-- 空间拓扑与用电架构：客户用电回路表 customer_circuit
-- 语义：左树最末端节点（建筑 → 楼层 → 房间 → 回路），其中"楼层"为按 floor_no 聚合的虚拟层，不单独建表。
-- 幂等：CREATE TABLE IF NOT EXISTS / CREATE INDEX IF NOT EXISTS / COMMENT 均可重复执行。
-- 说明：rated_* 为配置额定值；实时电气量（电压/电流/功率/温度）本系统暂无采集数据源，不落库。
CREATE TABLE IF NOT EXISTS customer_circuit (
    id              BIGSERIAL PRIMARY KEY,
    customer_id     BIGINT       NOT NULL REFERENCES customer(id),
    building_id     BIGINT       NOT NULL REFERENCES customer_building(id),
    room_id         BIGINT       REFERENCES customer_room(id),
    floor_no        VARCHAR(16),
    circuit_code    VARCHAR(64)  NOT NULL UNIQUE,
    circuit_name    VARCHAR(128) NOT NULL,
    loop_spec       VARCHAR(128),
    load_type       VARCHAR(32),
    rated_voltage   VARCHAR(32),
    rated_current   VARCHAR(32),
    rated_power     NUMERIC(10,2),
    status          SMALLINT     NOT NULL DEFAULT 1,
    remark          TEXT,
    sort_order      INT          NOT NULL DEFAULT 0,
    created_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW()
);

COMMENT ON TABLE  customer_circuit IS '客户用电回路表（空间拓扑末端节点）';
COMMENT ON COLUMN customer_circuit.id            IS '自增主键';
COMMENT ON COLUMN customer_circuit.customer_id   IS '客户 ID（→ customer）';
COMMENT ON COLUMN customer_circuit.building_id   IS '所属建筑 ID（→ customer_building）';
COMMENT ON COLUMN customer_circuit.room_id       IS '所属房间 ID（→ customer_room，可空：公共区域回路不挂房间）';
COMMENT ON COLUMN customer_circuit.floor_no      IS '所在楼层（冗余，便于按楼层分组）';
COMMENT ON COLUMN customer_circuit.circuit_code  IS '回路编号（全局唯一，如 CIR-0219）';
COMMENT ON COLUMN customer_circuit.circuit_name  IS '回路名称';
COMMENT ON COLUMN customer_circuit.loop_spec     IS '回路规格（如 三相380V / 铜芯4×25+1×16）';
COMMENT ON COLUMN customer_circuit.load_type     IS '负荷类型（照明/动力/空调/插座等）';
COMMENT ON COLUMN customer_circuit.rated_voltage IS '额定电压（配置值）';
COMMENT ON COLUMN customer_circuit.rated_current IS '额定电流（配置值）';
COMMENT ON COLUMN customer_circuit.rated_power   IS '额定功率 kW（配置值）';
COMMENT ON COLUMN customer_circuit.status        IS '状态：1 正常 / 0 停用';
COMMENT ON COLUMN customer_circuit.remark        IS '备注';
COMMENT ON COLUMN customer_circuit.sort_order    IS '排序值';
COMMENT ON COLUMN customer_circuit.created_at    IS '创建时间';

CREATE INDEX IF NOT EXISTS idx_circuit_customer ON customer_circuit (customer_id);
CREATE INDEX IF NOT EXISTS idx_circuit_building ON customer_circuit (building_id);
CREATE INDEX IF NOT EXISTS idx_circuit_room     ON customer_circuit (room_id);