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Not quite an answer but this helped with the headache of debugging deadlocks for our team https://github.com/sasha-s/go-deadlock Its a drop in replacement and will error out when it detects deadlocks.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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Use Change Data Capture techniques to synchronize your replicas. This tool may help you if you are using PostgreSQL https://github.com/rueian/pgcapture
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rueidis
Discontinued A fast Golang Redis client that supports Client Side Caching, Auto Pipelining, Generics OM, RedisJSON, RedisBloom, RediSearch, etc. [Moved to: https://github.com/redis/rueidis] (by rueian)
Use redis+client-side caching to implement your replicas. This can help you: https://github.com/rueian/rueidis