The promise of digital mapping is to provide a shared and real-time view of the state of the underlying system.










pg_eventserv is a free and open-source component that helps fulfill the promise of real-time event modeling and shared views in PostgreSQL.
By connecting to PostgreSQL and listening on specified channels, pg_eventserv captures database notifications and forwards them to web clients, enabling real-time updates and synchronization of data displayed on maps or other web interfaces.











pg_eventserv does one thing and one thing only: take events generated by the PostgreSQL NOTIFY command and passes the payload along to waiting WebSockets clients.

pg_eventserv is free and easy to install and you can find it here: https://github.com/CrunchyData/pg_eventserv
What this means is that any client can watch for notifications and update as changes in the database happen.
Real-time data!
Here is a link to a Youtube video demonstration of pg_eventserv in action!
https://youtu.be/UakRtYmoWow 
I will let Paul Ramsey the creator of pg_eventserv explain all this in more detail in this episode. 
If you want to reach out to Paul the best place to do that is http://blog.cleverelephant.ca/ 
Or if you want to listen to previous episodes with Paul you might find these interesting
Raster in the database?
https://mapscaping.com/podcast/rasters-in-a-database/
Dynamic Vector Tiles Straight From The Database
https://mapscaping.com/podcast/dynamic-vector-tiles-straight-from-the-database/
Spatial SQL- GIS Without The GIS
https://mapscaping.com/podcast/spatial-sql-gis-without-the-gis/
 
also ...  If you are interested in spatial databases at scale ... you might find this episode interesting
https://mapscaping.com/podcast/distributing-geospatial-data/