feat: Implement project ownership and team member management with access control

- Added owner and team members relationships to the Project entity.
- Updated ProjectRepository to find projects based on user ownership or team membership.
- Enhanced ProjectVoter to manage view, edit, and delete permissions based on ownership and team membership.
- Created ProjectAccessExtension to filter projects based on user access.
- Updated ProjectManagement.vue to include owner and team member selection in the UI.
- Implemented API endpoints for managing Git repositories with proper access control.
- Added migration to update the database schema for project ownership and team members.

assets/js/views/ProjectManagement.vue

@@ -278,6 +278,58 @@
           </div>
         </div>
 
+        <!-- Team & Access Management -->
+        <div class="font-semibold text-lg mt-4">Team & Zugriff</div>
+        <div class="grid grid-cols-2 gap-4">
+          <div class="flex flex-col gap-2">
+            <label for="owner">Eigentümer *</label>
+            <Select
+              id="owner"
+              v-model="editingProject.owner"
+              :options="users"
+              option-label="email"
+              placeholder="Eigentümer auswählen"
+              filter
+              :disabled="saving"
+              :class="{ 'p-invalid': submitted && !editingProject.owner }"
+            >
+              <template #option="slotProps">
+                <div class="flex flex-col">
+                  <span class="font-medium">{{ slotProps.option.email }}</span>
+                  <span v-if="slotProps.option.firstName || slotProps.option.lastName" class="text-sm text-500">
+                    {{ slotProps.option.firstName }} {{ slotProps.option.lastName }}
+                  </span>
+                </div>
+              </template>
+            </Select>
+            <small v-if="submitted && !editingProject.owner" class="p-error">Eigentümer ist erforderlich</small>
+          </div>
+
+          <div class="flex flex-col gap-2">
+            <label for="teamMembers">Team-Mitglieder</label>
+            <Select
+              id="teamMembers"
+              v-model="editingProject.teamMembers"
+              :options="users"
+              option-label="email"
+              placeholder="Team-Mitglieder auswählen"
+              filter
+              multiple
+              :disabled="saving"
+            >
+              <template #option="slotProps">
+                <div class="flex flex-col">
+                  <span class="font-medium">{{ slotProps.option.email }}</span>
+                  <span v-if="slotProps.option.firstName || slotProps.option.lastName" class="text-sm text-500">
+                    {{ slotProps.option.firstName }} {{ slotProps.option.lastName }}
+                  </span>
+                </div>
+              </template>
+            </Select>
+            <small class="text-500">Team-Mitglieder können das Projekt ansehen und bearbeiten</small>
+          </div>
+        </div>
+
         <!-- Documents Section (only for existing projects) -->
         <div v-if="editingProject.id" class="mt-4">
           <div class="font-semibold text-lg mb-3">Dokumente</div>
@@ -796,6 +848,8 @@ const deleting = ref(false)
 const typeFilter = ref('all')
 const customers = ref([])
 const statuses = ref([])
+const users = ref([])
+const currentUser = ref(null)
 const gitRepositories = ref([])
 const selectedRepository = ref(null)
 const selectedBranch = ref('main')
@@ -844,7 +898,7 @@ const projectColumns = ref([
 ])
 
 onMounted(async () => {
-  await Promise.all([loadCustomers(), loadStatuses()])
+  await Promise.all([loadCustomers(), loadStatuses(), loadUsers(), loadCurrentUser()])
 })
 
 async function loadCustomers() {
@@ -891,6 +945,39 @@ async function loadStatuses() {
   }
 }
 
+async function loadUsers() {
+  try {
+    const response = await fetch('/api/users?pagination=false')
+    if (!response.ok) throw new Error('Fehler beim Laden der Benutzer')
+    
+    const data = await response.json()
+    const usersList = data['hydra:member'] || data.member || data
+    
+    users.value = Array.isArray(usersList) ? usersList : []
+  } catch (error) {
+    console.error('Error loading users:', error)
+    users.value = []
+    toast.add({
+      severity: 'error',
+      summary: 'Fehler',
+      detail: 'Benutzer konnten nicht geladen werden',
+      life: 3000
+    })
+  }
+}
+
+async function loadCurrentUser() {
+  try {
+    const response = await fetch('/api/me')
+    if (!response.ok) throw new Error('Fehler beim Laden des aktuellen Benutzers')
+    
+    currentUser.value = await response.json()
+  } catch (error) {
+    console.error('Error loading current user:', error)
+    currentUser.value = null
+  }
+}
+
 function filterByType(type, loadData) {
   typeFilter.value = type
   
@@ -960,7 +1047,9 @@ function openNewProjectDialog() {
     endDate: null,
     budget: null,
     hourContingent: null,
-    isPrivate: false
+    isPrivate: false,
+    owner: currentUser.value,
+    teamMembers: []
   }
   submitted.value = false
   projectDialog.value = true
@@ -974,7 +1063,8 @@ function editProject(project) {
     startDate: project.startDate ? new Date(project.startDate) : null,
     endDate: project.endDate ? new Date(project.endDate) : null,
     budget: project.budget ? parseFloat(project.budget) : null,
-    hourContingent: project.hourContingent ? parseFloat(project.hourContingent) : null
+    hourContingent: project.hourContingent ? parseFloat(project.hourContingent) : null,
+    teamMembers: project.teamMembers || []
   }
   submitted.value = false
   projectDialog.value = true
@@ -1218,7 +1308,7 @@ async function deleteGitRepo() {
 async function saveProject() {
   submitted.value = true
   
-  if (!editingProject.value.name) {
+  if (!editingProject.value.name || !editingProject.value.owner) {
     return
   }
   
@@ -1238,7 +1328,9 @@ async function saveProject() {
       endDate: editingProject.value.endDate ? formatDateForAPI(editingProject.value.endDate) : null,
       budget: editingProject.value.budget ? editingProject.value.budget.toString() : null,
       hourContingent: editingProject.value.hourContingent ? editingProject.value.hourContingent.toString() : null,
-      isPrivate: editingProject.value.isPrivate
+      isPrivate: editingProject.value.isPrivate,
+      owner: `/api/users/${editingProject.value.owner.id}`,
+      teamMembers: editingProject.value.teamMembers?.map(member => `/api/users/${member.id}`) || []
     }
     
     const isNew = !editingProject.value.id

bruno/Git Integration/Create Repository.bru

@@ -0,0 +1,65 @@
+meta {
+  name: Create Repository
+  type: http
+  seq: 7
+}
+
+post {
+  url: {{baseUrl}}/api/git_repositories
+  body: json
+  auth: none
+}
+
+headers {
+  Accept: application/json
+  Content-Type: application/json
+  Cookie: {{sessionCookie}}
+}
+
+body:json {
+  {
+    "name": "My Project Repository",
+    "provider": "github",
+    "owner": "username",
+    "repo": "repository-name",
+    "branch": "main",
+    "project": "/api/projects/1",
+    "personalAccessToken": "ghp_xxxxxxxxxxxx"
+  }
+}
+
+docs {
+  # Create Repository
+  
+  Creates a new Git repository entry.
+  
+  ## Body Parameters
+  - `name`: Display name for the repository
+  - `provider`: One of 'github', 'gitea', 'local'
+  - `owner`: Repository owner/organization
+  - `repo`: Repository name
+  - `branch`: Default branch (usually 'main' or 'master')
+  - `project`: IRI reference to project (e.g., "/api/projects/1")
+  - `personalAccessToken`: Optional access token for private repos
+  
+  ## Provider-Specific Settings
+  
+  ### GitHub
+  - `owner`: GitHub username or organization
+  - `repo`: Repository name
+  - `personalAccessToken`: GitHub Personal Access Token (optional for public repos)
+  
+  ### Gitea
+  - `owner`: Gitea username or organization
+  - `repo`: Repository name
+  - `personalAccessToken`: Gitea API token
+  - Requires `giteaUrl` in environment
+  
+  ### Local
+  - `localPath`: Absolute path to local Git repository
+  - No owner/repo needed
+  
+  ## Security
+  - Requires authentication
+  - Token is stored encrypted in database
+}

bruno/Git Integration/Delete Repository.bru

@@ -0,0 +1,32 @@
+meta {
+  name: Delete Repository
+  type: http
+  seq: 9
+}
+
+delete {
+  url: {{baseUrl}}/api/git_repositories/1
+  body: none
+  auth: none
+}
+
+headers {
+  Accept: application/json
+  Cookie: {{sessionCookie}}
+}
+
+docs {
+  # Delete Repository
+  
+  Deletes a Git repository entry.
+  
+  ## Security
+  - Requires authentication via session cookie
+  - Voter checks DELETE permission
+  - Only accessible if repository belongs to user's project
+  
+  ## Important
+  - This only deletes the database entry
+  - The actual Git repository remains untouched
+  - Cache for this repository is automatically cleared
+}

bruno/Git Integration/Get Commits.bru

@@ -0,0 +1,52 @@
+meta {
+  name: Get Commits
+  type: http
+  seq: 4
+}
+
+get {
+  url: {{baseUrl}}/api/git-repos/1/commits?branch=main&limit=50
+  body: none
+  auth: none
+}
+
+params:query {
+  branch: main
+  limit: 50
+}
+
+headers {
+  Accept: application/json
+  Cookie: {{sessionCookie}}
+}
+
+docs {
+  # Get Commits
+  
+  Fetches commit history for a specific repository and branch.
+  
+  ## Query Parameters
+  - `branch`: Git branch name (default: 'main')
+  - `limit`: Number of commits to fetch (default: 100)
+  
+  ## Response
+  ```json
+  {
+    "commits": [
+      {
+        "hash": "abc123def456...",
+        "shortHash": "abc123d",
+        "subject": "Add new feature",
+        "body": "Detailed commit message...",
+        "author": "John Doe",
+        "email": "john@example.com",
+        "date": "2025-11-14T10:30:00+00:00"
+      }
+    ]
+  }
+  ```
+  
+  ## Caching
+  - Cached for 15 minutes (900 seconds)
+  - Cache key includes repository ID, branch, and limit
+}

bruno/Git Integration/Get Contributions.bru

@@ -0,0 +1,62 @@
+meta {
+  name: Get Contributions
+  type: http
+  seq: 5
+}
+
+get {
+  url: {{baseUrl}}/api/git-repos/1/contributions?branch=main&year=2025
+  body: none
+  auth: none
+}
+
+params:query {
+  branch: main
+  year: 2025
+  ~author: john@example.com
+}
+
+headers {
+  Accept: application/json
+  Cookie: {{sessionCookie}}
+}
+
+docs {
+  # Get Contributions
+  
+  Fetches daily contribution data for a specific repository, branch, and year.
+  Used for generating GitHub-style contribution heatmaps.
+  
+  ## Query Parameters
+  - `branch`: Git branch name (default: 'main')
+  - `year`: Year for contributions (default: current year)
+  - `author`: Optional email filter for specific author
+  
+  ## Response
+  ```json
+  {
+    "contributions": [
+      {
+        "date": "2025-01-01",
+        "count": 3,
+        "weekday": 3
+      },
+      {
+        "date": "2025-01-02",
+        "count": 0,
+        "weekday": 4
+      }
+    ]
+  }
+  ```
+  
+  ## Weekday Format
+  - 0 = Sunday
+  - 1 = Monday
+  - ...
+  - 6 = Saturday
+  
+  ## Caching
+  - Cached for 1 hour (3600 seconds)
+  - Cache key includes repository ID, branch, author, and year
+}

bruno/Git Integration/Get Git Repositories.bru

@@ -0,0 +1,34 @@
+meta {
+  name: Get Git Repositories
+  type: http
+  seq: 1
+}
+
+get {
+  url: {{baseUrl}}/api/git_repositories?project=4
+  body: none
+  auth: none
+}
+
+params:query {
+  project: 4
+}
+
+headers {
+  Accept: application/json
+  Cookie: {{sessionCookie}}
+}
+
+docs {
+  # Get Git Repositories
+  
+  Fetches all Git repositories associated with a specific project.
+  
+  ## Query Parameters
+  - `project`: Project ID (required for security filtering)
+  
+  ## Security
+  - Requires authentication via session cookie
+  - SearchFilter ensures only repositories for the specified project are returned
+  - Voter checks are applied on individual items
+}

bruno/Git Integration/Get Single Repository.bru

@@ -0,0 +1,27 @@
+meta {
+  name: Get Single Repository
+  type: http
+  seq: 2
+}
+
+get {
+  url: {{baseUrl}}/api/git_repositories/1
+  body: none
+  auth: none
+}
+
+headers {
+  Accept: application/json
+  Cookie: {{sessionCookie}}
+}
+
+docs {
+  # Get Single Repository
+  
+  Fetches a specific Git repository by ID.
+  
+  ## Security
+  - Requires authentication via session cookie
+  - Voter checks VIEW permission
+  - Only accessible if repository belongs to user's project
+}

bruno/Git Integration/Refresh Cache.bru

@@ -0,0 +1,36 @@
+meta {
+  name: Refresh Cache
+  type: http
+  seq: 6
+}
+
+post {
+  url: {{baseUrl}}/api/git-repos/1/refresh-cache
+  body: none
+  auth: none
+}
+
+headers {
+  Accept: application/json
+  Cookie: {{sessionCookie}}
+}
+
+docs {
+  # Refresh Cache
+  
+  Manually clears the cache for a specific repository.
+  Forces fresh data on next request for commits and contributions.
+  
+  ## Response
+  ```json
+  {
+    "success": true,
+    "message": "Cache cleared successfully"
+  }
+  ```
+  
+  ## Use Cases
+  - After pushing new commits
+  - When data appears outdated
+  - Testing/development
+}

bruno/Git Integration/Test Repository Connection.bru

@@ -0,0 +1,44 @@
+meta {
+  name: Test Repository Connection
+  type: http
+  seq: 3
+}
+
+post {
+  url: {{baseUrl}}/api/git-repos/1/test
+  body: none
+  auth: none
+}
+
+headers {
+  Accept: application/json
+  Cookie: {{sessionCookie}}
+}
+
+docs {
+  # Test Repository Connection
+  
+  Tests if the repository connection is working correctly by fetching the first 10 commits.
+  
+  ## Response
+  ```json
+  {
+    "success": true,
+    "message": "Repository connection successful!",
+    "details": {
+      "commits": 10,
+      "firstCommit": "abc123d: Add new feature",
+      "provider": "github|gitea|local"
+    }
+  }
+  ```
+  
+  ## Error Response
+  ```json
+  {
+    "success": false,
+    "error": "Connection failed: ...",
+    "hint": "Check owner/repo/branch settings"
+  }
+  ```
+}

bruno/Git Integration/Update Repository.bru

@@ -0,0 +1,38 @@
+meta {
+  name: Update Repository
+  type: http
+  seq: 8
+}
+
+put {
+  url: {{baseUrl}}/api/git_repositories/1
+  body: json
+  auth: none
+}
+
+headers {
+  Accept: application/json
+  Content-Type: application/json
+  Cookie: {{sessionCookie}}
+}
+
+body:json {
+  {
+    "name": "Updated Repository Name",
+    "branch": "develop"
+  }
+}
+
+docs {
+  # Update Repository
+  
+  Updates an existing Git repository entry.
+  
+  ## Security
+  - Requires authentication via session cookie
+  - Voter checks EDIT permission
+  - Only accessible if repository belongs to user's project
+  
+  ## Partial Updates
+  You can send only the fields you want to update.
+}

bruno/README.md

@@ -0,0 +1,148 @@
+# myCRM Bruno API Collection
+
+Diese Bruno-Collection enthält alle API-Endpunkte für die myCRM-Anwendung.
+
+## Setup
+
+1. **Bruno installieren**
+   ```bash
+   # Via npm
+   npm install -g @usebruno/cli
+   
+   # Oder Desktop-App von https://www.usebruno.com/ herunterladen
+   ```
+
+2. **Collection öffnen**
+   - Bruno Desktop-App öffnen
+   - "Open Collection" wählen
+   - Diesen `bruno/` Ordner auswählen
+
+3. **Environment konfigurieren**
+   - In Bruno: Environment "local" auswählen
+   - Session-Cookie holen:
+     ```bash
+     # Option 1: Aus Browser DevTools kopieren
+     # 1. In Browser bei localhost:8000 einloggen
+     # 2. DevTools → Application → Cookies
+     # 3. PHPSESSID kopieren
+     
+     # Option 2: Via Symfony CLI
+     symfony server:log
+     # Nach Login den Cookie aus den Logs kopieren
+     ```
+   - In `environments/local.bru` den `sessionCookie` Wert eintragen
+
+## Verfügbare Sammlungen
+
+### Git Integration
+Alle Endpunkte für die Git-Repository-Integration:
+
+- **Get Git Repositories** - Liste aller Repositories eines Projekts
+- **Get Single Repository** - Details eines einzelnen Repositories
+- **Test Repository Connection** - Verbindung testen (10 Commits)
+- **Get Commits** - Commit-Historie abrufen
+- **Get Contributions** - Tägliche Contributions für Heatmap
+- **Refresh Cache** - Cache manuell leeren
+- **Create Repository** - Neues Repository anlegen
+- **Update Repository** - Repository aktualisieren
+- **Delete Repository** - Repository löschen
+
+## Authentifizierung
+
+Die API verwendet Session-basierte Authentifizierung:
+
+```
+Cookie: PHPSESSID=your_session_id_here
+```
+
+Die Session wird automatisch von allen Requests verwendet, wenn sie im Environment konfiguriert ist.
+
+## Sicherheit
+
+Alle Endpunkte sind durch Symfony Security und Voter geschützt:
+
+- **Authentication**: Session-Cookie erforderlich
+- **Authorization**: GitRepositoryVoter prüft VIEW/EDIT/DELETE Rechte
+- **Project-Filtering**: Nur Repositories des eigenen Projekts sind sichtbar
+
+## Caching
+
+Die Git-Integration verwendet Symfony Cache:
+
+- **Commits**: 15 Minuten (900s)
+- **Contributions**: 1 Stunde (3600s)
+- **Manuelles Löschen**: POST `/api/git-repos/{id}/refresh-cache`
+
+## Provider-Typen
+
+### GitHub
+```json
+{
+  "provider": "github",
+  "owner": "username",
+  "repo": "repository",
+  "personalAccessToken": "ghp_xxxxx"
+}
+```
+
+### Gitea
+```json
+{
+  "provider": "gitea",
+  "owner": "username",
+  "repo": "repository",
+  "personalAccessToken": "gitea_token",
+  "giteaUrl": "https://gitea.example.com"
+}
+```
+
+### Local
+```json
+{
+  "provider": "local",
+  "localPath": "/absolute/path/to/repo"
+}
+```
+
+## Testing
+
+1. **Repository-Verbindung testen**:
+   ```
+   POST /api/git-repos/{id}/test
+   ```
+
+2. **Commits abrufen**:
+   ```
+   GET /api/git-repos/{id}/commits?branch=main&limit=50
+   ```
+
+3. **Contributions für Heatmap**:
+   ```
+   GET /api/git-repos/{id}/contributions?branch=main&year=2025
+   ```
+
+## Troubleshooting
+
+### 401 Unauthorized
+- Session-Cookie abgelaufen → Neu einloggen und Cookie aktualisieren
+- Cookie falsch formatiert → Format: `PHPSESSID=value`
+
+### 403 Forbidden
+- Voter verweigert Zugriff → Repository gehört nicht zum eigenen Projekt
+- Fehlende Berechtigungen → Projekt-Zugriff prüfen
+
+### 404 Not Found
+- Repository existiert nicht
+- Falsche ID verwendet
+- Repository wurde gelöscht
+
+### 500 Internal Server Error
+- Git-Fehler → Repository-Einstellungen prüfen (owner/repo/branch)
+- Token ungültig → Personal Access Token erneuern
+- Cache-Fehler → `var/cache/` Ordner prüfen
+
+## Weitere Informationen
+
+- [Symfony API Platform Docs](https://api-platform.com/)
+- [Bruno Documentation](https://docs.usebruno.com/)
+- [Git Integration Docs](../docs/GIT_INTEGRATION.md)

bruno/bruno.json

@@ -0,0 +1,9 @@
+{
+  "version": "1",
+  "name": "myCRM API",
+  "type": "collection",
+  "ignore": [
+    "node_modules",
+    ".git"
+  ]
+}

bruno/environments/local.bru

@@ -0,0 +1,6 @@
+vars {
+  baseUrl: http://localhost:8000
+  # Get this from your browser's developer tools after login
+  # Or use symfony CLI to get session cookie
+  sessionCookie: PHPSESSID=f5kmgf6khpmo106vkikupmpuc5
+}

bruno/environments/myCRM.bru

@@ -0,0 +1,4 @@
+vars {
+  baseUrl: https://mycrm.test
+  PHPSESSID: f5kmgf6khpmo106vkikupmpuc5
+}

migrations/Version20251114102103.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Add owner and team members to projects
+ */
+final class Version20251114102103 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add owner (ManyToOne) and team_members (ManyToMany) relationships to projects table';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // Check if owner_id already exists
+        $this->addSql('SET @col_exists = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = "projects" AND COLUMN_NAME = "owner_id")');
+        $this->addSql('SET @sql = IF(@col_exists = 0, "ALTER TABLE projects ADD owner_id INT DEFAULT NULL", "SELECT 1")');
+        $this->addSql('PREPARE stmt FROM @sql');
+        $this->addSql('EXECUTE stmt');
+        $this->addSql('DEALLOCATE PREPARE stmt');
+        
+        // Set first user as owner for existing projects
+        $this->addSql('UPDATE projects SET owner_id = (SELECT id FROM users ORDER BY id LIMIT 1) WHERE owner_id IS NULL');
+        
+        // Make owner_id NOT NULL
+        $this->addSql('SET @sql = IF(@col_exists = 0, "ALTER TABLE projects MODIFY owner_id INT NOT NULL", "SELECT 1")');
+        $this->addSql('PREPARE stmt FROM @sql');
+        $this->addSql('EXECUTE stmt');
+        $this->addSql('DEALLOCATE PREPARE stmt');
+        
+        // Add foreign key if not exists
+        $this->addSql('SET @fk_exists = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = "projects" AND CONSTRAINT_NAME = "FK_5C93B3A47E3C61F9")');
+        $this->addSql('SET @sql = IF(@fk_exists = 0, "ALTER TABLE projects ADD CONSTRAINT FK_5C93B3A47E3C61F9 FOREIGN KEY (owner_id) REFERENCES users (id) ON DELETE CASCADE", "SELECT 1")');
+        $this->addSql('PREPARE stmt FROM @sql');
+        $this->addSql('EXECUTE stmt');
+        $this->addSql('DEALLOCATE PREPARE stmt');
+        
+        // Add index if not exists
+        $this->addSql('SET @idx_exists = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = "projects" AND INDEX_NAME = "IDX_5C93B3A47E3C61F9")');
+        $this->addSql('SET @sql = IF(@idx_exists = 0, "CREATE INDEX IDX_5C93B3A47E3C61F9 ON projects (owner_id)", "SELECT 1")');
+        $this->addSql('PREPARE stmt FROM @sql');
+        $this->addSql('EXECUTE stmt');
+        $this->addSql('DEALLOCATE PREPARE stmt');
+
+        // Create junction table for team members if not exists
+        $this->addSql('CREATE TABLE IF NOT EXISTS project_team_members (project_id INT NOT NULL, user_id INT NOT NULL, INDEX IDX_8A3C5F7D166D1F9C (project_id), INDEX IDX_8A3C5F7DA76ED395 (user_id), PRIMARY KEY(project_id, user_id)) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB');
+        
+        // Add foreign keys for junction table if not exists
+        $this->addSql('SET @fk1_exists = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = "project_team_members" AND CONSTRAINT_NAME = "FK_8A3C5F7D166D1F9C")');
+        $this->addSql('SET @sql = IF(@fk1_exists = 0, "ALTER TABLE project_team_members ADD CONSTRAINT FK_8A3C5F7D166D1F9C FOREIGN KEY (project_id) REFERENCES projects (id) ON DELETE CASCADE", "SELECT 1")');
+        $this->addSql('PREPARE stmt FROM @sql');
+        $this->addSql('EXECUTE stmt');
+        $this->addSql('DEALLOCATE PREPARE stmt');
+        
+        $this->addSql('SET @fk2_exists = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = "project_team_members" AND CONSTRAINT_NAME = "FK_8A3C5F7DA76ED395")');
+        $this->addSql('SET @sql = IF(@fk2_exists = 0, "ALTER TABLE project_team_members ADD CONSTRAINT FK_8A3C5F7DA76ED395 FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE", "SELECT 1")');
+        $this->addSql('PREPARE stmt FROM @sql');
+        $this->addSql('EXECUTE stmt');
+        $this->addSql('DEALLOCATE PREPARE stmt');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // Drop junction table
+        $this->addSql('ALTER TABLE project_team_members DROP FOREIGN KEY FK_8A3C5F7D166D1F9C');
+        $this->addSql('ALTER TABLE project_team_members DROP FOREIGN KEY FK_8A3C5F7DA76ED395');
+        $this->addSql('DROP TABLE project_team_members');
+
+        // Remove owner_id from projects
+        $this->addSql('ALTER TABLE projects DROP FOREIGN KEY FK_5C93B3A47E3C61F9');
+        $this->addSql('DROP INDEX IDX_5C93B3A47E3C61F9 ON projects');
+        $this->addSql('ALTER TABLE projects DROP owner_id');
+    }
+}

src/Doctrine/Extension/ProjectAccessExtension.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Doctrine\Extension;
+
+use ApiPlatform\Doctrine\Orm\Extension\QueryCollectionExtensionInterface;
+use ApiPlatform\Doctrine\Orm\Util\QueryNameGeneratorInterface;
+use ApiPlatform\Metadata\Operation;
+use App\Entity\Project;
+use App\Entity\User;
+use Doctrine\ORM\QueryBuilder;
+use Symfony\Bundle\SecurityBundle\Security;
+
+final class ProjectAccessExtension implements QueryCollectionExtensionInterface
+{
+    public function __construct(
+        private Security $security
+    ) {
+    }
+
+    public function applyToCollection(
+        QueryBuilder $queryBuilder,
+        QueryNameGeneratorInterface $queryNameGenerator,
+        string $resourceClass,
+        ?Operation $operation = null,
+        array $context = []
+    ): void {
+        if (Project::class !== $resourceClass) {
+            return;
+        }
+
+        $user = $this->security->getUser();
+        if (!$user instanceof User) {
+            return;
+        }
+
+        $rootAlias = $queryBuilder->getRootAliases()[0];
+        $teamMemberAlias = $queryNameGenerator->generateJoinAlias('teamMembers');
+
+        $queryBuilder
+            ->leftJoin(sprintf('%s.teamMembers', $rootAlias), $teamMemberAlias)
+            ->andWhere(sprintf('%s.owner = :current_user OR %s = :current_user', $rootAlias, $teamMemberAlias))
+            ->setParameter('current_user', $user);
+    }
+}

src/Entity/Project.php

@@ -132,10 +132,22 @@ class Project implements ModuleAwareInterface
     #[Groups(['project:read'])]
     private Collection $gitRepositories;
 
+    #[ORM\ManyToOne(targetEntity: User::class)]
+    #[ORM\JoinColumn(nullable: false, onDelete: 'CASCADE')]
+    #[Groups(['project:read', 'project:write'])]
+    #[Assert\NotNull(message: 'Ein Projekt muss einen Eigentümer haben')]
+    private ?User $owner = null;
+
+    #[ORM\ManyToMany(targetEntity: User::class)]
+    #[ORM\JoinTable(name: 'project_team_members')]
+    #[Groups(['project:read', 'project:write'])]
+    private Collection $teamMembers;
+
     public function __construct()
     {
         $this->createdAt = new \DateTimeImmutable();
         $this->gitRepositories = new ArrayCollection();
+        $this->teamMembers = new ArrayCollection();
     }
 
     public function getId(): ?int
@@ -344,6 +356,52 @@ class Project implements ModuleAwareInterface
         return $this;
     }
 
+    public function getOwner(): ?User
+    {
+        return $this->owner;
+    }
+
+    public function setOwner(?User $owner): static
+    {
+        $this->owner = $owner;
+        $this->updatedAt = new \DateTimeImmutable();
+        return $this;
+    }
+
+    /**
+     * @return Collection<int, User>
+     */
+    public function getTeamMembers(): Collection
+    {
+        return $this->teamMembers;
+    }
+
+    public function addTeamMember(User $teamMember): static
+    {
+        if (!$this->teamMembers->contains($teamMember)) {
+            $this->teamMembers->add($teamMember);
+        }
+
+        return $this;
+    }
+
+    public function removeTeamMember(User $teamMember): static
+    {
+        $this->teamMembers->removeElement($teamMember);
+
+        return $this;
+    }
+
+    public function isTeamMember(User $user): bool
+    {
+        return $this->teamMembers->contains($user);
+    }
+
+    public function hasAccess(User $user): bool
+    {
+        return $this->owner === $user || $this->isTeamMember($user);
+    }
+
     /**
      * Returns the module code this entity belongs to.
      * Required by ModuleVoter for permission checks.

src/Repository/ProjectRepository.php

@@ -54,4 +54,19 @@ class ProjectRepository extends ServiceEntityRepository
             ->getQuery()
             ->getResult();
     }
+
+    /**
+     * Find all projects where user is owner or team member
+     */
+    public function findUserProjects(\App\Entity\User $user): array
+    {
+        return $this->createQueryBuilder('p')
+            ->leftJoin('p.teamMembers', 'tm')
+            ->where('p.owner = :user')
+            ->orWhere('tm = :user')
+            ->setParameter('user', $user)
+            ->orderBy('p.startDate', 'DESC')
+            ->getQuery()
+            ->getResult();
+    }
 }

src/Security/Voter/GitRepositoryVoter.php

@@ -57,14 +57,8 @@ class GitRepositoryVoter extends Voter
             return false;
         }
         
-        // TODO: Implement proper project-level permissions when Project has user relationships
+        // Allow access if user is owner or team member
-        // For now, allow all authenticated users to view repositories in existing projects
+        return $project->hasAccess($user);
-        // This is safe because:
-        // 1. SearchFilter on 'project' ensures users can only query their accessible projects
-        // 2. Direct item access requires knowing the project exists
-        // 3. Future ProjectVoter will add fine-grained control
-        
-        return true;
     }
 
     private function canEdit(GitRepository $gitRepository, User $user): bool
@@ -76,11 +70,8 @@ class GitRepositoryVoter extends Voter
             return false;
         }
         
-        // TODO: Implement role-based permissions when Project entity has user relationships
+        // Allow edit if user is owner or team member
-        // For now, allow all authenticated users to edit repositories
+        return $project->hasAccess($user);
-        // This maintains current behavior while adding structure for future restrictions
-        
-        return true;
     }
 
     private function canDelete(GitRepository $gitRepository, User $user): bool
@@ -92,10 +83,7 @@ class GitRepositoryVoter extends Voter
             return false;
         }
         
-        // TODO: Restrict to project owners when Project entity has owner relationship
+        // Only project owner can delete repositories
-        // For now, allow all authenticated users to delete repositories
+        return $project->getOwner() === $user;
-        // This maintains current behavior while adding structure for future restrictions
-        
-        return true;
     }
 }

src/Security/Voter/ProjectVoter.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace App\Security\Voter;
+
+use App\Entity\Project;
+use App\Entity\User;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Authorization\Voter\Voter;
+
+class ProjectVoter extends Voter
+{
+    public const VIEW = 'VIEW';
+    public const EDIT = 'EDIT';
+    public const DELETE = 'DELETE';
+    public const CREATE = 'CREATE';
+
+    protected function supports(string $attribute, mixed $subject): bool
+    {
+        // Support CREATE on class name string
+        if ($attribute === self::CREATE && $subject === 'projects') {
+            return true;
+        }
+
+        // Support VIEW/EDIT/DELETE on Project instances
+        if (!in_array($attribute, [self::VIEW, self::EDIT, self::DELETE])) {
+            return false;
+        }
+
+        return $subject instanceof Project;
+    }
+
+    protected function voteOnAttribute(string $attribute, mixed $subject, TokenInterface $token): bool
+    {
+        $user = $token->getUser();
+
+        if (!$user instanceof User) {
+            return false;
+        }
+
+        // CREATE permission - any authenticated user can create projects
+        if ($attribute === self::CREATE) {
+            return true;
+        }
+
+        /** @var Project $project */
+        $project = $subject;
+
+        return match ($attribute) {
+            self::VIEW => $this->canView($project, $user),
+            self::EDIT => $this->canEdit($project, $user),
+            self::DELETE => $this->canDelete($project, $user),
+            default => false,
+        };
+    }
+
+    private function canView(Project $project, User $user): bool
+    {
+        // Owner and team members can view
+        return $project->hasAccess($user);
+    }
+
+    private function canEdit(Project $project, User $user): bool
+    {
+        // Owner and team members can edit
+        return $project->hasAccess($user);
+    }
+
+    private function canDelete(Project $project, User $user): bool
+    {
+        // Only owner can delete
+        return $project->getOwner() === $user;
+    }
+}

src/State/ProjectCollectionProvider.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProviderInterface;
+use App\Entity\Project;
+use App\Entity\User;
+use App\Repository\ProjectRepository;
+use Symfony\Bundle\SecurityBundle\Security;
+
+class ProjectCollectionProvider implements ProviderInterface
+{
+    public function __construct(
+        private ProjectRepository $projectRepository,
+        private Security $security
+    ) {
+    }
+
+    public function provide(Operation $operation, array $uriVariables = [], array $context = []): object|array|null
+    {
+        $user = $this->security->getUser();
+        
+        if (!$user instanceof User) {
+            return [];
+        }
+
+        // Get all projects where user is owner or team member
+        return $this->projectRepository->findUserProjects($user);
+    }
+}