chore: import upstream snapshot with attribution

examples/microsoft sql server advanced forms/sqlpage/mssql-migrations/0001_db_init.sql

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+create table users (
+    id int primary key IDENTITY(1,1),
+    name varchar(255) not null
+);
+
+create table groups (
+    id int primary key IDENTITY(1,1),
+    name varchar(255) not null
+);
+
+create table group_members (
+    group_id int not null,
+    user_id int not null,
+    constraint PK_group_members primary key (group_id, user_id),
+    constraint FK_group_members_groups foreign key (group_id) references groups (id),
+    constraint FK_group_members_users foreign key (user_id) references users (id)
+);
+
+CREATE TABLE questions(
+    id INT PRIMARY KEY IDENTITY(1,1),
+    question_text TEXT
+);
+
+CREATE TABLE survey_answers(
+    id INT PRIMARY KEY IDENTITY(1,1),
+    question_id INT,
+    answer TEXT,
+    timestamp DATETIME DEFAULT GETDATE(),
+    CONSTRAINT FK_survey_answers_questions FOREIGN KEY (question_id) REFERENCES questions(id)
+);
+
+INSERT INTO questions(question_text) VALUES
+    ('What is your name?'),
+    ('What is your age?'),
+    ('What is your favorite color?');

examples/microsoft sql server advanced forms/sqlpage/mssql-migrations/README.md

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+# Migrations for Microsoft SQL Server
+
+This folder contains the migrations for the Microsoft SQL Server example.
+
+At the time of writing, SQLPage does not support applying migrations for Microsoft SQL Server
+automatically, so we need to apply them manually.
+
+We write the migrations in a folder called `mssql-migrations`, instead of the usual `migrations`
+folder, and we use the `sqlcmd` tool to apply them.
+
+See [how it is done in the docker-compose file](../../docker-compose.yml).