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Configuration matrix (quick reference)

Differential Privacy - clipping_norm: float (0.1–10), default 1.0 - noise_multiplier: float (0.5–3.0), default 1.0 - sample_rate: float (0.001–0.5), default 0.01 - delta: float (<= 1e-3), default 1e-5 - accountant: rdp | gaussian | moments

Federation - strategy: krum | trimmed_mean - rounds: int (1–1000) - participants_per_round: auto | N - retry_backoff: seconds

Security - mTLS: enabled | disabled (prod: enabled) - RBAC roles: admin | operator | viewer - audit: JSONL | SQLite+HMAC

Observability - Prometheus: scrape_interval (default 5s) - Grafana: admin user; password via file secret

Copy‑paste presets 

# Conservative privacy preset
http POST :8000/dp/config X-Role:operator clipping_norm:=0.5 noise_multiplier:=2.0 sample_rate:=0.005 delta:=1e-5 accountant=rdp

# Balanced privacy preset
http POST :8000/dp/config X-Role:operator clipping_norm:=1.0 noise_multiplier:=1.0 sample_rate:=0.01 delta:=1e-5 accountant=rdp

# Robust aggregation preset (Trimmed Mean 10%)
http POST :8000/strategy X-Role:operator strategy=trimmed_mean

# Byzantine tolerance preset (Krum, m=2)
http POST :8000/strategy X-Role:operator strategy=krum

curl equivalents 

curl -fsS -H 'X-Role: operator' -H 'Content-Type: application/json' \
    -d '{"clipping_norm":0.5,"noise_multiplier":2.0,"sample_rate":0.005,"delta":1e-5,"accountant":"rdp"}' http://localhost:8000/dp/config
curl -fsS -H 'X-Role: operator' -H 'Content-Type: application/json' \
    -d '{"clipping_norm":1.0,"noise_multiplier":1.0,"sample_rate":0.01,"delta":1e-5,"accountant":"rdp"}' http://localhost:8000/dp/config
curl -fsS -H 'X-Role: operator' -H 'Content-Type: application/json' \
    -d '{"strategy":"trimmed_mean"}' http://localhost:8000/strategy
curl -fsS -H 'X-Role: operator' -H 'Content-Type: application/json' \
    -d '{"strategy":"krum"}' http://localhost:8000/strategy