Cache organizations and events longer in case of error. (#355)

For example, if/when us-east-2 goes down, we can still serve some
semblance of data on core website routes.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Optimized HTTP caching policies to improve data retrieval performance
and resilience across API endpoints.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: devksingh4

src/api/routes/events.ts

@@ -9,7 +9,11 @@ import {
   ScanCommand,
   UpdateItemCommand,
 } from "@aws-sdk/client-dynamodb";
-import { EVENT_CACHED_DURATION, genericConfig } from "../../common/config.js";
+import {
+  EVENT_CACHED_DURATION,
+  genericConfig,
+  STALE_IF_ERROR_CACHED_TIME,
+} from "../../common/config.js";
 import { marshall, unmarshall } from "@aws-sdk/util-dynamodb";
 import {
   BaseError,
@@ -118,7 +122,7 @@ const repeatOptions = ["weekly", "biweekly"] as const;
 const zodIncludeMetadata = z.coerce.boolean().default(false).optional().meta({
   description: "If true, include metadata for each event entry.",
 });
-export const CLIENT_HTTP_CACHE_POLICY = `public, max-age=${EVENT_CACHED_DURATION}, stale-while-revalidate=420, stale-if-error=3600`;
+export const CLIENT_HTTP_CACHE_POLICY = `public, max-age=${EVENT_CACHED_DURATION}, stale-while-revalidate=${EVENT_CACHED_DURATION * 2}, stale-if-error=${STALE_IF_ERROR_CACHED_TIME}`;
 export type EventRepeatOptions = (typeof repeatOptions)[number];
 
 const baseSchema = z.object({

src/api/routes/organizations.ts

@@ -33,6 +33,7 @@ import {
   genericConfig,
   notificationRecipients,
   roleArns,
+  STALE_IF_ERROR_CACHED_TIME,
 } from "common/config.js";
 import { marshall, unmarshall } from "@aws-sdk/util-dynamodb";
 import { buildAuditLogTransactPut } from "api/functions/auditLog.js";
@@ -48,7 +49,7 @@ import { retryDynamoTransactionWithBackoff } from "api/utils.js";
 import { SKIP_EXTERNAL_ORG_LEAD_UPDATE } from "common/overrides.js";
 import { AvailableSQSFunctions, SQSPayload } from "common/types/sqsMessage.js";
 
-export const CLIENT_HTTP_CACHE_POLICY = `public, max-age=${ORG_DATA_CACHED_DURATION}, stale-while-revalidate=${Math.floor(ORG_DATA_CACHED_DURATION * 1.1)}, stale-if-error=3600`;
+export const CLIENT_HTTP_CACHE_POLICY = `public, max-age=${ORG_DATA_CACHED_DURATION}, stale-while-revalidate=${ORG_DATA_CACHED_DURATION * 2}, stale-if-error=${STALE_IF_ERROR_CACHED_TIME}`;
 
 const organizationsPlugin: FastifyPluginAsync = async (fastify, _options) => {
   fastify.register(rateLimiter, {

src/common/config.ts

@@ -203,6 +203,7 @@ const roleArns = {
 };
 
 export const EVENT_CACHED_DURATION = 120;
+export const STALE_IF_ERROR_CACHED_TIME = 86400; // 1 day
 
 type NotificationRecipientsType = {
   [env in RunEnvironment]: {