Ingest canonical observability traces, observations, events, and links
obs_* tables.
Authorization: Bearer <jwt> or project-scoped X-API-Key.Content-Type: application/jsonX-TraceLM-Schema-Version: 2026-02-23 (recommended)X-Idempotency-Key: <uuid-or-stable-key> (recommended, full replay semantics in Phase 2)project_id is required for JWTs with access to multiple projects.X-Idempotency-Key is required for batched requests (traces.length > 1).X-Idempotency-Key is omitted for single-trace payloads, TraceLM uses trace:<trace_id> fallback.