fixed reasoning

backend/app/projects/context.py

@@ -1,3 +1,4 @@
+import time
 from typing import Any
 
 from sqlalchemy.orm import Session
@@ -8,9 +9,28 @@ from app.projects.service import ProjectService
 
 MAX_PROJECTS_IN_CONTEXT = 20
 MAX_OPEN_PER_PROJECT = 8
+PROJECTS_CACHE_SEC = 120
+
+_cache: dict[str, Any] = {"data": None, "expires_at": 0.0}
 
 
-def get_projects_snapshot(db: Session) -> dict[str, Any]:
+def invalidate_projects_snapshot_cache() -> None:
+    _cache["data"] = None
+    _cache["expires_at"] = 0.0
+
+
+def get_projects_snapshot(db: Session, *, force: bool = False) -> dict[str, Any]:
+    now = time.time()
+    if not force and _cache["data"] is not None and now < _cache["expires_at"]:
+        return _cache["data"]
+
+    snapshot = _fetch_projects_snapshot(db)
+    _cache["data"] = snapshot
+    _cache["expires_at"] = now + PROJECTS_CACHE_SEC
+    return snapshot
+
+
+def _fetch_projects_snapshot(db: Session) -> dict[str, Any]:
     settings = get_settings()
     service = ProjectService(db)