diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index a3ff995695..dfce5224a9 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -57,7 +57,7 @@ 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 = 14
+SCHEMA_VERSION = 15
 
 dir_path = os.path.abspath(os.path.dirname(__file__))
 
diff --git a/synapse/storage/appservice.py b/synapse/storage/appservice.py
index 4447c8a2e1..eec8fbd592 100644
--- a/synapse/storage/appservice.py
+++ b/synapse/storage/appservice.py
@@ -385,6 +385,8 @@ class ApplicationServiceTransactionStore(SQLBaseStore):
         Returns:
             AppServiceTransaction: A new transaction.
         """
+        # TODO: work out txn id (highest txn id for this service += 1)
+        # TODO: Within same db transaction, Insert new txn into txn table
         pass
 
     def complete_appservice_txn(self, txn_id, service):
@@ -398,6 +400,8 @@ class ApplicationServiceTransactionStore(SQLBaseStore):
             A Deferred which resolves to True if this transaction was completed
             successfully.
         """
+        # TODO: Set current txn_id for AS to 'txn_id'
+        # TODO: Delete txn contents
         pass
 
     def get_oldest_unsent_txn(self, service):
@@ -410,4 +414,6 @@ class ApplicationServiceTransactionStore(SQLBaseStore):
             A Deferred which resolves to an AppServiceTransaction or
             None.
         """
+        # TODO: Monotonically increasing txn ids, so just select the smallest
+        # one in the txns table (we delete them when they are sent)
         pass
diff --git a/synapse/storage/schema/delta/15/appservice_txns.sql b/synapse/storage/schema/delta/15/appservice_txns.sql
new file mode 100644
index 0000000000..11f0c799aa
--- /dev/null
+++ b/synapse/storage/schema/delta/15/appservice_txns.sql
@@ -0,0 +1,31 @@
+/* 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.
+ */
+
+CREATE TABLE IF NOT EXISTS application_services_state(
+    as_id INTEGER PRIMARY KEY,
+    state TEXT NOT NULL,
+    last_txn TEXT,
+    FOREIGN KEY(as_id) REFERENCES application_services(id)
+);
+
+CREATE TABLE IF NOT EXISTS application_services_txns(
+    as_id INTEGER NOT NULL,
+    txn_id INTEGER NOT NULL,
+    content TEXT NOT NULL,
+    UNIQUE(as_id, txn_id) ON CONFLICT ROLLBACK
+);
+
+
+