perf(api,frontend): index hot queries, paginate chats, fix realtime

backend/src/api/routers/chats.py

@@ -6,6 +6,7 @@ from fastapi import APIRouter, Query
 from pydantic import BaseModel
 
 from utils.jobs import enqueue
+from utils.policy import repository
 from utils.read import chats
 from utils.read.models import (
     DEFAULT_LIMIT,
@@ -35,8 +36,24 @@ async def list_chats(
     account_id: AccountId,
     limit: Limit = DEFAULT_LIMIT,
     offset: Offset = 0,
+    folder_id: Annotated[int | None, Query()] = None,
+    search: Annotated[str | None, Query()] = None,
 ) -> list[ChatListItem]:
-    return await chats.list_chats(pool, account_id, Page(limit=limit, offset=offset))
+    folder = (
+        await repository.get_folder(pool, account_id, folder_id)
+        if folder_id is not None
+        else None
+    )
+    return await chats.list_chats(
+        pool, account_id, Page(limit=limit, offset=offset), folder=folder, search=search
+    )
+
+
+@router.get("/chats/{chat_id}")
+async def get_chat(
+    pool: FromDishka[asyncpg.Pool], chat_id: int, account_id: AccountId
+) -> ChatListItem | None:
+    return await chats.get_chat(pool, account_id, chat_id)
 
 
 @router.get("/chats/{chat_id}/messages")