Added custom extra fields to backend

No integration tests yet, TBD

spoolman/database/filament.py

@@ -41,6 +41,7 @@ async def create(
     settings_extruder_temp: Optional[int] = None,
     settings_bed_temp: Optional[int] = None,
     color_hex: Optional[str] = None,
+    extra: Optional[dict[str, str]] = None,
 ) -> models.Filament:
     """Add a new filament to the database."""
     vendor_item: Optional[models.Vendor] = None
@@ -62,6 +63,7 @@ async def create(
         settings_extruder_temp=settings_extruder_temp,
         settings_bed_temp=settings_bed_temp,
         color_hex=color_hex,
+        extra=[models.FilamentField(key=k, value=v) for k, v in (extra or {}).items()],
     )
     db.add(filament)
     await db.commit()
@@ -131,7 +133,7 @@ async def find(
                 stmt = stmt.order_by(field.desc())
 
     rows = await db.execute(stmt)
-    result = list(rows.scalars().all())
+    result = list(rows.unique().scalars().all())
     if total_count is None:
         total_count = len(result)
 
@@ -152,6 +154,8 @@ async def update(
                 filament.vendor = None
             else:
                 filament.vendor = await vendor.get_by_id(db, v)
+        elif k == "extra":
+            filament.extra = [models.FilamentField(key=k, value=v) for k, v in v.items()]
         else:
             setattr(filament, k, v)
     await db.commit()