feat(data): removeHistoryEntry supports optional employeeId

js/data.js

@@ -70,6 +70,10 @@ export function addHistoryEntries(state, entries) {
   state.history.sort((a, b) => a.date.localeCompare(b.date));
 }
 
-export function removeHistoryEntry(state, isoDate) {
+export function removeHistoryEntry(state, isoDate, employeeId) {
-  state.history = state.history.filter(h => h.date !== isoDate);
+  if (employeeId === undefined) {
+    state.history = state.history.filter(h => h.date !== isoDate);
+  } else {
+    state.history = state.history.filter(h => !(h.date === isoDate && h.employeeId === employeeId));
+  }
 }

tests/data.test.mjs

@@ -44,4 +44,36 @@ function makeState(history = []) {
   assert.equal(state.history.length, 1, 'empty entries → no change');
 }
 
+// removeHistoryEntry without employeeId: removes all entries on that date
+{
+  const state = makeState([
+    { date: '2026-04-01', employeeId: 'alice', manual: false },
+    { date: '2026-04-01', employeeId: 'bob', manual: false },
+    { date: '2026-04-02', employeeId: 'alice', manual: false }
+  ]);
+  removeHistoryEntry(state, '2026-04-01');
+  assert.equal(state.history.length, 1, 'only 2026-04-02 alice remains');
+  assert.equal(state.history[0].date, '2026-04-02', 'remaining entry is 2026-04-02');
+}
+
+// removeHistoryEntry with employeeId: removes only that one entry
+{
+  const state = makeState([
+    { date: '2026-04-01', employeeId: 'alice', manual: false },
+    { date: '2026-04-01', employeeId: 'bob', manual: false }
+  ]);
+  removeHistoryEntry(state, '2026-04-01', 'alice');
+  assert.equal(state.history.length, 1, 'one entry remains');
+  assert.equal(state.history[0].employeeId, 'bob', 'bob still there');
+}
+
+// removeHistoryEntry with employeeId that does not exist: no-op
+{
+  const state = makeState([
+    { date: '2026-04-01', employeeId: 'alice', manual: false }
+  ]);
+  removeHistoryEntry(state, '2026-04-01', 'nonexistent');
+  assert.equal(state.history.length, 1, 'no change when employeeId not found');
+}
+
 console.log('All data tests passed.');