Use pug

sql/migrations/patches/20190925000000-updated-at/down.sql

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+DROP FUNCTION set_updated_timestamp;

sql/migrations/patches/20190925000000-updated-at/up.sql

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+CREATE OR REPLACE FUNCTION set_updated_timestamp()
+RETURNS TRIGGER AS $$
+BEGIN
+   IF row(NEW.*) IS DISTINCT FROM row(OLD.*) THEN
+      NEW.updated_at = now(); 
+      RETURN NEW;
+   ELSE
+      RETURN OLD;
+   END IF;
+END;
+$$ language 'plpgsql';

sql/migrations/patches/20190925000001-users/down.sql

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+DROP TABLE users;

sql/migrations/patches/20190925000001-users/up.sql

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+CREATE TABLE users (
+    id integer GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    email text NOT NULL UNIQUE,
+    encrypted_password text NOT NULL,
+    created_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP   
+);
+
+CREATE TRIGGER set_users_updated BEFORE UPDATE ON users FOR EACH ROW EXECUTE PROCEDURE set_updated_timestamp();