trails/openspec/changes/atomic-gpx-save/tasks.md

1. New gpx-save module

• 1.1 Create apps/journal/app/lib/gpx-save.server.ts with GpxValidationError class and validateGpx(gpx: string): Promise<ParsedGpx> — parses, checks ≥2 track points, checks coordinate ranges, throws on failure, returns parsed result
• 1.2 Move setGeomFromGpx logic into gpx-save.server.ts as an internal writeGeom(tx, id, table, coords) function that accepts a Drizzle transaction client and throws on failure (no try/catch)
• 1.3 Write unit tests in gpx-save.server.test.ts covering: valid GPX passes, <2 track points throws, out-of-range coordinates throw, unparseable GPX throws

2. Migrate routes.server.ts

• 2.1 Import validateGpx and writeGeom from gpx-save.server.ts; remove local setGeomFromGpx implementation and its export
• 2.2 Wrap createRoute in db.transaction(): validate GPX → insert row → writeGeom → insert routeVersions, all within the transaction client
• 2.3 Wrap updateRoute in db.transaction(): validate GPX → update row → writeGeom → insert new routeVersions, all within the transaction client
• 2.4 Verify computeRouteStats is called with the ParsedGpx returned by validateGpx (avoid re-parsing)

3. Migrate activities.server.ts

• 3.1 Replace inline parseGpxAsync call in createActivity with validateGpx; extract stats from the returned ParsedGpx
• 3.2 Wrap createActivity in db.transaction(): validate GPX → insert row → writeGeom, all within the transaction client
• 3.3 Wrap createRouteFromActivity in db.transaction(): insert route row → writeGeom → update activity's routeId, all within the transaction client
• 3.4 Remove import { setGeomFromGpx } from "./routes.server.ts" — no longer needed

4. Migrate demo-bot.server.ts

• 4.1 Replace the raw db.insert(routes).values(...) + setGeomFromGpx(routeId, ...) block with a createRoute(ownerId, input) call; pass pre-computed stats via RouteInput fields so createRoute doesn't re-parse BRouter's output
• 4.2 Replace the raw db.insert(activities).values(...) + setGeomFromGpx(activityId, ...) block with a createActivity(ownerId, input) call
• 4.3 Remove import { setGeomFromGpx } from "./routes.server.ts" from demo-bot.server.ts

5. Callback endpoint error handling

• 5.1 In api.routes.$id.callback.ts, catch GpxValidationError from updateRoute and return a 400 response with the validation message (currently the catch block returns 401 for all errors — narrow it)

6. ADR

• 6.1 Write docs/adr/0006-atomic-gpx-save.md documenting that PostGIS geometry writes are always transactional with row writes and that gpx-save.server.ts is the sole owner of geometry persistence

7. Verification

• 7.1 Run pnpm typecheck — no new type errors
• 7.2 Run pnpm test — all existing tests pass; new gpx-save.server.test.ts tests pass
• 7.3 Confirm setGeomFromGpx is no longer exported from any file (grep -r "setGeomFromGpx" apps/journal/app returns no results outside gpx-save.server.ts)