feat: add api and mcp

backend/src/api/routers/chats.py

@@ -0,0 +1,68 @@
+from typing import Annotated
+
+import asyncpg
+from dishka.integrations.fastapi import DishkaRoute, FromDishka
+from fastapi import APIRouter, Query
+
+from utils.read import chats
+from utils.read.models import (
+    DEFAULT_LIMIT,
+    ChatListItem,
+    MessageVersionView,
+    MessageView,
+    Page,
+)
+
+router = APIRouter(prefix="/api", tags=["chats"], route_class=DishkaRoute)
+
+AccountId = Annotated[int, Query()]
+Limit = Annotated[int, Query()]
+Offset = Annotated[int, Query()]
+
+
+@router.get("/chats")
+async def list_chats(
+    pool: FromDishka[asyncpg.Pool],
+    account_id: AccountId,
+    limit: Limit = DEFAULT_LIMIT,
+    offset: Offset = 0,
+) -> list[ChatListItem]:
+    return await chats.list_chats(pool, account_id, Page(limit=limit, offset=offset))
+
+
+@router.get("/chats/{chat_id}/messages")
+async def chat_history(
+    pool: FromDishka[asyncpg.Pool],
+    chat_id: int,
+    account_id: AccountId,
+    limit: Limit = DEFAULT_LIMIT,
+    offset: Offset = 0,
+    include_deleted: Annotated[bool, Query()] = True,
+) -> list[MessageView]:
+    return await chats.get_chat_history(
+        pool,
+        account_id,
+        chat_id,
+        Page(limit=limit, offset=offset),
+        include_deleted=include_deleted,
+    )
+
+
+@router.get("/chats/{chat_id}/messages/{message_id}/versions")
+async def message_versions(
+    pool: FromDishka[asyncpg.Pool], chat_id: int, message_id: int, account_id: AccountId
+) -> list[MessageVersionView]:
+    return await chats.get_message_versions(pool, account_id, chat_id, message_id)
+
+
+@router.get("/deleted")
+async def deleted_messages(
+    pool: FromDishka[asyncpg.Pool],
+    account_id: AccountId,
+    chat_id: Annotated[int | None, Query()] = None,
+    limit: Limit = DEFAULT_LIMIT,
+    offset: Offset = 0,
+) -> list[MessageView]:
+    return await chats.get_deleted_messages(
+        pool, account_id, Page(limit=limit, offset=offset), chat_id=chat_id
+    )