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Databases: primary/replica Repository: main branch CI/CD: server/agent

These are all fairly common terms I see or use for these scenarios.

There are a other terms you could use though in different systems that make sense.

Master: main/primary/broker Slave: agent/worker/replica/node

Bust out a thesaurus. Ace is apparently close to master. I kinda like that word. Ace of database.

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