feat(hotpath): fill runtime-core db/io gaps

[ScriptedAlchemy]

One-crate gap-fill PR (HP-db-core): adds #[hotpath::measure] coverage to the tracedecay-runtime-core DB/IO kernel only — src/db/connection/facade.rs, src/db/connection/query_write.rs, and src/store/memory/crud/*. 59 new measure sites, attribute-only insertions, no behavior changes, no Cargo.toml changes.

Guarantees held:

• hotpath stays opt-in (never in default/production); every macro is a no-op without --features hotpath.
• No FunctionsCpu/samply enabled.
• No existing #[hotpath::measure] sites restamped; hooks and host-integration untouched; no other crates touched.
• No measures added to git_repository_authority test/bench files (owned by bc-30275fe8).
• Trait-impl delegators left unmeasured to avoid double-counting; only inherent methods carry spans.

Verified: cargo check -p tracedecay-runtime-core and cargo check -p tracedecay-runtime-core --features hotpath both pass.

Files touched / new measure sites / new labels

File	New sites	New labels
src/db/connection/facade.rs	23	runtime_core.db.write_conn.query / .execute / .execute_batch / .long_lease_begin; runtime_core.db.read_conn.query / .snapshot_begin; runtime_core.db.snapshot.query; runtime_core.db.long_lease.batch / .commit / .rollback; runtime_core.db.memory_txn.query / .execute / .execute_batch / .commit / .rollback; runtime_core.db.write_txn.execute / .query / .execute_batch (each shared by the inherent + _engine twin) / .commit / .rollback
src/db/connection/query_write.rs	9	runtime_core.db.query_scalar; runtime_core.db.execute_write; runtime_core.db.execute_write_batch; runtime_core.db.authority_batch; runtime_core.db.writer.lane_wait; runtime_core.db.writer.open; runtime_core.db.snapshot.begin; runtime_core.db.write_txn.begin / .begin_bulk
src/store/memory/crud/commit.rs	8	runtime_core.memory.commit_fact; .last_event; .append_order_check; .replay_check; .collision_check; .anchors_ensure; .anchor_upsert; .assertion_insert
src/store/memory/crud/lineage.rs	6	runtime_core.memory.purged_projection_check; .event_refs_ensure; .event_insert; .projection_publish; .receipt_outcome; .fact_identity_ensure
src/store/memory/crud/commands.rs	5	runtime_core.memory.feedback_projection; .commit_receipt; .replay_add; .replay_update; .replay_remove
src/store/memory/crud/project.rs	3	runtime_core.memory.project_list; .project_find_digest; .active_fact_count
src/store/memory/crud/feedback.rs	3	runtime_core.memory.feedback_history; .replay_feedback; .fact_inspect
src/store/memory/crud/add.rs	2	runtime_core.memory.add_candidates; .add_classify

Skipped by design: #[cfg(test)] fixture methods, trait-impl delegators, trivial getters/constructors, and the drop-only ReadSnapshot::commit/rollback.

  

[changeset-bot]

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Latest commit: 859be98

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[github-actions]

Performance Comparison codex/tracedecay-total-redesign-plan-reopened → cursor/hotpath-gap-fill-be1f

Total Elapsed Time: 4.67s → 5.25s (+12.4%)
CPU Baseline: 69.79µs → 69.64µs (-0.2%)
Benchmark ID: index-bench-timing

timing - Execution duration of functions.

+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| Function                                 | Calls                      | Avg                             | P95                              | Total                            | % Total                      |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| tracedecay-index-bench                   | 1 → 1 (+0.0%)              | 4.67s → 5.25s (+12.4%)          | 4.67s → 5.26s (+12.6%)           | 4.67s → 5.25s (+12.4%)           | 100.00% → 100.00% (+0.0%)    |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.append_pages              | 13 → 13 (+0.0%)            | 181.44ms → 206.76ms (+14.0%)    | 290.98ms → 333.45ms (+14.6%)     | 2.36s → 2.69s (+14.0%)           | 50.48% → 51.17% (+1.4%)      |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.sqlite              | 13 → 13 (+0.0%)            | 137.97ms → 162.59ms (+17.8%)    | 232.13ms → 268.04ms (+15.5%)     | 1.79s → 2.11s (+17.9%)           | 38.39% → 40.24% (+4.8%)      |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.postings            | 13 → 13 (+0.0%)            | 81.74ms → 81.34ms (-0.5%)       | 110.95ms → 111.48ms (+0.5%)      | 1.06s → 1.06s (+0.0%)            | 22.74% → 20.13% (-11.5%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.commit              | 13 → 13 (+0.0%)            | 53.27ms → 78.29ms (+47.0%) ⚠️   | 117.57ms → 182.58ms (+55.3%) ⚠️  | 692.56ms → 1.02s (+47.3%) ⚠️     | 14.82% → 19.37% (+30.7%) ⚠️  |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| code_index.workers.install               | 83 → 83 (+0.0%)            | 12.15ms → 11.79ms (-3.0%)       | 39.55ms → 40.30ms (+1.9%)        | 1.01s → 978.37ms (-3.1%)         | 21.58% → 18.62% (-13.7%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.finalization.advance_wake | 14 → 14 (+0.0%)            | 50.00ms → 69.16ms (+38.3%) ⚠️   | 231.74ms → 278.13ms (+20.0%) ⚠️  | 699.94ms → 968.24ms (+38.3%) ⚠️  | 14.98% → 18.43% (+23.0%) ⚠️  |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| CodeIndexProductionOwnerV1::extract_file | 276 → 276 (+0.0%)          | 3.96ms → 3.50ms (-11.6%)        | 7.82ms → 5.31ms (-32.1%) 🚀      | 1.09s → 964.84ms (-11.5%)        | 23.39% → 18.37% (-21.5%) 🚀  |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| code_index.build.and_publish             | 2 → 2 (+0.0%)              | 416.49ms → 395.43ms (-5.1%)     | 433.85ms → 398.72ms (-8.1%)      | 832.98ms → 790.85ms (-5.1%)      | 17.83% → 15.05% (-15.6%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| domain.canonical.sha256                  | 114526 → 114526 (+0.0%)    | 6.83µs → 6.55µs (-4.1%)         | 10.82µs → 10.80µs (-0.2%)        | 782.41ms → 750.61ms (-4.1%)      | 16.75% → 14.29% (-14.7%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.prepare_pages             | 13 → 13 (+0.0%)            | 36.22ms → 36.84ms (+1.7%)       | 52.20ms → 55.71ms (+6.7%)        | 470.81ms → 478.95ms (+1.7%)      | 10.08% → 9.12% (-9.5%)       |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| 🆕 query.artifact.finalization.commit    | 0 → 14 (+100.0%) ⚠️        | 0.00ns → 31.58ms (+100.0%) ⚠️   | 0.00ns → 210.24ms (+100.0%) ⚠️   | 0.00ns → 442.16ms (+100.0%) ⚠️   | 0.00% → 8.42% (+100.0%) ⚠️   |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| code_index.chunk.index_file              | 276 → 276 (+0.0%)          | 1.79ms → 1.60ms (-10.6%)        | 4.25ms → 2.33ms (-45.2%) 🚀      | 493.36ms → 441.92ms (-10.4%)     | 10.56% → 8.41% (-20.4%) 🚀   |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| code_index.extract.parser_artifact       | 276 → 276 (+0.0%)          | 1.69ms → 1.49ms (-11.8%)        | 4.00ms → 2.26ms (-43.5%) 🚀      | 465.66ms → 411.42ms (-11.6%)     | 9.97% → 7.83% (-21.5%) 🚀    |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.parallel_prepare    | 13 → 13 (+0.0%)            | 28.08ms → 28.60ms (+1.9%)       | 40.60ms → 42.86ms (+5.6%)        | 365.03ms → 371.75ms (+1.8%)      | 7.81% → 7.08% (-9.3%)        |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| 🗑️ code_index.chunk.build                | 276 → 0 (-100.0%) 🚀       | 1.10ms → 0.00ns (-100.0%) 🚀    | 2.21ms → 0.00ns (-100.0%) 🚀     | 302.34ms → 0.00ns (-100.0%) 🚀   | 6.47% → 0.00% (-100.0%) 🚀   |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+

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