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CREATE TABLE IF NOT EXISTS users (
  id TEXT PRIMARY KEY,
  name TEXT,
  os_type TEXT,
  vocabulary_level TEXT DEFAULT 'basic',
  accessibility_needs TEXT DEFAULT '[]',
  comfort_level INTEGER DEFAULT 1,
  onboarded INTEGER DEFAULT 0,
  created_at TEXT DEFAULT (datetime('now')),
  updated_at TEXT DEFAULT (datetime('now'))
);

CREATE TABLE IF NOT EXISTS conversations (
  id TEXT PRIMARY KEY,
  user_id TEXT NOT NULL,
  task_type TEXT,
  status TEXT DEFAULT 'active',
  context_summary TEXT,
  started_at TEXT DEFAULT (datetime('now')),
  ended_at TEXT,
  FOREIGN KEY (user_id) REFERENCES users(id)
);

CREATE TABLE IF NOT EXISTS messages (
  id TEXT PRIMARY KEY,
  conversation_id TEXT NOT NULL,
  role TEXT NOT NULL,
  body TEXT NOT NULL,
  created_at TEXT DEFAULT (datetime('now')),
  FOREIGN KEY (conversation_id) REFERENCES conversations(id)
);

CREATE TABLE IF NOT EXISTS step_sequences (
  id TEXT PRIMARY KEY,
  conversation_id TEXT NOT NULL,
  steps TEXT NOT NULL,
  current_index INTEGER DEFAULT 0,
  completed INTEGER DEFAULT 0,
  FOREIGN KEY (conversation_id) REFERENCES conversations(id)
);

CREATE TABLE IF NOT EXISTS skill_events (
  id TEXT PRIMARY KEY,
  user_id TEXT NOT NULL,
  skill_name TEXT NOT NULL,
  status TEXT DEFAULT 'started',
  practiced_at TEXT DEFAULT (datetime('now')),
  FOREIGN KEY (user_id) REFERENCES users(id)
);

CREATE TABLE IF NOT EXISTS safety_events (
  id TEXT PRIMARY KEY,
  user_id TEXT NOT NULL,
  event_type TEXT NOT NULL,
  trigger_text TEXT,
  created_at TEXT DEFAULT (datetime('now')),
  FOREIGN KEY (user_id) REFERENCES users(id)
);

CREATE TABLE IF NOT EXISTS user_notes (
  id TEXT PRIMARY KEY,
  user_id TEXT NOT NULL,
  title TEXT NOT NULL,
  content TEXT NOT NULL,
  created_at TEXT DEFAULT (datetime('now')),
  FOREIGN KEY (user_id) REFERENCES users(id)
);