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+# Pagination & Day Grouping Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add offset-based pagination and day-grouped session rendering to the History page.
+
+**Architecture:** Backend adds `offset` param and `X-Prev-Last-Date` header to `GET /sessions`. Frontend adds page state, groups sessions by local date at render time with styled day headers, and renders a Prev/Next pagination bar.
+
+**Tech Stack:** Node.js/Express/better-sqlite3 (backend), React/Tailwind CSS (frontend), Jest/supertest (tests)
+
+---
+
+### Task 1: Backend — Add `offset` param and `X-Prev-Last-Date` header
+
+**Files:**
+- Modify: `backend/routes/sessions.js:22-76` (the `GET /` handler)
+- Test: `tests/api/session-archive.test.js` (add new tests to the existing `GET /api/sessions` describe block)
+
+- [ ] **Step 1: Write failing tests for `offset` and `X-Prev-Last-Date`**
+
+Add these tests at the end of the `GET /api/sessions — filter and limit` describe block in `tests/api/session-archive.test.js`:
+
+```javascript
+test('offset skips the first N sessions', async () => {
+  for (let i = 0; i < 5; i++) {
+    seedSession({ is_active: 0, notes: null });
+  }
+
+  const allRes = await request(app).get('/api/sessions?filter=all&limit=all');
+  const offsetRes = await request(app).get('/api/sessions?filter=all&limit=2&offset=2');
+  expect(offsetRes.status).toBe(200);
+  expect(offsetRes.body).toHaveLength(2);
+  expect(offsetRes.body[0].id).toBe(allRes.body[2].id);
+  expect(offsetRes.body[1].id).toBe(allRes.body[3].id);
+});
+
+test('offset defaults to 0 when not provided', async () => {
+  for (let i = 0; i < 3; i++) {
+    seedSession({ is_active: 0, notes: null });
+  }
+
+  const res = await request(app).get('/api/sessions?filter=all&limit=2');
+  expect(res.status).toBe(200);
+  expect(res.body).toHaveLength(2);
+});
+
+test('negative offset is clamped to 0', async () => {
+  seedSession({ is_active: 0, notes: null });
+
+  const res = await request(app).get('/api/sessions?filter=all&offset=-5');
+  expect(res.status).toBe(200);
+  expect(res.body).toHaveLength(1);
+});
+
+test('non-numeric offset is clamped to 0', async () => {
+  seedSession({ is_active: 0, notes: null });
+
+  const res = await request(app).get('/api/sessions?filter=all&offset=abc');
+  expect(res.status).toBe(200);
+  expect(res.body).toHaveLength(1);
+});
+
+test('offset past end returns empty array', async () => {
+  seedSession({ is_active: 0, notes: null });
+
+  const res = await request(app).get('/api/sessions?filter=all&limit=5&offset=100');
+  expect(res.status).toBe(200);
+  expect(res.body).toHaveLength(0);
+  expect(res.headers['x-total-count']).toBe('1');
+});
+
+test('X-Prev-Last-Date header is set with correct value when offset > 0', async () => {
+  for (let i = 0; i < 5; i++) {
+    seedSession({ is_active: 0, notes: null });
+  }
+
+  const allRes = await request(app).get('/api/sessions?filter=all&limit=all');
+  const res = await request(app).get('/api/sessions?filter=all&limit=2&offset=2');
+  expect(res.headers['x-prev-last-date']).toBe(allRes.body[1].created_at);
+});
+
+test('X-Prev-Last-Date header is absent when offset is 0', async () => {
+  seedSession({ is_active: 0, notes: null });
+
+  const res = await request(app).get('/api/sessions?filter=all&limit=2');
+  expect(res.headers['x-prev-last-date']).toBeUndefined();
+});
+
+test('X-Total-Count is unaffected by offset', async () => {
+  for (let i = 0; i < 10; i++) {
+    seedSession({ is_active: 0, notes: null });
+  }
+
+  const res = await request(app).get('/api/sessions?filter=all&limit=3&offset=6');
+  expect(res.headers['x-total-count']).toBe('10');
+  expect(res.body).toHaveLength(3);
+});
+
+test('offset works with filter=default', async () => {
+  for (let i = 0; i < 5; i++) {
+    seedSession({ is_active: 0, notes: null });
+  }
+  const archived = seedSession({ is_active: 0, notes: null });
+  require('../helpers/test-utils').db.prepare(
+    'UPDATE sessions SET archived = 1 WHERE id = ?'
+  ).run(archived.id);
+
+  const res = await request(app).get('/api/sessions?filter=default&limit=2&offset=2');
+  expect(res.status).toBe(200);
+  expect(res.body).toHaveLength(2);
+  expect(res.headers['x-total-count']).toBe('5');
+  res.body.forEach(s => expect(s.archived).toBe(0));
+});
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+Run: `npx jest tests/api/session-archive.test.js --no-coverage --forceExit`
+Expected: 9 new tests FAIL (offset is not yet implemented)
+
+- [ ] **Step 3: Implement offset and X-Prev-Last-Date in the GET handler**
+
+In `backend/routes/sessions.js`, modify the `router.get('/')` handler (lines 22-76). After parsing `limitParam` (line 25), add offset parsing:
+
+```javascript
+const offsetParam = req.query.offset || '0';
+let offset = parseInt(offsetParam, 10);
+if (isNaN(offset) || offset < 0) offset = 0;
+```
+
+After the `limitClause` block (line 46), build the offset clause:
+
+```javascript
+let offsetClause = '';
+if (offset > 0) {
+  offsetClause = `OFFSET ${offset}`;
+}
+```
+
+Update the sessions query (line 62) to include `${offsetClause}` after `${limitClause}`:
+
+```sql
+ORDER BY s.created_at DESC
+${limitClause}
+${offsetClause}
+```
+
+Before `res.set('X-Total-Count', ...)`, add the `X-Prev-Last-Date` logic:
+
+```javascript
+if (offset > 0) {
+  const prevRow = db.prepare(`
+    SELECT s.created_at
+    FROM sessions s
+    ${whereClause}
+    ORDER BY s.created_at DESC
+    LIMIT 1 OFFSET ${offset - 1}
+  `).get();
+  if (prevRow) {
+    res.set('X-Prev-Last-Date', prevRow.created_at);
+  }
+}
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `npx jest tests/api/session-archive.test.js --no-coverage --forceExit`
+Expected: ALL tests pass (24 existing + 9 new = 33)
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add backend/routes/sessions.js tests/api/session-archive.test.js
+git commit -m "feat: add offset pagination and X-Prev-Last-Date header to GET /sessions"
+```
+
+---
+
+### Task 2: Frontend — Date utility helpers
+
+**Files:**
+- Modify: `frontend/src/utils/dateUtils.js`
+
+- [ ] **Step 1: Add `getLocalDateKey` and `formatDayHeader` helpers**
+
+Append to `frontend/src/utils/dateUtils.js`:
+
+```javascript
+/**
+ * Get a locale-independent date key for grouping sessions by local calendar day
+ * @param {string} sqliteTimestamp
+ * @returns {string} - e.g., "2026-03-23"
+ */
+export function getLocalDateKey(sqliteTimestamp) {
+  const d = parseUTCTimestamp(sqliteTimestamp);
+  const year = d.getFullYear();
+  const month = String(d.getMonth() + 1).padStart(2, '0');
+  const day = String(d.getDate()).padStart(2, '0');
+  return `${year}-${month}-${day}`;
+}
+
+/**
+ * Format a SQLite timestamp as a day header string (e.g., "Sunday, Mar 23, 2026")
+ * @param {string} sqliteTimestamp
+ * @returns {string}
+ */
+export function formatDayHeader(sqliteTimestamp) {
+  const d = parseUTCTimestamp(sqliteTimestamp);
+  return d.toLocaleDateString(undefined, {
+    weekday: 'long',
+    year: 'numeric',
+    month: 'short',
+    day: 'numeric',
+  });
+}
+
+/**
+ * Format a SQLite timestamp as a time-only string (e.g., "7:30 PM")
+ * @param {string} sqliteTimestamp
+ * @returns {string}
+ */
+export function formatTimeOnly(sqliteTimestamp) {
+  const d = parseUTCTimestamp(sqliteTimestamp);
+  return d.toLocaleTimeString(undefined, {
+    hour: 'numeric',
+    minute: '2-digit',
+  });
+}
+```
+
+- [ ] **Step 2: Verify frontend builds**
+
+Run: `cd frontend && npm run build`
+Expected: Build succeeds with no errors
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add frontend/src/utils/dateUtils.js
+git commit -m "feat: add getLocalDateKey, formatDayHeader, formatTimeOnly date helpers"
+```
+
+---
+
+### Task 3: Frontend — Pagination state and API integration
+
+**Files:**
+- Modify: `frontend/src/pages/History.jsx:14-75` (state declarations and `loadSessions`)
+
+- [ ] **Step 1: Add page state and update loadSessions**
+
+In `History.jsx`, add state after line 17 (`absoluteTotal`):
+
+```javascript
+const [page, setPage] = useState(1);
+const [prevLastDate, setPrevLastDate] = useState(null);
+```
+
+Update `loadSessions` (the `api.get` call around line 32) to pass `offset`:
+
+```javascript
+const limitNum = limit === 'all' ? null : parseInt(limit, 10);
+const offset = limitNum ? (page - 1) * limitNum : 0;
+
+const response = await api.get('/sessions', {
+  params: { filter, limit, offset: offset || undefined }
+});
+```
+
+After setting `absoluteTotal`, add:
+
+```javascript
+setPrevLastDate(response.headers['x-prev-last-date'] || null);
+```
+
+Add `page` to the `useCallback` dependency array for `loadSessions`.
+
+- [ ] **Step 2: Add page reset logic**
+
+Update `handleFilterChange` and `handleLimitChange` to reset page:
+
+```javascript
+const handleFilterChange = (newFilter) => {
+  setFilter(newFilter);
+  localStorage.setItem(prefixKey(adminName, 'history-filter'), newFilter);
+  setSelectedIds(new Set());
+  setPage(1);
+};
+
+const handleLimitChange = (newLimit) => {
+  setLimit(newLimit);
+  localStorage.setItem(prefixKey(adminName, 'history-show-limit'), newLimit);
+  setSelectedIds(new Set());
+  setPage(1);
+};
+```
+
+Add auto-reset when page becomes empty. Place this check **after** all state updates (`setSessions`, `setTotalCount`, `setAbsoluteTotal`, `setPrevLastDate`) to avoid stale state:
+
+```javascript
+setSessions(response.data);
+setTotalCount(parseInt(response.headers['x-total-count'] || '0', 10));
+setAbsoluteTotal(parseInt(response.headers['x-absolute-total'] || '0', 10));
+setPrevLastDate(response.headers['x-prev-last-date'] || null);
+
+if (response.data.length === 0 && offset > 0) {
+  setPage(1);
+}
+```
+
+Also add `setPage(1)` to `exitSelectMode`:
+
+```javascript
+const exitSelectMode = () => {
+  setSelectMode(false);
+  setSelectedIds(new Set());
+  setShowBulkDeleteConfirm(false);
+  setPage(1);
+};
+```
+
+And in the select mode toggle button's `onClick` (where `setSelectMode(true)` is called), add `setPage(1)` after it. Similarly in `handlePointerDown` where `setSelectMode(true)` is called, add `setPage(1)` after it.
+
+- [ ] **Step 3: Verify frontend builds**
+
+Run: `cd frontend && npm run build`
+Expected: Build succeeds
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add frontend/src/pages/History.jsx
+git commit -m "feat: add pagination state and offset to session API calls"
+```
+
+---
+
+### Task 4: Frontend — Day grouping rendering
+
+**Files:**
+- Modify: `frontend/src/pages/History.jsx:1-8` (imports) and `208-316` (session list rendering)
+
+- [ ] **Step 1: Update imports**
+
+Replace the `dateUtils` import at line 6:
+
+```javascript
+import { formatDayHeader, formatTimeOnly, getLocalDateKey, isSunday } from '../utils/dateUtils';
+```
+
+(Remove `formatLocalDate` since session cards will now show time-only under day headers.)
+
+- [ ] **Step 2: Add grouping logic and render day headers**
+
+Replace the session list rendering section (`{sessions.map(session => { ... })}`) with day-grouped rendering. The grouping is computed at render time using `useMemo`:
+
+Add before the `return` statement (above `if (loading)`):
+
+```javascript
+const groupedSessions = useMemo(() => {
+  const groups = [];
+  let currentKey = null;
+
+  sessions.forEach(session => {
+    const dateKey = getLocalDateKey(session.created_at);
+    if (dateKey !== currentKey) {
+      currentKey = dateKey;
+      groups.push({ dateKey, sessions: [session] });
+    } else {
+      groups[groups.length - 1].sessions.push(session);
+    }
+  });
+
+  return groups;
+}, [sessions]);
+```
+
+Add `useMemo` to the React import at line 1.
+
+Replace the `{sessions.map(session => { ... })}` block inside `<div className="space-y-2">` with:
+
+```jsx
+{groupedSessions.map((group, groupIdx) => {
+  const isSundayGroup = isSunday(group.sessions[0].created_at);
+  const isContinued = groupIdx === 0 && page > 1 && prevLastDate &&
+    getLocalDateKey(prevLastDate) === group.dateKey;
+
+  return (
+    <div key={group.dateKey}>
+      {/* Day header bar */}
+      <div className="bg-gray-100 dark:bg-[#1e2a3a] rounded-md px-3.5 py-2 mb-2 flex justify-between items-center border-l-[3px] border-indigo-500">
+        <div className="flex items-center gap-2">
+          <span className="text-sm font-semibold text-indigo-700 dark:text-indigo-300">
+            {formatDayHeader(group.sessions[0].created_at)}
+          </span>
+          {isContinued && (
+            <span className="text-xs text-gray-400 dark:text-gray-500 italic">(continued)</span>
+          )}
+        </div>
+        {!isContinued && (
+          <div className="flex items-center gap-2">
+            <span className="text-xs text-gray-500 dark:text-gray-400">
+              {group.sessions.length} session{group.sessions.length !== 1 ? 's' : ''}
+            </span>
+            {isSundayGroup && (
+              <span className="text-xs font-semibold text-amber-700 dark:text-amber-300">🎲 Game Night</span>
+            )}
+          </div>
+        )}
+      </div>
+
+      {/* Session cards under this day */}
+      <div className="ml-3 space-y-1.5 mb-4">
+        {group.sessions.map(session => {
+          const isActive = session.is_active === 1;
+          const isSelected = selectedIds.has(session.id);
+          const isArchived = session.archived === 1;
+          const canSelect = selectMode && !isActive;
+
+          return (
+            <div
+              key={session.id}
+              className={`border rounded-lg transition ${
+                selectMode && isActive
+                  ? 'opacity-50 cursor-not-allowed border-gray-300 dark:border-gray-600'
+                  : isSelected
+                    ? 'border-indigo-500 bg-indigo-50 dark:bg-indigo-900/20 cursor-pointer'
+                    : 'border-gray-300 dark:border-gray-600 hover:border-indigo-400 dark:hover:border-indigo-500 cursor-pointer'
+              }`}
+              onClick={() => {
+                if (longPressFired.current) {
+                  longPressFired.current = false;
+                  return;
+                }
+                if (selectMode) {
+                  if (!isActive) toggleSelection(session.id);
+                } else {
+                  navigate(`/history/${session.id}`);
+                }
+              }}
+              onPointerDown={() => {
+                if (!isActive) handlePointerDown(session.id);
+              }}
+              onPointerUp={handlePointerUp}
+              onPointerLeave={handlePointerUp}
+            >
+              <div className="p-4">
+                <div className="flex items-start gap-3">
+                  {selectMode && (
+                    <div className={`mt-0.5 w-5 h-5 flex-shrink-0 rounded border-2 flex items-center justify-center ${
+                      isActive
+                        ? 'border-gray-300 dark:border-gray-600 bg-gray-100 dark:bg-gray-700'
+                        : isSelected
+                          ? 'border-indigo-600 bg-indigo-600'
+                          : 'border-gray-300 dark:border-gray-600'
+                    }`}>
+                      {isSelected && (
+                        <span className="text-white text-xs font-bold">✓</span>
+                      )}
+                    </div>
+                  )}
+                  <div className="flex-1 min-w-0">
+                    <div className="flex justify-between items-center mb-1">
+                      <div className="flex items-center gap-2 flex-wrap">
+                        <span className="font-semibold text-gray-800 dark:text-gray-100">
+                          Session #{session.id}
+                        </span>
+                        {isActive && (
+                          <span className="bg-green-100 dark:bg-green-900 text-green-800 dark:text-green-200 text-xs px-2 py-0.5 rounded">
+                            Active
+                          </span>
+                        )}
+                        {isArchived && (filter === 'all' || filter === 'archived') && (
+                          <span className="bg-gray-100 dark:bg-gray-700 text-gray-500 dark:text-gray-400 text-xs px-2 py-0.5 rounded">
+                            Archived
+                          </span>
+                        )}
+                      </div>
+                      <span className="text-sm text-gray-500 dark:text-gray-400">
+                        {session.games_played} game{session.games_played !== 1 ? 's' : ''}
+                      </span>
+                    </div>
+                    <div className="text-sm text-gray-500 dark:text-gray-400">
+                      {formatTimeOnly(session.created_at)}
+                    </div>
+                    {session.has_notes && session.notes_preview && (
+                      <div className="mt-2 text-sm text-indigo-400 dark:text-indigo-300 bg-indigo-50 dark:bg-indigo-900/20 px-3 py-2 rounded border-l-2 border-indigo-500">
+                        {session.notes_preview}
+                      </div>
+                    )}
+                  </div>
+                </div>
+              </div>
+
+              {!selectMode && isAuthenticated && isActive && (
+                <div className="px-4 pb-4 pt-0">
+                  <button
+                    onClick={(e) => {
+                      e.stopPropagation();
+                      setClosingSession(session.id);
+                    }}
+                    className="w-full bg-orange-600 dark:bg-orange-700 text-white px-4 py-2 rounded text-sm hover:bg-orange-700 dark:hover:bg-orange-800 transition"
+                  >
+                    End Session
+                  </button>
+                </div>
+              )}
+            </div>
+          );
+        })}
+      </div>
+    </div>
+  );
+})}
+```
+
+Each session card inside the group keeps its existing structure (selection, badges, notes preview, etc.) but:
+- The date line changes from `formatLocalDate(session.created_at)` to `formatTimeOnly(session.created_at)`
+- Remove the per-card `isSundaySession` badge (`🎲 Game Night` span) and the `· Sunday` text — these are now on the day header
+- Remove the `isSundaySession` const from inside the card map — it's computed per-group instead
+
+- [ ] **Step 3: Verify frontend builds**
+
+Run: `cd frontend && npm run build`
+Expected: Build succeeds
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add frontend/src/pages/History.jsx
+git commit -m "feat: render sessions grouped by day with styled header bars"
+```
+
+---
+
+### Task 5: Frontend — Pagination bar
+
+**Files:**
+- Modify: `frontend/src/pages/History.jsx` (add pagination bar below session list, above multi-select action bar)
+
+- [ ] **Step 1: Add pagination bar JSX**
+
+After the closing `</div>` of `<div className="space-y-2">` (the session list) and before the multi-select action bar `{selectMode && selectedIds.size > 0 && (`, add:
+
+```jsx
+{/* Pagination bar */}
+{limit !== 'all' && (() => {
+  const limitNum = parseInt(limit, 10);
+  const totalPages = Math.ceil(totalCount / limitNum);
+  if (totalPages <= 1) return null;
+  return (
+    <div className="flex justify-center items-center gap-4 py-3 mt-3 border-t border-gray-200 dark:border-gray-700">
+      <button
+        onClick={() => { setPage(p => p - 1); setSelectedIds(new Set()); }}
+        disabled={page <= 1}
+        className={`px-4 py-1.5 rounded-md text-sm font-medium transition ${
+          page <= 1
+            ? 'bg-gray-600 dark:bg-gray-700 text-gray-400 dark:text-gray-500 cursor-not-allowed'
+            : 'bg-indigo-600 text-white hover:bg-indigo-700'
+        }`}
+      >
+        ← Prev
+      </button>
+      <span className="text-sm text-gray-500 dark:text-gray-400">
+        Page {page} of {totalPages}
+      </span>
+      <button
+        onClick={() => { setPage(p => p + 1); setSelectedIds(new Set()); }}
+        disabled={page >= totalPages}
+        className={`px-4 py-1.5 rounded-md text-sm font-medium transition ${
+          page >= totalPages
+            ? 'bg-gray-600 dark:bg-gray-700 text-gray-400 dark:text-gray-500 cursor-not-allowed'
+            : 'bg-indigo-600 text-white hover:bg-indigo-700'
+        }`}
+      >
+        Next →
+      </button>
+    </div>
+  );
+})()}
+```
+
+- [ ] **Step 2: Verify frontend builds**
+
+Run: `cd frontend && npm run build`
+Expected: Build succeeds
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add frontend/src/pages/History.jsx
+git commit -m "feat: add Prev/Next pagination bar to session history"
+```
+
+---
+
+### Task 6: Final verification
+
+**Files:** None (verification only)
+
+- [ ] **Step 1: Run full backend test suite**
+
+Run: `npx jest --no-coverage --forceExit`
+Expected: All tests pass (147 existing + 9 new = 156)
+
+- [ ] **Step 2: Verify frontend build**
+
+Run: `cd frontend && npm run build`
+Expected: Clean build, no warnings
+
+- [ ] **Step 3: Final commit if any cleanup needed**