Set LRU values to zero to prevent cleanup when using encryption

src/appservice.ts

@@ -38,6 +38,10 @@ export function getAppservice(config: BridgeConfig, registration: IAppserviceReg
         },
         storage: storage,
         intentOptions: {
+            // If encryption support is enabled, we cannot expire Intent objects or we risk
+            // a resource contention on the Sled DB.
+            maxCached: config.encryption && 0,
+            maxAgeMs: config.encryption && 0,
             encryption: !!config.encryption,
         },
         cryptoStorage: cryptoStorage,