Allow ferrite beads without impedance_ohm to load.

Missing Z is optional, not invented. graph_build skips bad models
instead of aborting. Other inductors still require value_henries.

periscope/src/backend/periscopex/graph.py

@@ -7,6 +7,7 @@ in ``periscope/dependency/`` until this module is the live winner.
 from __future__ import annotations
 
 import json
+import logging
 import re
 from pathlib import Path
 
@@ -27,6 +28,8 @@ from backend.periscopex.parsers import parse_bom, parse_netlist_any
 from backend.periscopex.resolve_passives import SkippedItem, resolve_bom, resolved_to_specs
 from backend.periscopex.utils import safe_mpn
 
+logger = logging.getLogger(__name__)
+
 # Ref-des prefix → type. Longer prefixes must be checked first (LED before L).
 _REF_PREFIXES: tuple[tuple[str, ComponentType], ...] = (
     ("LED", ComponentType.DISCRETE),
@@ -160,8 +163,12 @@ def _load_component_models(directory: str | Path) -> dict[str, ComponentSpecs]:
     if not dirpath.is_dir():
         return result
     for json_file in dirpath.glob("*.json"):
-        raw = json.loads(json_file.read_text())
+        try:
-        model = ComponentModel.model_validate(raw)
+            raw = json.loads(json_file.read_text())
+            model = ComponentModel.model_validate(raw)
+        except Exception:
+            logger.exception("skipping bad component model %s", json_file)
+            continue
         result[model.mpn] = model.specs
     return result
 

periscope/src/backend/periscopex/models.py

@@ -163,8 +163,8 @@ class InductorSpecs(BaseModel):
     @model_validator(mode="after")
     def _require_primary_value(self) -> InductorSpecs:
         if self.component_subtype == "passive.ferrite_bead":
-            if self.impedance_ohm is None:
+            # Z at test frequency is optional. Missing Z is INSUFFICIENT
-                raise ValueError("ferrite bead requires impedance_ohm")
+            # evidence later — never invent impedance_ohm, never crash ingest.
             return self
         if self.value_henries is None:
             raise ValueError("inductor requires value_henries")

periscope/src/backend/periscopex/resolve_passives.py

@@ -175,16 +175,19 @@ def simple_to_typed_passive_specs(simple: SimpleComponentSpecs) -> ComponentSpec
         )
     if subtype == "passive.ferrite_bead":
         raw = vals.get("impedance_ohm") or vals.get("value_ohms")
-        if raw is None:
+        z = None
-            raise ValueError("Missing impedance_ohm in auto-resolved ferrite bead specs")
+        if raw is not None:
-        z = _parse_spice_value(str(raw)) if isinstance(raw, str) else float(raw)
+            z = _parse_spice_value(str(raw)) if isinstance(raw, str) else float(raw)
         dcr_raw = vals.get("dcr_ohms")
         dcr = None
         if dcr_raw is not None:
             dcr = _parse_spice_value(str(dcr_raw)) if isinstance(dcr_raw, str) else float(dcr_raw)
+        formatted = value_formatted
+        if not formatted and z is not None:
+            formatted = _format_value(z, "ohm")
         return InductorSpecs(
             component_subtype=st, value_henries=None,
-            value_formatted=value_formatted or _format_value(z, "ohm"),
+            value_formatted=formatted or "FB",
             tolerance=tolerance, package=package,
             current_rating_a=str(vals.get("current_rating_a")) if vals.get("current_rating_a") else None,
             dcr_ohms=dcr, impedance_ohm=z,

periscope/src/frontend/content/changelog.md

@@ -2,6 +2,13 @@
 
 What's new in Periscope.
 
+## 2.60.1 — 2026-09-20 — Ferrite bead without Z still loads
+
+Ferrite beads that only have current/DCR validate. Missing `impedance_ohm` is not invented and does not crash `graph_build`. Other inductors still need `value_henries`.
+
+- [Fixed] `InductorSpecs` no longer requires Z on `passive.ferrite_bead`.
+- [Changed] Bad `models/*.json` are skipped with a log, not a pipeline abort.
+
 ## 2.60.0 — 2026-09-20 — Incomplete PCB exam and owner project delete
 
 Unfinished placing/routing still uses MODE=pcb. Parser and checks run on partial layouts; missing copper is INSUFFICIENT or skip, never invented millimetres. Via≠Pad unchanged. Dashboard owners can delete a project after a confirm dialog.

tests/test_inductor_specs.py

@@ -0,0 +1,107 @@
+"""Ferrite beads without Z validate; other inductors still need henries."""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import pytest
+from pydantic import ValidationError
+
+from backend.periscopex.graph import _load_component_models
+from backend.periscopex.models import ComponentModel, InductorSpecs
+from backend.periscopex.resolve_passives import simple_to_typed_passive_specs
+from backend.periscopex.models import SimpleComponentSpecs
+
+
+def test_ferrite_bead_without_impedance_ohm_validates():
+    specs = InductorSpecs(
+        component_subtype="passive.ferrite_bead",
+        value_formatted="120 ohm @ 100 MHz",
+        current_rating_a="3A",
+        dcr_ohms=0.03,
+    )
+    assert specs.impedance_ohm is None
+    model = ComponentModel(mpn="BLM21PG121SN1D", specs=specs)
+    assert model.specs.impedance_ohm is None
+
+
+def test_ferrite_bead_live_payload_without_z_validates():
+    model = ComponentModel.model_validate({
+        "mpn": "BLM21PG121SN1D",
+        "specs": {
+            "specs_type": "inductor",
+            "component_subtype": "passive.ferrite_bead",
+            "value_henries": 120.0,
+            "value_formatted": "120 ohm @ 100 MHz",
+            "tolerance": None,
+            "package": "0805",
+            "current_rating_a": "3A",
+            "dcr_ohms": 0.03,
+        },
+    })
+    assert model.specs.impedance_ohm is None
+    assert model.specs.current_rating_a == "3A"
+    assert model.specs.dcr_ohms == 0.03
+
+
+def test_ferrite_bead_with_impedance_ohm_still_ok():
+    specs = InductorSpecs(
+        component_subtype="passive.ferrite_bead",
+        value_formatted="120 ohm @ 100 MHz",
+        impedance_ohm=120.0,
+        current_rating_a="3A",
+        dcr_ohms=0.03,
+    )
+    assert specs.impedance_ohm == 120.0
+
+
+def test_inductor_still_requires_value_henries():
+    with pytest.raises(ValidationError, match="inductor requires value_henries"):
+        InductorSpecs(
+            component_subtype="passive.inductor",
+            value_formatted="15nH",
+        )
+
+
+def test_load_models_bead_without_z_does_not_raise(tmp_path: Path):
+    payload = {
+        "mpn": "BLM21PG121SN1D",
+        "specs": {
+            "specs_type": "inductor",
+            "component_subtype": "passive.ferrite_bead",
+            "value_formatted": "FB",
+            "current_rating_a": "3A",
+            "dcr_ohms": 0.03,
+        },
+    }
+    (tmp_path / "BLM21PG121SN1D.json").write_text(json.dumps(payload) + "\n")
+    loaded = _load_component_models(tmp_path)
+    assert "BLM21PG121SN1D" in loaded
+    assert loaded["BLM21PG121SN1D"].impedance_ohm is None
+
+
+def test_load_models_skips_inductor_missing_henries(tmp_path: Path):
+    bad = {
+        "mpn": "LQW-BAD",
+        "specs": {
+            "specs_type": "inductor",
+            "component_subtype": "passive.inductor",
+            "value_formatted": "x",
+        },
+    }
+    (tmp_path / "LQW-BAD.json").write_text(json.dumps(bad) + "\n")
+    loaded = _load_component_models(tmp_path)
+    assert loaded == {}
+
+
+def test_simple_to_typed_bead_without_z():
+    simple = SimpleComponentSpecs(
+        specs_type="passive",
+        component_subtype="passive.ferrite_bead",
+        values={"current_rating_a": "3A", "dcr_ohms": 0.03},
+    )
+    specs = simple_to_typed_passive_specs(simple)
+    assert specs.specs_type == "inductor"
+    assert specs.impedance_ohm is None
+    assert specs.dcr_ohms == 0.03