chore: import upstream snapshot with attribution

examples/forms-with-multiple-steps/database/finish.sql

@@ -0,0 +1,16 @@
+update partially_filled_users set age = :age
+where :age is not null and id = $id;
+
+insert into users (name, email, age)
+select name, email, age from partially_filled_users where id = $id;
+
+delete from partially_filled_users where id = $id;
+
+select
+    'alert' as component,
+    'Welcome, ' || name || '!' as title,
+    'You are user #' || id || '. [Create a new user](index.sql)' as description_md
+from users where id = last_insert_rowid();
+
+select 'list' as component, 'Existing users' as title, 'users' as value;
+select name as title, email as description from users;

examples/forms-with-multiple-steps/database/index.sql

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+-- create a new empty partially_filled_users row, returning its id
+insert into partially_filled_users default values
+returning
+  'redirect' as component,
+  'step_1.sql?id=' || id as link;

examples/forms-with-multiple-steps/database/step_1.sql

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+select 'form' as component, 'step_2.sql?id=' || $id as action;
+
+select 'name' as name, true as required, name as value
+from partially_filled_users where id = $id;

examples/forms-with-multiple-steps/database/step_2.sql

@@ -0,0 +1,9 @@
+update partially_filled_users set name = :name
+where :name is not null and id = $id;
+
+select 'form' as component, 'step_3.sql?id=' || $id as action;
+
+select 'email' as name, 'email' as type, true as required, email as value,
+    'you@example.com' as placeholder,
+    'Hey ' || name || '! what is your email?' as description
+from partially_filled_users where id = $id;

examples/forms-with-multiple-steps/database/step_3.sql

@@ -0,0 +1,8 @@
+update partially_filled_users set email = :email
+where :email is not null and id = $id;
+
+select 'form' as component, 'finish.sql?id=' || $id as action;
+
+select 'age' as name, 'number' as type, true as required, age as value,
+    'How old are you, ' || name || '?' as description
+from partially_filled_users where id = $id;