-    token TEXT,
-    hs_token TEXT,
-    sender TEXT,
-    UNIQUE(token)
-);
-
-CREATE TABLE IF NOT EXISTS application_services_regex(
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    as_id BIGINT UNSIGNED NOT NULL,
-    namespace INTEGER,  /* enum[room_id|room_alias|user_id] */
-    regex TEXT,
-    FOREIGN KEY(as_id) REFERENCES application_services(id)
-);
+/* We used to create a tables called application_services and
+ * application_services_regex, but these are no longer used and are removed in
+ * delta 54.
+ */
diff --git a/synapse/storage/schema/delta/14/upgrade_appservice_db.py b/synapse/storage/schema/delta/14/upgrade_appservice_db.py
deleted file mode 100644
index 4d725b92fe..0000000000
--- a/synapse/storage/schema/delta/14/upgrade_appservice_db.py
+++ /dev/null
@@ -1,42 +0,0 @@
-# Copyright 2015, 2016 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.
-
-import logging
-
-import simplejson as json
-
-logger = logging.getLogger(__name__)
-
-
-def run_create(cur, *args, **kwargs):
-    cur.execute("SELECT id, regex FROM application_services_regex")
-    for row in cur.fetchall():
-        try:
-            logger.debug("Checking %s..." % row[0])
-            json.loads(row[1])
-        except ValueError:
-            # row isn't in json, make it so.
-            string_regex = row[1]
-            new_regex = json.dumps({
-                "regex": string_regex,
-                "exclusive": True
-            })
-            cur.execute(
-                "UPDATE application_services_regex SET regex=? WHERE id=?",
-                (new_regex, row[0])
-            )
-
-
-def run_upgrade(*args, **kwargs):
-    pass
diff --git a/synapse/storage/schema/delta/16/unique_constraints.sql b/synapse/storage/schema/delta/16/unique_constraints.sql
index fecf11118c..5b8de52c33 100644
--- a/synapse/storage/schema/delta/16/unique_constraints.sql
+++ b/synapse/storage/schema/delta/16/unique_constraints.sql
@@ -18,14 +18,6 @@ DROP INDEX IF EXISTS room_memberships_event_id;
 CREATE UNIQUE INDEX room_memberships_event_id ON room_memberships(event_id);
 
 --
-DELETE FROM feedback WHERE rowid not in (
-    SELECT MIN(rowid) FROM feedback GROUP BY event_id
-);
-
-DROP INDEX IF EXISTS feedback_event_id;
-CREATE UNIQUE INDEX feedback_event_id ON feedback(event_id);
-
---
 DELETE FROM topics WHERE rowid not in (
     SELECT MIN(rowid) FROM topics GROUP BY event_id
 );
diff --git a/synapse/storage/schema/delta/24/stats_reporting.sql b/synapse/storage/schema/delta/24/stats_reporting.sql
index 5f508af7a9..acea7483bd 100644
--- a/synapse/storage/schema/delta/24/stats_reporting.sql
+++ b/synapse/storage/schema/delta/24/stats_reporting.sql
@@ -1,4 +1,4 @@
-/* Copyright 2015, 2016 OpenMarket Ltd
+/* Copyright 2019 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.
@@ -13,10 +13,6 @@
  * limitations under the License.
  */
 
--- Should only ever contain one row
-CREATE TABLE IF NOT EXISTS stats_reporting(
-  -- The stream ordering token which was most recently reported as stats
-  reported_stream_token INTEGER,
-  -- The time (seconds since epoch) stats were most recently reported
-  reported_time BIGINT
-);
+ /* We used to create a table called stats_reporting, but this is no longer
+ * used and is removed in delta 54.
+ */
\ No newline at end of file
diff --git a/synapse/storage/schema/delta/30/state_stream.sql b/synapse/storage/schema/delta/30/state_stream.sql
index 706fe1dcf4..e85699e82e 100644
--- a/synapse/storage/schema/delta/30/state_stream.sql
+++ b/synapse/storage/schema/delta/30/state_stream.sql
@@ -14,15 +14,10 @@
  */
 
 
-/**
- * The positions in the event stream_ordering when the current_state was
- * replaced by the state at the event.
+/* We used to create a table called current_state_resets, but this is no
+ * longer used and is removed in delta 54.
  */
 
-CREATE TABLE IF NOT EXISTS current_state_resets(
-    event_stream_ordering BIGINT PRIMARY KEY NOT NULL
-);
-
 /* The outlier events that have aquired a state group typically through
  * backfill. This is tracked separately to the events table, as assigning a
  * state group change the position of the existing event in the stream
diff --git a/synapse/storage/schema/delta/32/remove_indices.sql b/synapse/storage/schema/delta/32/remove_indices.sql
index f859be46a6..4219cdd06a 100644
--- a/synapse/storage/schema/delta/32/remove_indices.sql
+++ b/synapse/storage/schema/delta/32/remove_indices.sql
@@ -24,13 +24,9 @@ DROP INDEX IF EXISTS state_groups_id; -- Duplicate of PRIMARY KEY
 DROP INDEX IF EXISTS event_to_state_groups_id; -- Duplicate of PRIMARY KEY
 DROP INDEX IF EXISTS event_push_actions_room_id_event_id_user_id_profile_tag; -- Duplicate of UNIQUE CONSTRAINT
 
-DROP INDEX IF EXISTS event_destinations_id; -- Prefix of UNIQUE CONSTRAINT
 DROP INDEX IF EXISTS st_extrem_id; -- Prefix of UNIQUE CONSTRAINT
-DROP INDEX IF EXISTS event_content_hashes_id; -- Prefix of UNIQUE CONSTRAINT
 DROP INDEX IF EXISTS event_signatures_id; -- Prefix of UNIQUE CONSTRAINT
-DROP INDEX IF EXISTS event_edge_hashes_id; -- Prefix of UNIQUE CONSTRAINT
 DROP INDEX IF EXISTS redactions_event_id; -- Duplicate of UNIQUE CONSTRAINT
-DROP INDEX IF EXISTS room_hosts_room_id; -- Prefix of UNIQUE CONSTRAINT
 
 -- The following indices were unused
 DROP INDEX IF EXISTS remote_media_cache_thumbnails_media_id;
diff --git a/synapse/storage/schema/full_schemas/11/profiles.sql b/synapse/storage/schema/delta/54/account_validity.sql
index b314e6df75..57249262d7 100644
--- a/synapse/storage/schema/full_schemas/11/profiles.sql
+++ b/synapse/storage/schema/delta/54/account_validity.sql
@@ -1,4 +1,4 @@
-/* Copyright 2014-2016 OpenMarket Ltd
+/* Copyright 2019 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.
@@ -12,8 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-CREATE TABLE IF NOT EXISTS profiles(
-    user_id TEXT NOT NULL,
-    displayname TEXT,
-    avatar_url TEXT
+
+-- Track what users are in public rooms.
+CREATE TABLE IF NOT EXISTS account_validity (
+    user_id TEXT PRIMARY KEY,
+    expiration_ts_ms BIGINT NOT NULL
 );
diff --git a/synapse/storage/schema/delta/54/drop_legacy_tables.sql b/synapse/storage/schema/delta/54/drop_legacy_tables.sql
new file mode 100644
index 0000000000..dbbe682697
--- /dev/null
+++ b/synapse/storage/schema/delta/54/drop_legacy_tables.sql
@@ -0,0 +1,30 @@
+/* Copyright 2019 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.
+ */
+
+-- we need to do this first due to foreign constraints
+DROP TABLE IF EXISTS application_services_regex;
+
+DROP TABLE IF EXISTS application_services;
+DROP TABLE IF EXISTS transaction_id_to_pdu;
+DROP TABLE IF EXISTS stats_reporting;
+DROP TABLE IF EXISTS current_state_resets;
+DROP TABLE IF EXISTS event_content_hashes;
+DROP TABLE IF EXISTS event_destinations;
+DROP TABLE IF EXISTS event_edge_hashes;
+DROP TABLE IF EXISTS event_signatures;
+DROP TABLE IF EXISTS feedback;
+DROP TABLE IF EXISTS room_hosts;
+DROP TABLE IF EXISTS server_tls_certificates;
+DROP TABLE IF EXISTS state_forward_extremities;
diff --git a/synapse/storage/schema/full_schemas/11/event_edges.sql b/synapse/storage/schema/full_schemas/11/event_edges.sql
deleted file mode 100644
index bccd1c6f74..0000000000
--- a/synapse/storage/schema/full_schemas/11/event_edges.sql
+++ /dev/null
@@ -1,91 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-
-CREATE TABLE IF NOT EXISTS event_forward_extremities(
-    event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    UNIQUE (event_id, room_id)
-);
-
-CREATE INDEX ev_extrem_room ON event_forward_extremities(room_id);
-CREATE INDEX ev_extrem_id ON event_forward_extremities(event_id);
-
-
-CREATE TABLE IF NOT EXISTS event_backward_extremities(
-    event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    UNIQUE (event_id, room_id)
-);
-
-CREATE INDEX ev_b_extrem_room ON event_backward_extremities(room_id);
-CREATE INDEX ev_b_extrem_id ON event_backward_extremities(event_id);
-
-
-CREATE TABLE IF NOT EXISTS event_edges(
-    event_id TEXT NOT NULL,
-    prev_event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    -- We no longer insert prev_state into this table, so all new rows will have
-    -- is_state as false.
-    is_state BOOL NOT NULL,
-    UNIQUE (event_id, prev_event_id, room_id, is_state)
-);
-
-CREATE INDEX ev_edges_id ON event_edges(event_id);
-CREATE INDEX ev_edges_prev_id ON event_edges(prev_event_id);
-
-
-CREATE TABLE IF NOT EXISTS room_depth(
-    room_id TEXT NOT NULL,
-    min_depth INTEGER NOT NULL,
-    UNIQUE (room_id)
-);
-
-CREATE INDEX room_depth_room ON room_depth(room_id);
-
-
-create TABLE IF NOT EXISTS event_destinations(
-    event_id TEXT NOT NULL,
-    destination TEXT NOT NULL,
-    delivered_ts BIGINT DEFAULT 0, -- or 0 if not delivered
-    UNIQUE (event_id, destination)
-);
-
-CREATE INDEX event_destinations_id ON event_destinations(event_id);
-
-
-CREATE TABLE IF NOT EXISTS state_forward_extremities(
-    event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    type TEXT NOT NULL,
-    state_key TEXT NOT NULL,
-    UNIQUE (event_id, room_id)
-);
-
-CREATE INDEX st_extrem_keys ON state_forward_extremities(
-    room_id, type, state_key
-);
-CREATE INDEX st_extrem_id ON state_forward_extremities(event_id);
-
-
-CREATE TABLE IF NOT EXISTS event_auth(
-    event_id TEXT NOT NULL,
-    auth_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    UNIQUE (event_id, auth_id, room_id)
-);
-
-CREATE INDEX evauth_edges_id ON event_auth(event_id);
-CREATE INDEX evauth_edges_auth_id ON event_auth(auth_id);
diff --git a/synapse/storage/schema/full_schemas/11/event_signatures.sql b/synapse/storage/schema/full_schemas/11/event_signatures.sql
deleted file mode 100644
index 00ce85980e..0000000000
--- a/synapse/storage/schema/full_schemas/11/event_signatures.sql
+++ /dev/null
@@ -1,55 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-
-CREATE TABLE IF NOT EXISTS event_content_hashes (
-    event_id TEXT,
-    algorithm TEXT,
-    hash bytea,
-    UNIQUE (event_id, algorithm)
-);
-
-CREATE INDEX event_content_hashes_id ON event_content_hashes(event_id);
-
-
-CREATE TABLE IF NOT EXISTS event_reference_hashes (
-    event_id TEXT,
-    algorithm TEXT,
-    hash bytea,
-    UNIQUE (event_id, algorithm)
-);
-
-CREATE INDEX event_reference_hashes_id ON event_reference_hashes(event_id);
-
-
-CREATE TABLE IF NOT EXISTS event_signatures (
-    event_id TEXT,
-    signature_name TEXT,
-    key_id TEXT,
-    signature bytea,
-    UNIQUE (event_id, signature_name, key_id)
-);
-
-CREATE INDEX event_signatures_id ON event_signatures(event_id);
-
-
-CREATE TABLE IF NOT EXISTS event_edge_hashes(
-    event_id TEXT,
-    prev_event_id TEXT,
-    algorithm TEXT,
-    hash bytea,
-    UNIQUE (event_id, prev_event_id, algorithm)
-);
-
-CREATE INDEX event_edge_hashes_id ON event_edge_hashes(event_id);
diff --git a/synapse/storage/schema/full_schemas/11/im.sql b/synapse/storage/schema/full_schemas/11/im.sql
deleted file mode 100644
index dfbbf9fd54..0000000000
--- a/synapse/storage/schema/full_schemas/11/im.sql
+++ /dev/null
@@ -1,123 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-
-CREATE TABLE IF NOT EXISTS events(
-    stream_ordering INTEGER PRIMARY KEY AUTOINCREMENT,
-    topological_ordering BIGINT NOT NULL,
-    event_id TEXT NOT NULL,
-    type TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    content TEXT NOT NULL,
-    unrecognized_keys TEXT,
-    processed BOOL NOT NULL,
-    outlier BOOL NOT NULL,
-    depth BIGINT DEFAULT 0 NOT NULL,
-    UNIQUE (event_id)
-);
-
-CREATE INDEX events_stream_ordering ON events (stream_ordering);
-CREATE INDEX events_topological_ordering ON events (topological_ordering);
-CREATE INDEX events_room_id ON events (room_id);
-
-
-CREATE TABLE IF NOT EXISTS event_json(
-    event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    internal_metadata TEXT NOT NULL,
-    json TEXT NOT NULL,
-    UNIQUE (event_id)
-);
-
-CREATE INDEX event_json_room_id ON event_json(room_id);
-
-
-CREATE TABLE IF NOT EXISTS state_events(
-    event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    type TEXT NOT NULL,
-    state_key TEXT NOT NULL,
-    prev_state TEXT,
-    UNIQUE (event_id)
-);
-
-CREATE INDEX state_events_room_id ON state_events (room_id);
-CREATE INDEX state_events_type ON state_events (type);
-CREATE INDEX state_events_state_key ON state_events (state_key);
-
-
-CREATE TABLE IF NOT EXISTS current_state_events(
-    event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    type TEXT NOT NULL,
-    state_key TEXT NOT NULL,
-    UNIQUE (room_id, type, state_key)
-);
-
-CREATE INDEX curr_events_event_id ON current_state_events (event_id);
-CREATE INDEX current_state_events_room_id ON current_state_events (room_id);
-CREATE INDEX current_state_events_type ON current_state_events (type);
-CREATE INDEX current_state_events_state_key ON current_state_events (state_key);
-
-CREATE TABLE IF NOT EXISTS room_memberships(
-    event_id TEXT NOT NULL,
-    user_id TEXT NOT NULL,
-    sender TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    membership TEXT NOT NULL
-);
-
-CREATE INDEX room_memberships_event_id ON room_memberships (event_id);
-CREATE INDEX room_memberships_room_id ON room_memberships (room_id);
-CREATE INDEX room_memberships_user_id ON room_memberships (user_id);
-
-CREATE TABLE IF NOT EXISTS feedback(
-    event_id TEXT NOT NULL,
-    feedback_type TEXT,
-    target_event_id TEXT,
-    sender TEXT,
-    room_id TEXT
-);
-
-CREATE TABLE IF NOT EXISTS topics(
-    event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    topic TEXT NOT NULL
-);
-
-CREATE INDEX topics_event_id ON topics(event_id);
-CREATE INDEX topics_room_id ON topics(room_id);
-
-CREATE TABLE IF NOT EXISTS room_names(
-    event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    name TEXT NOT NULL
-);
-
-CREATE INDEX room_names_event_id ON room_names(event_id);
-CREATE INDEX room_names_room_id ON room_names(room_id);
-
-CREATE TABLE IF NOT EXISTS rooms(
-    room_id TEXT PRIMARY KEY NOT NULL,
-    is_public BOOL,
-    creator TEXT
-);
-
-CREATE TABLE IF NOT EXISTS room_hosts(
-    room_id TEXT NOT NULL,
-    host TEXT NOT NULL,
-    UNIQUE (room_id, host)
-);
-
-CREATE INDEX room_hosts_room_id ON room_hosts (room_id);
diff --git a/synapse/storage/schema/full_schemas/11/keys.sql b/synapse/storage/schema/full_schemas/11/keys.sql
deleted file mode 100644
index ca0ca1b694..0000000000
--- a/synapse/storage/schema/full_schemas/11/keys.sql
+++ /dev/null
@@ -1,31 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-CREATE TABLE IF NOT EXISTS server_tls_certificates(
-  server_name TEXT, -- Server name.
-  fingerprint TEXT, -- Certificate fingerprint.
-  from_server TEXT, -- Which key server the certificate was fetched from.
-  ts_added_ms BIGINT, -- When the certifcate was added.
-  tls_certificate bytea, -- DER encoded x509 certificate.
-  UNIQUE (server_name, fingerprint)
-);
-
-CREATE TABLE IF NOT EXISTS server_signature_keys(
-  server_name TEXT, -- Server name.
-  key_id TEXT, -- Key version.
-  from_server TEXT, -- Which key server the key was fetched form.
-  ts_added_ms BIGINT, -- When the key was added.
-  verify_key bytea, -- NACL verification key.
-  UNIQUE (server_name, key_id)
-);
diff --git a/synapse/storage/schema/full_schemas/11/media_repository.sql b/synapse/storage/schema/full_schemas/11/media_repository.sql
deleted file mode 100644
index 9c264d6ece..0000000000
--- a/synapse/storage/schema/full_schemas/11/media_repository.sql
+++ /dev/null
@@ -1,65 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-
-CREATE TABLE IF NOT EXISTS local_media_repository (
-    media_id TEXT, -- The id used to refer to the media.
-    media_type TEXT, -- The MIME-type of the media.
-    media_length INTEGER, -- Length of the media in bytes.
-    created_ts BIGINT, -- When the content was uploaded in ms.
-    upload_name TEXT, -- The name the media was uploaded with.
-    user_id TEXT, -- The user who uploaded the file.
-    UNIQUE (media_id)
-);
-
-CREATE TABLE IF NOT EXISTS local_media_repository_thumbnails (
-    media_id TEXT, -- The id used to refer to the media.
-    thumbnail_width INTEGER, -- The width of the thumbnail in pixels.
-    thumbnail_height INTEGER, -- The height of the thumbnail in pixels.
-    thumbnail_type TEXT, -- The MIME-type of the thumbnail.
-    thumbnail_method TEXT, -- The method used to make the thumbnail.
-    thumbnail_length INTEGER, -- The length of the thumbnail in bytes.
-    UNIQUE (
-        media_id, thumbnail_width, thumbnail_height, thumbnail_type
-    )
-);
-
-CREATE INDEX local_media_repository_thumbnails_media_id
-    ON local_media_repository_thumbnails (media_id);
-
-CREATE TABLE IF NOT EXISTS remote_media_cache (
-    media_origin TEXT, -- The remote HS the media came from.
-    media_id TEXT, -- The id used to refer to the media on that server.
-    media_type TEXT, -- The MIME-type of the media.
-    created_ts BIGINT, -- When the content was uploaded in ms.
-    upload_name TEXT, -- The name the media was uploaded with.
-    media_length INTEGER, -- Length of the media in bytes.
-    filesystem_id TEXT, -- The name used to store the media on disk.
-    UNIQUE (media_origin, media_id)
-);
-
-CREATE TABLE IF NOT EXISTS remote_media_cache_thumbnails (
-    media_origin TEXT, -- The remote HS the media came from.
-    media_id TEXT, -- The id used to refer to the media.
-    thumbnail_width INTEGER, -- The width of the thumbnail in pixels.
-    thumbnail_height INTEGER, -- The height of the thumbnail in pixels.
-    thumbnail_method TEXT, -- The method used to make the thumbnail
-    thumbnail_type TEXT, -- The MIME-type of the thumbnail.
-    thumbnail_length INTEGER, -- The length of the thumbnail in bytes.
-    filesystem_id TEXT, -- The name used to store the media on disk.
-    UNIQUE (
-        media_origin, media_id, thumbnail_width, thumbnail_height,
-        thumbnail_type
-     )
-);
diff --git a/synapse/storage/schema/full_schemas/11/presence.sql b/synapse/storage/schema/full_schemas/11/presence.sql
deleted file mode 100644
index 492725994c..0000000000
--- a/synapse/storage/schema/full_schemas/11/presence.sql
+++ /dev/null
@@ -1,35 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-CREATE TABLE IF NOT EXISTS presence(
-  user_id TEXT NOT NULL,
-  state VARCHAR(20),
-  status_msg TEXT,
-  mtime BIGINT -- miliseconds since last state change
-);
-
--- For each of /my/ users which possibly-remote users are allowed to see their
--- presence state
-CREATE TABLE IF NOT EXISTS presence_allow_inbound(
-  observed_user_id TEXT NOT NULL,
-  observer_user_id TEXT NOT NULL -- a UserID,
-);
-
--- For each of /my/ users (watcher), which possibly-remote users are they
--- watching?
-CREATE TABLE IF NOT EXISTS presence_list(
-  user_id TEXT NOT NULL,
-  observed_user_id TEXT NOT NULL, -- a UserID,
-  accepted BOOLEAN NOT NULL
-);
diff --git a/synapse/storage/schema/full_schemas/11/redactions.sql b/synapse/storage/schema/full_schemas/11/redactions.sql
deleted file mode 100644
index 318f0d9aa5..0000000000
--- a/synapse/storage/schema/full_schemas/11/redactions.sql
+++ /dev/null
@@ -1,22 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-CREATE TABLE IF NOT EXISTS redactions (
-    event_id TEXT NOT NULL,
-    redacts TEXT NOT NULL,
-    UNIQUE (event_id)
-);
-
-CREATE INDEX redactions_event_id ON redactions (event_id);
-CREATE INDEX redactions_redacts ON redactions (redacts);
diff --git a/synapse/storage/schema/full_schemas/11/room_aliases.sql b/synapse/storage/schema/full_schemas/11/room_aliases.sql
deleted file mode 100644
index 71a91f8ec9..0000000000
--- a/synapse/storage/schema/full_schemas/11/room_aliases.sql
+++ /dev/null
@@ -1,24 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-
-CREATE TABLE IF NOT EXISTS room_aliases(
-    room_alias TEXT NOT NULL,
-    room_id TEXT NOT NULL
-);
-
-CREATE TABLE IF NOT EXISTS room_alias_servers(
-    room_alias TEXT NOT NULL,
-    server TEXT NOT NULL
-);
diff --git a/synapse/storage/schema/full_schemas/11/state.sql b/synapse/storage/schema/full_schemas/11/state.sql
deleted file mode 100644
index b901e0f017..0000000000
--- a/synapse/storage/schema/full_schemas/11/state.sql
+++ /dev/null
@@ -1,40 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-
-CREATE TABLE IF NOT EXISTS state_groups(
-    id INTEGER PRIMARY KEY,
-    room_id TEXT NOT NULL,
-    event_id TEXT NOT NULL
-);
-
-CREATE TABLE IF NOT EXISTS state_groups_state(
-    state_group INTEGER NOT NULL,
-    room_id TEXT NOT NULL,
-    type TEXT NOT NULL,
-    state_key TEXT NOT NULL,
-    event_id TEXT NOT NULL
-);
-
-CREATE TABLE IF NOT EXISTS event_to_state_groups(
-    event_id TEXT NOT NULL,
-    state_group INTEGER NOT NULL,
-    UNIQUE (event_id)
-);
-
-CREATE INDEX state_groups_id ON state_groups(id);
-
-CREATE INDEX state_groups_state_id ON state_groups_state(state_group);
-CREATE INDEX state_groups_state_tuple ON state_groups_state(room_id, type, state_key);
-CREATE INDEX event_to_state_groups_id ON event_to_state_groups(event_id);
diff --git a/synapse/storage/schema/full_schemas/11/transactions.sql b/synapse/storage/schema/full_schemas/11/transactions.sql
deleted file mode 100644
index f6a058832e..0000000000
--- a/synapse/storage/schema/full_schemas/11/transactions.sql
+++ /dev/null
@@ -1,44 +0,0 @@
-/* Copyright 2014-2016 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.
- */
--- Stores what transaction ids we have received and what our response was
-CREATE TABLE IF NOT EXISTS received_transactions(
-    transaction_id TEXT,
-    origin TEXT,
-    ts BIGINT,
-    response_code INTEGER,
-    response_json bytea,
-    has_been_referenced SMALLINT DEFAULT 0, -- Whether thishas been referenced by a prev_tx
-    UNIQUE (transaction_id, origin)
-);
-
-CREATE INDEX transactions_have_ref ON received_transactions(origin, has_been_referenced);-- WHERE has_been_referenced = 0;
-
--- For sent transactions only.
-CREATE TABLE IF NOT EXISTS transaction_id_to_pdu(
-    transaction_id INTEGER,
-    destination TEXT,
-    pdu_id TEXT,
-    pdu_origin TEXT
-);
-
-CREATE INDEX transaction_id_to_pdu_tx ON transaction_id_to_pdu(transaction_id, destination);
-CREATE INDEX transaction_id_to_pdu_dest ON transaction_id_to_pdu(destination);
-
--- To track destination health
-CREATE TABLE IF NOT EXISTS destinations(
-    destination TEXT PRIMARY KEY,
-    retry_last_ts BIGINT,
-    retry_interval INTEGER
-);
diff --git a/synapse/storage/schema/full_schemas/11/users.sql b/synapse/storage/schema/full_schemas/11/users.sql
deleted file mode 100644
index 6c1d4c34a1..0000000000
--- a/synapse/storage/schema/full_schemas/11/users.sql
+++ /dev/null
@@ -1,43 +0,0 @@
-/* Copyright 2014-2016 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.
- */
-CREATE TABLE IF NOT EXISTS users(
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    name TEXT,
-    password_hash TEXT,
-    creation_ts BIGINT,
-    admin SMALLINT DEFAULT 0 NOT NULL,
-    UNIQUE(name)
-);
-
-CREATE TABLE IF NOT EXISTS access_tokens(
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    user_id TEXT NOT NULL,
-    device_id TEXT,
-    token TEXT NOT NULL,
-    last_used BIGINT,
-    UNIQUE(token)
-);
-
-CREATE TABLE IF NOT EXISTS user_ips (
-    user TEXT NOT NULL,
-    access_token TEXT NOT NULL,
-    device_id TEXT,
-    ip TEXT NOT NULL,
-    user_agent TEXT NOT NULL,
-    last_seen BIGINT NOT NULL,
-    UNIQUE (user, access_token, ip, user_agent)
-);
-
-CREATE INDEX user_ips_user ON user_ips(user);
diff --git a/synapse/storage/schema/full_schemas/16/application_services.sql b/synapse/storage/schema/full_schemas/16/application_services.sql
index aee0e68473..883fcd10b2 100644
--- a/synapse/storage/schema/full_schemas/16/application_services.sql
+++ b/synapse/storage/schema/full_schemas/16/application_services.sql
@@ -13,22 +13,11 @@
  * limitations under the License.
  */
 
-CREATE TABLE IF NOT EXISTS application_services(
-    id BIGINT PRIMARY KEY,
-    url TEXT,
-    token TEXT,
-    hs_token TEXT,
-    sender TEXT,
-    UNIQUE(token)
-);
+/* We used to create tables called application_services and
+ * application_services_regex, but these are no longer used and are removed in
+ * delta 54.
+ */
 
-CREATE TABLE IF NOT EXISTS application_services_regex(
-    id BIGINT PRIMARY KEY,
-    as_id BIGINT NOT NULL,
-    namespace INTEGER,  /* enum[room_id|room_alias|user_id] */
-    regex TEXT,
-    FOREIGN KEY(as_id) REFERENCES application_services(id)
-);
 
 CREATE TABLE IF NOT EXISTS application_services_state(
     as_id TEXT PRIMARY KEY,
diff --git a/synapse/storage/schema/full_schemas/16/event_edges.sql b/synapse/storage/schema/full_schemas/16/event_edges.sql
index 6b5a5a88fa..10ce2aa7a0 100644
--- a/synapse/storage/schema/full_schemas/16/event_edges.sql
+++ b/synapse/storage/schema/full_schemas/16/event_edges.sql
@@ -13,6 +13,11 @@
  * limitations under the License.
  */
 
+/* We used to create tables called event_destinations and
+ * state_forward_extremities, but these are no longer used and are removed in
+ * delta 54.
+ */
+
 CREATE TABLE IF NOT EXISTS event_forward_extremities(
     event_id TEXT NOT NULL,
     room_id TEXT NOT NULL,
@@ -54,31 +59,6 @@ CREATE TABLE IF NOT EXISTS room_depth(
 
 CREATE INDEX room_depth_room ON room_depth(room_id);
 
-
-create TABLE IF NOT EXISTS event_destinations(
-    event_id TEXT NOT NULL,
-    destination TEXT NOT NULL,
-    delivered_ts BIGINT DEFAULT 0, -- or 0 if not delivered
-    UNIQUE (event_id, destination)
-);
-
-CREATE INDEX event_destinations_id ON event_destinations(event_id);
-
-
-CREATE TABLE IF NOT EXISTS state_forward_extremities(
-    event_id TEXT NOT NULL,
-    room_id TEXT NOT NULL,
-    type TEXT NOT NULL,
-    state_key TEXT NOT NULL,
-    UNIQUE (event_id, room_id)
-);
-
-CREATE INDEX st_extrem_keys ON state_forward_extremities(
-    room_id, type, state_key
-);
-CREATE INDEX st_extrem_id ON state_forward_extremities(event_id);
-
-
 CREATE TABLE IF NOT EXISTS event_auth(
     event_id TEXT NOT NULL,
     auth_id TEXT NOT NULL,
diff --git a/synapse/storage/schema/full_schemas/16/event_signatures.sql b/synapse/storage/schema/full_schemas/16/event_signatures.sql
index 00ce85980e..95826da431 100644
--- a/synapse/storage/schema/full_schemas/16/event_signatures.sql
+++ b/synapse/storage/schema/full_schemas/16/event_signatures.sql
@@ -13,15 +13,9 @@
  * limitations under the License.
  */
 
-CREATE TABLE IF NOT EXISTS event_content_hashes (
-    event_id TEXT,
-    algorithm TEXT,
-    hash bytea,
-    UNIQUE (event_id, algorithm)
-);
-
-CREATE INDEX event_content_hashes_id ON event_content_hashes(event_id);
-
+ /* We used to create tables called event_content_hashes and event_edge_hashes,
+  * but these are no longer used and are removed in delta 54.
+  */
 
 CREATE TABLE IF NOT EXISTS event_reference_hashes (
     event_id TEXT,
@@ -42,14 +36,3 @@ CREATE TABLE IF NOT EXISTS event_signatures (
 );
 
 CREATE INDEX event_signatures_id ON event_signatures(event_id);
-
-
-CREATE TABLE IF NOT EXISTS event_edge_hashes(
-    event_id TEXT,
-    prev_event_id TEXT,
-    algorithm TEXT,
-    hash bytea,
-    UNIQUE (event_id, prev_event_id, algorithm)
-);
-
-CREATE INDEX event_edge_hashes_id ON event_edge_hashes(event_id);
diff --git a/synapse/storage/schema/full_schemas/16/im.sql b/synapse/storage/schema/full_schemas/16/im.sql
index 5f5cb8d01d..a1a2aa8e5b 100644
--- a/synapse/storage/schema/full_schemas/16/im.sql
+++ b/synapse/storage/schema/full_schemas/16/im.sql
@@ -13,6 +13,10 @@
  * limitations under the License.
  */
 
+/* We used to create tables called room_hosts and feedback,
+ * but these are no longer used and are removed in delta 54.
+ */
+
 CREATE TABLE IF NOT EXISTS events(
     stream_ordering INTEGER PRIMARY KEY,
     topological_ordering BIGINT NOT NULL,
@@ -91,15 +95,6 @@ CREATE TABLE IF NOT EXISTS room_memberships(
 CREATE INDEX room_memberships_room_id ON room_memberships (room_id);
 CREATE INDEX room_memberships_user_id ON room_memberships (user_id);
 
-CREATE TABLE IF NOT EXISTS feedback(
-    event_id TEXT NOT NULL,
-    feedback_type TEXT,
-    target_event_id TEXT,
-    sender TEXT,
-    room_id TEXT,
-    UNIQUE (event_id)
-);
-
 CREATE TABLE IF NOT EXISTS topics(
     event_id TEXT NOT NULL,
     room_id TEXT NOT NULL,
@@ -123,11 +118,3 @@ CREATE TABLE IF NOT EXISTS rooms(
     is_public BOOL,
     creator TEXT
 );
-
-CREATE TABLE IF NOT EXISTS room_hosts(
-    room_id TEXT NOT NULL,
-    host TEXT NOT NULL,
-    UNIQUE (room_id, host)
-);
-
-CREATE INDEX room_hosts_room_id ON room_hosts (room_id);
diff --git a/synapse/storage/schema/full_schemas/16/keys.sql b/synapse/storage/schema/full_schemas/16/keys.sql
index ca0ca1b694..11cdffdbb3 100644
--- a/synapse/storage/schema/full_schemas/16/keys.sql
+++ b/synapse/storage/schema/full_schemas/16/keys.sql
@@ -12,14 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-CREATE TABLE IF NOT EXISTS server_tls_certificates(
-  server_name TEXT, -- Server name.
-  fingerprint TEXT, -- Certificate fingerprint.
-  from_server TEXT, -- Which key server the certificate was fetched from.
-  ts_added_ms BIGINT, -- When the certifcate was added.
-  tls_certificate bytea, -- DER encoded x509 certificate.
-  UNIQUE (server_name, fingerprint)
-);
+
+-- we used to create a table called server_tls_certificates, but this is no
+-- longer used, and is removed in delta 54.
 
 CREATE TABLE IF NOT EXISTS server_signature_keys(
   server_name TEXT, -- Server name.
diff --git a/synapse/storage/schema/full_schemas/16/presence.sql b/synapse/storage/schema/full_schemas/16/presence.sql
index 0892c4cf96..01d2d8f833 100644
--- a/synapse/storage/schema/full_schemas/16/presence.sql
+++ b/synapse/storage/schema/full_schemas/16/presence.sql
@@ -28,5 +28,5 @@ CREATE TABLE IF NOT EXISTS presence_allow_inbound(
   UNIQUE (observed_user_id, observer_user_id)
 );
 
--- We used to create a table called presence_list, but this is no longer used 
+-- We used to create a table called presence_list, but this is no longer used
 -- and is removed in delta 54.
\ No newline at end of file