diff --git a/schema/0000-init.sql b/schema/0000-init.sql
index d658398..52afd7e 100644
--- a/schema/0000-init.sql
+++ b/schema/0000-init.sql
@@ -180,9 +180,9 @@ BEGIN
     -- --------------------------------
     -- Transaction splits
 
-    CREATE SEQUENCE public.transaction_splits_id_seq
+    CREATE SEQUENCE IF NOT EXISTS public.transaction_splits_id_seq
       START WITH 1 INCREMENT BY 1;
-    CREATE TABLE public.transaction_splits (
+    CREATE TABLE IF NOT EXISTS public.transaction_splits (
 	id INTEGER PRIMARY KEY NOT NULL DEFAULT NEXTVAL('public.transaction_splits_id_seq'::regclass),
 
 	transaction INTEGER NOT NULL,
@@ -268,8 +268,46 @@ BEGIN
        GROUP BY t.id, a.name
        ORDER BY t.id DESC;
 
+    -- --------------------------------
+    -- Function to check schema version (used in migrations)
+
+    CREATE OR REPLACE FUNCTION brmbar_privileged.has_exact_schema_version(
+	    IN i_ver INTEGER
+    ) RETURNS INTEGER
+    VOLATILE  NOT LEAKPROOF  LANGUAGE plpgsql AS $x$
+    DECLARE
+	    v_ver INTEGER;
+    BEGIN
+	    SELECT ver INTO v_ver FROM brmbar_privileged.brmbar_schema;
+	    IF v_ver is NULL THEN
+	      RETURN false;
+	    ELSE
+	      RETURN v_ver = i_ver;
+	    END IF;
+    END;
+    $x$;
+
+    -- --------------------------------
+    -- 
+
+    CREATE OR REPLACE FUNCTION brmbar_privileged.upgrade_schema_version_to(
+	    IN i_ver INTEGER
+    ) RETURNS INTEGER
+    VOLATILE  NOT LEAKPROOF  LANGUAGE plpgsql AS $x$
+    DECLARE
+	    v_ver INTEGER;
+    BEGIN
+      SELECT ver FROM brmbar_privileged.brmbar_schema INTO v_ver;
+      IF v_ver=(i_ver-1) THEN
+        UPDATE brmbar_privileged.brmbar_schema SET ver = i_ver;
+      ELSE
+        RAISE EXCEPTION 'Invalid brmbar schema version transition (% -> %)', v_ver, i_ver;
+      END IF;
+    END;
+    $x$;
+
     -- Initialize version 1
-    -- INSERT INTO brmbar_privileged.brmbar_schema(ver) VALUES(1);
+    INSERT INTO brmbar_privileged.brmbar_schema(ver) VALUES(1);
   END IF;
 END;
 $$;