Put shared contracts in a dedicated `libs/contracts` package within the monorepo: DTOs, interfaces, event schemas, and `.proto` files. Each service imports only from that package, never from a sibling service's source tree. Version messages semantically and preserve existing field types; add optional fields for compatible evolution instead of changing a field in place. Generate gRPC clients/types from the versioned proto where appropriate, apply validation at each service boundary, and test c...
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Put shared contracts in a dedicated `libs/contracts` package within the monorepo: DTOs, interfaces, event schemas, and `.proto` files. Each service imports only from that package, never from a sibling service's source tree.
Version messages semantically and preserve existing field types; add optional fields for compatible evolution instead of changing a field in place. Generate gRPC clients/types from the versioned proto where appropriate, apply validation at each service boundary, and test consumer compatibility during contract changes.
