refactor: reuse routing and remove unused analysis helpers

app/mcp/scope.py

@@ -3,6 +3,8 @@
 from contextlib import asynccontextmanager
 from dataclasses import dataclass
 from typing import Any, AsyncIterator
+from uuid import UUID
+from sqlalchemy.ext.asyncio import AsyncSession
 from psycopg import AsyncConnection
 from app.auth.project_dependencies import ProjectContext
 from app.infra.db.project_routing import ActiveProjectRouting
@@ -18,16 +20,24 @@ from app.auth.project_dependencies import (
     get_project_timescale_connection,
 )
 from app.infra.db.metadb.database import get_metadata_session
-from app.infra.db.metadb.repositories.metadata_repository import MetadataRepository
+from app.infra.db.metadb.repositories.metadata_repository import MetadataRepository, ProjectDbRouting
 from app.infra.db.project_routing import activate_project_routing
 
 
 class QueryMetadataRepository(MetadataRepository):
-    async def get_project_db_routing(self, project_id, role):
+    def __init__(self, session: AsyncSession):
+        super().__init__(session)
+        self._routing: dict[tuple[UUID, str], ProjectDbRouting | None] = {}
+
+    async def get_project_db_routing(self, project_id: UUID, role: str) -> ProjectDbRouting | None:
+        key = (project_id, role)
+        if key in self._routing:
+            return self._routing[key]
         routing = await super().get_project_db_routing(project_id, role)
         # Existing connection generators obtain routing before awaiting a pool.
         # End that implicit SELECT transaction here, before the network wait.
         await self.session.commit()
+        self._routing[key] = routing
         return routing