SCHEMA_SQL = """
CREATE TABLE IF NOT EXISTS users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    telegram_id TEXT UNIQUE NOT NULL,
    preferred_language TEXT DEFAULT 'en'
);

CREATE TABLE IF NOT EXISTS messages (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER NOT NULL,
    input_type TEXT NOT NULL,
    transcript_text TEXT,
    response_text TEXT,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY(user_id) REFERENCES users(id)
);

CREATE TABLE IF NOT EXISTS orders (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    order_id TEXT UNIQUE NOT NULL,
    amount REAL NOT NULL,
    status TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS payments (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    txn_id TEXT UNIQUE NOT NULL,
    order_id TEXT NOT NULL,
    mode TEXT NOT NULL,
    status TEXT NOT NULL,
    gateway TEXT NOT NULL,
    amount REAL NOT NULL
);

CREATE TABLE IF NOT EXISTS payment_links (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    link_id TEXT UNIQUE NOT NULL,
    amount REAL NOT NULL,
    customer_name TEXT,
    status TEXT NOT NULL DEFAULT 'ACTIVE',
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS refunds (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    refund_id TEXT UNIQUE NOT NULL,
    txn_id TEXT NOT NULL,
    amount REAL NOT NULL,
    status TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS settlements (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    payout_id TEXT UNIQUE NOT NULL,
    payout_date TEXT NOT NULL,
    gross REAL NOT NULL,
    fee REAL NOT NULL,
    net REAL NOT NULL
);

CREATE TABLE IF NOT EXISTS tool_audit (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    tool_name TEXT NOT NULL,
    args_json TEXT NOT NULL,
    result_json TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS pending_actions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    telegram_id TEXT UNIQUE NOT NULL,
    action_type TEXT NOT NULL,
    payload_json TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);
"""