-- org_gas_station：可燃气体站主表。identity 由应用生成 UUID V7，禁止自增主键。
CREATE TABLE IF NOT EXISTS org_gas_station (
  identity uuid PRIMARY KEY,
  station_code varchar(32) NOT NULL UNIQUE,
  name varchar(128) NOT NULL,
  principal varchar(64) NOT NULL,
  service_area varchar(128) NOT NULL,
  created_at timestamptz NOT NULL,
  updated_at timestamptz NOT NULL,
  created_by_identity uuid,
  updated_by_identity uuid,
  status varchar(32) NOT NULL DEFAULT 'draft',
  version integer NOT NULL DEFAULT 1
);

COMMENT ON TABLE org_gas_station IS '可燃气体站主表';
COMMENT ON COLUMN org_gas_station.identity IS '主键，应用生成的 UUID V7';
COMMENT ON COLUMN org_gas_station.station_code IS '气站全局唯一业务编码';
COMMENT ON COLUMN org_gas_station.name IS '气站名称';
COMMENT ON COLUMN org_gas_station.principal IS '气站负责人姓名';
COMMENT ON COLUMN org_gas_station.service_area IS '气站授权服务区域';
COMMENT ON COLUMN org_gas_station.created_at IS '记录创建时间，UTC';
COMMENT ON COLUMN org_gas_station.updated_at IS '记录更新时间，UTC';
COMMENT ON COLUMN org_gas_station.created_by_identity IS '创建人 identity';
COMMENT ON COLUMN org_gas_station.updated_by_identity IS '更新人 identity';
COMMENT ON COLUMN org_gas_station.status IS '状态：draft、enabled、frozen、archived';
COMMENT ON COLUMN org_gas_station.version IS '乐观锁版本';