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frontend/src/lib/api.ts

@@ -1,6 +1,7 @@
 import type { FeatureMeta, FeatureFilters } from '../types';
 import { INITIAL_RETRY_MS, MAX_RETRY_MS } from './consts';
 import pb from './pocketbase';
+import { getSchoolBackendFeatureName } from './school-filter';
 
 export function logNonAbortError(label: string, error: unknown): void {
   if (error instanceof Error && error.name === 'AbortError') {
@@ -82,8 +83,29 @@ export function buildFilterString(
 ): string {
   const entries = Object.entries(filters);
   if (entries.length === 0) return '';
-  return entries
-    .filter(([name]) => name !== exclude)
+
+  const merged = new Map<string, [number, number] | string[]>();
+  for (const [name, value] of entries) {
+    if (name === exclude) continue;
+    const backendName = getSchoolBackendFeatureName(name) ?? name;
+    const prev = merged.get(backendName);
+    if (
+      prev &&
+      Array.isArray(prev) &&
+      Array.isArray(value) &&
+      typeof prev[0] === 'number' &&
+      typeof value[0] === 'number'
+    ) {
+      merged.set(backendName, [
+        Math.max(prev[0] as number, value[0] as number),
+        Math.min(prev[1] as number, value[1] as number),
+      ]);
+    } else if (!prev) {
+      merged.set(backendName, value);
+    }
+  }
+
+  return [...merged.entries()]
     .map(([name, value]) => {
       const meta = features.find((f) => f.name === name);
       if (meta?.type === 'enum') {