use post versions to find updates

e621.py

@@ -132,6 +132,35 @@ class E621Post:
     duration: Optional[float]
 
 
+@dataclass_json
+@dataclass
+class E621PostVersion:
+    id: int
+    post_id: int
+    tags: str
+    updater_id: int
+    updated_at: str
+    rating: Rating
+    parent_id: Optional[int]
+    source: Optional[str]
+    description: str
+    reason: Optional[str]
+    locked_tags: Optional[str]
+    added_tags: List[str]
+    removed_tags: List[str]
+    added_locked_tags: List[str]
+    removed_locked_tags: List[str]
+    rating_changed: bool
+    parent_changed: bool
+    source_changed: bool
+    description_changed: bool
+    version: int
+    obsolete_added_tags: str
+    obsolete_removed_tags: str
+    unchanged_tags: str
+    updater_name: str
+
+
 class E621:
     def __init__(self):
         self.client = httpx.AsyncClient(headers={'user-agent': 'bot/1.0 (bakatrouble)'}, base_url='https://e621.net')
@@ -142,3 +171,7 @@ class E621:
 
     async def get_post(self, post_id: str) -> E621Post:
         return (await self.get_posts(f'id:{post_id}'))[0]
+
+    async def get_post_versions(self, start_id=0, page=1, limit=320) -> List[E621PostVersion]:
+        r = (await self.client.get('/post_versions.json', params={'search[start_id]': start_id, 'limit': limit})).json()
+        return [E621PostVersion.from_dict(p) for p in r]