feat: optimize table component with deferred search and dynamic container height

frontend/src/components/Table.tsx

@@ -1,4 +1,10 @@
-import React, { useEffect, useMemo, useRef, useState } from "react";
+import React, {
+  useDeferredValue,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
+} from "react";
 import Cookies from "js-cookie";
 import { useQuery } from "@tanstack/react-query";
 import { getTableData, readCachedTableData } from "../utils/userHandler";
@@ -13,6 +19,7 @@ interface DataPackage {
   adresse: string | null;
   plz: string | null;
   email: string | null;
+  _search?: string;
   [key: string]: any;
 }
 
@@ -20,14 +27,29 @@ const Table: React.FC = () => {
   const [rows, setRows] = useState<DataPackage[]>([]); // holds normalized cache view
   const [files, setFiles] = useState<File[]>([]);
   const [search, setSearch] = useState("");
+  const deferredSearch = useDeferredValue(search);
   const containerRef = useRef<HTMLDivElement | null>(null);
   const firstRowRef = useRef<HTMLTableRowElement | null>(null);
   const [rowHeight, setRowHeight] = useState<number>(0);
+  const [containerHeight, setContainerHeight] = useState<number>();
   const [range, setRange] = useState<{ start: number; end: number }>({
     start: 0,
     end: 0,
   });
-  const OVERSCAN = 100; // Render 100 rows above and below the viewport
+  const OVERSCAN = 30; // Render 30 rows above and below the viewport
+
+  // Build a canonical lowercase search text for a row
+  const buildSearchText = (r: DataPackage) =>
+    [
+      r.losnummer,
+      r.vorname ?? "",
+      r.nachname ?? "",
+      r.adresse ?? "",
+      r.plz ?? "",
+      r.email ?? "",
+    ]
+      .join(" ")
+      .toLowerCase();
 
   // Einheitliche Input-Styles (nur Tailwind)
   const inputClasses =
@@ -41,7 +63,9 @@ const Table: React.FC = () => {
       return;
     }
     // Server könnte entweder ein Objekt oder ein Array liefern
-    const normalized: DataPackage[] = Array.isArray(cached) ? cached : [cached];
+    const normalized: DataPackage[] = (
+      Array.isArray(cached) ? cached : [cached]
+    ).map((r: DataPackage) => ({ ...r, _search: buildSearchText(r) }));
     setRows(normalized);
   };
 
@@ -79,22 +103,10 @@ const Table: React.FC = () => {
 
   // Filter rows by search query (case-insensitive)
   const filteredRows = useMemo(() => {
-    const q = search.trim().toLowerCase();
+    const q = deferredSearch.trim().toLowerCase();
     if (!q) return rows;
-    return rows.filter((r) => {
-      const values = [
-        r.losnummer,
-        r.vorname ?? "",
-        r.nachname ?? "",
-        r.adresse ?? "",
-        r.plz ?? "",
-        r.email ?? "",
-      ]
-        .join(" ")
-        .toLowerCase();
-      return values.includes(q);
-    });
-  }, [rows, search]);
+    return rows.filter((r) => (r._search ?? buildSearchText(r)).includes(q));
+  }, [rows, deferredSearch]);
 
   // Measure row height once the first visible row mounts
   useEffect(() => {
@@ -137,6 +149,24 @@ const Table: React.FC = () => {
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [rowHeight, filteredRows.length]);
 
+  // Make the scroll container fill to the bottom of the viewport
+  useEffect(() => {
+    const compute = () => {
+      const el = containerRef.current;
+      if (!el) return;
+      const rect = el.getBoundingClientRect();
+      const available = Math.max(0, window.innerHeight - rect.top - 16); // 16px bottom breathing room
+      if (!containerHeight || Math.abs(available - containerHeight) > 1) {
+        setContainerHeight(available);
+        requestAnimationFrame(recomputeRange);
+      }
+    };
+    compute();
+    window.addEventListener("resize", compute);
+    return () => window.removeEventListener("resize", compute);
+    // Re-evaluate when content above changes size noticeably
+  }, [deferredSearch, rows.length]);
+
   // Recompute range whenever data set changes significantly (search, data load)
   useEffect(() => {
     // Reset scroll position when filter changes to show top of list
@@ -145,7 +175,7 @@ const Table: React.FC = () => {
     // Next frame compute range for new data
     requestAnimationFrame(recomputeRange);
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [search, rows.length]);
+  }, [deferredSearch, rows.length]);
 
   // Handles input changes for table rows
   const handleInputChange = (
@@ -155,7 +185,16 @@ const Table: React.FC = () => {
   ) => {
     setRows((prevRows) =>
       prevRows.map((row) =>
-        row.losnummer === losnummer ? { ...row, [field]: value } : row
+        row.losnummer === losnummer
+          ? {
+              ...row,
+              [field]: value,
+              _search: buildSearchText({
+                ...(row as DataPackage),
+                [field]: value,
+              } as DataPackage),
+            }
+          : row
       )
     );
   };
@@ -196,10 +235,11 @@ const Table: React.FC = () => {
             Refresh
           </button>
         </div>
-        */}
+  */}
         <div
           ref={containerRef}
           className="overflow-auto rounded-lg shadow ring-1 ring-black/5"
+          style={{ height: containerHeight }}
         >
           <table className="min-w-full divide-y divide-gray-200 text-sm">
             <thead className="bg-gray-50 sticky top-0">