Add clear GPS endpoint + frontend button

- DELETE /api/assets/{id}/gps sets lat/lng to NULL
- Detail view shows 'Clear GPS' button when asset has GPS coords
- Confirmation modal before clearing
- Tests: 204 success + 404 not found

server.py

@@ -1270,6 +1270,24 @@ def delete_asset(asset_id: int):
     conn.close()
 
 
+@app.delete("/api/assets/{asset_id}/gps", status_code=204)
+def clear_asset_gps(asset_id: int):
+    """Clear GPS coordinates from an asset (sets latitude/longitude to NULL)."""
+    conn = get_db()
+    existing = conn.execute("SELECT id, name FROM assets WHERE id = ?", (asset_id,)).fetchone()
+    if existing is None:
+        conn.close()
+        raise HTTPException(status_code=404, detail="Asset not found")
+    conn.execute(
+        "UPDATE assets SET latitude = NULL, longitude = NULL, updated_at = datetime('now') WHERE id = ?",
+        (asset_id,),
+    )
+    _log_activity(conn, "updated", "asset", asset_id,
+                  f"GPS data cleared for '{existing['name']}'")
+    conn.commit()
+    conn.close()
+
+
 # ─── Task 8: POST /api/checkins ─────────────────────────────────────────────
 
 

static/index.html

@@ -1249,6 +1249,7 @@
       </div>
       <div style="display:flex;gap:8px;margin-bottom:10px;">
         <button class="btn btn-outline btn-sm" onclick="editAsset()" style="flex:1;">✏️ Edit</button>
+        <button class="btn btn-outline btn-sm" id="detailClearGpsBtn" onclick="clearAssetGps()" style="flex:1;display:none;">📍 Clear GPS</button>
         <button class="btn btn-danger btn-sm" onclick="deleteAsset()" style="flex:1;">🗑️ Delete</button>
       </div>
     </div>
@@ -3605,6 +3606,14 @@
           navBtn.style.display = 'none';
         }
 
+        // Clear GPS button — show when asset has GPS
+        const clearGpsBtn = document.getElementById('detailClearGpsBtn');
+        if (a.latitude != null && a.longitude != null) {
+          clearGpsBtn.style.display = '';
+        } else {
+          clearGpsBtn.style.display = 'none';
+        }
+
         // Keys + Badges
         const keys = a.keys || [];
         const badges = a.badges || (Array.isArray(a.badge_names) ? a.badge_names : []);
@@ -3996,6 +4005,24 @@
       }
     }
 
+    // ── Clear GPS ──────────────────────────────────────────────────────────
+    async function clearAssetGps() {
+      if (!AppState.currentAssetId) return;
+      const confirmed = await showModal(
+        'Clear GPS Data',
+        'Remove GPS coordinates from this asset?',
+        'Clear GPS'
+      );
+      if (!confirmed) return;
+      try {
+        await api('/api/assets/' + AppState.currentAssetId + '/gps', { method: 'DELETE' });
+        showToast('GPS data cleared');
+        viewAsset(AppState.currentAssetId);
+      } catch (e) {
+        showToast(e.message, true);
+      }
+    }
+
     // ── Delete ────────────────────────────────────────────────────────────
     async function deleteAsset() {
       if (!AppState.currentAssetId) return;

tests/test_server.py

@@ -432,6 +432,31 @@ class TestDeleteAsset:
         assert response.status_code == 404
 
 
+class TestClearAssetGps:
+    """Clear GPS endpoint."""
+
+    def test_clear_gps_returns_204(self, client):
+        """Clear GPS returns 204 and sets lat/lng to null."""
+        r = client.post("/api/assets", json={
+            "machine_id": "GPS001", "name": "Has GPS",
+            "latitude": 28.5, "longitude": -81.3
+        })
+        asset_id = r.json()["id"]
+        response = client.delete(f"/api/assets/{asset_id}/gps")
+        assert response.status_code == 204
+
+        # Verify lat/lng are cleared
+        r2 = client.get(f"/api/assets/{asset_id}")
+        assert r2.status_code == 200
+        data = r2.json()
+        assert data["latitude"] is None
+        assert data["longitude"] is None
+
+    def test_clear_gps_not_found_returns_404(self, client):
+        response = client.delete("/api/assets/99999/gps")
+        assert response.status_code == 404
+
+
 # ─── Task 7: GET /api/assets/search?machine_id= ───────────────────────────