feat: add split-safe fundamentals research protocol

app/services/fundamentals_research.py

@@ -30,6 +30,18 @@ QUALITY_FACTORS = (
     "share_count_change_yoy",
 )
 GROWTH_FACTORS = ("revenue_growth_yoy", "eps_growth_yoy")
+SPLIT_SAFE_FACTOR_POLARITY: dict[str, bool] = {
+    "revenue_growth_yoy": True,
+    "operating_margin": True,
+    "fcf_margin": True,
+    "net_debt_to_ebitda": False,
+}
+SPLIT_SAFE_QUALITY_FACTORS = (
+    "operating_margin",
+    "fcf_margin",
+    "net_debt_to_ebitda",
+)
+SPLIT_SAFE_GROWTH_FACTORS = ("revenue_growth_yoy",)
 COMPOSITE_KEYS = ("quality", "growth", "balanced")
 
 
@@ -46,22 +58,29 @@ def cross_section_scores(
     features_by_issuer: Mapping[str, Mapping[str, Any]],
     *,
     min_cross_section: int = MIN_CROSS_SECTION,
+    split_safe: bool = False,
 ) -> dict[str, dict[str, float | None]]:
     """Return favorable factor ranks and composites for every issuer.
 
-    Quality needs two of four inputs; growth needs one of two. Balanced requires
-    both sub-scores and weights them equally, so quality's four inputs do not
-    mechanically dominate growth's two inputs.
+    The default reproduces the original registered experiment. ``split_safe``
+    excludes diluted-EPS growth and share-count change because filing-time
+    values are not comparable across stock splits without point-in-time split
+    factors. Its quality score needs two of three remaining inputs and its
+    growth score is revenue growth. Balanced always weights the two sub-scores
+    equally.
     """
+    factor_polarity = SPLIT_SAFE_FACTOR_POLARITY if split_safe else FACTOR_POLARITY
+    quality_factors = SPLIT_SAFE_QUALITY_FACTORS if split_safe else QUALITY_FACTORS
+    growth_factors = SPLIT_SAFE_GROWTH_FACTORS if split_safe else GROWTH_FACTORS
     result = {
         str(issuer): {
-            **{key: None for key in FACTOR_POLARITY},
+            **{key: None for key in factor_polarity},
             **{key: None for key in COMPOSITE_KEYS},
         }
         for issuer in features_by_issuer
     }
 
-    for factor, higher_is_better in FACTOR_POLARITY.items():
+    for factor, higher_is_better in factor_polarity.items():
         values = {
             str(issuer): _finite_or_none(features.get(factor))
             for issuer, features in features_by_issuer.items()
@@ -75,8 +94,8 @@ def cross_section_scores(
             result[issuer][factor] = rank
 
     for scores in result.values():
-        quality_values = _available(scores, QUALITY_FACTORS)
-        growth_values = _available(scores, GROWTH_FACTORS)
+        quality_values = _available(scores, quality_factors)
+        growth_values = _available(scores, growth_factors)
         if len(quality_values) >= 2:
             scores["quality"] = _mean(quality_values)
         if growth_values:

docs/research/fundamentals-weight-backtest.md

@@ -1,6 +1,7 @@
 # Point-in-time fundamentals weight backtest
 
-Status: pre-registered local research. Running it does not change production.
+Status: initial experiment completed; split-safe follow-up registered locally.
+Running either protocol does not change production.
 
 ## Question
 
@@ -10,7 +11,7 @@ position sizing, capacity, costs, ATR trail, and post-stop re-entry policy remai
 unchanged. This isolates the incremental value of fundamentals as a ranking
 overlay.
 
-## Registered experiment
+## Completed initial experiment
 
 The control is the production 80/20 residual-momentum / volatility rank. The
 runner tests three fundamental composites at weights 10%, 20%, 30%, and 40%:
@@ -28,11 +29,38 @@ tracked universe. Missing composite scores are neutral at 50. The formula is:
 There are 13 registered portfolio trials including the control. That complete
 count is used by the Deflated Sharpe calculation.
 
-Historical P/E and FCF yield are excluded. Stored Alpaca bars are split-adjusted,
-while filing-time EPS and shares are not guaranteed to use today's split basis;
-mixing them without point-in-time split factors can manufacture valuation moves.
-Earnings surprise is also excluded because the completed Dolt SUE study already
-failed its promotion bar for this strategy.
+No overlay passed the registered train and validation requirements. Review also
+found that filing-time diluted EPS and shares are not guaranteed to use the same
+split basis across periods. That makes EPS growth and share-count change unsafe
+for historical ranking without point-in-time split factors. The initial result
+remains an auditable rejection of its registered arms, but it is not evidence
+that split-safe fundamentals have no value.
+
+## Registered split-safe follow-up
+
+Run with `--protocol split-safe`. This is a smaller sensitivity experiment:
+
+- Quality: operating margin, FCF margin, and low net-debt/EBITDA. At least two
+  inputs must exist.
+- Growth: revenue growth only.
+- Balanced: equal weight to the quality and growth sub-scores. Both must exist.
+- Overlay weights: 5%, 10%, and 15%.
+
+Diluted-EPS growth and share-count change are excluded completely: they are not
+ranked, do not enter composites, and do not appear in factor-IC output. Historical
+P/E and FCF yield remain excluded for the same split-basis reason. Earnings
+surprise remains excluded because the completed Dolt SUE study failed its
+promotion bar for this strategy.
+
+There are 10 registered portfolio trials including the control. The split-safe
+report uses 10 in its Deflated Sharpe calculation. It has a separate score cache
+and `fundamentals-splitsafe-*` output prefix, so it cannot be confused with or
+silently reuse the initial experiment's scores.
+
+The test window has already been inspected during the initial experiment. Keep
+the original date boundaries and development selection discipline, but treat the
+follow-up as sensitivity evidence. Any promotion still requires forward paper
+evidence.
 
 ## Point-in-time rule
 
@@ -93,6 +121,8 @@ different path to the launcher.
 
 ## 3. Run it
 
+The launcher now defaults to the registered `split-safe` follow-up:
+
 ```bash
 ./scripts/run_fundamentals_macbook.sh \
   backtest_snapshots/fundamentals-backtest.sqlite
@@ -106,16 +136,24 @@ WORKERS=8 ./scripts/run_fundamentals_macbook.sh \
   backtest_snapshots/fundamentals-backtest.sqlite
 ```
 
+To reproduce the completed initial matrix instead, opt in explicitly:
+
+```bash
+PROTOCOL=original ./scripts/run_fundamentals_macbook.sh \
+  backtest_snapshots/fundamentals-backtest.sqlite
+```
+
 The first run builds two caches under `reports/.cache`: production candidate
-replay and point-in-time fundamental scores. If interrupted, rerun the same
-command; valid caches are reused. Cache keys include snapshot size and mtime, so
-a new snapshot triggers a rebuild.
+replay and protocol-specific point-in-time fundamental scores. If interrupted,
+rerun the same command; valid caches are reused. Cache keys include the protocol,
+snapshot size, and mtime, so neither a protocol switch nor a new snapshot can
+reuse incompatible scores.
 
 ## 4. Bring the result back
 
 The final line names one ZIP such as:
 
-`reports/fundamentals-overlay-20260723-180000.zip`
+`reports/fundamentals-splitsafe-20260723-180000.zip`
 
 That ZIP contains:
 

scripts/run_fundamentals_macbook.sh

@@ -5,6 +5,7 @@ ROOT="$(git rev-parse --show-toplevel)"
 cd "$ROOT"
 
 SNAPSHOT="${1:-backtest_snapshots/fundamentals-backtest.sqlite}"
+PROTOCOL="${PROTOCOL:-split-safe}"
 WORKERS="${WORKERS:-$(sysctl -n hw.logicalcpu 2>/dev/null || echo 8)}"
 if [[ "$WORKERS" -gt 1 ]]; then
   WORKERS=$((WORKERS - 1))
@@ -21,17 +22,34 @@ if [[ ! -f "$SNAPSHOT" ]]; then
   exit 1
 fi
 
+case "$PROTOCOL" in
+  split-safe)
+    PREFIX="fundamentals-splitsafe"
+    SCORE_CACHE="reports/.cache/fundamentals-splitsafe-scores.pkl"
+    ;;
+  original)
+    PREFIX="fundamentals-overlay"
+    SCORE_CACHE="reports/.cache/fundamentals-scores.pkl"
+    ;;
+  *)
+    echo "Unsupported PROTOCOL: $PROTOCOL (use split-safe or original)" >&2
+    exit 1
+    ;;
+esac
+
 STAMP="$(date -u +%Y%m%d-%H%M%S)"
-OUT="reports/fundamentals-overlay-${STAMP}.json"
+OUT="reports/${PREFIX}-${STAMP}.json"
 
 echo "Snapshot: $SNAPSHOT"
 echo "Workers:  $WORKERS"
+echo "Protocol: $PROTOCOL"
 echo "Output:   $OUT"
 
 "$PYTHON" scripts/run_fundamentals_research.py "$SNAPSHOT" \
+  --protocol "$PROTOCOL" \
   --workers "$WORKERS" \
   --candidate-cache reports/.cache/fundamentals-candidates.pkl \
-  --fundamentals-cache reports/.cache/fundamentals-scores.pkl \
+  --fundamentals-cache "$SCORE_CACHE" \
   --out "$OUT"
 
 echo

scripts/run_fundamentals_research.py

@@ -2,8 +2,9 @@
 
 The production qualification gate is unchanged. The runner first measures
 30-session factor IC, then reorders already-qualified candidates with quality,
-growth, or balanced fundamental ranks at 10, 20, 30, and 40 percent weights.
-It writes JSON, Markdown, CSV, and a portable ZIP bundle.
+growth, or balanced fundamental ranks. It supports the original registered
+matrix and a split-safe follow-up sensitivity. It writes JSON, Markdown, CSV,
+and a portable ZIP bundle.
 """
 
 from __future__ import annotations
@@ -37,8 +38,15 @@ if str(ROOT) not in sys.path:
 CACHE_VERSION = "fundamentals-overlay-v1"
 NY = ZoneInfo("America/New_York")
 COMPOSITES = ("quality", "growth", "balanced")
+ORIGINAL_PROTOCOL = "original"
+SPLIT_SAFE_PROTOCOL = "split-safe"
 WEIGHTS = (0.10, 0.20, 0.30, 0.40)
-ARMS: tuple[dict[str, Any], ...] = (
+SPLIT_SAFE_WEIGHTS = (0.05, 0.10, 0.15)
+
+
+def _arm_matrix(weights: tuple[float, ...]) -> tuple[dict[str, Any], ...]:
+    """Build the control plus three bounded overlay families."""
+    return (
         {
             "id": "control_w00",
             "label": "Production 80/20 momentum-volatility rank",
@@ -53,10 +61,15 @@ ARMS: tuple[dict[str, Any], ...] = (
                 "weight": weight,
             }
             for composite in COMPOSITES
-        for weight in WEIGHTS
+            for weight in weights
         ),
     )
+
+
+ARMS = _arm_matrix(WEIGHTS)
 N_TRIALS = len(ARMS)
+SPLIT_SAFE_ARMS = _arm_matrix(SPLIT_SAFE_WEIGHTS)
+SPLIT_SAFE_N_TRIALS = len(SPLIT_SAFE_ARMS)
 
 
 def _parse_args() -> argparse.Namespace:
@@ -74,6 +87,11 @@ def _parse_args() -> argparse.Namespace:
     )
     parser.add_argument("--train-end", default="2024-01-01")
     parser.add_argument("--test-start", default="2025-01-01")
+    parser.add_argument(
+        "--protocol",
+        choices=(ORIGINAL_PROTOCOL, SPLIT_SAFE_PROTOCOL),
+        default=ORIGINAL_PROTOCOL,
+    )
     parser.add_argument("--allow-spawn", action="store_true")
     parser.add_argument("--quiet", action="store_true")
     return parser.parse_args()
@@ -83,9 +101,14 @@ def _sqlite_url(path: Path) -> str:
     return f"sqlite+aiosqlite:///{path.resolve().as_posix()}"
 
 
-def _default_out() -> Path:
+def _default_out(protocol: str = ORIGINAL_PROTOCOL) -> Path:
     stamp = datetime.now().strftime("%Y%m%d-%H%M%S")
-    return Path("reports") / f"fundamentals-overlay-{stamp}.json"
+    label = (
+        "fundamentals-splitsafe"
+        if protocol == SPLIT_SAFE_PROTOCOL
+        else "fundamentals-overlay"
+    )
+    return Path("reports") / f"{label}-{stamp}.json"
 
 
 def _snapshot_hash(path: Path) -> str:
@@ -394,11 +417,15 @@ def _build_scores(
     dates: set[date],
     representatives: dict[str, str],
     snapshots_by_cik: dict[str, list[Any]],
+    split_safe: bool,
     args: argparse.Namespace,
 ) -> tuple[dict[str, dict[str, dict[str, float | None]]], dict[str, Any]]:
     from app.services import fundamentals_derivation as derivation
     from app.services import fundamentals_research as research
 
+    factor_polarity = (
+        research.SPLIT_SAFE_FACTOR_POLARITY if split_safe else research.FACTOR_POLARITY
+    )
     ordered_dates = sorted(dates)
     date_fingerprint = hashlib.sha256(
         "|".join(value.isoformat() for value in ordered_dates).encode()
@@ -408,6 +435,7 @@ def _build_scores(
         snapshot,
         {
             "kind": "point-in-time-scores",
+            "score_profile": SPLIT_SAFE_PROTOCOL if split_safe else ORIGINAL_PROTOCOL,
             "date_fingerprint": date_fingerprint,
             "availability": "accepted before signal-date midnight America/New_York",
         },
@@ -446,12 +474,15 @@ def _build_scores(
                 current_features[cik] = research.raw_features(
                     derivation.derive(visible[cik])
                 )
-        scores = research.cross_section_scores(current_features)
+        scores = research.cross_section_scores(
+            current_features,
+            split_safe=split_safe,
+        )
         scores_by_date[signal_date.isoformat()] = scores
         coverage_rows.append(
             {
                 key: sum(row.get(key) is not None for row in scores.values())
-                for key in (*research.FACTOR_POLARITY, *research.COMPOSITE_KEYS)
+                for key in (*factor_polarity, *research.COMPOSITE_KEYS)
             }
         )
         if not args.quiet and date_index % 100 == 0:
@@ -469,13 +500,13 @@ def _factor_diagnostics(
     representatives: dict[str, str],
     prices: dict[str, tuple],
     scores_by_date: dict[str, dict[str, dict[str, float | None]]],
+    factor_keys: tuple[str, ...],
     train_end: date,
     test_start: date,
 ) -> dict[str, list[dict]]:
     from app.services import backtest_service as bt
-    from app.services import fundamentals_research as research
 
-    signal_keys = (*research.FACTOR_POLARITY, *research.COMPOSITE_KEYS)
+    signal_keys = (*factor_keys, *COMPOSITES)
     observations: list[dict[str, Any]] = []
     for cik, symbol in representatives.items():
         columns = prices[symbol]
@@ -533,6 +564,7 @@ def _attach_overlay_ranks(
     candidates: list[dict],
     ticker_rows: list[dict],
     scores_by_date: dict[str, dict[str, dict[str, float | None]]],
+    arms: tuple[dict[str, Any], ...],
 ) -> dict[str, Any]:
     from app.services import backtest_service as bt
     from app.services import fundamentals_research as research
@@ -550,7 +582,7 @@ def _attach_overlay_ranks(
             if value is not None:
                 covered[composite] += 1
         base = candidate.get(bt.RESIDUAL_HIGH_VOL_BLEND_80_20_KEY)
-        for arm in ARMS:
+        for arm in arms:
             if arm["composite"] is None:
                 continue
             candidate[_ranking_key(arm)] = research.overlay_rank(
@@ -626,6 +658,7 @@ def _run_arm(
     data: dict[str, Any],
     train_end: date,
     test_start: date,
+    n_trials: int,
 ) -> tuple[dict[str, Any], dict[str, set[str]]]:
     from app.services import backtest_service as bt
     from scripts import run_research_matrix as shared
@@ -691,7 +724,7 @@ def _run_arm(
         dsr = bt.deflated_sharpe_ratio(
             sim.get("sharpe"),
             sim.get("sharpe_se"),
-            N_TRIALS,
+            n_trials,
             n_returns=sim.get("n_returns"),
             return_skew=sim.get("return_skew"),
             return_kurtosis=sim.get("return_kurtosis"),
@@ -781,13 +814,20 @@ def _fmt(value: Any) -> str:
 
 
 def _markdown(report: dict[str, Any]) -> str:
+    protocol_id = report.get("research_protocol", ORIGINAL_PROTOCOL)
+    title = (
+        "Split-safe fundamentals overlay sensitivity"
+        if protocol_id == SPLIT_SAFE_PROTOCOL
+        else "Point-in-time fundamentals overlay research"
+    )
     lines = [
-        "# Point-in-time fundamentals overlay research",
+        f"# {title}",
         "",
         "Generated: {}".format(report.get("generated_at")),
         "",
         "## Protocol",
         "",
+        "- Research protocol: **{}**.".format(protocol_id),
         "- Train ends before **{}**.".format(report["splits"]["train_end"]),
         "- Validation runs until **{}**.".format(report["splits"]["test_start"]),
         "- Test starts at that date and is not used to select the arm.",
@@ -976,9 +1016,21 @@ def _write_outputs(report: dict[str, Any], out: Path, *, bundle: bool) -> None:
 
 
 async def _main() -> None:
+    from app.services import fundamentals_research as research
+
     args = _parse_args()
+    split_safe = args.protocol == SPLIT_SAFE_PROTOCOL
+    arms = SPLIT_SAFE_ARMS if split_safe else ARMS
+    n_trials = len(arms)
+    factor_keys = tuple(
+        (
+            research.SPLIT_SAFE_FACTOR_POLARITY
+            if split_safe
+            else research.FACTOR_POLARITY
+        ).keys()
+    )
     snapshot = Path(args.snapshot)
-    out = Path(args.out) if args.out else _default_out()
+    out = Path(args.out) if args.out else _default_out(args.protocol)
     if not snapshot.exists():
         raise SystemExit(f"snapshot not found: {snapshot}")
     if args.workers < 1:
@@ -1010,21 +1062,45 @@ async def _main() -> None:
         all_dates,
         representatives,
         data["snapshots_by_cik"],
+        split_safe,
         args,
     )
     candidate_coverage = _attach_overlay_ranks(
-        candidates, data["ticker_rows"], scores_by_date
+        candidates, data["ticker_rows"], scores_by_date, arms
     )
     factor_ic = _factor_diagnostics(
         representatives,
         data["prices"],
         scores_by_date,
+        factor_keys,
         train_end,
         test_start,
     )
 
+    warnings = [
+        "Current tracked universe only: historical constituent membership and "
+        "delisted names are unavailable, so absolute results have survivorship bias.",
+        "Earnings surprise is excluded because the completed SUE study already "
+        "failed its promotion bar for this strategy.",
+        "The test window has already been observed; this follow-up is sensitivity "
+        "evidence and live paper performance remains the final out-of-sample check.",
+    ]
+    if split_safe:
+        warnings.insert(
+            1,
+            "Diluted-EPS growth and share-count change are excluded because filing-time "
+            "values are not split-comparable without point-in-time split factors.",
+        )
+    else:
+        warnings.insert(
+            1,
+            "Historical valuation is excluded because split-adjusted bars cannot be "
+            "safely combined with filing-time EPS and shares without split factors.",
+        )
+
     report: dict[str, Any] = {
         "generated_at": datetime.now(timezone.utc).isoformat(),
+        "research_protocol": args.protocol,
         "git_commit": _git_commit(),
         "snapshot": str(snapshot.resolve()),
         "snapshot_sha256": _snapshot_hash(snapshot),
@@ -1039,9 +1115,10 @@ async def _main() -> None:
                 "test": f"entry date >= {test_start.isoformat()}",
             },
         },
-        "n_trials": N_TRIALS,
-        "pre_registered_arms": list(ARMS),
+        "n_trials": n_trials,
+        "pre_registered_arms": list(arms),
         "protocol": {
+            "id": args.protocol,
             "qualification": "unchanged production gate; rank overlay only",
             "cadence": "daily",
             "fill_mode": "close; production near-close proxy",
@@ -1051,22 +1128,17 @@ async def _main() -> None:
                 "conservative match for the daily pre-market SEC import"
             ),
             "missing_fundamental_score": 50.0,
+            "factor_keys": list(factor_keys),
+            "split_sensitive_metrics_excluded": (
+                ["eps_growth_yoy", "share_count_change_yoy"] if split_safe else []
+            ),
             "selection": (
                 "highest validation Sharpe among arms with train and validation "
                 "Sharpe not below control and validation drawdown within 2pp"
             ),
             "production_mutation": False,
         },
-        "warnings": [
-            "Current tracked universe only: historical constituent membership and "
-            "delisted names are unavailable, so absolute results have survivorship bias.",
-            "Historical valuation is excluded because split-adjusted bars cannot be "
-            "safely combined with filing-time EPS and shares without split factors.",
-            "Earnings surprise is excluded because the completed SUE study already "
-            "failed its promotion bar for this strategy.",
-            "The test window remains research evidence, not a pristine future sample; "
-            "live paper performance is still the final out-of-sample check.",
-        ],
+        "warnings": warnings,
         "data_audit": audit,
         "strategy_config": {
             "recommendation": data["config"],
@@ -1087,10 +1159,12 @@ async def _main() -> None:
 
     trade_sets: dict[str, dict[str, set[str]]] = {}
     control: dict[str, Any] | None = None
-    for arm in ARMS:
+    for arm in arms:
         if not args.quiet:
             print("running {}".format(arm["id"]), flush=True)
-        result, arm_trades = _run_arm(arm, candidates, data, train_end, test_start)
+        result, arm_trades = _run_arm(
+            arm, candidates, data, train_end, test_start, n_trials
+        )
         trade_sets[str(arm["id"])] = arm_trades
         if control is None:
             control = result

tests/unit/test_fundamentals_research.py

@@ -51,6 +51,45 @@ def test_composites_use_equal_subgroup_weighting():
     assert scores["3"]["balanced"] == 50.0
 
 
+def test_split_safe_composites_ignore_eps_and_share_count():
+    def features(unsafe_multiplier: int):
+        return {
+            str(index): {
+                "operating_margin": index,
+                "fcf_margin": index,
+                "net_debt_to_ebitda": 6 - index,
+                "revenue_growth_yoy": index,
+                "eps_growth_yoy": unsafe_multiplier * (6 - index),
+                "share_count_change_yoy": unsafe_multiplier * index,
+            }
+            for index in range(1, 6)
+        }
+
+    baseline = research.cross_section_scores(features(1), split_safe=True)
+    distorted = research.cross_section_scores(features(1_000_000), split_safe=True)
+
+    assert distorted == baseline
+    assert baseline["5"]["quality"] == 100.0
+    assert baseline["5"]["growth"] == 100.0
+    assert baseline["5"]["balanced"] == 100.0
+    assert "eps_growth_yoy" not in baseline["5"]
+    assert "share_count_change_yoy" not in baseline["5"]
+
+
+def test_split_safe_quality_still_requires_two_comparable_inputs():
+    features = {
+        str(index): {
+            "operating_margin": index,
+            "revenue_growth_yoy": index,
+        }
+        for index in range(1, 6)
+    }
+    scores = research.cross_section_scores(features, split_safe=True)
+    assert all(row["quality"] is None for row in scores.values())
+    assert scores["5"]["growth"] == 100.0
+    assert scores["5"]["balanced"] is None
+
+
 def test_overlay_uses_neutral_missing_score_and_validates_weight():
     assert research.overlay_rank(90, None, 0.2) == 82.0
     assert research.overlay_rank(90, 100, 0.2) == 92.0

tests/unit/test_fundamentals_research_runner.py

@@ -29,6 +29,27 @@ def test_arm_matrix_is_bounded_and_pre_registered():
     }
 
 
+def test_split_safe_matrix_is_smaller_and_trial_corrected():
+    assert runner.SPLIT_SAFE_N_TRIALS == 10
+    assert runner.SPLIT_SAFE_ARMS[0]["id"] == "control_w00"
+    assert {arm["weight"] for arm in runner.SPLIT_SAFE_ARMS[1:]} == {
+        0.05,
+        0.10,
+        0.15,
+    }
+    assert {arm["composite"] for arm in runner.SPLIT_SAFE_ARMS[1:]} == {
+        "quality",
+        "growth",
+        "balanced",
+    }
+
+
+def test_split_safe_output_has_a_distinct_name():
+    assert runner._default_out(runner.SPLIT_SAFE_PROTOCOL).name.startswith(
+        "fundamentals-splitsafe-"
+    )
+
+
 def test_development_grade_does_not_read_test_window():
     control = {
         "windows": [