CREATE TABLE IF NOT EXISTS settings (
    id BIGSERIAL PRIMARY KEY,
    tenant_id VARCHAR(36) NOT NULL DEFAULT '',
    key VARCHAR(128) NOT NULL,
    value TEXT,
    type VARCHAR(16) NOT NULL DEFAULT 'string',
    scope VARCHAR(16) NOT NULL DEFAULT 'tenant',
    updated_by BIGINT NOT NULL DEFAULT 0,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_tenant_key ON settings(tenant_id, key);