Slushi cache

A Drupal database cache backend where permanent is really only semi-permanent.

If you're using a database based cache backend and seeing tables like {cache_render} and {cache_dynamic_page_cache} grow over time, then this might be the module for you.

Installation

Download and enable the module.

Configuration

In your settings.php customise the lifetime like so:

$settings['slushi_cache_melt_time'] = 86400;
// Setup the bins where you want permanent entries to melt.
$settings['cache']['bins']['render'] = 'cache.backend.slushi';
$settings['cache']['bins']['dynamic_page_cache'] = 'cache.backend.slushi';

Where the lifetime is the actual maximum permanent age in seconds.

You can find the cache bin names in your core.services.yml.

This module will be redundant on Drupal core > 8.4.0 as #2526150: Database cache bins allow unlimited growth: cache DB tables of gigabytes! is in core.