Add cached-first TeamSnap reads

PLAN.md

@@ -18,6 +18,7 @@
 - Client-side clip and assignment reads now persist locally and revalidate against server ETags.
 - Normalized playback media is cacheable for offline clip playback.
 - Auth and session responses remain `no-store` so cached data is limited to app-owned clip state.
+- TeamSnap read queries now use cached-first stale-while-revalidate behavior on the client.
 
 ## Storage Status
 - Backend media persists in the `backend-media` named Docker volume.

README.md

@@ -58,7 +58,7 @@ Walkup is a collaborative baseball walk-up song app built as a React PWA with a
 
 ## Frontend Responsibilities
 - TeamSnap SDK bootstrap with server-issued access tokens
-- Team/game browsing from TeamSnap
+- Team/game browsing from TeamSnap with cached-first revalidation
 - Song upload and clip creation
 - Game assignments and gameday console
 - PWA install/offline shell

docs/architecture.md

@@ -15,6 +15,7 @@ Walkup is a baseball walk-up song app with a React PWA frontend and a FastAPI ba
 - `frontend/` contains the React application.
 - The app uses React Router for navigation and TanStack Query for server state.
 - TeamSnap data is loaded through the official JavaScript SDK from the browser after the backend provides an access token.
+- Read-only TeamSnap queries use a stale-while-revalidate cache in the browser so the UI can render immediately from stored data and update when a fresh response arrives.
 - The UI includes player, gameday, and library views for clip management and gameday playback.
 - The app is shipped as a PWA with install and offline-prep behavior.
 - Normalized playback media is cached by the service worker, and the backend marks those files cacheable while keeping auth/session responses `no-store`.

frontend/src/hooks/useWalkupContext.tsx

@@ -5,7 +5,7 @@ import { api } from "../api/client";
 import type { TeamSnapEvent, TeamSnapMember } from "../api/types";
 import { queryClient } from "../lib/queryClient";
 import { findCurrentPlayer, findNextGame, sortGames } from "../lib/teamsnapHelpers";
-import { teamsnapClient } from "../lib/teamsnap";
+import { teamSnapQueryKeys, teamsnapClient } from "../lib/teamsnap";
 import { useSession } from "./useSession";
 
 const TEAM_STORAGE_KEY = "walkup.selectedTeamId";
@@ -24,10 +24,13 @@ const WalkupContext = createContext<WalkupContextValue | null>(null);
 function useBuildWalkupContext() {
   const sessionQuery = useSession();
   const isTeamSnap = sessionQuery.data?.authenticated === true && sessionQuery.data?.provider === "teamsnap";
+  const teamSnapCacheScope = isTeamSnap
+    ? String(sessionQuery.data?.external_user_id ?? sessionQuery.data?.external_team_id ?? "teamsnap")
+    : "anonymous";
   const [selectedTeamId, setSelectedTeamId] = useState(readStoredTeamId);
   const teamsQuery = useQuery({
-    queryKey: ["teamsnap", "teams"],
-    queryFn: () => teamsnapClient.loadTeams(),
+    queryKey: teamSnapQueryKeys.teams(teamSnapCacheScope),
+    queryFn: () => teamsnapClient.loadTeams(teamSnapCacheScope),
     enabled: isTeamSnap,
     networkMode: "always",
     retry: 0,
@@ -53,15 +56,15 @@ function useBuildWalkupContext() {
   }, [resolvedTeamId, selectedTeam, selectedTeamId, teams.length]);
 
   const membersQuery = useQuery({
-    queryKey: ["teamsnap", "members", resolvedTeamId],
-    queryFn: () => teamsnapClient.loadMembers(resolvedTeamId),
+    queryKey: teamSnapQueryKeys.members(teamSnapCacheScope, resolvedTeamId),
+    queryFn: () => teamsnapClient.loadMembers(resolvedTeamId, teamSnapCacheScope),
     enabled: isTeamSnap && Boolean(resolvedTeamId),
     networkMode: "always",
     retry: 0,
   });
   const eventsQuery = useQuery({
-    queryKey: ["teamsnap", "events", resolvedTeamId],
-    queryFn: () => teamsnapClient.loadEvents(resolvedTeamId),
+    queryKey: teamSnapQueryKeys.events(teamSnapCacheScope, resolvedTeamId),
+    queryFn: () => teamsnapClient.loadEvents(resolvedTeamId, teamSnapCacheScope),
     enabled: isTeamSnap && Boolean(resolvedTeamId),
     networkMode: "always",
     retry: 0,
@@ -112,6 +115,7 @@ function useBuildWalkupContext() {
     isTeamSnap,
     sessionQuery,
     teamsQuery,
+    teamSnapCacheScope,
     selectedTeam,
     selectedTeamId,
     hasSelectedTeam: Boolean(resolvedTeamId),

frontend/src/lib/teamSnapCache.ts

@@ -0,0 +1,86 @@
+import type { QueryKey } from "@tanstack/react-query";
+
+import { queryClient } from "./queryClient";
+import { readCachedValue, writeCachedValue } from "./offlineCache";
+
+const inFlightRequests = new Map<string, Promise<unknown>>();
+
+export function normalizeTeamSnapCacheScope(scope?: string | number | null): string {
+  const value = scope == null ? "" : String(scope).trim();
+  return value || "anonymous";
+}
+
+function buildCacheParts(scope: string | number | null | undefined, resource: string, parts: readonly unknown[]): readonly unknown[] {
+  return ["teamsnap", normalizeTeamSnapCacheScope(scope), resource, ...parts];
+}
+
+function cacheKey(parts: readonly unknown[]): string {
+  return JSON.stringify(parts);
+}
+
+function startFreshFetch<T>(
+  cacheParts: readonly unknown[],
+  queryKey: QueryKey,
+  fetchFresh: () => Promise<T>,
+): Promise<T> {
+  const key = cacheKey(cacheParts);
+  const existing = inFlightRequests.get(key);
+  if (existing) {
+    return existing as Promise<T>;
+  }
+
+  const request = fetchFresh()
+    .then((data) => {
+      writeCachedValue(cacheParts, data);
+      queryClient.setQueryData(queryKey, data);
+      return data;
+    })
+    .finally(() => {
+      inFlightRequests.delete(key);
+    });
+
+  inFlightRequests.set(key, request);
+  return request;
+}
+
+export async function staleWhileRevalidateTeamSnap<T>({
+  cacheParts,
+  queryKey,
+  fetchFresh,
+}: {
+  cacheParts: readonly unknown[];
+  queryKey: QueryKey;
+  fetchFresh: () => Promise<T>;
+}): Promise<T> {
+  const cached = readCachedValue<T>(cacheParts);
+  if (cached) {
+    void startFreshFetch(cacheParts, queryKey, fetchFresh).catch(() => undefined);
+    return cached.data;
+  }
+
+  return startFreshFetch(cacheParts, queryKey, fetchFresh);
+}
+
+export const teamSnapQueryKeys = {
+  me(scope?: string | number | null): QueryKey {
+    return buildCacheParts(scope, "me", []);
+  },
+  teams(scope?: string | number | null): QueryKey {
+    return buildCacheParts(scope, "teams", []);
+  },
+  members(scope: string | number | null | undefined, teamId: string): QueryKey {
+    return buildCacheParts(scope, "members", [teamId]);
+  },
+  events(scope: string | number | null | undefined, teamId: string): QueryKey {
+    return buildCacheParts(scope, "events", [teamId]);
+  },
+  availabilities(scope: string | number | null | undefined, teamId: string, eventId?: string): QueryKey {
+    return buildCacheParts(scope, "availabilities", [teamId, eventId ?? ""]);
+  },
+  assignments(scope: string | number | null | undefined, teamId: string, eventId?: string): QueryKey {
+    return buildCacheParts(scope, "assignments", [teamId, eventId ?? ""]);
+  },
+  eventLineup(scope: string | number | null | undefined, teamId: string, eventId: string): QueryKey {
+    return buildCacheParts(scope, "eventLineup", [teamId, eventId]);
+  },
+};

frontend/src/lib/teamsnap.ts

@@ -11,6 +11,9 @@ import type {
   TeamSnapTeam,
   TeamSnapUser,
 } from "../api/types";
+import { staleWhileRevalidateTeamSnap, teamSnapQueryKeys } from "./teamSnapCache";
+
+export { teamSnapQueryKeys } from "./teamSnapCache";
 
 type TeamSnapSdk = {
   auth?: (token: string) => Promise<void> | void;
@@ -106,14 +109,24 @@ async function ensureAuthorized(): Promise<TeamSnapSdk> {
 }
 
 export const teamsnapClient = {
-  async loadMe(): Promise<TeamSnapUser | null> {
+  async loadMe(cacheScope?: string | number | null): Promise<TeamSnapUser | null> {
+    return staleWhileRevalidateTeamSnap<TeamSnapUser | null>({
+      cacheParts: teamSnapQueryKeys.me(cacheScope),
+      queryKey: teamSnapQueryKeys.me(cacheScope),
+      fetchFresh: async () => {
         const sdk = await ensureAuthorized();
         if (sdk.loadMe) {
           return sdk.loadMe();
         }
         return null;
       },
-  async loadTeams(): Promise<TeamSnapTeam[]> {
+    });
+  },
+  async loadTeams(cacheScope?: string | number | null): Promise<TeamSnapTeam[]> {
+    return staleWhileRevalidateTeamSnap<TeamSnapTeam[]>({
+      cacheParts: teamSnapQueryKeys.teams(cacheScope),
+      queryKey: teamSnapQueryKeys.teams(cacheScope),
+      fetchFresh: async () => {
         const sdk = await ensureAuthorized();
         if (sdk.loadTeams) {
           const teams = await sdk.loadTeams();
@@ -121,38 +134,71 @@ export const teamsnapClient = {
         }
         return [];
       },
-  async loadMembers(teamId: string): Promise<TeamSnapMember[]> {
+    });
+  },
+  async loadMembers(teamId: string, cacheScope?: string | number | null): Promise<TeamSnapMember[]> {
+    return staleWhileRevalidateTeamSnap<TeamSnapMember[]>({
+      cacheParts: teamSnapQueryKeys.members(cacheScope, teamId),
+      queryKey: teamSnapQueryKeys.members(cacheScope, teamId),
+      fetchFresh: async () => {
         const sdk = await ensureAuthorized();
         if (sdk.loadMembers) {
           return sdk.loadMembers({ teamId });
         }
         return [];
       },
-  async loadEvents(teamId: string): Promise<TeamSnapEvent[]> {
+    });
+  },
+  async loadEvents(teamId: string, cacheScope?: string | number | null): Promise<TeamSnapEvent[]> {
+    return staleWhileRevalidateTeamSnap<TeamSnapEvent[]>({
+      cacheParts: teamSnapQueryKeys.events(cacheScope, teamId),
+      queryKey: teamSnapQueryKeys.events(cacheScope, teamId),
+      fetchFresh: async () => {
         const sdk = await ensureAuthorized();
         if (sdk.loadEvents) {
           return sdk.loadEvents({ teamId });
         }
         return [];
       },
-  async loadAvailabilities(teamId: string, eventId?: string): Promise<TeamSnapAvailability[]> {
+    });
+  },
+  async loadAvailabilities(teamId: string, eventId?: string, cacheScope?: string | number | null): Promise<TeamSnapAvailability[]> {
+    return staleWhileRevalidateTeamSnap<TeamSnapAvailability[]>({
+      cacheParts: teamSnapQueryKeys.availabilities(cacheScope, teamId, eventId),
+      queryKey: teamSnapQueryKeys.availabilities(cacheScope, teamId, eventId),
+      fetchFresh: async () => {
         const sdk = await ensureAuthorized();
         if (sdk.loadAvailabilities) {
           return sdk.loadAvailabilities(eventId ? { teamId, eventId } : { teamId });
         }
         return [];
       },
-  async loadAssignments(teamId: string, eventId?: string): Promise<TeamSnapAssignment[]> {
+    });
+  },
+  async loadAssignments(teamId: string, eventId?: string, cacheScope?: string | number | null): Promise<TeamSnapAssignment[]> {
+    return staleWhileRevalidateTeamSnap<TeamSnapAssignment[]>({
+      cacheParts: teamSnapQueryKeys.assignments(cacheScope, teamId, eventId),
+      queryKey: teamSnapQueryKeys.assignments(cacheScope, teamId, eventId),
+      fetchFresh: async () => {
         const sdk = await ensureAuthorized();
         if (sdk.loadAssignments) {
           return sdk.loadAssignments(eventId ? { teamId, eventId } : { teamId });
         }
         return [];
       },
-  async loadEventLineupData(teamId: string, eventId: string): Promise<{
+    });
+  },
+  async loadEventLineupData(teamId: string, eventId: string, cacheScope?: string | number | null): Promise<{
     eventLineup: TeamSnapEventLineup | null;
     entries: TeamSnapEventLineupEntry[];
   }> {
+    return staleWhileRevalidateTeamSnap<{
+      eventLineup: TeamSnapEventLineup | null;
+      entries: TeamSnapEventLineupEntry[];
+    }>({
+      cacheParts: teamSnapQueryKeys.eventLineup(cacheScope, teamId, eventId),
+      queryKey: teamSnapQueryKeys.eventLineup(cacheScope, teamId, eventId),
+      fetchFresh: async () => {
         const sdk = await ensureAuthorized();
         if (!sdk.loadEventLineups) {
           return { eventLineup: null, entries: [] };
@@ -183,4 +229,6 @@ export const teamsnapClient = {
           return { eventLineup, entries: [] };
         }
       },
+    });
+  },
 };

frontend/src/pages/GamedayPage.tsx

@@ -8,7 +8,7 @@ import { ClipSummaryRow } from "../components/ClipSummaryRow";
 import { useClipPlayback } from "../hooks/useClipPlayback";
 import { useWalkupContext } from "../hooks/useWalkupContext";
 import { loadPreparedGame } from "../lib/offlinePrep";
-import { teamsnapClient } from "../lib/teamsnap";
+import { teamSnapQueryKeys, teamsnapClient } from "../lib/teamsnap";
 import {
   formatGameDate,
   formatGameTitle,
@@ -124,16 +124,16 @@ export function GamedayPage() {
   const assignmentList = assignmentsQuery.data ?? preparedGame?.assignments ?? [];
 
   const eventLineupQuery = useQuery({
-    queryKey: ["teamsnap", "eventLineup", teamId, resolvedSelectedGameId],
-    queryFn: () => teamsnapClient.loadEventLineupData(teamId, resolvedSelectedGameId),
+    queryKey: teamSnapQueryKeys.eventLineup(walkup.teamSnapCacheScope, teamId, resolvedSelectedGameId),
+    queryFn: () => teamsnapClient.loadEventLineupData(teamId, resolvedSelectedGameId, walkup.teamSnapCacheScope),
     enabled: Boolean(teamId && resolvedSelectedGameId),
     networkMode: "always",
     retry: 0,
   });
 
   const availabilityQuery = useQuery({
-    queryKey: ["teamsnap", "availabilities", teamId, resolvedSelectedGameId],
-    queryFn: () => teamsnapClient.loadAvailabilities(teamId, resolvedSelectedGameId),
+    queryKey: teamSnapQueryKeys.availabilities(walkup.teamSnapCacheScope, teamId, resolvedSelectedGameId),
+    queryFn: () => teamsnapClient.loadAvailabilities(teamId, resolvedSelectedGameId, walkup.teamSnapCacheScope),
     enabled: Boolean(teamId && resolvedSelectedGameId),
     networkMode: "always",
     retry: 0,