-- v4.2 — MercadoLibre sync queue for stock synchronization

CREATE TABLE IF NOT EXISTS meli_sync_queue (
    id SERIAL PRIMARY KEY,
    inventory_id INTEGER NOT NULL REFERENCES inventory(id),
    action VARCHAR(20) NOT NULL DEFAULT 'stock_update',
    status VARCHAR(20) NOT NULL DEFAULT 'pending',
    retry_count INTEGER DEFAULT 0,
    error_message TEXT,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    processed_at TIMESTAMPTZ
);

CREATE INDEX IF NOT EXISTS idx_meli_sync_pending ON meli_sync_queue(status, created_at) WHERE status = 'pending';