diff --git a/assets/js/components/DocumentUpload.vue b/assets/js/components/DocumentUpload.vue
index 2f32c22..09bf237 100644
--- a/assets/js/components/DocumentUpload.vue
+++ b/assets/js/components/DocumentUpload.vue
@@ -8,6 +8,7 @@
         icon="pi pi-upload"
         @click="showUploadDialog = true"
         severity="success"
+        class="ml-auto"
         outlined
       />
     </div>
diff --git a/assets/js/components/GitContributionChart.vue b/assets/js/components/GitContributionChart.vue
index a1854e2..4f927d7 100644
--- a/assets/js/components/GitContributionChart.vue
+++ b/assets/js/components/GitContributionChart.vue
@@ -124,10 +124,13 @@ const contributionGrid = computed(() => {
     firstSunday.setDate(firstSunday.getDate() - 1)
   }
   
-  // Create a map of dates to contribution counts
+  // Backend already provides weekday values (0=Sun, 6=Sat), use them directly
   const contributionMap = {}
   contributionData.value.forEach(day => {
-    contributionMap[day.date] = day.count
+    contributionMap[day.date] = {
+      count: day.count,
+      weekday: day.weekday // Use weekday from backend
+    }
   })
   
   let col = 1
@@ -136,12 +139,15 @@ const contributionGrid = computed(() => {
   
   while (currentDate <= lastDay || currentDate.getDay() !== 0) {
     const dateStr = currentDate.toISOString().split('T')[0]
-    const weekday = currentDate.getDay() // 0 = Sunday, 6 = Saturday
+    const contributionInfo = contributionMap[dateStr]
+    
+    // Use weekday from backend if available, otherwise calculate it
+    const weekday = contributionInfo ? contributionInfo.weekday : currentDate.getDay()
     const row = weekday + 1 // Grid row: 1-7 (Sunday-Saturday)
     
     // Only add cells for the current year
     if (currentDate.getFullYear() === currentYear.value) {
-      const count = contributionMap[dateStr] || 0
+      const count = contributionInfo ? contributionInfo.count : 0
       const date = new Date(currentDate)
       
       grid.push({
@@ -301,6 +307,10 @@ async function loadContributions() {
 
     const data = await response.json()
     contributionData.value = data.contributions || []
+    
+    // Debug: Log first few contributions to check weekday values
+    console.log('Loaded contributions sample:', contributionData.value.slice(0, 5))
+    console.log('Total contributions:', contributionData.value.length)
   } catch (err) {
     console.error('Error loading contributions:', err)
     error.value = err.message
@@ -438,7 +448,11 @@ defineExpose({
 }
 
 .intensity-0 {
-  background-color: var(--surface-200);
+  background-color: #ebedf0;
+}
+
+:global(.dark) .intensity-0 {
+  background-color: #161b22;
 }
 
 .intensity-1 {
@@ -457,10 +471,6 @@ defineExpose({
   background-color: #216e39;
 }
 
-:global(.dark) .intensity-0 {
-  background-color: var(--surface-700);
-}
-
 .legend {
   display: flex;
   align-items: center;
diff --git a/assets/js/views/ProjectManagement.vue b/assets/js/views/ProjectManagement.vue
index e386aff..743ed47 100644
--- a/assets/js/views/ProjectManagement.vue
+++ b/assets/js/views/ProjectManagement.vue
@@ -563,13 +563,18 @@
       :modal="true"
       :style="{ width: '1400px' }"
     >
-      <TabView>
-        <!-- Project Data Tab -->
-        <TabPanel header="Projektdaten">
-          <div class="flex flex-col gap-4">
-            <!-- Basic Information -->
-            <div class="p-4 border-round border-1 surface-border">
-              <div class="font-semibold text-lg mb-3">Grunddaten</div>
+      <Tabs value="0">
+        <TabList>
+          <Tab value="0">Projektdaten</Tab>
+          <Tab value="1">Git Repositories</Tab>
+        </TabList>
+        <TabPanels>
+          <!-- Project Data Tab -->
+          <TabPanel value="0">
+            <div class="flex flex-col gap-4">
+              <!-- Basic Information -->
+              <div class="p-4 border-round border-1 surface-border">
+                <div class="font-semibold text-lg mb-3">Grunddaten</div>
               <div class="grid grid-cols-2 gap-4">
                 <div class="flex flex-col gap-2">
                   <label class="font-medium text-sm text-500">Projektname</label>
@@ -677,7 +682,7 @@
         </TabPanel>
 
         <!-- Git Repository Tab -->
-        <TabPanel header="Git Repositories">
+        <TabPanel value="1">
           <div v-if="gitRepositories.length === 0" class="text-center py-8 text-500">
             <i class="pi pi-github text-6xl mb-3"></i>
             <p>Keine Git-Repositories verknüpft</p>
@@ -742,7 +747,8 @@
             </div>
           </div>
         </TabPanel>
-      </TabView>
+      </TabPanels>
+      </Tabs>
 
       <template #footer>
         <Button label="Schließen" @click="viewDialog = false" />
@@ -765,7 +771,10 @@ import DatePicker from 'primevue/datepicker'
 import InputNumber from 'primevue/inputnumber'
 import RadioButton from 'primevue/radiobutton'
 import Tag from 'primevue/tag'
-import TabView from 'primevue/tabview'
+import Tabs from 'primevue/tabs'
+import TabList from 'primevue/tablist'
+import Tab from 'primevue/tab'
+import TabPanels from 'primevue/tabpanels'
 import TabPanel from 'primevue/tabpanel'
 import DataTable from 'primevue/datatable'
 import Column from 'primevue/column'
diff --git a/src/Entity/GitRepository.php b/src/Entity/GitRepository.php
index bb55313..9df61e7 100644
--- a/src/Entity/GitRepository.php
+++ b/src/Entity/GitRepository.php
@@ -8,6 +8,8 @@ use ApiPlatform\Metadata\GetCollection;
 use ApiPlatform\Metadata\Post;
 use ApiPlatform\Metadata\Put;
 use ApiPlatform\Metadata\Delete;
+use ApiPlatform\Doctrine\Orm\Filter\SearchFilter;
+use ApiPlatform\Metadata\ApiFilter;
 use App\Repository\GitRepositoryRepository;
 use Doctrine\DBAL\Types\Types;
 use Doctrine\ORM\Mapping as ORM;
@@ -25,6 +27,7 @@ use Symfony\Component\Serializer\Annotation\Groups;
     normalizationContext: ['groups' => ['git_repo:read']],
     denormalizationContext: ['groups' => ['git_repo:write']]
 )]
+#[ApiFilter(SearchFilter::class, properties: ['project' => 'exact'])]
 class GitRepository
 {
     #[ORM\Id]
diff --git a/src/Service/GitHubService.php b/src/Service/GitHubService.php
index 4b32baf..9d46fdd 100644
--- a/src/Service/GitHubService.php
+++ b/src/Service/GitHubService.php
@@ -100,10 +100,14 @@ class GitHubService
                     $dayKey = $date->format('Y-m-d');
                     
                     if (!isset($dailyContributions[$dayKey])) {
+                        // Convert PHP weekday (1=Mon, 7=Sun) to JS weekday (0=Sun, 6=Sat)
+                        $phpWeekday = (int)$date->format('N'); // 1-7
+                        $jsWeekday = $phpWeekday % 7; // 0=Sun, 1=Mon, ..., 6=Sat
+                        
                         $dailyContributions[$dayKey] = [
                             'date' => $dayKey,
                             'count' => 0,
-                            'weekday' => (int)$date->format('N')
+                            'weekday' => $jsWeekday
                         ];
                     }
                     
@@ -119,10 +123,14 @@ class GitHubService
                 $dayKey = $date->format('Y-m-d');
                 
                 if (!isset($dailyContributions[$dayKey])) {
+                    // Convert PHP weekday (1=Mon, 7=Sun) to JS weekday (0=Sun, 6=Sat)
+                    $phpWeekday = (int)$date->format('N'); // 1-7
+                    $jsWeekday = $phpWeekday % 7; // 0=Sun, 1=Mon, ..., 6=Sat
+                    
                     $dailyContributions[$dayKey] = [
                         'date' => $dayKey,
                         'count' => 0,
-                        'weekday' => (int)$date->format('N')
+                        'weekday' => $jsWeekday
                     ];
                 }
             }
diff --git a/src/Service/GitService.php b/src/Service/GitService.php
index 7438ea6..77babf1 100644
--- a/src/Service/GitService.php
+++ b/src/Service/GitService.php
@@ -119,10 +119,14 @@ class GitService
             $dayKey = $date->format('Y-m-d');
             
             if (!isset($dailyContributions[$dayKey])) {
+                // Convert PHP weekday (1=Mon, 7=Sun) to JS weekday (0=Sun, 6=Sat)
+                $phpWeekday = (int)$date->format('N'); // 1-7
+                $jsWeekday = $phpWeekday % 7; // 0=Sun, 1=Mon, ..., 6=Sat
+                
                 $dailyContributions[$dayKey] = [
                     'date' => $dayKey,
                     'count' => 0,
-                    'weekday' => (int)$date->format('N') // 1 = Monday, 7 = Sunday
+                    'weekday' => $jsWeekday
                 ];
             }
             
@@ -137,10 +141,14 @@ class GitService
             $dayKey = $date->format('Y-m-d');
             
             if (!isset($dailyContributions[$dayKey])) {
+                // Convert PHP weekday (1=Mon, 7=Sun) to JS weekday (0=Sun, 6=Sat)
+                $phpWeekday = (int)$date->format('N'); // 1-7
+                $jsWeekday = $phpWeekday % 7; // 0=Sun, 1=Mon, ..., 6=Sat
+                
                 $dailyContributions[$dayKey] = [
                     'date' => $dayKey,
                     'count' => 0,
-                    'weekday' => (int)$date->format('N')
+                    'weekday' => $jsWeekday
                 ];
             }
         }
diff --git a/src/Service/GiteaService.php b/src/Service/GiteaService.php
index 2eafff5..1815c71 100644
--- a/src/Service/GiteaService.php
+++ b/src/Service/GiteaService.php
@@ -101,10 +101,14 @@ class GiteaService
                 $dayKey = $date->format('Y-m-d');
                 
                 if (!isset($dailyContributions[$dayKey])) {
+                    // Convert PHP weekday (1=Mon, 7=Sun) to JS weekday (0=Sun, 6=Sat)
+                    $phpWeekday = (int)$date->format('N'); // 1-7
+                    $jsWeekday = $phpWeekday % 7; // 0=Sun, 1=Mon, ..., 6=Sat
+                    
                     $dailyContributions[$dayKey] = [
                         'date' => $dayKey,
                         'count' => 0,
-                        'weekday' => (int)$date->format('N')
+                        'weekday' => $jsWeekday
                     ];
                 }
                 
@@ -116,10 +120,14 @@ class GiteaService
                 $dayKey = $date->format('Y-m-d');
                 
                 if (!isset($dailyContributions[$dayKey])) {
+                    // Convert PHP weekday (1=Mon, 7=Sun) to JS weekday (0=Sun, 6=Sat)
+                    $phpWeekday = (int)$date->format('N'); // 1-7
+                    $jsWeekday = $phpWeekday % 7; // 0=Sun, 1=Mon, ..., 6=Sat
+                    
                     $dailyContributions[$dayKey] = [
                         'date' => $dayKey,
                         'count' => 0,
-                        'weekday' => (int)$date->format('N')
+                        'weekday' => $jsWeekday
                     ];
                 }
             }