Understand the core structure behind Pubflow + Flowless

PostgreSQL dialect

-- PostgreSQL migration helper
-- Source style: pubflow flowless core (portable SQL-first)

CREATE TABLE IF NOT EXISTS users (
  id TEXT PRIMARY KEY,
  name TEXT,
  last_name TEXT,
  email TEXT NOT NULL UNIQUE,
  user_type TEXT NOT NULL DEFAULT 'customer',
  picture TEXT,
  user_name TEXT UNIQUE,
  password_hash TEXT,
  is_verified BOOLEAN NOT NULL DEFAULT FALSE,
  phone TEXT UNIQUE,
  two_factor BOOLEAN NOT NULL DEFAULT FALSE,
  lang TEXT,
  metadata JSONB,

  -- Enhanced profile
  mobile TEXT,
  tmz TEXT,
  bio TEXT,
  dob TEXT,
  recovery_email TEXT,
  display_name TEXT,
  first_time BOOLEAN NOT NULL DEFAULT TRUE,
  deleted_at TEXT,
  deletion_reason TEXT,
  gender TEXT,
  reference_id TEXT,

  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);
CREATE INDEX IF NOT EXISTS idx_users_user_name ON users(user_name);
CREATE INDEX IF NOT EXISTS idx_users_user_type ON users(user_type);

-- Optional upsert example
INSERT INTO users (id, email, name, user_type, lang) VALUES ('user_1', 'dev@pubflow.com', 'Dev', 'customer', 'en')
ON CONFLICT (id) DO UPDATE SET updated_at = CURRENT_TIMESTAMP;