BEGIN;

CREATE TABLE stock_lot_document (
  id BIGSERIAL PRIMARY KEY,
  stock_lot_id BIGINT NOT NULL REFERENCES stock_lot(id) ON DELETE CASCADE,
  original_filename TEXT NOT NULL,
  stored_filename TEXT NOT NULL,
  mime_type TEXT NOT NULL,
  size_bytes BIGINT NOT NULL,
  comment TEXT,
  uploaded_by TEXT NOT NULL,
  uploaded_at TIMESTAMP NOT NULL DEFAULT NOW(),
  CONSTRAINT chk_stock_lot_document_size CHECK (size_bytes > 0 AND size_bytes <= 52428800)
);

CREATE INDEX idx_stock_lot_document_lot ON stock_lot_document(stock_lot_id, id);

COMMIT;