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Introduces CustomAssetGraduationMiddleware. When AccountsAPI or the backend websocket reports a balance for an asset that lives in customAssets[selectedAccount], the asset is removed from customAssets (EVM only). Snap-served chains (Solana, BTC, Tron) are excluded; RPC continues to be the sole balance fetcher for anything still in customAssets, so graduation is gated by sourceId on the subscription pipeline.
…et fails Introduces RpcFallbackMiddleware, inserted in the fast pipeline right after the parallel balance middleware. Any chain present in response.errors (network error, unprocessedNetworks, timeout) is handed off to RpcDataSource with the request filtered to just those chains. Successful RPC results are merged into the response and their entries are cleared from response.errors. Also adds a 15s (configurable) timeout to AccountsApiDataSource fetch; on timeout, every requested chain is marked as errored so the fallback middleware picks them up.
…urces Extracts the timeout helper into a shared `fetchWithTimeout` util and applies a configurable 15s timeout (`fetchTimeoutMs`) to PriceDataSource and TokenDataSource's API calls. On timeout the batch rejects so the surrounding middleware can proceed gracefully — metadata and price enrichment degrade instead of hanging the pipeline. Also migrates AccountsApiDataSource to use the shared util.
salimtb
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