added manual post add

src/database/client.py

@@ -84,8 +84,6 @@ class DatabaseClient:
 
     async def save_linkedin_posts(self, posts: List[LinkedInPost]) -> List[LinkedInPost]:
         """Save LinkedIn posts (bulk)."""
-        from datetime import datetime
-
         seen = set()
         unique_posts = []
         for p in posts:
@@ -99,11 +97,9 @@ class DatabaseClient:
 
         data = []
         for p in unique_posts:
-            post_dict = p.model_dump(exclude={"id", "scraped_at"}, exclude_none=True)
-            if "user_id" in post_dict:
-                post_dict["user_id"] = str(post_dict["user_id"])
-            if "post_date" in post_dict and isinstance(post_dict["post_date"], datetime):
-                post_dict["post_date"] = post_dict["post_date"].isoformat()
+            # Use JSON mode so UUIDs/datetimes are serialized before the Supabase client
+            # builds its request payload.
+            post_dict = p.model_dump(mode="json", exclude={"id", "scraped_at"}, exclude_none=True)
             data.append(post_dict)
 
         if not data:
@@ -176,6 +172,15 @@ class DatabaseClient:
             await cache.invalidate_linkedin_posts(user_id)
         logger.info(f"Deleted LinkedIn post: {post_id}")
 
+    async def get_linkedin_post(self, post_id: UUID) -> Optional[LinkedInPost]:
+        """Get a single LinkedIn post by ID."""
+        result = await asyncio.to_thread(
+            lambda: self.client.table("linkedin_posts").select("*").eq("id", str(post_id)).limit(1).execute()
+        )
+        if not result.data:
+            return None
+        return LinkedInPost(**result.data[0])
+
     async def get_unclassified_posts(self, user_id: UUID) -> List[LinkedInPost]:
         """Get all LinkedIn posts without a post_type_id."""
         result = await asyncio.to_thread(