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10-word summary:
Cloudflare database error caused oversized file, crashing proxies and breaking services.
50-word summary:
A database permissions change made Cloudflare’s ClickHouse queries return duplicates, doubling a bot-management feature file. The oversized file exceeded proxy limits, causing widespread crashes and global 5xx errors. Many services, including authentication and Workers KV, failed. Cloudflare halted the bad file, restored a clean version, and restarted systems.