diff --git a/migrations/0001-initial.sql b/migrations/0001-initial.sql
index afb47f4..c2b17fc 100644
--- a/migrations/0001-initial.sql
+++ b/migrations/0001-initial.sql
@@ -1,10 +1,11 @@
 CREATE TABLE cities
 (
-    id          uuid                     DEFAULT gen_random_uuid() NOT NULL,
-    name        varchar(50)                                        NOT NULL,
-    postal_code varchar(10),
-    created_at  timestamp WITH TIME ZONE DEFAULT NOW()             NOT NULL,
-    modified_at timestamp WITH TIME ZONE DEFAULT NOW()             NOT NULL
+    id              uuid                     DEFAULT gen_random_uuid() NOT NULL,
+    name            varchar(50)                                        NOT NULL,
+    postal_code     varchar(10),
+    created_at      timestamp WITH TIME ZONE DEFAULT NOW()             NOT NULL,
+    updated_at      timestamp WITH TIME ZONE DEFAULT NOW()             NOT NULL,
+    sa_orm_sentinel uuid
 );
 
 CREATE UNIQUE INDEX cities_id_uindex
@@ -12,15 +13,17 @@ CREATE UNIQUE INDEX cities_id_uindex
 
 CREATE TABLE users
 (
-    id          uuid                     DEFAULT gen_random_uuid() NOT NULL,
-    first_name  varchar(50),
-    last_name   varchar(50),
-    city_id     uuid
+    id              uuid                     DEFAULT gen_random_uuid() NOT NULL,
+    first_name      varchar(50),
+    last_name       varchar(50),
+    city_id         uuid
         CONSTRAINT users_cities_id_fk
             REFERENCES cities (),
-    created_at  timestamp WITH TIME ZONE DEFAULT NOW()             NOT NULL,
-    modified_at timestamp WITH TIME ZONE DEFAULT NOW()             NOT NULL
+    created_at      timestamp WITH TIME ZONE DEFAULT NOW()             NOT NULL,
+    updated_at      timestamp WITH TIME ZONE DEFAULT NOW()             NOT NULL,
+    sa_orm_sentinel uuid
 );
 
 CREATE UNIQUE INDEX users_id_uindex
     ON users (id);
+