chore: import upstream snapshot with attribution

tests/fixtures/sample.sql

@@ -0,0 +1,19 @@
+CREATE TABLE organizations (
+  id SERIAL PRIMARY KEY,
+  name TEXT NOT NULL
+);
+
+CREATE TABLE users (
+  id SERIAL PRIMARY KEY,
+  email TEXT NOT NULL,
+  org_id INT REFERENCES organizations(id)
+);
+
+CREATE VIEW active_users AS
+  SELECT * FROM users WHERE active = true;
+
+CREATE FUNCTION get_user(user_id INT) RETURNS users AS $$
+  BEGIN
+    RETURN QUERY SELECT * FROM users WHERE id = user_id;
+  END;
+$$ LANGUAGE plpgsql;