feat(hotpath): fill sessions ingest/transcript/backfill gaps

[ScriptedAlchemy]

Summary

Gap-fill hotpath coverage in crates/tracedecay-sessions only (HP-sessions scope). 42 new #[hotpath::measure] sites across 10 files, all on persist / ingest / recall / backfill / IO paths. Purely additive: no existing measure sites, gauges, or program logic were touched (diff is 58 inserted attribute lines, 0 deletions). No Cargo.toml changes — the crate's hotpath / hotpath-alloc / hotpath-cpu passthroughs already exist and none of them are reachable from default or production. Macros no-op without --features hotpath.

Rebased onto the current base tip. During the rebase, the base had independently instrumented the four hermes sweep entry points (sessions.hosts.hermes.ingest_projects / ingest_project / ingest_user / ingest_legacy); those base labels were kept and this PR's duplicate attributes for the same functions were dropped. This PR still adds the two hermes discovery-walk measures below.

Verified after rebase: cargo check -p tracedecay-sessions --features hotpath and cargo check -p tracedecay-sessions both pass; no duplicate labels crate-wide; npm run lint:commit passes. Base is codex/tracedecay-total-redesign-plan-reopened (#707, not merged by this PR).

New measure sites

File	Function	New label
runtime/store_access/transcript.rs	get_parse_offset (free fn)	sessions.transcript.offset_read
runtime/store_access/transcript.rs	set_parse_offset (free fn)	sessions.transcript.offset_write
runtime/store_access/transcript.rs	upsert_session	sessions.transcript.session_upsert
runtime/store_access/transcript.rs	get_session_result	sessions.transcript.session_read
runtime/store_access/transcript.rs	upsert_session_message_in_existing_tx	sessions.transcript.message_upsert
runtime/store_access/transcript.rs	persist_transcript_offset_result	sessions.transcript.offset_commit
runtime/store_access/transcript.rs	upsert_transcript_batches_inner	sessions.transcript.batch_persist
runtime/store_access/transcript.rs	advance_parse_offset_result	sessions.transcript.offset_advance
runtime/store_access/transcript.rs	replace_parse_offset_result	sessions.transcript.offset_replace
runtime/store_access/transcript.rs	replace_parse_offset_pair_result	sessions.transcript.offset_replace_pair
runtime/hosts/hermes/ingest.rs	all_profile_sources	sessions.hosts.hermes.discover_profiles
runtime/hosts/hermes/ingest.rs	candidate_state_dbs	sessions.hosts.hermes.discover_candidates
runtime/workflow/workflow_index.rs	ensure_workflow_index_schema	sessions.workflow_index.ensure_schema
runtime/workflow/workflow_index.rs	read_ingest_watermark	sessions.workflow_index.watermark_read
runtime/workflow/workflow_index.rs	upsert_run	sessions.workflow_index.run_upsert
runtime/workflow/workflow_index.rs	upsert_agent	sessions.workflow_index.agent_upsert
runtime/workflow/workflow_index.rs	runs_for_session	sessions.workflow_index.runs_for_session
runtime/workflow/workflow_index.rs	run_for_id	sessions.workflow_index.run_read
runtime/workflow/workflow_index.rs	agents_for_run	sessions.workflow_index.agents_for_run
runtime/workflow/workflow_index.rs	runs_for_git_scope	sessions.workflow_index.runs_for_git_scope
runtime/git_correlation/backfill/history_progress.rs	install_final_schema	sessions.git_correlation.history_schema
runtime/git_correlation/backfill/history_progress.rs	read_progress	sessions.git_correlation.history_progress_read
runtime/git_correlation/backfill/history_progress.rs	read_oldest_progress	sessions.git_correlation.history_progress_oldest
runtime/git_correlation/backfill/history_progress.rs	insert_progress	sessions.git_correlation.history_progress_insert
runtime/git_correlation/backfill/history_progress.rs	compare_and_swap_progress	sessions.git_correlation.history_progress_cas
runtime/git_correlation/backfill/history_progress.rs	upsert_segment	sessions.git_correlation.history_segment_upsert
runtime/git_correlation/backfill/history_progress.rs	read_pending_page	sessions.git_correlation.history_pending_page
runtime/git_correlation/backfill/bounded.rs	run_bounded_history_index_page	sessions.git_correlation.backfill.bounded_page
runtime/git_correlation/backfill/bounded.rs	stream_git_evidence	sessions.git_correlation.backfill.stream_evidence
runtime/git_correlation/backfill/bounded.rs	resume_git_evidence	sessions.git_correlation.backfill.resume_evidence
runtime/git_correlation/backfill/bounded.rs	dry_run_native_history	sessions.git_correlation.backfill.dry_run
runtime/git_correlation/backfill/bounded.rs	persist_frontier	sessions.git_correlation.backfill.frontier_persist
runtime/hosts/cursor_composer/ingest.rs	drain_composer_projection_queue	sessions.hosts.cursor.composer_projection_drain
runtime/hosts/cursor_composer/ingest.rs	advance_composer_coverage	sessions.hosts.cursor.composer_coverage_advance
runtime/hosts/cursor_composer/ingest.rs	ingest_with_context	sessions.hosts.cursor.composer_sweep
runtime/hosts/cursor_composer/ingest.rs	ingest_state_vscdb	sessions.hosts.cursor.composer_state_vscdb
runtime/hosts/cursor_composer/ingest.rs	ingest_chat_store_dbs	sessions.hosts.cursor.composer_chat_stores
runtime/hosts/cursor_composer/ingest.rs	ingest_one_store_db	sessions.hosts.cursor.composer_store_db
runtime/ingest/scheduler.rs	read_ingest_frontier	sessions.ingest.frontier_read
runtime/ingest/scheduler.rs	write_ingest_frontier	sessions.ingest.frontier_write
runtime/ingest/scheduler.rs	read_codex_discovery_frontier	sessions.ingest.codex_frontier_read
runtime/ingest/scheduler.rs	write_codex_discovery_frontier	sessions.ingest.codex_frontier_write
runtime/hosts/cursor.rs (add-missing)	try_ingest_cursor_user_transcript_event_capped_with_admission	sessions.hosts.cursor.ingest_user_event_capped
runtime/hosts/cursor.rs (add-missing)	admit_cursor_sweep_observations_with_session_ids	sessions.hosts.cursor.sweep_admit
runtime/hosts/cursor.rs (add-missing)	CursorSweepSource::transcript_paths	sessions.hosts.cursor.sweep_discover
runtime/hosts/cursor.rs (add-missing)	dispatch_model_for_agent	sessions.hosts.cursor.dispatch_model_scan
runtime/source.rs (add-missing)	load_transcript_cursor	sessions.source.cursor_load
runtime/source.rs (add-missing)	read_host_provider_coverage	sessions.source.coverage_read
runtime/source.rs (add-missing)	persist_host_provider_coverage	sessions.source.coverage_persist
runtime/source.rs (add-missing)	preflight_strict_jsonl	sessions.source.preflight_jsonl
runtime/source.rs (add-missing)	read_changed_file	sessions.source.read_changed
runtime/source.rs (add-missing)	read_changed_with_companion	sessions.source.read_changed_companion
runtime/observation/jsonl_observation_admission.rs (add-missing)	build_shared_jsonl_page	sessions.observation.jsonl_page_build
runtime/observation/jsonl_observation_admission.rs (add-missing)	prepare_shared_jsonl_window_with_background_cpu	sessions.observation.jsonl_window_prepare
runtime/observation/jsonl_observation_admission.rs (add-missing)	shared_jsonl_page_with_cancellation	sessions.observation.jsonl_page_lookup
runtime/observation/jsonl_observation_admission.rs (add-missing)	advance_coverage	sessions.observation.jsonl_coverage_advance
runtime/observation/jsonl_observation_admission.rs (add-missing)	capture	sessions.observation.jsonl_capture
runtime/observation/jsonl_observation_admission.rs (add-missing)	capture_window	sessions.observation.jsonl_capture_window

Conventions followed

• Labels use the crate's established prefixes (sessions.transcript.*, sessions.hosts.hermes.*, sessions.hosts.cursor.*, sessions.git_correlation.*, sessions.workflow_index.*, sessions.ingest.*, sessions.source.*, sessions.observation.*); no duplicate labels crate-wide.
• Async fns use future = true; sync FS-walk/scan fns use plain #[hotpath::measure].
• Skipped getters, Display impls, row decoders, thin wrappers, #[cfg(test)] code, and planning-only pure functions.

  

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Performance Comparison codex/tracedecay-total-redesign-plan-reopened → cursor/hotpath-gap-fill-f2b0

Total Elapsed Time: 5.11s → 5.23s (+2.4%)
CPU Baseline: 87.72µs → 92.66µs (+5.6%)
Benchmark ID: index-bench-timing

timing - Execution duration of functions.

+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| Function                                 | Calls                      | Avg                             | P95                             | Total                            | % Total                      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| tracedecay-index-bench                   | 1 → 1 (+0.0%)              | 5.11s → 5.23s (+2.3%)           | 5.11s → 5.23s (+2.3%)           | 5.11s → 5.23s (+2.3%)            | 100.00% → 100.00% (+0.0%)    |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.append_pages              | 13 → 13 (+0.0%)            | 189.35ms → 193.58ms (+2.2%)     | 263.06ms → 266.86ms (+1.4%)     | 2.46s → 2.52s (+2.4%)            | 48.19% → 48.12% (-0.1%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.sqlite              | 13 → 13 (+0.0%)            | 131.70ms → 140.20ms (+6.5%)     | 181.01ms → 194.90ms (+7.7%)     | 1.71s → 1.82s (+6.4%)            | 33.52% → 34.85% (+4.0%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| CodeIndexProductionOwnerV1::extract_file | 276 → 276 (+0.0%)          | 4.41ms → 4.30ms (-2.5%)         | 6.73ms → 6.57ms (-2.4%)         | 1.22s → 1.19s (-2.5%)            | 23.84% → 22.69% (-4.8%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.workers.install               | 83 → 83 (+0.0%)            | 15.09ms → 14.30ms (-5.2%)       | 51.68ms → 50.33ms (-2.6%)       | 1.25s → 1.19s (-4.8%)            | 24.53% → 22.69% (-7.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.postings            | 13 → 13 (+0.0%)            | 87.93ms → 87.50ms (-0.5%)       | 124.32ms → 120.00ms (-3.5%)     | 1.14s → 1.14s (+0.0%)            | 22.38% → 21.75% (-2.8%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.build.and_publish             | 2 → 2 (+0.0%)              | 474.01ms → 470.90ms (-0.7%)     | 478.41ms → 472.38ms (-1.3%)     | 948.02ms → 941.81ms (-0.7%)      | 18.56% → 18.01% (-3.0%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| domain.canonical.sha256                  | 114526 → 114526 (+0.0%)    | 8.20µs → 8.11µs (-1.1%)         | 13.46µs → 13.50µs (+0.3%)       | 938.59ms → 928.34ms (-1.1%)      | 18.37% → 17.75% (-3.4%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.finalization.advance_wake | 14 → 14 (+0.0%)            | 55.73ms → 59.51ms (+6.8%)       | 244.58ms → 250.74ms (+2.5%)     | 780.18ms → 833.12ms (+6.8%)      | 15.27% → 15.93% (+4.3%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.commit              | 13 → 13 (+0.0%)            | 40.40ms → 49.34ms (+22.1%) ⚠️   | 55.18ms → 70.91ms (+28.5%) ⚠️   | 525.16ms → 641.40ms (+22.1%) ⚠️  | 10.28% → 12.27% (+19.4%)     |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.prepare_pages             | 13 → 13 (+0.0%)            | 49.67ms → 45.40ms (-8.6%)       | 71.17ms → 67.08ms (-5.7%)       | 645.65ms → 590.23ms (-8.6%)      | 12.64% → 11.29% (-10.7%)     |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.chunk.index_file              | 276 → 276 (+0.0%)          | 2.10ms → 2.02ms (-3.8%)         | 3.10ms → 2.93ms (-5.5%)         | 580.09ms → 557.10ms (-4.0%)      | 11.36% → 10.65% (-6.2%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.extract.parser_artifact       | 276 → 276 (+0.0%)          | 1.88ms → 1.86ms (-1.1%)         | 2.85ms → 2.82ms (-1.1%)         | 517.76ms → 512.35ms (-1.0%)      | 10.14% → 9.80% (-3.4%)       |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.parallel_prepare    | 13 → 13 (+0.0%)            | 40.20ms → 35.98ms (-10.5%)      | 58.92ms → 53.44ms (-9.3%)       | 522.55ms → 467.79ms (-10.5%)     | 10.23% → 8.95% (-12.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| 🆕 code_index.build.assemble             | 0 → 2 (+100.0%) ⚠️         | 0.00ns → 172.72ms (+100.0%) ⚠️  | 0.00ns → 183.89ms (+100.0%) ⚠️  | 0.00ns → 345.45ms (+100.0%) ⚠️   | 0.00% → 6.61% (+100.0%) ⚠️   |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| 🗑️ code_index.chunk.build                | 276 → 0 (-100.0%) 🚀       | 1.29ms → 0.00ns (-100.0%) 🚀    | 1.86ms → 0.00ns (-100.0%) 🚀    | 356.98ms → 0.00ns (-100.0%) 🚀   | 6.99% → 0.00% (-100.0%) 🚀   |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+

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