Reload the post cache when updating.

Instead of deleting the cache when a post is updated (may harm a busy site), preload it (maybe in background) when updating.

Instead of deleting and then regenerating the cache (which leaves the page uncached for a small amount of time), preload the new cache in a temporary file then replace the older (so uncached time is 0)

Start by tracing how post updates currently delete and regenerate cached pages, then inspect the cache-writing and replacement paths. Define the preload and temporary-file behavior, including how background regeneration and replacement avoid an uncached interval. Done means updated posts replace the existing cache without first deleting it and busy-site behavior is preserved.

Written by the indexing model from the issue text.