feat: add asset ID history API

backend/app/inventory/models.py

@@ -43,6 +43,14 @@ class InventoryMinerDetail(InventoryMinerSummary):
     first_seen_at: datetime | None = None
 
 
+class InventoryAssetIDHistoryEntry(BaseModel):
+    old_asset_id: str | None = None
+    new_asset_id: str
+    changed_at: datetime
+    changed_by: UUID
+    changed_by_display_name: str
+
+
 class InventoryCreateRequest(BaseModel):
     asset_id: str = Field(min_length=1, max_length=120)
     current_mac: str | None = Field(default=None, max_length=64)
@@ -112,3 +120,9 @@ class InventoryMinerDetailResponse(BaseModel):
     data: InventoryMinerDetail
     meta: dict[str, object] = Field(default_factory=dict)
     error: None = None
+
+
+class InventoryAssetIDHistoryResponse(BaseModel):
+    data: list[InventoryAssetIDHistoryEntry]
+    meta: dict[str, object] = Field(default_factory=dict)
+    error: None = None

backend/app/inventory/repository.py

@@ -347,15 +347,19 @@ class InventoryRepository:
                 cur.execute(
                     """
                     SELECT
-                        id,
-                        miner_id,
-                        old_asset_id,
-                        new_asset_id,
-                        changed_at,
-                        changed_by
-                    FROM miner_asset_id_history
-                    WHERE miner_id = %s
-                    ORDER BY changed_at, id
+                        history.id,
+                        history.miner_id,
+                        history.old_asset_id,
+                        history.new_asset_id,
+                        history.changed_at,
+                        history.changed_by,
+                        changed_by_user.display_name
+                            AS changed_by_display_name
+                    FROM miner_asset_id_history AS history
+                    JOIN users AS changed_by_user
+                      ON changed_by_user.id = history.changed_by
+                    WHERE history.miner_id = %s
+                    ORDER BY history.changed_at, history.id
                     """,
                     (miner_id,),
                 )

backend/app/inventory/router.py

@@ -13,6 +13,7 @@ from app.inventory.exceptions import (
     MinerNotFound,
 )
 from app.inventory.models import (
+    InventoryAssetIDHistoryResponse,
     InventoryCreateRequest,
     InventoryListMeta,
     InventoryMetadataUpdateRequest,
@@ -120,6 +121,27 @@ def list_inventory_miners(
     )
 
 
+@router.get(
+    "/{miner_id}/asset-id-history",
+    response_model=InventoryAssetIDHistoryResponse,
+)
+def get_inventory_miner_asset_id_history(
+    miner_id: UUID,
+    service: InventoryServiceDependency,
+    current_user: InventoryReadUser,
+) -> InventoryAssetIDHistoryResponse:
+    del current_user
+    try:
+        history = service.get_asset_id_history(miner_id)
+    except MinerNotFound as exc:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Miner not found",
+        ) from exc
+
+    return InventoryAssetIDHistoryResponse(data=history)
+
+
 @router.get("/{miner_id}", response_model=InventoryMinerDetailResponse)
 def get_inventory_miner(
     miner_id: UUID,

backend/app/inventory/service.py

@@ -12,6 +12,7 @@ from app.inventory.exceptions import (
     MinerNotFound,
 )
 from app.inventory.models import (
+    InventoryAssetIDHistoryEntry,
     InventoryCreateRequest,
     InventoryMetadataUpdateRequest,
     InventoryMinerDetail,
@@ -112,6 +113,17 @@ class InventoryService:
             raise MinerNotFound(miner_id)
         return self._detail_model(row)
 
+    def get_asset_id_history(
+        self,
+        miner_id: UUID,
+    ) -> list[InventoryAssetIDHistoryEntry]:
+        if not self.repository.get_miner_by_id(miner_id):
+            raise MinerNotFound(miner_id)
+        return [
+            InventoryAssetIDHistoryEntry.model_validate(row)
+            for row in self.repository.list_asset_id_history(miner_id)
+        ]
+
     def list_miners(
         self,
         *,

backend/tests/test_inventory_domain.py

@@ -17,7 +17,9 @@ from app.inventory import (
     InventoryService,
     InventoryUpdateRequest,
     InventoryValidationError,
+    MinerNotFound,
 )
+from app.inventory.models import InventoryAssetIDHistoryEntry
 
 
 def inventory_row(**overrides):
@@ -121,6 +123,7 @@ class FakeInventoryRepository:
             "new_asset_id": new_asset_id,
             "changed_at": datetime.now(timezone.utc),
             "changed_by": changed_by,
+            "changed_by_display_name": "Test Actor",
         }
         self.asset_id_history.append(history)
         return history
@@ -207,6 +210,60 @@ class InventoryServiceTests(unittest.TestCase):
         with self.assertRaises(InventoryValidationError):
             self.service.normalize_tags(["valid", "\t\n"])
 
+    def test_asset_id_history_empty_for_known_miner(self):
+        row = inventory_row()
+        self.repository.rows[row["id"]] = row
+
+        self.assertEqual(
+            self.service.get_asset_id_history(row["id"]),
+            [],
+        )
+
+    def test_asset_id_history_maps_populated_repository_results(self):
+        row = inventory_row()
+        self.repository.rows[row["id"]] = row
+        first_changed_at = datetime(2026, 7, 27, tzinfo=timezone.utc)
+        second_changed_at = datetime(2026, 7, 28, tzinfo=timezone.utc)
+        self.repository.asset_id_history = [
+            {
+                "id": uuid4(),
+                "miner_id": row["id"],
+                "old_asset_id": "ASSET-FIRST",
+                "new_asset_id": "ASSET-SECOND",
+                "changed_at": first_changed_at,
+                "changed_by": self.actor_user_id,
+                "changed_by_display_name": "Test Actor",
+            },
+            {
+                "id": uuid4(),
+                "miner_id": row["id"],
+                "old_asset_id": "ASSET-SECOND",
+                "new_asset_id": "ASSET-THIRD",
+                "changed_at": second_changed_at,
+                "changed_by": self.actor_user_id,
+                "changed_by_display_name": "Test Actor",
+            },
+        ]
+
+        history = self.service.get_asset_id_history(row["id"])
+
+        self.assertEqual(len(history), 2)
+        self.assertTrue(
+            all(
+                isinstance(entry, InventoryAssetIDHistoryEntry)
+                for entry in history
+            )
+        )
+        self.assertEqual(
+            [entry.new_asset_id for entry in history],
+            ["ASSET-SECOND", "ASSET-THIRD"],
+        )
+        self.assertEqual(history[0].changed_by_display_name, "Test Actor")
+
+    def test_asset_id_history_unknown_miner_raises_not_found(self):
+        with self.assertRaises(MinerNotFound):
+            self.service.get_asset_id_history(uuid4())
+
     def test_metadata_update_preserves_unspecified_fields(self):
         row = inventory_row(
             asset_tag="ASSET-001",
@@ -472,6 +529,14 @@ class InventoryRepositoryIntegrationTests(unittest.TestCase):
             InventoryMetadataUpdateRequest(asset_id="ASSET-THIRD"),
             actor_user_id=self.actor_user_id,
         )
+        other = service.create_miner(
+            InventoryCreateRequest(asset_id="OTHER-FIRST")
+        )
+        service.update_metadata(
+            other.id,
+            InventoryMetadataUpdateRequest(asset_id="OTHER-SECOND"),
+            actor_user_id=self.actor_user_id,
+        )
 
         self.assertEqual(created.id, second.id)
         self.assertEqual(second.id, third.id)
@@ -491,6 +556,17 @@ class InventoryRepositoryIntegrationTests(unittest.TestCase):
             history[0]["changed_at"],
             history[1]["changed_at"],
         )
+        self.assertTrue(
+            all(
+                row["miner_id"] == created.id
+                and row["changed_by_display_name"]
+                == "Inventory History Test"
+                for row in history
+            )
+        )
+        other_history = self.repository.list_asset_id_history(other.id)
+        self.assertEqual(len(other_history), 1)
+        self.assertEqual(other_history[0]["new_asset_id"], "OTHER-SECOND")
 
     def test_history_failure_rolls_back_asset_id_update(self):
         service = InventoryService(self.repository)

backend/tests/test_inventory_router.py

@@ -15,6 +15,7 @@ from app.inventory.exceptions import (
     MinerNotFound,
 )
 from app.inventory.models import (
+    InventoryAssetIDHistoryEntry,
     InventoryCreateRequest,
     InventoryMetadataUpdateRequest,
     InventoryMinerDetail,
@@ -39,6 +40,9 @@ class StubInventoryService:
         self.update_miner_id: UUID | None = None
         self.update_request: InventoryMetadataUpdateRequest | None = None
         self.update_actor_user_id: UUID | None = None
+        self.history_result: list[InventoryAssetIDHistoryEntry] = []
+        self.history_error: Exception | None = None
+        self.history_miner_id: UUID | None = None
 
     def search_miners(
         self,
@@ -82,6 +86,15 @@ class StubInventoryService:
             raise MinerNotFound(miner_id)
         return self.detail_result
 
+    def get_asset_id_history(
+        self,
+        miner_id: UUID,
+    ) -> list[InventoryAssetIDHistoryEntry]:
+        self.history_miner_id = miner_id
+        if self.history_error is not None:
+            raise self.history_error
+        return self.history_result
+
 
 def miner_summary(miner_id: UUID | None = None) -> InventoryMinerSummary:
     now = datetime.now(timezone.utc)
@@ -106,6 +119,21 @@ def miner_detail(miner_id: UUID | None = None) -> InventoryMinerDetail:
     )
 
 
+def history_entry(
+    *,
+    old_asset_id: str | None,
+    new_asset_id: str,
+    changed_at: datetime,
+) -> InventoryAssetIDHistoryEntry:
+    return InventoryAssetIDHistoryEntry(
+        old_asset_id=old_asset_id,
+        new_asset_id=new_asset_id,
+        changed_at=changed_at,
+        changed_by=UUID("00000000-0000-0000-0000-000000000951"),
+        changed_by_display_name="Inventory Test User",
+    )
+
+
 class InventoryRouterTests(unittest.TestCase):
     def setUp(self):
         self.service = StubInventoryService()
@@ -350,11 +378,26 @@ class InventoryRouterTests(unittest.TestCase):
         self.assertEqual(response.status_code, 401)
         self.assertEqual(response.json()["detail"], "Login required")
 
+    def test_asset_id_history_requires_authentication(self):
+        response = self.client.get(
+            f"/api/inventory/miners/{uuid4()}/asset-id-history"
+        )
+        self.assertEqual(response.status_code, 401)
+        self.assertEqual(response.json()["detail"], "Login required")
+
     def test_list_requires_miners_view_permission(self):
         self.authenticate(permissions=())
         response = self.client.get("/api/inventory/miners")
         self.assertEqual(response.status_code, 403)
 
+    def test_asset_id_history_requires_miners_view_permission(self):
+        self.authenticate(permissions=())
+        response = self.client.get(
+            f"/api/inventory/miners/{uuid4()}/asset-id-history"
+        )
+        self.assertEqual(response.status_code, 403)
+        self.assertIsNone(self.service.history_miner_id)
+
     def test_authenticated_list_returns_typed_envelope(self):
         self.authenticate()
         self.service.search_result = [miner_summary()]
@@ -457,6 +500,80 @@ class InventoryRouterTests(unittest.TestCase):
         response = self.client.get("/api/inventory/miners/not-a-uuid")
         self.assertEqual(response.status_code, 422)
 
+    def test_asset_id_history_malformed_uuid_returns_validation_error(self):
+        self.authenticate()
+        response = self.client.get(
+            "/api/inventory/miners/not-a-uuid/asset-id-history"
+        )
+        self.assertEqual(response.status_code, 422)
+        self.assertIsNone(self.service.history_miner_id)
+
+    def test_asset_id_history_unknown_miner_returns_not_found(self):
+        self.authenticate()
+        miner_id = uuid4()
+        self.service.history_error = MinerNotFound(miner_id)
+
+        response = self.client.get(
+            f"/api/inventory/miners/{miner_id}/asset-id-history"
+        )
+
+        self.assertEqual(response.status_code, 404)
+        self.assertEqual(response.json()["detail"], "Miner not found")
+
+    def test_asset_id_history_empty_collection_uses_typed_envelope(self):
+        self.authenticate()
+        miner_id = uuid4()
+
+        response = self.client.get(
+            f"/api/inventory/miners/{miner_id}/asset-id-history"
+        )
+
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(
+            response.json(),
+            {"data": [], "meta": {}, "error": None},
+        )
+        self.assertEqual(self.service.history_miner_id, miner_id)
+
+    def test_asset_id_history_preserves_chronological_service_order(self):
+        self.authenticate()
+        miner_id = uuid4()
+        first = datetime(2026, 7, 27, 12, 0, tzinfo=timezone.utc)
+        second = datetime(2026, 7, 28, 12, 0, tzinfo=timezone.utc)
+        self.service.history_result = [
+            history_entry(
+                old_asset_id="ASSET-FIRST",
+                new_asset_id="ASSET-SECOND",
+                changed_at=first,
+            ),
+            history_entry(
+                old_asset_id="ASSET-SECOND",
+                new_asset_id="ASSET-FIRST",
+                changed_at=second,
+            ),
+        ]
+
+        response = self.client.get(
+            f"/api/inventory/miners/{miner_id}/asset-id-history"
+        )
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()["data"]
+        self.assertEqual(
+            [entry["new_asset_id"] for entry in data],
+            ["ASSET-SECOND", "ASSET-FIRST"],
+        )
+        self.assertEqual(
+            data[0]["changed_by"],
+            "00000000-0000-0000-0000-000000000951",
+        )
+        self.assertEqual(
+            data[0]["changed_by_display_name"],
+            "Inventory Test User",
+        )
+        self.assertEqual(response.json()["meta"], {})
+        self.assertIsNone(response.json()["error"])
+
     def test_router_has_no_sql_or_database_driver_imports(self):
         router_path = (
             Path(__file__).parents[1] / "app" / "inventory" / "router.py"