feat: add cursor-based pagination to Facebook posts API

Previously get_page_posts returned a flat list with no pagination support.
Now returns dict with posts and next_cursor, enabling infinite scrolling
through all Facebook page posts via the after query parameter.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

blueprints/admin/routes_social_publisher.py

@@ -388,7 +388,8 @@ def social_publisher_fb_posts(company_id):
     finally:
         db.close()
 
-    result = social_publisher.get_page_recent_posts(company_id)
+    after = request.args.get('after')
+    result = social_publisher.get_page_recent_posts(company_id, after=after)
     return jsonify(result)
 
 

facebook_graph_service.py

@@ -273,22 +273,28 @@ class FacebookGraphService:
             'reactions_total': result.get('reactions', {}).get('summary', {}).get('total_count', 0),
         }
 
-    def get_page_posts(self, page_id: str, limit: int = 10) -> Optional[List[Dict]]:
+    def get_page_posts(self, page_id: str, limit: int = 10,
+                       after: str = None) -> Optional[Dict]:
         """Get recent posts from a Facebook Page with engagement metrics.
 
         Args:
             page_id: Facebook Page ID
             limit: Number of posts to fetch (max 100)
+            after: Pagination cursor for next page
 
         Returns:
-            List of post dicts or None on failure
+            Dict with 'posts' list and 'next_cursor' (or None), or None on failure
         """
         fields = (
             'id,message,created_time,full_picture,permalink_url,status_type,'
             'likes.summary(true).limit(0),comments.summary(true).limit(0),'
             'shares,reactions.summary(true).limit(0)'
         )
-        result = self._get(f'{page_id}/posts', {'fields': fields, 'limit': limit})
+        params = {'fields': fields, 'limit': limit}
+        if after:
+            params['after'] = after
+
+        result = self._get(f'{page_id}/posts', params)
         if not result:
             return None
 
@@ -306,7 +312,14 @@ class FacebookGraphService:
                 'shares': item.get('shares', {}).get('count', 0) if item.get('shares') else 0,
                 'reactions_total': item.get('reactions', {}).get('summary', {}).get('total_count', 0),
             })
-        return posts
+
+        # Extract next page cursor
+        next_cursor = None
+        paging = result.get('paging', {})
+        if paging.get('next'):
+            next_cursor = paging.get('cursors', {}).get('after')
+
+        return {'posts': posts, 'next_cursor': next_cursor}
 
     def get_post_insights_metrics(self, post_id: str) -> Optional[Dict]:
         """Get detailed insights metrics for a specific post.

services/social_publisher_service.py

@@ -603,10 +603,11 @@ class SocialPublisherService:
 
     # ---- Facebook Page Posts (read from API) ----
 
-    def get_page_recent_posts(self, company_id: int, limit: int = 10) -> Dict:
+    def get_page_recent_posts(self, company_id: int, limit: int = 10,
+                              after: str = None) -> Dict:
         """Fetch recent posts from company's Facebook page with engagement metrics.
 
-        Uses in-memory cache with 5-minute TTL.
+        Uses in-memory cache with 5-minute TTL (first page only).
         """
         db = SessionLocal()
         try:
@@ -615,31 +616,41 @@ class SocialPublisherService:
                 return {'success': False, 'error': 'Brak konfiguracji Facebook dla tej firmy.'}
 
             page_id = config.page_id
-            cache_key = (company_id, page_id)
 
-            # Check cache
+            # Cache only first page (no cursor)
+            if not after:
+                cache_key = (company_id, page_id)
                 cached = _posts_cache.get(cache_key)
                 if cached and (time.time() - cached['ts']) < _CACHE_TTL:
                     return {
                         'success': True,
                         'posts': cached['data'],
+                        'next_cursor': cached.get('next_cursor'),
                         'page_name': config.page_name or '',
                         'cached': True,
                     }
 
             from facebook_graph_service import FacebookGraphService
             fb = FacebookGraphService(access_token)
-            posts = fb.get_page_posts(page_id, limit)
+            result = fb.get_page_posts(page_id, limit, after=after)
 
-            if posts is None:
+            if result is None:
                 return {'success': False, 'error': 'Nie udało się pobrać postów z Facebook API.'}
 
-            # Update cache
-            _posts_cache[cache_key] = {'data': posts, 'ts': time.time()}
+            posts = result['posts']
+            next_cursor = result.get('next_cursor')
+
+            # Update cache for first page only
+            if not after:
+                cache_key = (company_id, page_id)
+                _posts_cache[cache_key] = {
+                    'data': posts, 'next_cursor': next_cursor, 'ts': time.time()
+                }
 
             return {
                 'success': True,
                 'posts': posts,
+                'next_cursor': next_cursor,
                 'page_name': config.page_name or '',
                 'cached': False,
             }