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cpursley authored Jan 13, 2024
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# WalEx

Simple and Reliable Postgres [Change Data Capture
Simple and reliable Postgres [Change Data Capture
(CDC)](https://en.wikipedia.org/wiki/Change_data_capture) in Elixir.

WalEx allows you to listen to change events on your Postgres tables then send them on to [destinations](#destinations) or perform callback-like actions with the data via the [DSL](#elixir-dsl). For example:
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Send subscribed events to one or more webhooks. WalEx supports the [Standard Webhooks](https://www.standardwebhooks.com) spec via the [webhoox](https://github.com/cpursley/webhoox) library (which can also be used to receive webhooks in Elixir).

#### EventRelay (Recommended)
#### EventRelay

If you need something more durable and flexible than webhooks, check out [EventRelay](https://github.com/eventrelay/eventrelay). If you don't know Elixir and prefer a simple yaml configuration-based approach, you can use [eventsql](https://github.com/eventrelay/eventsql) (WalEx under the hood) to send events to EventRelay.
If you need something more durable and flexible than webhooks, check out [EventRelay](https://github.com/eventrelay/eventrelay).

In EventRelay, you'll need to create a topic matching what's in the WalEx destinations config. So, if your event_relay_topic is called _todos_ (usually this is the database name), then your topic name in EventRelay should be `todos`. Here's how to do it via grpcurl:

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