CREATE TABLE IF NOT EXISTS audit_logs (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    actor_id UUID REFERENCES users(id) ON DELETE SET NULL,
    actor_username TEXT NOT NULL DEFAULT '',
    action TEXT NOT NULL,
    resource_type TEXT NOT NULL DEFAULT '',
    resource_id TEXT NOT NULL DEFAULT '',
    ip_address TEXT NOT NULL DEFAULT '',
    user_agent TEXT NOT NULL DEFAULT '',
    details JSONB NOT NULL DEFAULT '{}'::jsonb,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS idx_audit_logs_created_at ON audit_logs(created_at DESC);
CREATE INDEX IF NOT EXISTS idx_audit_logs_action_created_at ON audit_logs(action, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_audit_logs_resource_created_at ON audit_logs(resource_type, resource_id, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_audit_logs_actor_created_at ON audit_logs(actor_id, created_at DESC);