baseline(#137): pre-migration OTel span capture from da3901c

Raw Jaeger trace dumps (with and without incoming traceparent) plus a
derived span inventory and README describing the pre-migration span shape.
Captured from master da3901c release build against a local Jaeger; see
docs/tracing-baseline/pre-migration/README.md for the procedure and the
single span-neutral deviation (aux listen port 8088->18088).

Artifact branch only; /docs/* is gitignored, files force-added deliberately.

docs/tracing-baseline/pre-migration/README.md

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+# Pre-migration span baseline (ticket #137, map #135)
+
+Captured from **master @ `da3901c`** ("before" the tracing migration) so the
+post-migration output can be diffed for parity. See map #135 for the
+migration's destination.
+
+## What was run
+
+- **Revision:** `da3901c` (merge of "Prefs: owner defaults"), the last
+  master commit before `feature/tracing-migration`.
+- **Build:** `cargo build --release` — release is required; the pre-migration
+  OTel init is behind `#[cfg(not(debug_assertions))]`, so debug builds are a
+  no-op (no global tracer provider, no spans).
+- **Exporter:** local Jaeger all-in-one (`jaegertracing/all-in-one:latest`),
+  OTLP/gRPC on host `:14317` (container `:4317`), UI `:16686`. Prod SigNoz
+  (`OTLP_OTLS_ENDPOINT=http://192.168.10.50:4317`) was overridden deliberately.
+- **DB:** a private `.backup` copy of the live `auth.db` (21,298 `image_exif`
+  rows, 4 NAS-backed libraries). The live deployment (`image-rs.service`) was
+  left running and untouched; all output dirs (thumbs/gifs/video/reels) point
+  at a temp dir.
+- **LLM backend:** the live local stack — `LLM_BACKEND=llamacpp`,
+  `LLAMA_SWAP_URL=http://192.168.10.50:9292/v1`, model
+  `qwen3.8-27b-abliterated`.
+
+### Deviation from pristine `da3901c`
+
+The binary was built from `da3901c` with **one span-neutral change**: the
+hardcoded secondary listener `.bind("localhost:8088")` was moved to
+`.bind("localhost:18088")` because the live `image-rs.service` owns `:8088`.
+The listen port cannot affect span production. Everything else is unmodified.
+
+### Requests exercised (the representative set)
+
+All with `Authorization: Bearer <JWT>` (minted with the live `SECRET_KEY`,
+`sub=2`).
+
+| # | Request | Span trace(s) |
+|---|---------|---------------|
+| 1 | `GET /photos?path=Colleen&recursive=true&limit=20` | `cb07eeec…` (3 spans) |
+| 2 | `GET /memories?path=.&recursive=true` | `44b3b67d…` (6 spans) |
+| 3 | `POST /insights/generate/agentic` `{file_path:"Photo06172345.jpg",backend:"local"}` → **202 job_id=380** (async) | `948d2756…` (HTTP span) **and** `9b520713…` (background, 22 spans) |
+| 4 | `POST /insights/chat/stream` `{file_path:"Photo06172345.jpg",user_message:"What was I wearing in this photo?",backend:"local"}` (SSE, 88 text deltas, `done`) | fragmented — see below |
+| 5 | `GET /photos?path=Colleen&recursive=true&limit=5` **with** `traceparent: 00-1111…1111-2222…2222-01` | `11111111…` (3 spans) |
+
+## Span shape (the "before")
+
+**Service:** `image-server` (resource `service.name`), version from
+`CARGO_PKG_VERSION`. No per-request HTTP server span exists — the migration's
+`tracing-actix-web` middleware (#139) adds one.
+
+**Span names**
+
+- Operation / "root" spans (created manually in handlers): `list_photos`,
+  `list_memories`, `http.insights.generate_agentic`, `ai.insight.generate_agentic`,
+  `ai.agentic.loop`, `ai.rag.search_daily_summaries`, `generate_video_thumbnail`.
+- DB spans: `db.{query_type}.{operation}` — `query_type ∈ {query, insert, update}`,
+  `operation` = snake_case DAO method (`get_exif`, `store_insight`, …).
+  Tracer scope (`otel.scope.name`) is `db`.
+- LLM spans: `llm.request`, tracer scope `image-server`.
+
+**`span.kind`:** `internal` for every operation/DB span; `client` for
+`llm.request`.
+
+**Key attributes**
+
+- Every span: `otel.scope.name` (`image-server` or `db`), `otel.status_code`
+  (`OK` / unset), `span.kind`.
+- DB (`db.*`): `db.query_type`, `db.operation`.
+- LLM (`llm.request`): `llm.model` (`qwen3.8-27b-abliterated`),
+  `llm.provider` (`llamacpp`), `llm.operation` (`chat` for tool calls,
+  `chat_stream` for the SSE turn), `llm.tokens.input`, `llm.tokens.output`,
+  `http.status_code`.
+- `list_photos`: rich request shape — `path`, `recursive`, `sort`, `library`,
+  `media_type`, `pagination.limit/offset/enabled`, `file_count`,
+  `returned_count`, `total_count`, `optimization.batch_tags`,
+  `optimization.db_sort`, `tag_filter_mode`, plus empty camera/gps/date fields.
+- `ai.insight.generate_agentic`: `backend`, `file_path`, `images_inline`,
+  `max_iterations`, `model`. `ai.agentic.loop`: `iterations_used`.
+- `generate_video_thumbnail`: `file-name`, `library`, `type`.
+- `ai.rag.search_daily_summaries`: `query`, `date`, `limit`, `results_count`,
+  `time_weighted`.
+
+**Nesting — the headline finding.** Parent/child threading is *inconsistent*:
+
+1. **No HTTP root span.** Handlers open an operation-named span as a root.
+2. **Most DB spans are orphaned into their own single-span trace** (see
+   `span-inventory.json`: `trace_count == span_count` for most ops).
+   `db.query.get_prefs`, `db.query.count_for_library`, `db.insert.store_insight`,
+   `db.update.*`, etc. each form a separate trace.
+3. **Threading works in pockets.** `list_photos` (→ 2 DB children),
+   `list_memories` (→ `get_prefs` + 4× `get_memories_in_window`), and the
+   agentic loop (`ai.insight.generate_agentic` → `ai.agentic.loop` →
+   `llm.request` + DB spans) nest correctly.
+4. **Async work loses the trace.** `POST /insights/generate/agentic` returns
+   **202** with `http.insights.generate_agentic` in one trace; the background
+   generation is a *different root trace* (`ai.insight.generate_agentic`).
+   The streaming chat path is likewise fragmented — its DB calls and
+   `llm.request` land as separate single-span traces, with **no handler span
+   at all**.
+5. **One 222-span trace** (`b94440d1…`) holds the startup thumbnail sweep —
+   all `generate_video_thumbnail` spans share one trace.
+
+**Incoming propagation WORKS.** With a caller-supplied W3C `traceparent`, the
+`list_photos` span is created in the caller's trace-id and references the
+remote span-id as `CHILD_OF` — i.e. the request joins the upstream trace
+correctly. This is the behavior the migration must preserve.
+
+## Files
+
+- `traces-no-traceparent.json` — all 33 traces from requests 1–4 (Jaeger
+  `/api/traces` dump; requests made without an incoming traceparent).
+- `traces-with-traceparent.json` — includes the propagation test (request 5).
+- `span-inventory.json` — per-operation summary: span count, trace count,
+  kind, scope, status, attribute keys. The direct input for a before/after
+  shape diff.
+
+## Re-capturing
+
+1. Build `da3901c` release (or the branch under test for the "after").
+2. `docker run -d --name jaeger -p 16686:16686 -p 14317:4317 jaegertracing/all-in-one:latest`.
+3. Run the server against a **copy** of the DB with
+   `OTLP_OTLS_ENDPOINT=http://localhost:14317` and a temp `BIND_URL`; remember
+   the hardcoded secondary `localhost:8088` bind collides with the live
+   service (patch it, or stop the service).
+4. Mint a JWT (`HS256`, `{sub, exp}`, `SECRET_KEY`) and replay the request set
+   in the table above.
+5. `curl 'http://localhost:16686/api/traces?service=image-server&limit=600'`
+   → regenerate `span-inventory.json` and diff operation names, kinds,
+   attribute keys, and nesting.

docs/tracing-baseline/pre-migration/span-inventory.json

@@ -0,0 +1,590 @@
+[
+  {
+    "operation": "generate_video_thumbnail",
+    "span_count": 222,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "image-server",
+    "status": "(none)",
+    "attribute_keys": [
+      "file-name",
+      "library",
+      "otel.scope.name",
+      "span.kind",
+      "type"
+    ]
+  },
+  {
+    "operation": "llm.request",
+    "span_count": 8,
+    "trace_count": 3,
+    "kind": "client",
+    "scope": "image-server",
+    "status": "OK",
+    "attribute_keys": [
+      "http.status_code",
+      "llm.model",
+      "llm.operation",
+      "llm.provider",
+      "llm.tokens.input",
+      "llm.tokens.output",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.count_for_library",
+    "span_count": 4,
+    "trace_count": 4,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_memories_in_window",
+    "span_count": 4,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_persona",
+    "span_count": 4,
+    "trace_count": 4,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_prefs",
+    "span_count": 4,
+    "trace_count": 4,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.insert.upsert_entity",
+    "span_count": 2,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_event_count",
+    "span_count": 2,
+    "trace_count": 2,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_exif",
+    "span_count": 2,
+    "trace_count": 2,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_location_count",
+    "span_count": 2,
+    "trace_count": 2,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.has_any_faces",
+    "span_count": 2,
+    "trace_count": 2,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.has_any_summaries",
+    "span_count": 2,
+    "trace_count": 2,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.list_entities",
+    "span_count": 2,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "ai.agentic.loop",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "image-server",
+    "status": "OK",
+    "attribute_keys": [
+      "iterations_used",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "ai.insight.generate_agentic",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "image-server",
+    "status": "OK",
+    "attribute_keys": [
+      "backend",
+      "file_path",
+      "images_inline",
+      "max_iterations",
+      "model",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "ai.rag.search_daily_summaries",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "image-server",
+    "status": "OK",
+    "attribute_keys": [
+      "date",
+      "limit",
+      "otel.scope.name",
+      "otel.status_code",
+      "query",
+      "results_count",
+      "span.kind",
+      "time_weighted"
+    ]
+  },
+  {
+    "operation": "db.insert.create_job",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.insert.store_insight",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.insert.upsert_fact",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.insert.upsert_photo_link",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.faces_for_hash",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "content_hash",
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.find_relevant_events_hybrid",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.find_similar_summaries_with_time_weight",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_active_job",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_current_insight_for_library",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_links_for_photo",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_tag_counts_batch",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "file_count",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.get_tags_for_path",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "path",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.list_rel_paths_for_libraries",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.query.resolve_content_hash",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.update.cancel_active_jobs",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.update.complete_job",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.update.update_facts_insight_id",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "db.update.update_training_messages",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "db",
+    "status": "OK",
+    "attribute_keys": [
+      "db.operation",
+      "db.query_type",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "http.insights.generate_agentic",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "image-server",
+    "status": "OK",
+    "attribute_keys": [
+      "backend",
+      "file_path",
+      "job_id",
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "list_memories",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "image-server",
+    "status": "OK",
+    "attribute_keys": [
+      "otel.scope.name",
+      "otel.status_code",
+      "span.kind"
+    ]
+  },
+  {
+    "operation": "list_photos",
+    "span_count": 1,
+    "trace_count": 1,
+    "kind": "internal",
+    "scope": "image-server",
+    "status": "OK",
+    "attribute_keys": [
+      "camera_make",
+      "camera_model",
+      "date_from",
+      "date_to",
+      "exclude_tag_ids",
+      "file_count",
+      "gps_lat",
+      "gps_lon",
+      "gps_radius_km",
+      "lens_model",
+      "library",
+      "media_type",
+      "optimization.batch_tags",
+      "optimization.db_sort",
+      "otel.scope.name",
+      "otel.status_code",
+      "pagination.enabled",
+      "pagination.limit",
+      "pagination.offset",
+      "path",
+      "recursive",
+      "returned_count",
+      "sort",
+      "span.kind",
+      "tag_filter_mode",
+      "tag_ids",
+      "total_count"
+    ]
+  }
+]

docs/tracing-baseline/pre-migration/traces-no-traceparent.json

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docs/tracing-baseline/pre-migration/traces-with-traceparent.json

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