feat: single-file-example schema change

Author: tianzhou

singlefile/schema.sql

@@ -71,13 +71,12 @@ $$;
 CREATE TABLE IF NOT EXISTS users (
     id integer PRIMARY KEY,
     email text NOT NULL CHECK (email LIKE '%@%'),
-    name text NOT NULL
+    name text NOT NULL,
+    age integer CHECK (age >= 0),
 );
 
 COMMENT ON TABLE users IS 'User accounts';
 
-COMMENT ON COLUMN users.email IS 'User email address';
-
 --
 -- Name: idx_users_email; Type: INDEX; Schema: -; Owner: -
 --
@@ -117,7 +116,6 @@ CREATE OR REPLACE TRIGGER users_update_trigger
 CREATE TABLE IF NOT EXISTS orders (
     id integer PRIMARY KEY,
     user_id integer NOT NULL REFERENCES users(id),
-    status text DEFAULT 'pending' NOT NULL CHECK (status IN ('pending', 'completed')),
     amount numeric(10,2) DEFAULT 0.00
 );