Add pagination to QSO Log and back buttons to pages

- Add backend pagination support for /api/qsos endpoint (page, limit params)
- Return paginated results with metadata (totalCount, totalPages, hasNext, hasPrev)
- Add pagination UI to QSOs page with prev/next buttons and page numbers
- Add back button to QSO Log and Settings pages linking to main menu
- Reset to page 1 when applying filters

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/backend/index.js

@@ -391,6 +391,7 @@ const app = new Elysia()
   /**
    * GET /api/qsos
    * Get user's QSOs (requires authentication)
+   * Supports pagination: ?page=1&limit=100
    */
   .get('/api/qsos', async ({ user, query, set }) => {
     if (!user) {
@@ -404,12 +405,17 @@ const app = new Elysia()
       if (query.mode) filters.mode = query.mode;
       if (query.confirmed) filters.confirmed = query.confirmed === 'true';
 
-      const qsos = await getUserQSOs(user.id, filters);
+      // Pagination options
+      const options = {
+        page: query.page ? parseInt(query.page) : 1,
+        limit: query.limit ? parseInt(query.limit) : 100,
+      };
+
+      const result = await getUserQSOs(user.id, filters, options);
 
       return {
         success: true,
-        qsos,
-        count: qsos.length,
+        ...result,
       };
     } catch (error) {
       set.status = 500;

src/backend/services/lotw.service.js

@@ -468,15 +468,18 @@ export async function syncQSOs(userId, lotwUsername, lotwPassword, sinceDate = n
 }
 
 /**
- * Get QSOs for a user
+ * Get QSOs for a user with pagination
  * @param {number} userId - User ID
  * @param {Object} filters - Query filters
- * @returns {Promise<Array>} Array of QSOs
+ * @param {Object} options - Pagination options { page, limit }
+ * @returns {Promise<Object>} Paginated QSOs
  */
-export async function getUserQSOs(userId, filters = {}) {
-  const { eq, and } = await import('drizzle-orm');
+export async function getUserQSOs(userId, filters = {}, options = {}) {
+  const { eq, and, desc, sql } = await import('drizzle-orm');
 
-  console.error('getUserQSOs called with userId:', userId, 'filters:', filters);
+  const { page = 1, limit = 100 } = options;
+
+  console.error('getUserQSOs called with userId:', userId, 'filters:', filters, 'page:', page, 'limit:', limit);
 
   // Build where conditions
   const conditions = [eq(qsos.userId, userId)];
@@ -493,17 +496,35 @@ export async function getUserQSOs(userId, filters = {}) {
     conditions.push(eq(qsos.lotwQslRstatus, 'Y'));
   }
 
-  // Use and() to combine all conditions
-  const results = await db.select().from(qsos).where(and(...conditions));
+  // Get total count for pagination
+  const allResults = await db.select().from(qsos).where(and(...conditions));
+  const totalCount = allResults.length;
 
-  console.error('getUserQSOs returning', results.length, 'QSOs');
+  // Calculate offset
+  const offset = (page - 1) * limit;
 
-  // Order by date descending, then time
-  return results.sort((a, b) => {
-    const dateCompare = b.qsoDate.localeCompare(a.qsoDate);
-    if (dateCompare !== 0) return dateCompare;
-    return b.timeOn.localeCompare(a.timeOn);
-  });
+  // Get paginated results
+  const results = await db
+    .select()
+    .from(qsos)
+    .where(and(...conditions))
+    .orderBy(desc(qsos.qsoDate), desc(qsos.timeOn))
+    .limit(limit)
+    .offset(offset);
+
+  console.error('getUserQSOs returning', results.length, 'QSOs (page', page, 'of', Math.ceil(totalCount / limit), ')');
+
+  return {
+    qsos: results,
+    pagination: {
+      page,
+      limit,
+      totalCount,
+      totalPages: Math.ceil(totalCount / limit),
+      hasNext: page * limit < totalCount,
+      hasPrev: page > 1,
+    },
+  };
 }
 
 /**

src/frontend/src/routes/qsos/+page.svelte

@@ -8,6 +8,11 @@
   let loading = true;
   let error = null;
 
+  // Pagination state
+  let currentPage = 1;
+  let pageSize = 100;
+  let pagination = null;
+
   // Job polling state
   let syncJobId = null;
   let syncStatus = null;
@@ -51,8 +56,12 @@
       if (filters.mode) activeFilters.mode = filters.mode;
       if (filters.confirmed) activeFilters.confirmed = 'true';
 
+      activeFilters.page = currentPage;
+      activeFilters.limit = pageSize;
+
       const response = await qsosAPI.getAll(activeFilters);
       qsos = response.qsos;
+      pagination = response.pagination;
     } catch (err) {
       error = err.message;
     } finally {
@@ -163,10 +172,12 @@
   let syncResult = null;
 
   async function applyFilters() {
+    currentPage = 1;
     await loadQSOs();
   }
 
   function clearFilters() {
+    currentPage = 1;
     filters = {
       band: '',
       mode: '',
@@ -175,6 +186,25 @@
     loadQSOs();
   }
 
+  function goToPage(page) {
+    currentPage = page;
+    loadQSOs();
+  }
+
+  function goToPrevious() {
+    if (pagination && pagination.hasPrev) {
+      currentPage--;
+      loadQSOs();
+    }
+  }
+
+  function goToNext() {
+    if (pagination && pagination.hasNext) {
+      currentPage++;
+      loadQSOs();
+    }
+  }
+
   function formatDate(dateStr) {
     if (!dateStr) return '-';
     // ADIF format: YYYYMMDD
@@ -227,7 +257,10 @@
 
 <div class="container">
   <div class="header">
+    <div class="header-left">
+      <a href="/" class="back-button">← Back</a>
       <h1>QSO Log</h1>
+    </div>
     <div class="header-buttons">
       {#if qsos.length > 0}
         <button
@@ -401,8 +434,51 @@
         </tbody>
       </table>
     </div>
+
+    {#if pagination && pagination.totalPages > 1}
+      <div class="pagination">
+        <div class="pagination-info">
+          Showing {pagination.page * pagination.limit - pagination.limit + 1}-{Math.min(pagination.page * pagination.limit, pagination.totalCount)} of {pagination.totalCount}
+        </div>
+        <div class="pagination-controls">
+          <button
+            class="btn btn-secondary btn-small"
+            on:click={goToPrevious}
+            disabled={!pagination.hasPrev || loading}
+          >
+            ← Previous
+          </button>
+
+          <div class="page-numbers">
+            {#each Array(pagination.totalPages) as _, i}
+              {@const page = i + 1}
+              {#if page === 1 || page === pagination.totalPages || (page >= currentPage - 1 && page <= currentPage + 1)}
+                <button
+                  class="btn btn-small {page === currentPage ? 'btn-primary' : 'btn-secondary'}"
+                  on:click={() => goToPage(page)}
+                  disabled={loading}
+                >
+                  {page}
+                </button>
+              {:else if page === currentPage - 2 || page === currentPage + 2}
+                <span class="page-ellipsis">...</span>
+              {/if}
+            {/each}
+          </div>
+
+          <button
+            class="btn btn-secondary btn-small"
+            on:click={goToNext}
+            disabled={!pagination.hasNext || loading}
+          >
+            Next →
+          </button>
+        </div>
+      </div>
+    {:else if qsos.length > 0}
       <p class="showing">Showing {qsos.length} QSOs</p>
     {/if}
+  {/if}
 </div>
 
 <style>
@@ -421,11 +497,32 @@
     gap: 1rem;
   }
 
+  .header-left {
+    display: flex;
+    align-items: center;
+    gap: 1rem;
+  }
+
   .header h1 {
     margin: 0;
     color: #333;
   }
 
+  .back-button {
+    padding: 0.5rem 1rem;
+    background-color: #6c757d;
+    color: white;
+    text-decoration: none;
+    border-radius: 4px;
+    font-size: 0.9rem;
+    font-weight: 500;
+    transition: background-color 0.2s;
+  }
+
+  .back-button:hover {
+    background-color: #5a6268;
+  }
+
   .header-buttons {
     display: flex;
     gap: 1rem;
@@ -669,4 +766,49 @@
     font-size: 0.875rem;
     margin-top: 1rem;
   }
+
+  .pagination {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-top: 1.5rem;
+    padding: 1rem;
+    background: #f8f9fa;
+    border-radius: 8px;
+    flex-wrap: wrap;
+    gap: 1rem;
+  }
+
+  .pagination-info {
+    color: #666;
+    font-size: 0.9rem;
+  }
+
+  .pagination-controls {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+  }
+
+  .page-numbers {
+    display: flex;
+    align-items: center;
+    gap: 0.25rem;
+  }
+
+  .page-ellipsis {
+    padding: 0 0.5rem;
+    color: #666;
+  }
+
+  .btn-small {
+    padding: 0.4rem 0.8rem;
+    font-size: 0.875rem;
+    min-width: 2.5rem;
+  }
+
+  .btn-small:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
 </style>

src/frontend/src/routes/settings/+page.svelte

@@ -76,7 +76,10 @@
 
 <div class="container">
   <div class="header">
+    <div class="header-left">
+      <a href="/" class="back-button">← Back</a>
       <h1>Settings</h1>
+    </div>
     <button class="btn btn-secondary" on:click={handleLogout}>Logout</button>
   </div>
 
@@ -168,6 +171,14 @@
     justify-content: space-between;
     align-items: center;
     margin-bottom: 2rem;
+    flex-wrap: wrap;
+    gap: 1rem;
+  }
+
+  .header-left {
+    display: flex;
+    align-items: center;
+    gap: 1rem;
   }
 
   .header h1 {
@@ -175,6 +186,21 @@
     color: #333;
   }
 
+  .back-button {
+    padding: 0.5rem 1rem;
+    background-color: #6c757d;
+    color: white;
+    text-decoration: none;
+    border-radius: 4px;
+    font-size: 0.9rem;
+    font-weight: 500;
+    transition: background-color 0.2s;
+  }
+
+  .back-button:hover {
+    background-color: #5a6268;
+  }
+
   .user-info {
     background: #f8f9fa;
     padding: 1.5rem;