feat(vision): il server esegue tramite worker e salva misure vere

Aggiunge POST /api/vision/execute: route l'immagine al worker di visione,
mappa le uscite del grafo sulle quote e le salva con save_measurement -
stesso verdetto, stesso gate del fuori tolleranza di ogni altra misura.
Nuova tabella vision_results (una riga per acquisizione, non per quota) e
input_method 'camera' su measurements.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014BBnuACZSCJqXrMYC3LUMU

src/backend/models/api/vision.py

@@ -0,0 +1,16 @@
+"""Pydantic schemas for the vision execution response."""
+from pydantic import BaseModel
+
+
+class VisionMeasurementResult(BaseModel):
+    """One quote's outcome, as much of it as the client needs to show."""
+    subtask_id: int
+    value: float
+    pass_fail: str
+
+
+class VisionExecuteResponse(BaseModel):
+    """What `POST /api/vision/execute` returns: the run, and every quote it filled."""
+    vision_result_id: int
+    engine_version: str
+    measurements: list[VisionMeasurementResult]

src/backend/models/orm/__init__.py

@@ -7,6 +7,7 @@ from src.backend.models.orm.access_log import AccessLog
 from src.backend.models.orm.setting import SystemSetting, RecipeVersionAudit
 from src.backend.models.orm.station import Station, StationRecipeAssignment
 from src.backend.models.orm.production import ProductionRun, ProductionEvent
+from src.backend.models.orm.vision import VisionResult
 
 __all__ = [
     "User",
@@ -22,4 +23,5 @@ __all__ = [
     "StationRecipeAssignment",
     "ProductionRun",
     "ProductionEvent",
+    "VisionResult",
 ]

src/backend/models/orm/measurement.py

@@ -38,11 +38,17 @@ class Measurement(Base):
 
     # Input method
     input_method: Mapped[str] = mapped_column(
-        Enum("usb_caliper", "manual", name="input_method_enum"),
+        Enum("usb_caliper", "manual", "camera", name="input_method_enum"),
         nullable=False,
         default="manual",
     )
 
+    # The vision execution that produced this value, when there was one. Null for
+    # everything taken by caliper or typed by hand.
+    vision_result_id: Mapped[Optional[int]] = mapped_column(
+        Integer, ForeignKey("vision_results.id"), nullable=True
+    )
+
     # Time spent by the operator entering this value (client-reported)
     input_duration_ms: Mapped[Optional[int]] = mapped_column(
         Integer, nullable=True

src/backend/models/orm/vision.py

@@ -0,0 +1,40 @@
+"""One row per vision execution - not per quote."""
+from datetime import datetime
+from typing import Optional
+
+from sqlalchemy import DateTime, Enum, ForeignKey, Integer, JSON, String, func
+from sqlalchemy.orm import Mapped, mapped_column
+
+from src.backend.database import Base
+
+
+class VisionResult(Base):
+    __tablename__ = "vision_results"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    task_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("recipe_tasks.id"), nullable=False, index=True
+    )
+    image_path: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    overlay_path: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    engine_version: Mapped[str] = mapped_column(String(64), nullable=False)
+    executed_on: Mapped[str] = mapped_column(
+        Enum("server", "station", name="vision_executed_on_enum"), nullable=False
+    )
+    station_id: Mapped[Optional[int]] = mapped_column(
+        Integer, ForeignKey("stations.id"), nullable=True
+    )
+    device_code: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
+    # Copied, not referenced: a calibration redone six months from now must not
+    # rewrite what a measurement already taken means. Same for the graph.
+    calibration_snapshot: Mapped[Optional[dict]] = mapped_column(JSON, nullable=True)
+    graph_snapshot: Mapped[dict] = mapped_column(JSON, nullable=False)
+    duration_ms: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
+    executed_at: Mapped[datetime] = mapped_column(
+        DateTime, nullable=False, server_default=func.now()
+    )
+
+    __table_args__ = ({"mysql_engine": "InnoDB", "mysql_charset": "utf8mb4"},)
+
+    def __repr__(self) -> str:
+        return f"<VisionResult task={self.task_id} engine={self.engine_version}>"