mytec: after methods

backend/app/api/routes/coverage.py

@@ -132,6 +132,59 @@ async def calculate_coverage(request: CoverageRequest) -> CoverageResponse:
     )
 
 
+@router.post("/preview")
+async def calculate_preview(request: CoverageRequest) -> CoverageResponse:
+    """
+    Fast radial preview using terrain-only along 360 spokes.
+
+    Returns coverage points much faster than full calculation
+    by skipping building/OSM data and using radial spokes instead of grid.
+    """
+    if not request.sites:
+        raise HTTPException(400, "At least one site required")
+
+    site = request.sites[0]
+    effective_settings = apply_preset(request.settings.model_copy())
+
+    env = getattr(effective_settings, 'environment', 'urban')
+    primary_model = select_propagation_model(site.frequency, env)
+    models_used = ["terrain_los", primary_model.name]
+
+    start_time = time.time()
+
+    try:
+        points = await asyncio.wait_for(
+            coverage_service.calculate_radial_preview(
+                site, request.settings,
+            ),
+            timeout=30.0,
+        )
+    except asyncio.TimeoutError:
+        raise HTTPException(408, "Preview timeout (30s)")
+
+    computation_time = time.time() - start_time
+
+    rsrp_values = [p.rsrp for p in points]
+    los_count = sum(1 for p in points if p.has_los)
+
+    stats = {
+        "min_rsrp": min(rsrp_values) if rsrp_values else 0,
+        "max_rsrp": max(rsrp_values) if rsrp_values else 0,
+        "avg_rsrp": sum(rsrp_values) / len(rsrp_values) if rsrp_values else 0,
+        "los_percentage": (los_count / len(points) * 100) if points else 0,
+        "mode": "radial_preview",
+    }
+
+    return CoverageResponse(
+        points=points,
+        count=len(points),
+        settings=effective_settings,
+        stats=stats,
+        computation_time=round(computation_time, 2),
+        models_used=models_used,
+    )
+
+
 @router.get("/presets")
 async def get_presets():
     """Get available propagation model presets"""

backend/app/api/routes/system.py

@@ -1,10 +1,16 @@
 import os
+import json
 import asyncio
 import multiprocessing as mp
+from pathlib import Path
 from fastapi import APIRouter
 
 router = APIRouter()
 
+# Valid SRTM tile sizes (bytes)
+_SRTM1_SIZE = 3601 * 3601 * 2  # 25,934,402
+_SRTM3_SIZE = 1201 * 1201 * 2  #  2,884,802
+
 
 @router.get("/info")
 async def get_system_info():
@@ -72,3 +78,108 @@ async def shutdown():
     loop.call_later(3.0, lambda: os._exit(0))
 
     return {"status": "shutting down", "workers_killed": killed}
+
+
+@router.get("/diagnostics")
+async def get_diagnostics():
+    """Validate terrain tiles and OSM cache files.
+
+    Checks:
+    - Terrain .hgt files: must be exactly SRTM1 or SRTM3 size
+    - OSM cache .json files: must be valid JSON with expected structure
+    - Cache manager stats (memory + disk)
+    """
+    data_path = Path(os.environ.get('RFCP_DATA_PATH', './data'))
+    terrain_path = data_path / 'terrain'
+    osm_dirs = [
+        data_path / 'osm' / 'buildings',
+        data_path / 'osm' / 'streets',
+        data_path / 'osm' / 'vegetation',
+        data_path / 'osm' / 'water',
+    ]
+
+    # --- Terrain tiles ---
+    terrain_tiles = []
+    terrain_errors = []
+    total_terrain_bytes = 0
+
+    if terrain_path.exists():
+        for hgt in sorted(terrain_path.glob("*.hgt")):
+            size = hgt.stat().st_size
+            total_terrain_bytes += size
+            if size == _SRTM1_SIZE:
+                terrain_tiles.append({"name": hgt.name, "type": "SRTM1", "size": size})
+            elif size == _SRTM3_SIZE:
+                terrain_tiles.append({"name": hgt.name, "type": "SRTM3", "size": size})
+            else:
+                terrain_errors.append({
+                    "name": hgt.name,
+                    "size": size,
+                    "error": f"Invalid size (expected {_SRTM1_SIZE} or {_SRTM3_SIZE})",
+                })
+
+    # --- OSM cache ---
+    osm_files = []
+    osm_errors = []
+    total_osm_bytes = 0
+
+    for osm_dir in osm_dirs:
+        if not osm_dir.exists():
+            continue
+        category = osm_dir.name
+        for jf in sorted(osm_dir.glob("*.json")):
+            fsize = jf.stat().st_size
+            total_osm_bytes += fsize
+            try:
+                data = json.loads(jf.read_text())
+                has_timestamp = '_cached_at' in data or '_ts' in data
+                has_data = 'data' in data or 'v' in data
+                if has_timestamp and has_data:
+                    osm_files.append({
+                        "name": jf.name,
+                        "category": category,
+                        "size": fsize,
+                        "valid": True,
+                    })
+                else:
+                    osm_errors.append({
+                        "name": jf.name,
+                        "category": category,
+                        "size": fsize,
+                        "error": "Missing expected keys (_cached_at/data or _ts/v)",
+                    })
+            except json.JSONDecodeError as e:
+                osm_errors.append({
+                    "name": jf.name,
+                    "category": category,
+                    "size": fsize,
+                    "error": f"Invalid JSON: {e}",
+                })
+
+    # --- Cache manager stats ---
+    try:
+        from app.services.cache import cache_manager
+        cache_stats = cache_manager.stats()
+    except Exception:
+        cache_stats = None
+
+    return {
+        "data_path": str(data_path),
+        "terrain": {
+            "path": str(terrain_path),
+            "exists": terrain_path.exists(),
+            "tile_count": len(terrain_tiles),
+            "error_count": len(terrain_errors),
+            "total_mb": round(total_terrain_bytes / (1024 * 1024), 1),
+            "tiles": terrain_tiles,
+            "errors": terrain_errors,
+        },
+        "osm_cache": {
+            "valid_count": len(osm_files),
+            "error_count": len(osm_errors),
+            "total_mb": round(total_osm_bytes / (1024 * 1024), 1),
+            "files": osm_files,
+            "errors": osm_errors,
+        },
+        "cache_manager": cache_stats,
+    }