refactor(database): 补全客户管理模块表结构与索引

新增客户业务编号、业务员关联字段，补全updated_at列和更新触发器，优化索引命名与新增必要索引，新增增量迁移脚本

database/db_init.sql

@@ -190,6 +190,7 @@ CREATE INDEX idx_oplog_time ON sys_operation_log (created_at);
 DROP TABLE IF EXISTS customer CASCADE;
 CREATE TABLE customer (
     id              BIGSERIAL PRIMARY KEY,
+    customer_no     VARCHAR(64)  NOT NULL UNIQUE,
     customer_name   VARCHAR(128) NOT NULL,
     province        VARCHAR(64),
     city            VARCHAR(64),
@@ -201,11 +202,13 @@ CREATE TABLE customer (
     fax             VARCHAR(20),
     customer_level  VARCHAR(32),
     status          SMALLINT     NOT NULL DEFAULT 1,
+    salesman_id     BIGINT       REFERENCES sys_user(id),
     created_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
     updated_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW()
 );
 COMMENT ON TABLE  customer IS '客户信息表';
 COMMENT ON COLUMN customer.id              IS '自增主键';
+COMMENT ON COLUMN customer.customer_no     IS '客户业务编号（KH+YYYYMMDD+3位序号）';
 COMMENT ON COLUMN customer.customer_name   IS '客户名称';
 COMMENT ON COLUMN customer.province        IS '省';
 COMMENT ON COLUMN customer.city            IS '市';
@@ -217,10 +220,13 @@ COMMENT ON COLUMN customer.postal_code     IS '邮编';
 COMMENT ON COLUMN customer.fax             IS '传真';
 COMMENT ON COLUMN customer.customer_level  IS '客户级别（学校/医院等）';
 COMMENT ON COLUMN customer.status           IS '状态：1意向 2签约 3运维中 4终止';
+COMMENT ON COLUMN customer.salesman_id      IS '负责业务员（→ sys_user.id）';
 COMMENT ON COLUMN customer.created_at       IS '创建时间';
 COMMENT ON COLUMN customer.updated_at       IS '更新时间';
-CREATE INDEX idx_customer_name   ON customer (customer_name);
-CREATE INDEX idx_customer_region ON customer (province, city, district);
+CREATE INDEX idx_customer_name     ON customer (customer_name);
+CREATE INDEX idx_customer_salesman ON customer (salesman_id);
+CREATE INDEX idx_customer_status   ON customer (status);
+CREATE INDEX idx_customer_region   ON customer (province, city, district);
 CREATE TRIGGER trg_customer_updated_at BEFORE UPDATE ON customer
     FOR EACH ROW EXECUTE FUNCTION trigger_set_updated_at();
 
@@ -233,7 +239,8 @@ CREATE TABLE customer_department (
     contact_person  VARCHAR(64),
     contact_phone   VARCHAR(20),
     function_desc   TEXT,
-    created_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW()
+    created_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW()
 );
 COMMENT ON TABLE  customer_department IS '客户部门信息表';
 COMMENT ON COLUMN customer_department.id              IS '自增主键';
@@ -243,7 +250,10 @@ COMMENT ON COLUMN customer_department.contact_person  IS '联系人';
 COMMENT ON COLUMN customer_department.contact_phone   IS '电话';
 COMMENT ON COLUMN customer_department.function_desc   IS '职能';
 COMMENT ON COLUMN customer_department.created_at      IS '创建时间';
-CREATE INDEX idx_cust_dept_customer ON customer_department (customer_id);
+COMMENT ON COLUMN customer_department.updated_at      IS '更新时间';
+CREATE INDEX idx_dept_customer ON customer_department (customer_id);
+CREATE TRIGGER trg_customer_department_updated_at BEFORE UPDATE ON customer_department
+    FOR EACH ROW EXECUTE FUNCTION trigger_set_updated_at();
 
 -- 10. 客户拜访信息表
 DROP TABLE IF EXISTS customer_visit CASCADE;
@@ -362,7 +372,8 @@ CREATE TABLE customer_account (
     wx_openid       VARCHAR(128),
     status          SMALLINT     NOT NULL DEFAULT 1,
     last_login_at   TIMESTAMPTZ,
-    created_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW()
+    created_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW()
 );
 COMMENT ON TABLE  customer_account IS '客户访问账号表（小程序登录）';
 COMMENT ON COLUMN customer_account.id             IS '自增主键';
@@ -373,7 +384,11 @@ COMMENT ON COLUMN customer_account.wx_openid      IS '微信 openid';
 COMMENT ON COLUMN customer_account.status         IS '状态：1启用 0禁用';
 COMMENT ON COLUMN customer_account.last_login_at  IS '最后登录时间';
 COMMENT ON COLUMN customer_account.created_at     IS '创建时间';
-CREATE UNIQUE INDEX idx_cust_account_phone ON customer_account (phone);
+COMMENT ON COLUMN customer_account.updated_at     IS '更新时间';
+CREATE INDEX        idx_account_customer ON customer_account (customer_id);
+CREATE UNIQUE INDEX uk_account_phone      ON customer_account (phone);
+CREATE TRIGGER trg_customer_account_updated_at BEFORE UPDATE ON customer_account
+    FOR EACH ROW EXECUTE FUNCTION trigger_set_updated_at();
 
 -- ============================================================
 -- 三、智电设备域（1 张表）