CREATE TABLE users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    username TEXT NOT NULL UNIQUE,
    password_hash TEXT NOT NULL,
    is_admin INTEGER NOT NULL DEFAULT 0,
    totp_secret TEXT DEFAULT '',
    totp_enabled INTEGER NOT NULL DEFAULT 0,
    created_at INTEGER NOT NULL,
    updated_at INTEGER NOT NULL
);

CREATE TABLE sessions (
    id TEXT PRIMARY KEY,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    created_at INTEGER NOT NULL,
    expires_at INTEGER NOT NULL
);
CREATE INDEX idx_sessions_user ON sessions(user_id);
CREATE INDEX idx_sessions_expires ON sessions(expires_at);

CREATE TABLE api_tokens (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    key_hash TEXT NOT NULL,
    key_prefix TEXT NOT NULL,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    rate_limit_rpm INTEGER DEFAULT 60,
    daily_budget_usd REAL DEFAULT 0,
    created_at INTEGER NOT NULL,
    last_used_at INTEGER DEFAULT 0
);
CREATE UNIQUE INDEX idx_api_tokens_hash ON api_tokens(key_hash);
CREATE INDEX idx_api_tokens_user ON api_tokens(user_id);