Match official climbs against their recorded sample

An official climb matched on endpoint coordinates alone. On a loop ridden
the other way the route meets the climb's top before its bottom, so pairing
each start with the first end inside its lap window credited a 5.9 km
passage as the 850 m Chemin de la Tour Pey Blanc, and a 49 km one on
another ride.

Climbs now keep the sample of the segment they were created from: the
recorded length and elevation gain of the selected route points, captured
by the ride detail and preview handlers and stored NOT NULL. Matching takes
the whole route and drops any candidate outside ±50% of that sample on
either axis, and attempts are refreshed by upsert and prune so re-analyzing
a ride keeps the recorded-at stamp of the passages that survive.

The backfill leaves the web package: backfill.Run recomputes ride values
then official climb attempts as a single `go run . backfill` command
(climbs-backfill is gone), rideanalysis owns the attempt snapshot, and the
mountain-pass loading margin is shared. Applied to the stored rides it
stamps 78 samples, drops the four bogus attempts and leaves ride 800 with
its three Pont Rout passages.

1 files changed, 13 insertions, 4 deletions

diff --git a/README.md b/README.md
index 3491395..69206ad 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ mise run build
 mise run dev-watch # Start the web server on http://localhost:8080
 go run . fetch-osm # Download the France OSM PBF (resumable)
 go run . extract-osm france-latest.osm.pbf # Extract mountain passes from a France OSM PBF
-go run . backfill # Recompute and persist all ride computed values
+go run . backfill # Recompute ride values and official climb attempts for every stored ride
 go run . backtest # Benchmark computed vs stored ride values
 go run . -- -pprof # Expose pprof endpoints at `/debug/pprof`
 docker compose up -d pyroscope # Start the local Pyroscope server on http://localhost:4040
@@ -65,13 +65,14 @@ An OSM way is an ordered list of nodes; its `highway` tag describes the road typ
 - `geo` — coordinate distance, nearest-point, and shared `Interval` primitives; dependency-free
 - `climb` — climb detection and scoring. A `Route` is the geometry-only trace (distances, elevations, coords), and `Detect` returns `[]DetectedClimb` (a climb plus its ride-relative start index). Provides slope and Cotacol difficulty scoring. Deliberately decoupled from `ride`
 - `ride` — GPX parsing and the ride value (embeds `climb.Route` for geometry, adding timestamps and telemetry), moving-time metrics, and SQLite persistence for imported ride metadata and versioned computed values
-- `official_climb` — matches official climbs against a route by endpoint coordinates
+- `official_climb` — matches official climbs against a route by endpoint coordinates and the recorded sample of the segment the climb was created from: a candidate passage outside ±50% of that sample's length or elevation gain is not the climb
 - `mountain_pass` — OSM PBF extraction (`mountain_pass=yes` / `natural=mountain_pass` nodes), pass storage and querying, and crossings/climb matching on `climb.Climb`
-- `rideanalysis` — orchestrates a ride into analyzed climbs and mountain-pass crossings
+- `rideanalysis` — orchestrates a ride into analyzed climbs and mountain-pass crossings, and snapshots its official-climb attempts
 - `strava` — OAuth2 client returning activity metadata and GPX data
 - `config` — typed YAML configuration and atomic persistence
 - `web` — HTTP server, OAuth callback, sync orchestration, and templ pages
-- `cli` — command handlers for data import, backfill, and benchmarking
+- `backfill` — recomputes the data derived from stored rides: ride values first, then official climb attempts. The migration tool behind `go run . backfill`
+- `cli` — command entry points: `main.go` dispatches, and command bodies live with the packages they drive (`ride` import/benchmarks, `backfill`, `mountain_pass` OSM)
 - test builders `internal/routetest`, `internal/ridetest`, `internal/dbtest`
 
 ```mermaid
@@ -80,6 +81,7 @@ flowchart TB
 
     main["main (bootstrap: main.go)"]
     cli["cli (import, backfill, benchmark)"]
+    backfill["backfill (ride values, climb attempts)"]
     web["web (HTTP + templ, sync)"]
     rideanalysis["rideanalysis (climbs + crossings)"]
     ride["ride (GPX parsing, Ride value, metrics, persistence)"]
@@ -96,6 +98,13 @@ flowchart TB
     cli --> ride
     cli --> mpass
     cli --> config
+    cli --> backfill
+
+    backfill --> ride
+    backfill --> rideanalysis
+    backfill --> official_climb
+    backfill --> mpass
+    backfill --> config
 
     web --> rideanalysis
     web --> strava