redis

从PG向Redis发送Pub/Sub消息

概览

扩展包名	版本	分类	许可证	语言
`pg_redis_pubsub`	`0.0.1`	FDW	MIT	C

ID	扩展名	Bin	Lib	Load	Create	Trust	Reloc	模式
8720	`redis`	否	是	否	是	否	是	-

相关扩展	`pgmq` `pgmb` `redis_fdw` `ulak` `pgq` `pgmqtt` `tcn` `pgmemcache` `pg_durable` `kafka_fdw`

版本

类型	仓库	版本	PG 大版本	包名	依赖
EXT	PIGSTY	`0.0.1`	1817161514	`pg_redis_pubsub`	-
RPM	PIGSTY	`0.0.1`	1817161514	`pg_redis_pubsub_$v`	-
DEB	PIGSTY	`0.0.1`	1817161514	`postgresql-$v-pg-redis-pubsub`	-

OS / PG	PG18	PG17	PG16	PG15	PG14
el8.x86_64	PIGSTY 0.0.1 el8.x86_64.pg18 : pg_redis_pubsub_18 pg_redis_pubsub_18-0.0.1-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.0.1 · 13.7KiB	PIGSTY 0.0.1 el8.x86_64.pg17 : pg_redis_pubsub_17 pg_redis_pubsub_17-0.0.1-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.0.1 · 13.7KiB	PIGSTY 0.0.1 el8.x86_64.pg16 : pg_redis_pubsub_16 pg_redis_pubsub_16-0.0.1-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.0.1 · 13.7KiB	PIGSTY 0.0.1 el8.x86_64.pg15 : pg_redis_pubsub_15 pg_redis_pubsub_15-0.0.1-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.0.1 · 13.8KiB	PIGSTY 0.0.1 el8.x86_64.pg14 : pg_redis_pubsub_14 pg_redis_pubsub_14-0.0.1-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.0.1 · 13.8KiB
el8.aarch64	PIGSTY 0.0.1 el8.aarch64.pg18 : pg_redis_pubsub_18 pg_redis_pubsub_18-0.0.1-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.0.1 · 14.0KiB	PIGSTY 0.0.1 el8.aarch64.pg17 : pg_redis_pubsub_17 pg_redis_pubsub_17-0.0.1-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.0.1 · 14.0KiB	PIGSTY 0.0.1 el8.aarch64.pg16 : pg_redis_pubsub_16 pg_redis_pubsub_16-0.0.1-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.0.1 · 14.0KiB	PIGSTY 0.0.1 el8.aarch64.pg15 : pg_redis_pubsub_15 pg_redis_pubsub_15-0.0.1-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.0.1 · 14.1KiB	PIGSTY 0.0.1 el8.aarch64.pg14 : pg_redis_pubsub_14 pg_redis_pubsub_14-0.0.1-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.0.1 · 14.1KiB
el9.x86_64	PIGSTY 0.0.1 el9.x86_64.pg18 : pg_redis_pubsub_18 pg_redis_pubsub_18-0.0.1-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.0.1 · 13.7KiB	PIGSTY 0.0.1 el9.x86_64.pg17 : pg_redis_pubsub_17 pg_redis_pubsub_17-0.0.1-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.0.1 · 13.7KiB	PIGSTY 0.0.1 el9.x86_64.pg16 : pg_redis_pubsub_16 pg_redis_pubsub_16-0.0.1-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.0.1 · 13.7KiB	PIGSTY 0.0.1 el9.x86_64.pg15 : pg_redis_pubsub_15 pg_redis_pubsub_15-0.0.1-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.0.1 · 13.8KiB	PIGSTY 0.0.1 el9.x86_64.pg14 : pg_redis_pubsub_14 pg_redis_pubsub_14-0.0.1-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.0.1 · 13.8KiB
el9.aarch64	PIGSTY 0.0.1 el9.aarch64.pg18 : pg_redis_pubsub_18 pg_redis_pubsub_18-0.0.1-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.0.1 · 13.7KiB	PIGSTY 0.0.1 el9.aarch64.pg17 : pg_redis_pubsub_17 pg_redis_pubsub_17-0.0.1-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.0.1 · 13.7KiB	PIGSTY 0.0.1 el9.aarch64.pg16 : pg_redis_pubsub_16 pg_redis_pubsub_16-0.0.1-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.0.1 · 13.7KiB	PIGSTY 0.0.1 el9.aarch64.pg15 : pg_redis_pubsub_15 pg_redis_pubsub_15-0.0.1-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.0.1 · 13.8KiB	PIGSTY 0.0.1 el9.aarch64.pg14 : pg_redis_pubsub_14 pg_redis_pubsub_14-0.0.1-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.0.1 · 13.8KiB
el10.x86_64	PIGSTY 0.0.1 el10.x86_64.pg18 : pg_redis_pubsub_18 pg_redis_pubsub_18-0.0.1-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.0.1 · 13.8KiB	PIGSTY 0.0.1 el10.x86_64.pg17 : pg_redis_pubsub_17 pg_redis_pubsub_17-0.0.1-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.0.1 · 13.8KiB	PIGSTY 0.0.1 el10.x86_64.pg16 : pg_redis_pubsub_16 pg_redis_pubsub_16-0.0.1-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.0.1 · 13.8KiB	PIGSTY 0.0.1 el10.x86_64.pg15 : pg_redis_pubsub_15 pg_redis_pubsub_15-0.0.1-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.0.1 · 13.9KiB	PIGSTY 0.0.1 el10.x86_64.pg14 : pg_redis_pubsub_14 pg_redis_pubsub_14-0.0.1-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.0.1 · 13.9KiB
el10.aarch64	PIGSTY 0.0.1 el10.aarch64.pg18 : pg_redis_pubsub_18 pg_redis_pubsub_18-0.0.1-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.0.1 · 13.9KiB	PIGSTY 0.0.1 el10.aarch64.pg17 : pg_redis_pubsub_17 pg_redis_pubsub_17-0.0.1-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.0.1 · 13.9KiB	PIGSTY 0.0.1 el10.aarch64.pg16 : pg_redis_pubsub_16 pg_redis_pubsub_16-0.0.1-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.0.1 · 13.9KiB	PIGSTY 0.0.1 el10.aarch64.pg15 : pg_redis_pubsub_15 pg_redis_pubsub_15-0.0.1-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.0.1 · 14.0KiB	PIGSTY 0.0.1 el10.aarch64.pg14 : pg_redis_pubsub_14 pg_redis_pubsub_14-0.0.1-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.0.1 · 14.0KiB
d12.x86_64	PIGSTY 0.0.1 d12.x86_64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_amd64.deb PIGSTY · 0.0.1 · 12.3KiB	PIGSTY 0.0.1 d12.x86_64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_amd64.deb PIGSTY · 0.0.1 · 12.2KiB	PIGSTY 0.0.1 d12.x86_64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_amd64.deb PIGSTY · 0.0.1 · 12.2KiB	PIGSTY 0.0.1 d12.x86_64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_amd64.deb PIGSTY · 0.0.1 · 12.3KiB	PIGSTY 0.0.1 d12.x86_64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_amd64.deb PIGSTY · 0.0.1 · 12.3KiB
d12.aarch64	PIGSTY 0.0.1 d12.aarch64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_arm64.deb PIGSTY · 0.0.1 · 12.3KiB	PIGSTY 0.0.1 d12.aarch64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_arm64.deb PIGSTY · 0.0.1 · 12.3KiB	PIGSTY 0.0.1 d12.aarch64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_arm64.deb PIGSTY · 0.0.1 · 12.3KiB	PIGSTY 0.0.1 d12.aarch64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_arm64.deb PIGSTY · 0.0.1 · 12.4KiB	PIGSTY 0.0.1 d12.aarch64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~bookworm_arm64.deb PIGSTY · 0.0.1 · 12.3KiB
d13.x86_64	PIGSTY 0.0.1 d13.x86_64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_amd64.deb PIGSTY · 0.0.1 · 12.2KiB	PIGSTY 0.0.1 d13.x86_64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_amd64.deb PIGSTY · 0.0.1 · 12.2KiB	PIGSTY 0.0.1 d13.x86_64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_amd64.deb PIGSTY · 0.0.1 · 12.2KiB	PIGSTY 0.0.1 d13.x86_64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_amd64.deb PIGSTY · 0.0.1 · 12.3KiB	PIGSTY 0.0.1 d13.x86_64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_amd64.deb PIGSTY · 0.0.1 · 12.3KiB
d13.aarch64	PIGSTY 0.0.1 d13.aarch64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_arm64.deb PIGSTY · 0.0.1 · 12.3KiB	PIGSTY 0.0.1 d13.aarch64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_arm64.deb PIGSTY · 0.0.1 · 12.3KiB	PIGSTY 0.0.1 d13.aarch64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_arm64.deb PIGSTY · 0.0.1 · 12.3KiB	PIGSTY 0.0.1 d13.aarch64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_arm64.deb PIGSTY · 0.0.1 · 12.4KiB	PIGSTY 0.0.1 d13.aarch64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~trixie_arm64.deb PIGSTY · 0.0.1 · 12.4KiB
u22.x86_64	PIGSTY 0.0.1 u22.x86_64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_amd64.deb PIGSTY · 0.0.1 · 12.6KiB	PIGSTY 0.0.1 u22.x86_64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_amd64.deb PIGSTY · 0.0.1 · 13.1KiB	PIGSTY 0.0.1 u22.x86_64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_amd64.deb PIGSTY · 0.0.1 · 13.1KiB	PIGSTY 0.0.1 u22.x86_64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_amd64.deb PIGSTY · 0.0.1 · 13.1KiB	PIGSTY 0.0.1 u22.x86_64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_amd64.deb PIGSTY · 0.0.1 · 13.1KiB
u22.aarch64	PIGSTY 0.0.1 u22.aarch64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_arm64.deb PIGSTY · 0.0.1 · 12.5KiB	PIGSTY 0.0.1 u22.aarch64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_arm64.deb PIGSTY · 0.0.1 · 13.0KiB	PIGSTY 0.0.1 u22.aarch64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_arm64.deb PIGSTY · 0.0.1 · 13.0KiB	PIGSTY 0.0.1 u22.aarch64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_arm64.deb PIGSTY · 0.0.1 · 13.0KiB	PIGSTY 0.0.1 u22.aarch64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~jammy_arm64.deb PIGSTY · 0.0.1 · 13.0KiB
u24.x86_64	PIGSTY 0.0.1 u24.x86_64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~noble_amd64.deb PIGSTY · 0.0.1 · 12.8KiB	PIGSTY 0.0.1 u24.x86_64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~noble_amd64.deb PIGSTY · 0.0.1 · 12.8KiB	PIGSTY 0.0.1 u24.x86_64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~noble_amd64.deb PIGSTY · 0.0.1 · 12.8KiB	PIGSTY 0.0.1 u24.x86_64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~noble_amd64.deb PIGSTY · 0.0.1 · 12.9KiB	PIGSTY 0.0.1 u24.x86_64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~noble_amd64.deb PIGSTY · 0.0.1 · 12.9KiB
u24.aarch64	PIGSTY 0.0.1 u24.aarch64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~noble_arm64.deb PIGSTY · 0.0.1 · 12.8KiB	PIGSTY 0.0.1 u24.aarch64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~noble_arm64.deb PIGSTY · 0.0.1 · 12.7KiB	PIGSTY 0.0.1 u24.aarch64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~noble_arm64.deb PIGSTY · 0.0.1 · 12.7KiB	PIGSTY 0.0.1 u24.aarch64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~noble_arm64.deb PIGSTY · 0.0.1 · 12.8KiB	PIGSTY 0.0.1 u24.aarch64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~noble_arm64.deb PIGSTY · 0.0.1 · 12.8KiB
u26.x86_64	PIGSTY 0.0.1 u26.x86_64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_amd64.deb PIGSTY · 0.0.1 · 12.9KiB	PIGSTY 0.0.1 u26.x86_64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_amd64.deb PIGSTY · 0.0.1 · 12.8KiB	PIGSTY 0.0.1 u26.x86_64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_amd64.deb PIGSTY · 0.0.1 · 12.8KiB	PIGSTY 0.0.1 u26.x86_64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_amd64.deb PIGSTY · 0.0.1 · 12.9KiB	PIGSTY 0.0.1 u26.x86_64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_amd64.deb PIGSTY · 0.0.1 · 12.8KiB
u26.aarch64	PIGSTY 0.0.1 u26.aarch64.pg18 : postgresql-18-pg-redis-pubsub postgresql-18-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_arm64.deb PIGSTY · 0.0.1 · 12.9KiB	PIGSTY 0.0.1 u26.aarch64.pg17 : postgresql-17-pg-redis-pubsub postgresql-17-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_arm64.deb PIGSTY · 0.0.1 · 12.9KiB	PIGSTY 0.0.1 u26.aarch64.pg16 : postgresql-16-pg-redis-pubsub postgresql-16-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_arm64.deb PIGSTY · 0.0.1 · 12.9KiB	PIGSTY 0.0.1 u26.aarch64.pg15 : postgresql-15-pg-redis-pubsub postgresql-15-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_arm64.deb PIGSTY · 0.0.1 · 13.0KiB	PIGSTY 0.0.1 u26.aarch64.pg14 : postgresql-14-pg-redis-pubsub postgresql-14-pg-redis-pubsub_0.0.1-1PIGSTY~resolute_arm64.deb PIGSTY · 0.0.1 · 12.9KiB

构建

您可以使用 pig build 命令构建 pg_redis_pubsub 扩展的 RPM / DEB 包：

BASH

pig build pkg pg_redis_pubsub         # 构建 RPM / DEB 包

安装

您可以直接安装 pg_redis_pubsub 扩展包的预置二进制包，首先确保 PGDG 和 PIGSTY 仓库已经添加并启用：

BASH

pig repo add pgsql -u          # 添加仓库并更新缓存

使用 pig 或者是 apt/yum/dnf 安装扩展：

安装

BASH

pig install pg_redis_pubsub;          # 当前活跃 PG 版本安装

pig

BASH

pig ext install -y pg_redis_pubsub -v 18  # PG 18
pig ext install -y pg_redis_pubsub -v 17  # PG 17
pig ext install -y pg_redis_pubsub -v 16  # PG 16
pig ext install -y pg_redis_pubsub -v 15  # PG 15
pig ext install -y pg_redis_pubsub -v 14  # PG 14

dnf

BASH

dnf install -y pg_redis_pubsub_18       # PG 18
dnf install -y pg_redis_pubsub_17       # PG 17
dnf install -y pg_redis_pubsub_16       # PG 16
dnf install -y pg_redis_pubsub_15       # PG 15
dnf install -y pg_redis_pubsub_14       # PG 14

apt

BASH

apt install -y postgresql-18-pg-redis-pubsub   # PG 18
apt install -y postgresql-17-pg-redis-pubsub   # PG 17
apt install -y postgresql-16-pg-redis-pubsub   # PG 16
apt install -y postgresql-15-pg-redis-pubsub   # PG 15
apt install -y postgresql-14-pg-redis-pubsub   # PG 14

创建扩展：

SQL

CREATE EXTENSION redis;

用法

redis: 从 PostgreSQL 直接向 Redis 发送发布/订阅消息

redis 扩展（pg_redis_pubsub）允许 PostgreSQL 向 Redis 发布/订阅频道发布消息。目前仅支持发布端。

配置

通过 GUC 变量设置 Redis 连接参数：

SQL

ALTER SYSTEM SET redis.host = '127.0.0.1';
ALTER SYSTEM SET redis.port = '6379';
SELECT pg_reload_conf();

也可以在数据库、角色或会话级别设置：

SQL

SET redis.host = '127.0.0.1';
SET redis.port = '6379';

基本用法

SQL

CREATE EXTENSION redis;

SELECT redis_connect();
SELECT redis_publish('mychannel', 'Hello World');
SELECT redis_disconnect();

可用函数

函数	描述
`redis_connect()`	使用 `redis.host` 和 `redis.port` 设置连接 Redis
`redis_disconnect()`	断开 Redis 连接
`redis_publish(channel text, message text)`	在指定频道发布消息
`redis_status()`	返回 Redis 客户端状态

注意：redis_publish 在没有连接时会自动连接。

触发器示例

当表被修改时向 Redis 发布变更事件：

SQL

CREATE OR REPLACE FUNCTION notify_changes()
RETURNS TRIGGER AS $$
BEGIN
  PERFORM redis_publish(
    'products:' || NEW.id::text,
    to_jsonb(NEW)::text
  );
  RETURN NULL;
END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER on_product_change
  AFTER INSERT OR UPDATE ON products
  FOR EACH ROW EXECUTE PROCEDURE notify_changes();

这允许监听 Redis 频道的外部订阅者实时响应 PostgreSQL 数据变更。

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