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

backend/src/api/app.py

@@ -34,6 +34,7 @@ from api.routers import (
     watches,
 )
 from dependencies.container import container
+from utils.cache import DAY_HEADERS, IMMUTABLE_HEADERS, NO_STORE_HEADERS
 from utils.env import env
 
 if env.auth.token is None:
@@ -105,8 +106,11 @@ if _spa_dir.is_dir():
     async def serve_spa(spa_path: str) -> FileResponse:
         candidate = (_spa_dir / spa_path).resolve()
         if spa_path and candidate.is_relative_to(_spa_dir) and candidate.is_file():
-            return FileResponse(candidate)
-        return FileResponse(_spa_index)
+            immutable = spa_path.startswith("_app/immutable/")
+            return FileResponse(
+                candidate, headers=IMMUTABLE_HEADERS if immutable else DAY_HEADERS
+            )
+        return FileResponse(_spa_index, headers=NO_STORE_HEADERS)
 
 
 app.add_middleware(BearerAuthMiddleware, token=_token)

backend/src/api/realtime.py

@@ -65,11 +65,16 @@ class EventHub:
             return
         account_id = event.get("account_id")
         chat_id = event.get("chat_id")
+        scoped = event.get("kind") == "presence"
         targets = [
             sub
             for sub in self._subscribers
             if sub.account_id == account_id
-            and (sub.chat_id is None or sub.chat_id == chat_id)
+            and (
+                sub.chat_id == chat_id
+                if scoped
+                else sub.chat_id is None or sub.chat_id == chat_id
+            )
         ]
         if not targets:
             return

backend/src/api/routers/avatars.py

@@ -5,6 +5,7 @@ from dishka.integrations.fastapi import DishkaRoute, FromDishka
 from fastapi import APIRouter, HTTPException, Query
 from fastapi.responses import FileResponse
 
+from utils.cache import IMMUTABLE_HEADERS, SHORT_HEADERS
 from utils.jobs import enqueue
 from utils.read.avatars import avatar_by_unique_id, avatar_history, current_avatar
 from utils.read.models import AvatarHistoryView
@@ -52,5 +53,7 @@ async def serve_avatar(
         )
         raise HTTPException(status_code=409, detail="avatar not downloaded; fetching")
     return FileResponse(
-        storage.url(avatar.storage_key), media_type=avatar.mime or "image/jpeg"
+        storage.url(avatar.storage_key),
+        media_type=avatar.mime or "image/jpeg",
+        headers=IMMUTABLE_HEADERS if unique_id is not None else SHORT_HEADERS,
     )

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")

backend/src/api/routers/media.py

@@ -5,6 +5,7 @@ from dishka.integrations.fastapi import DishkaRoute, FromDishka
 from fastapi import APIRouter, HTTPException, Query
 from fastapi.responses import FileResponse
 
+from utils.cache import DAY_HEADERS, IMMUTABLE_HEADERS
 from utils.read.media import (
     get_media,
     get_media_version,
@@ -47,6 +48,7 @@ async def serve_media_version(
     return FileResponse(
         storage.url(version.storage_key),
         media_type=version.mime or "application/octet-stream",
+        headers=IMMUTABLE_HEADERS,
     )
 
 
@@ -80,4 +82,5 @@ async def serve_media(
     return FileResponse(
         storage.url(media.storage_key),
         media_type=media.mime or "application/octet-stream",
+        headers=DAY_HEADERS,
     )