fix: qualify corporate-action ledger reads (#36)

.proofline/lines/line-0007/evidence/activity-log.md

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+# Activity Log
+
+- 2026-09-13T21:26:26+09:00 — 사용자가 `REQ-0007`, 신규 `AC-0037`, 기존 `AC-0032`·`AC-0034`·`AC-0036` satisfy 집합을 승인했다. `REQ-0007`은 `approved`, `AC-0037`은 `active`로 전환했고 `proofline validate`가 기존 line status warning만 남기고 통과했다.
+- 2026-09-13T21:26:26+09:00 — 직접 구현 branch `fix/issue-19-corporate-action-reads`를 생성했다. 계획: 실제 PostgreSQL 실패 회귀 추가 → joined query base column qualification → focused repository/API 회귀 → 전체 회귀·정적 검사 → 독립 QC → commit/PR.
+- 2026-09-13T21:40:00+09:00 — `test_joined_ledger_reads_qualify_base_columns` 실제 PostgreSQL 회귀를 추가하고 joined PnL/unified-ledger SQL의 ledger projection·predicate·cursor/order reference를 `ledger.`로 최소 한정했다. API holdings/ledger/PNL focused suite는 50 passed; Ruff는 기존 SIM117 4건만 보고했다.
+- 2026-09-13T21:44:31+09:00 — 로컬 TimescaleDB를 기동해 실제 PostgreSQL에서 unqualified JOIN이 SQLSTATE `42702` (`AmbiguousColumn`)를 내는 RED와 qualified JOIN 성공을 확인했다. Mixed BUY+`stock_consolidation` repository 회귀는 source filter·keyset cursor를 포함해 통과했고, 두 API corporate-action 회귀까지 합쳐 `3 passed`였다.

.proofline/lines/line-0007/evidence/test-report.md

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+# AC-0037 Test Report
+
+- 실행 시각: 2026-09-13T21:53:39+09:00
+- 기준 Git HEAD: `c7d8235bdebfa8c2459b0b3300d8ed40a9f465e5`
+- 검증 대상: 위 HEAD의 `fix/issue-19-corporate-action-reads` working-tree diff
+- 실제 backend: `timescale/timescaledb-ha:pg17` (`docker-compose.local-test.yml`, PostgreSQL DSN은 기록하지 않음)
+- 결과: PASS
+
+## AC mapping
+
+- Joined projection·metadata mapping·기존 BUY 동작: `tests/test_corporate_action_atomic_recovery_postgres.py::test_joined_ledger_reads_qualify_base_columns`
+- Unified ledger source filter·latest-first·keyset cursor: 같은 실제 PostgreSQL test의 `source="corporate_action"` 및 `before_recorded_at`/`before_ledger_entry_id` assertions
+- Holdings HTTP 200 및 기존 WAC/total cost basis: `tests/test_v1_portfolios_holdings.py::test_corporate_action_row_keeps_holdings_cost_basis_http_200`
+- Unified ledger HTTP 200 및 corporate-action response schema: `tests/test_v1_portfolios_manual_ledger.py::test_unified_ledger_includes_corporate_action_fields`
+- Positional mapping drift guard: `tests/test_issue34_regressions.py::test_runtime_schema_has_one_corporate_action_ddl_and_replay_mapping_starts_at_18`
+- Authorization·기존 API schema·기업행동 없는 경로: 전체 repository suite
+
+## Executed evidence
+
+1. Unqualified query probe on real PostgreSQL: SQLSTATE `42702`, `AmbiguousColumn` (RED).
+2. Same JOIN with `ledger.ledger_entry_id`: success (GREEN).
+3. Real PostgreSQL repository regression plus two API regressions: `3 passed, 1 warning`.
+4. Full suite with real-PostgreSQL selector enabled: `711 passed, 25 skipped, 17 warnings`.
+5. Python compile, `proofline validate`, and `git diff --check`: PASS. ProofLine emitted only pre-existing line-0001–0006 status warnings.
+6. Ruff: no finding was introduced by the changed lines; repository has four pre-existing `SIM117` findings in `app/repositories/postgres.py` and pre-existing `UP017` findings in `tests/test_v1_portfolios_holdings.py`.
+
+## Artifact identities
+
+- `app/repositories/postgres.py`: `2fa5ecbdc29a41bbc1379069b15e7cf43c7bf62cf8f00a3fa824ff8c182f410e`
+- `tests/test_corporate_action_atomic_recovery_postgres.py`: `0d0c436efe443b53c11b792885ca17e983320afe70d13122c7b89d3d73cf0cdd`
+- `tests/test_v1_portfolios_holdings.py`: `daff8ce2bec9f161e1a399d9bb3bea3cbf97707c6d8805cfedb66900b7b036e2`
+- `tests/test_v1_portfolios_manual_ledger.py`: `45bb77f66708b0b76e133031b3f35ac06714558c9603ec56c1b642906ca2e681`
+- `tests/test_issue34_regressions.py`: `661742e430522af58ebc15a8f97c8385e1f65126bf71a2783716c269a76ac45f`
+- `.proofline/lines/line-0007/req-0007.md`: `a3a6ae501f7635cc80a5a96416e61aa3ecce326a732126feba3b9ad1a7c8df73`
+- `.proofline/criteria/ac-0037.md`: `99dab6c2d70367c236dc08a65b24d6ddf94e131500e06cd52e9ab89784708d2d`