feat(misc): add ProcessedPostsManager utility

misc.py

@@ -0,0 +1,32 @@
+from typing import Set, List
+
+
+class ProcessedPostsManager:
+    def __init__(self, file_path: str = "processed.txt"):
+        self.file_path = file_path
+        self.processed_posts: Set[int] = self._load()
+
+    def _load(self) -> Set[int]:
+        try:
+            with open(self.file_path, "r", encoding="utf-8") as processed:
+                return set(processed.readlines())
+
+        except:
+            return set()
+
+    def _save(self):
+        with open(self.file_path, "w", encoding="utf-8") as processed:
+            processed.writelines(lines=self.processed_posts)
+
+    def is_processed(self, post_id: int) -> bool:
+        return post_id in self.processed_posts
+
+    def mark_processed(self, post_id: int):
+        self.processed_posts.add(post_id)
+        self._save()
+
+    def add_existing_posts(self, post_ids: List[int]):
+        for post_id in post_ids:
+            self.processed_posts.add(post_id)
+
+        self._save()