1 files changed, 30 insertions, 0 deletions
diff --git a/synapse/storage/schema/schema_version.sql b/synapse/storage/schema/schema_version.sql
new file mode 100644
index 0000000000..0431e2d051
--- /dev/null
+++ b/synapse/storage/schema/schema_version.sql
@@ -0,0 +1,30 @@
+/* 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 schema_version(
+    Lock char(1) NOT NULL DEFAULT 'X',  -- Makes sure this table only has one row.
+    version INTEGER NOT NULL,
+    upgraded BOOL NOT NULL,  -- Whether we reached this version from an upgrade or an initial schema.
+    CONSTRAINT schema_version_lock_x CHECK (Lock='X')
+    CONSTRAINT schema_version_lock_uniq UNIQUE (Lock)
+);
+
+CREATE TABLE IF NOT EXISTS applied_schema_deltas(
+    version INTEGER NOT NULL,
+    file TEXT NOT NULL,
+    CONSTRAINT schema_deltas_ver_file UNIQUE (version, file) ON CONFLICT IGNORE
+);
+
+CREATE INDEX IF NOT EXISTS schema_deltas_ver ON applied_schema_deltas(version);