feat: 1-to-1 message render + web data-lake backend

backend/src/userbot/modules/media/downloader.py

@@ -33,6 +33,11 @@ def self_destruct_ttl(message: Message) -> int | None:
     return getattr(obj, "ttl_seconds", None) if obj is not None else None
 
 
+def media_unique_id(message: Message) -> str | None:
+    _, obj = media_object(message)
+    return getattr(obj, "file_unique_id", None) if obj is not None else None
+
+
 async def capture_media(  # noqa: PLR0913
     client: Client,
     message: Message,
@@ -44,6 +49,7 @@ async def capture_media(  # noqa: PLR0913
     kind, obj = media_object(message)
     if obj is None:
         return
+    unique_id = getattr(obj, "file_unique_id", None)
     ttl = getattr(obj, "ttl_seconds", None)
     want = toggles.self_destruct_media if ttl else toggles.media
     file_size = getattr(obj, "file_size", None)
@@ -51,12 +57,25 @@ async def capture_media(  # noqa: PLR0913
     storage_key: str | None = None
     downloaded = False
     if want:
-        buffer = await client.download_media(message, in_memory=True)
-        if isinstance(buffer, BytesIO):
-            data = buffer.getvalue()
-            storage_key = ctx.storage.put(data)
-            file_size = len(data)
+        existing = await repository.current_media(
+            ctx.pool, ctx.account_id, chat_id, message_id
+        )
+        if (
+            existing is not None
+            and existing["downloaded"]
+            and existing["unique_id"] == unique_id
+            and existing["storage_key"] is not None
+        ):
+            storage_key = existing["storage_key"]
+            file_size = existing["file_size"]
             downloaded = True
+        else:
+            buffer = await client.download_media(message, in_memory=True)
+            if isinstance(buffer, BytesIO):
+                data = buffer.getvalue()
+                storage_key = ctx.storage.put(data)
+                file_size = len(data)
+                downloaded = True
     await repository.insert_media(
         ctx.pool,
         ctx.account_id,
@@ -67,5 +86,6 @@ async def capture_media(  # noqa: PLR0913
         file_size,
         mime,
         ttl,
+        unique_id,
         downloaded=downloaded,
     )