CREATE TABLE "buyer_signatures" (
	"id" integer PRIMARY KEY GENERATED ALWAYS AS IDENTITY (sequence name "buyer_signatures_id_seq" INCREMENT BY 1 MINVALUE 1 MAXVALUE 2147483647 START WITH 1 CACHE 1),
	"name" varchar(255) DEFAULT '삼성중공업' NOT NULL,
	"image_url" text NOT NULL,
	"data_url" text,
	"mime_type" varchar(100),
	"file_size" integer,
	"is_active" boolean DEFAULT true,
	"created_at" timestamp DEFAULT now() NOT NULL,
	"updated_at" timestamp DEFAULT now() NOT NULL
);