With --functional mode, each test method runs in its own process so
static caches are empty. This causes every method to recreate projects,
databases, collections, attributes, and indexes - flooding the serial
database worker queue and causing attribute polling timeouts.
File-based caching with file locks ensures resources are created once
per test class, then shared across all method processes. This restores
--functional mode and dramatically reduces worker queue load.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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