A simple, customisable table audit system for PostgreSQL implemented using triggers.

This is modified from https://github.com/hasura/audit-trigger, remove unsupported operator that introduced in Postgres 10 in order to running in Postgres 9.

This is based off https://github.com/2ndQuadrant/audit-trigger with the following changes

1. The row data is stored in jsonb.
2. Logs user information from hasura's graphql-engine (accessible by current_setting('hasura.user')).

Installation

Load audit.sql into the database where you want to set up auditing. You can do this via psql or any other tool that lets you execute sql on the database.

psql -h <db-host> -p <db-port> -U <db-user> -d <db> -f audit.sql --single-transaction

Setting up triggers

Run the following sql to setup audit on a table

select audit.audit_table('author');

For a table in a different schema name as follows:

select audit.audit_table('shipping.delivery');

This sets up triggers on the given table which logs any change (insert/update/delete) into the table audit.logged_actions.

select * from audit.logged_actions

Available options

The function audit.audit_table takes the following arguments:

argument	description
target_table	Table name, schema qualified if not on search_path
audit_rows	Record each row change, or only audit at a statement level
audit_query_text	Record the text of the client query that triggered the audit event?

Examples

Do not log changes for every row

select audit.audit_table('author', false);

Log changes for every row but don't log the sql statement

select audit.audit_table('author', true, false);