Fix weapon sheet

module/models/equipment.mjs

@@ -16,8 +16,7 @@ export default class OathHammerEquipment extends foundry.abstract.TypeDataModel
     // Item slots occupied when carried. 0 = small item (no slots).
     schema.slots = new fields.NumberField({ ...requiredInteger, initial: 0, min: 0 })
 
-    // Rarity: DV for Fortune check when purchasing; 0 = always available
-    schema.rarity = new fields.NumberField({ ...requiredInteger, initial: 0, min: 0, max: 6 })
+    schema.rarity = new fields.StringField({ required: true, initial: "common", choices: SYSTEM.RARITY_CHOICES })
 
     // Light radius in feet — only relevant for light-source items (Candle/Lamp/Lantern/Torch)
     schema.lightRadius = new fields.NumberField({ required: false, nullable: true, initial: null, min: 0 })
@@ -28,5 +27,13 @@ export default class OathHammerEquipment extends foundry.abstract.TypeDataModel
     return schema
   }
 
+  static migrateData(source) {
+    if (typeof source.rarity === "number") {
+      const map = { 0: "common", 1: "uncommon", 2: "rare", 3: "very-rare", 4: "legendary", 5: "legendary", 6: "legendary" }
+      source.rarity = map[source.rarity] ?? "common"
+    }
+    return super.migrateData(source)
+  }
+
   static LOCALIZATION_PREFIXES = ["OATHHAMMER.Equipment"]
 }