Add Metrics API: declare/list params and metrics, query bucket values (ticket 004)

Exposes param/metric declarations and derived bucket data over HTTP:
POST /api/params and POST /api/metrics validate and declare against the
engine, persisting into the active profile (if any) so declarations survive
a restart; GET /api/metrics lists declarations; GET /api/metrics/:name
queries bucket values with label, time-range, sequence, and limit filters.
Adds a new EngineQuery::BucketValues variant that layers this filtering on
top of ticket 003's bucket_values helper.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

This commit is contained in:

Hugh Kaznowski

2026-09-05 13:05:00 +01:00

co-authored by

Claude Sonnet 5

parent f0348589f5

commit 49e8590cf3

7 changed files with 554 additions and 10 deletions

									
										Cargo.toml
									
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				@@ -19,3 +19,5 @@ directories = "6.0.0"

				[dev-dependencies]

				tempfile = "3.27.0"

				tower = { version = "0.5", features = ["util"] }

				http-body-util = "0.1"