Tiered Storage

Thermocline separates operational writes (hot tier) from long-term cold storage execution, with federated query merge when data spans both.

Policy Commands

Policy command surface in gateway:

• thermoclineSetPolicy
• thermoclineGetPolicy
• thermoclineListPolicies
• thermoclineDeletePolicy
• thermoclineValidatePolicy

Runtime Components

• Controller: archival/backup/lifecycle orchestration
• Coordinator: tier routing and merge
• Storage Engine: hot persistence and canonical semantics
• Query Engine: cold object-store execution

Source of Truth

• services/gateway/src/proxy/handler/policy.rs
• services/coordinator/internal/server/server_find.go
• services/controller/internal/grpc/lifecycle_service.go
• services/storage-engine/src/tiered/mod.rs
• services/query-engine/src/grpc/service.rs

Verification

Use both topologies before production:

make e2e-single
make e2e-local-cluster