Revert "[ENG-2175] Redis clustering"

[adamsachs]

Reverts #7487.

This seems to have broken our nightly dev environment, so we're reverting temporarily to try and restore that environment while we understand and fix the issue.

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
fides-plus-nightly	Ignored		Feb 26, 2026 0:04am
fides-privacy-center	Ignored		Feb 26, 2026 0:04am

[greptile-apps]

Greptile Summary

This PR cleanly reverts #7487 which added Redis clustering support. The revert is necessary because the original changes broke the nightly dev environment.

Key changes reverted:

• Removed celery-redis-cluster dependency and downgraded redis from 7.2.0 to 3.5.3
• Removed Redis cluster configuration (cluster_enabled setting and cluster connection URL logic)
• Reverted FidesopsRedis from wrapper class back to Redis extension
• Removed Redis cluster nodes from docker-compose.yml
• Removed cluster-specific tests and CI workflows
• Reverted model methods from get_keys_by_prefix() back to cache.keys()

Note on PR size: This PR changes 16 files with 959 total line changes, which exceeds the repository's guideline of 15 files or 500 lines. However, this is an emergency revert to restore a broken environment, which justifies the exception. The revert is a clean git revert (matching the original commit's stats exactly: 828 deletions here vs 828 insertions in the original), making it low-risk despite the size.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk as it's a clean git revert
• This is a clean git revert that exactly undoes PR [ENG-2175] Redis clustering #7487. The line change statistics match perfectly (828 deletions here vs 828 insertions in the original commit), confirming this is a complete revert with no partial changes or cherry-picking. Reverts are inherently low-risk as they restore previously working code. The justification for the revert (broken dev environment) is clear and documented.
• No files require special attention - all changes are part of a clean git revert

Important Files Changed

Filename	Overview
src/fides/api/util/cache.py	reverted from wrapper class to Redis extension, removed cluster-aware methods
src/fides/config/redis_settings.py	removed cluster_enabled setting and get_cluster_connection_url method
src/fides/api/tasks/init.py	removed celery-redis-cluster import and cluster URL logic
pyproject.toml	downgraded redis from 7.2.0 to 3.5.3, removed celery-redis-cluster dependency
docker-compose.yml	removed 3 Redis cluster nodes and cluster init service
tests/ops/util/test_cache.py	removed cluster mode tests and cluster fixture

_{Last reviewed commit: c74004c}

[greptile-apps]

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