fix(ingestion): name the district and commodity on signal endpoints

The console's mandi and climate tables read districtName and commodityName;
the endpoints returned districtId and commodityId, so every row rendered
blank against a real backend. It went unnoticed because until today
nothing had ever run and the screen only ever showed its demo fallback.

Names are added alongside the entity's own fields, so a screen does not
need the whole master list to render one row. Climate keys now match the
UI's contract exactly (tmaxC, hotDays, rainfallAnomalyPct).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/main/java/com/lincfusion/udyamlinc/ingestion/IngestionController.java

@@ -2,6 +2,7 @@ package com.lincfusion.udyamlinc.ingestion;
 
 import com.lincfusion.udyamlinc.common.ApiResponse;
 import com.lincfusion.udyamlinc.master.District;
+import com.lincfusion.udyamlinc.master.CommodityRepository;
 import com.lincfusion.udyamlinc.master.DistrictRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.PageRequest;
@@ -31,6 +32,7 @@ public class IngestionController {
     private final ClimateSignalRepository climateSignalRepository;
     private final ApiLogRepository apiLogRepository;
     private final DistrictRepository districtRepository;
+    private final CommodityRepository commodityRepository;
 
     // ── what ran ────────────────────────────────────────────
 
@@ -54,16 +56,66 @@ public class IngestionController {
 
     // ── what it wrote ───────────────────────────────────────
 
+    /**
+     * Signals with their district and commodity named, not as foreign keys.
+     *
+     * <p>The console shows a mandi table, and a screen that has to resolve ids
+     * itself would need the whole master list to render one row. The entity's own
+     * fields are passed through unchanged alongside the names.
+     */
     @GetMapping("/signals/market")
-    public ApiResponse<List<MarketSignal>> marketSignals(@RequestParam(defaultValue = "12") int weeks) {
-        return ApiResponse.ok(marketSignalRepository
-                .findByWeekStartGreaterThanEqualOrderByWeekStartDesc(Weeks.startOf(LocalDate.now()).minusWeeks(weeks)));
+    public ApiResponse<List<Map<String, Object>>> marketSignals(@RequestParam(defaultValue = "12") int weeks) {
+        Map<Long, String> districts = new java.util.HashMap<>();
+        districtRepository.findAll().forEach(d -> districts.put(d.getId(), d.getName()));
+        Map<Long, String> commodities = new java.util.HashMap<>();
+        commodityRepository.findAll().forEach(c -> commodities.put(c.getId(), c.getName()));
+
+        List<Map<String, Object>> out = new ArrayList<>();
+        for (MarketSignal signal : marketSignalRepository
+                .findByWeekStartGreaterThanEqualOrderByWeekStartDesc(Weeks.startOf(LocalDate.now()).minusWeeks(weeks))) {
+            Map<String, Object> row = new java.util.LinkedHashMap<>();
+            row.put("id", signal.getId());
+            row.put("districtName", districts.getOrDefault(signal.getDistrictId(), "—"));
+            row.put("commodityName", commodities.getOrDefault(signal.getCommodityId(), "—"));
+            row.put("weekStart", signal.getWeekStart());
+            row.put("modalPrice", signal.getModalPrice());
+            row.put("minPrice", signal.getMinPrice());
+            row.put("maxPrice", signal.getMaxPrice());
+            row.put("arrivalCount", signal.getArrivalCount());
+            row.put("unit", signal.getUnit());
+            row.put("source", signal.getSource());
+            row.put("validForDate", signal.getValidForDate());
+            row.put("observedAt", signal.getObservedAt());
+            out.add(row);
+        }
+        return ApiResponse.ok(out);
     }
 
     @GetMapping("/signals/climate")
-    public ApiResponse<List<ClimateSignal>> climateSignals(@RequestParam(defaultValue = "12") int weeks) {
-        return ApiResponse.ok(climateSignalRepository
-                .findByWeekStartGreaterThanEqualOrderByWeekStartDesc(Weeks.startOf(LocalDate.now()).minusWeeks(weeks)));
+    public ApiResponse<List<Map<String, Object>>> climateSignals(@RequestParam(defaultValue = "12") int weeks) {
+        Map<Long, String> districts = new java.util.HashMap<>();
+        districtRepository.findAll().forEach(d -> districts.put(d.getId(), d.getName()));
+
+        List<Map<String, Object>> out = new ArrayList<>();
+        for (ClimateSignal signal : climateSignalRepository
+                .findByWeekStartGreaterThanEqualOrderByWeekStartDesc(Weeks.startOf(LocalDate.now()).minusWeeks(weeks))) {
+            Map<String, Object> row = new java.util.LinkedHashMap<>();
+            row.put("id", signal.getId());
+            row.put("districtName", districts.getOrDefault(signal.getDistrictId(), "—"));
+            row.put("weekStart", signal.getWeekStart());
+            row.put("isoWeek", signal.getIsoWeek());
+            row.put("rainfallMm", signal.getRainfallMm());
+            row.put("rainfallNormalMm", signal.getRainfallNormalMm());
+            row.put("rainfallAnomalyPct", signal.getRainfallAnomalyPct());
+            row.put("tmaxC", signal.getTmaxC());
+            row.put("tmaxNormalC", signal.getTmaxNormalC());
+            row.put("heatAnomalyC", signal.getHeatAnomalyC());
+            row.put("hotDays", signal.getHotDays());
+            row.put("validForDate", signal.getValidForDate());
+            row.put("observedAt", signal.getObservedAt());
+            out.add(row);
+        }
+        return ApiResponse.ok(out);
     }
 
     /**