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🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This reverts commit dfb64d7.
📝 WalkthroughWalkthroughThis PR adds fallback support for Zcash mainnet by integrating the Blockchair API as a secondary provider. It updates the CSP policy to allow the Blockchair API domain and implements fallback logic in UtxoBaseAdapter to fall back to Blockchair when the primary HTTP provider fails for transaction operations. Changes
Sequence DiagramsequenceDiagram
participant Client as UtxoAdapter
participant Primary as Primary HTTP<br/>Provider
participant Blockchair as Blockchair<br/>API
Client->>Primary: Request transaction/<br/>broadcast
Primary--xClient: Fails (e.g., endpoint error)
Note over Client: Zcash mainnet<br/>detected
Client->>Blockchair: Fallback: fetch raw hex<br/>or push transaction
alt Blockchair succeeds
Blockchair-->>Client: Return hex/<br/>tx_hash
Client->>Client: Return result
else Blockchair fails
Blockchair--xClient: Error
Client--xClient: Re-throw original<br/>error
end
Estimated code review effort🎯 2 (Simple) | ⏱️ ~15 minutes
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✨ Finishing touches
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🧹 Nitpick comments (2)
packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts (2)
343-359: Zcash input getTransaction fallback is sensible; consider small robustness/reuse tweaks.The Zcash‑only Blockchair fallback here is well‑scoped and keeps the existing behavior for other UTXO chains, while still providing a valid
hexfor signing when Unchained fails.Two minor follow‑ups you might consider:
- Guard against unexpected Blockchair shapes: defensively check
data?.data?.[input.txid]?.raw_transactionbefore dereferencing, and throw a clearer error if it’s missing rather than risking a genericTypeError.- Since very similar Blockchair logic also appears in
broadcastTransaction, a tiny private helper (e.g.fetchZcashRawTxFromBlockchair(txid)) would de‑duplicate the URL and error‑shape handling.Functionally this looks good; these are mostly about future maintainability and clearer failures if Blockchair ever changes its response.
Please ensure your manual tests cover a case where Unchained fails for at least one ZEC input so the Blockchair path is exercised end‑to‑end.
563-581: Broadcast fallback via Blockchair is aligned with the intent; error messaging could be richer.The Zcash‑only
sendTxfallback tohttps://api.blockchair.com/zcash/push/transactionis structured correctly and returns a hash‑like value, so callers still see the same shape on success.Two optional improvements:
- Blockchair error details are usually nested (e.g. under a
contextobject). Right now the thrown message falls back toresponse.statusTextwhendata.erroris absent, which can hide the more specific reason. Parsing and including the most informative field (when present) would make debugging easier.- As above, extracting the Blockchair URL and basic POST wiring into a shared helper would avoid duplication between this and the raw‑tx fallback, and centralize any future auth/key handling.
Behaviorally this achieves the fallback goal; refinements above are nice‑to‑haves rather than blockers.
Please double‑check via tests that:
this.providers.http.sendTx()and the Blockchair call both resolve to the same logical type (string tx hash), and- the fallback path works when Unchained returns both network errors and 4xx/5xx responses.
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headers/csps/chains/zcash.ts(1 hunks)packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts(2 hunks)
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📓 Path-based instructions (3)
**/*.{ts,tsx,js,jsx}
📄 CodeRabbit inference engine (CLAUDE.md)
**/*.{ts,tsx,js,jsx}: Never assume a library is available - always check imports/package.json first
Prefer composition over inheritance
Write self-documenting code with clear variable and function names
Keep functions small and focused on a single responsibility
Avoid deep nesting - use early returns instead
Prefer procedural and easy to understand code
Never expose, log, or commit secrets, API keys, or credentials
Validate all inputs, especially user inputs
Handle errors gracefully with meaningful messages
Don't silently catch and ignore exceptions
Log errors appropriately for debugging
Provide fallback behavior when possible
Use appropriate data structures for the task
Never add code comments unless explicitly requested
When modifying code, do not add comments that reference previous implementations or explain what changed. Comments should only describe the current logic and functionality.
Use meaningful names for branches, variables, and functions
Always runyarn lint --fixandyarn type-checkafter making changes
Avoidletvariable assignments - preferconstwith inline IIFE switch statements or extract to functions for conditional logic
Files:
headers/csps/chains/zcash.tspackages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
**/*.{ts,tsx}
📄 CodeRabbit inference engine (CLAUDE.md)
**/*.{ts,tsx}: Avoid useEffect where practical - use it only when necessary and following best practices
Avoid 'any' types - use specific type annotations instead
For default values with user overrides, use computed values (useMemo) instead of useEffect - pattern:userSelected ?? smartDefault ?? fallback
When function parameters are unused due to interface requirements, refactor the interface or implementation to remove them rather than prefixing with underscore
Sanitize data before displaying to prevent XSS
Memoize aggressively - wrap component variables inuseMemoand callbacks inuseCallbackwhere possible
For static JSX icon elements (e.g.,<TbCopy />) that don't depend on state/props, define them as constants outside the component to avoid re-renders instead of using useMemo
Account for light/dark mode usinguseColorModeValuehook
Account for responsive mobile designs in all UI components
When applying styles, use the existing standards and conventions of the codebase
Use Chakra UI components and conventions
All copy/text must use translation keys - never hardcode strings
Use the translation hook:useTranslate()fromreact-polyglot
UseuseFeatureFlag('FlagName')hook to access feature flag values in components
Prefertypeoverinterfacefor type definitions
Use strict typing - avoidany
UseNominaltypes for domain identifiers (e.g.,WalletId,AccountId)
Import types from@shapeshiftoss/caipfor chain/account/asset IDs
UseuseAppSelectorfor Redux state
UseuseAppDispatchfor Redux actions
Memoize expensive computations withuseMemo
Memoize callbacks withuseCallback
**/*.{ts,tsx}: UseResult<T, E>pattern for error handling in swappers and APIs; ALWAYS useOk()andErr()from@sniptt/monads; AVOID throwing within swapper API implementations
ALWAYS use custom error classes from@shapeshiftoss/errorswith meaningful error codes for internationalization and relevant details in error objects
ALWAYS wrap async op...
Files:
headers/csps/chains/zcash.tspackages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
**/*.{js,jsx,ts,tsx}
📄 CodeRabbit inference engine (.cursor/rules/naming-conventions.mdc)
**/*.{js,jsx,ts,tsx}: Use camelCase for variables, functions, and methods with descriptive names that explain the purpose
Use verb prefixes for functions that perform actions (e.g., fetch, validate, execute, update, calculate)
Use UPPER_SNAKE_CASE for constants and configuration values with descriptive names
Usehandleprefix for event handlers with descriptive names in camelCase
Use descriptive boolean variable names withis,has,can,shouldprefixes
Use named exports for components, functions, and utilities instead of default exports
Use descriptive import names and avoid renaming imports unless necessary
Avoid non-descriptive variable names likedata,item,obj, and single-letter variable names except in loops
Avoid abbreviations in names unless they are widely understood
Avoid generic function names likefn,func, orcallback
Files:
headers/csps/chains/zcash.tspackages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
🧠 Learnings (11)
📓 Common learnings
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 11170
File: patches/@shapeshiftoss+bitcoinjs-lib+7.0.0-shapeshift.0.patch:9-19
Timestamp: 2025-11-25T21:43:10.838Z
Learning: In shapeshift/web, gomesalexandre will not expand PR scope to fix latent bugs in unused API surface (like bitcoinjs-lib patch validation methods) when comprehensive testing proves the actual used code paths work correctly, preferring to avoid costly hdwallet/web verdaccio publish cycles and full regression testing for conceptual issues with zero runtime impact.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10232
File: packages/unchained-client/openapitools.json:61-61
Timestamp: 2025-08-08T10:23:16.843Z
Learning: In shapeshift/web, for temporary “monkey patch” PRs (e.g., packages/unchained-client/openapitools.json using jsDelivr CDN refs like cosmos/mayachain), gomesalexandre is fine with branch-based URLs and does not want SHA pinning. Treat this as a scoped exception to their general preference for pinned dependencies/refs.
Learnt from: premiumjibles
Repo: shapeshift/web PR: 10361
File: src/pages/Markets/components/CardWithSparkline.tsx:83-92
Timestamp: 2025-08-25T23:32:13.876Z
Learning: In shapeshift/web PR #10361, premiumjibles considered the nested button accessibility issue (ChartErrorFallback retry Button inside Card rendered as Button in CardWithSparkline.tsx) out of scope for the error boundaries feature PR, consistent with deferring minor a11y improvements to follow-up PRs.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10461
File: src/plugins/walletConnectToDapps/utils/tenderly/index.ts:0-0
Timestamp: 2025-09-12T11:56:19.437Z
Learning: gomesalexandre rejected verbose try/catch error handling for address validation in Tenderly integration (PR #10461), calling the approach "ugly" but still implemented safety measures in commit ad7e424b89, preferring cleaner safety implementations over defensive programming patterns.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10458
File: src/plugins/walletConnectToDapps/components/modals/EIP155SignTypedDataConfirmation.tsx:55-55
Timestamp: 2025-09-10T15:35:46.223Z
Learning: gomesalexandre prefers fail-fast early returns over graceful degradation when critical data is missing in WalletConnect flows (like peer metadata in EIP155SignTypedDataConfirmation.tsx). He favors "safety first, always double-wrap" approach and believes missing peer metadata indicates bigger problems that should be surfaced explicitly rather than masked with partial UI rendering.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10461
File: src/plugins/walletConnectToDapps/components/modals/EIP712MessageDisplay.tsx:21-24
Timestamp: 2025-09-12T13:16:27.004Z
Learning: gomesalexandre declined to add error boundaries to WalletConnect modals in PR #10461, stating "no error boundaries in this pr ser", consistent with his preference to keep PR scope focused and defer tangential improvements to separate efforts.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10418
File: src/plugins/walletConnectToDapps/components/header/WalletConnectToDappsHeaderButton.tsx:0-0
Timestamp: 2025-09-08T22:00:48.005Z
Learning: gomesalexandre dismissed an aria-label accessibility suggestion with "meh" in PR #10418 for WalletConnectToDappsHeaderButton.tsx, consistent with the team's pattern of deferring minor a11y improvements to follow-up PRs rather than expanding feature PR scope.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10461
File: src/plugins/walletConnectToDapps/components/WalletConnectSigningModal/content/SendTransactionContent.tsx:0-0
Timestamp: 2025-09-12T10:44:46.723Z
Learning: gomesalexandre dismissed a clipboard error handling suggestion in PR #10461 for SendTransactionContent.tsx, demonstrating that the current navigator.clipboard.writeText implementation works as expected and preferring to keep it simple without additional try/catch error handling.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10879
File: src/context/WalletProvider/WalletConnectV2/components/WalletConnectDirectRow.tsx:64-81
Timestamp: 2025-10-22T22:11:22.918Z
Learning: In early WalletConnect POC/features behind a flag, gomesalexandre prioritizes connection correctness/stability over UX polish; minimal safety guards (like preventing concurrent connects) are preferred, while visuals will be wired later by reallybeard.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10596
File: src/components/Layout/Header/NavBar/WalletConnectedMenu.tsx:77-99
Timestamp: 2025-10-01T07:42:40.195Z
Learning: In WalletConnectedMenu.tsx's handleReconnectWallet handler, gomesalexandre prefers throwing an error for unsupported wallet types in the default case rather than gracefully handling with a fallback. His reasoning: "if we have a problem here, we have bigger problems" - only supported wallets (KeepKey, Ledger, MetaMask, Coinbase, Phantom) should reach the reconnect flow when disconnected/locked, so encountering an unsupported type indicates a larger architectural issue that should be surfaced explicitly rather than masked with graceful degradation.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10206
File: src/config.ts:127-128
Timestamp: 2025-08-07T11:20:44.614Z
Learning: gomesalexandre prefers required environment variables without default values in the config file (src/config.ts). They want explicit configuration and fail-fast behavior when environment variables are missing, rather than having fallback defaults.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10461
File: src/plugins/walletConnectToDapps/components/modals/ContractInteractionBreakdown.tsx:0-0
Timestamp: 2025-09-13T16:45:18.813Z
Learning: gomesalexandre prefers aggressively deleting unused/obsolete code files ("ramboing") rather than fixing technical issues in code that won't be used, demonstrating his preference for keeping codebases clean and PR scope focused.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10458
File: src/plugins/walletConnectToDapps/types.ts:7-7
Timestamp: 2025-09-10T15:34:29.604Z
Learning: gomesalexandre is comfortable relying on transitive dependencies (like abitype through ethers/viem) rather than explicitly declaring them in package.json, preferring to avoid package.json bloat when the transitive dependency approach works reliably in practice.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10503
File: .env:56-56
Timestamp: 2025-09-16T13:17:02.938Z
Learning: gomesalexandre prefers to enable feature flags globally in the base .env file when the intent is to activate features everywhere, even when there are known issues like crashes, demonstrating his preference for intentional global feature rollouts over cautious per-environment enablement.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10249
File: src/pages/ThorChainLP/components/ReusableLpStatus/TransactionRow.tsx:447-503
Timestamp: 2025-08-13T17:07:10.763Z
Learning: gomesalexandre prefers relying on TypeScript's type system for validation rather than adding defensive runtime null checks when types are properly defined. They favor a TypeScript-first approach over defensive programming with runtime validations.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10276
File: src/hooks/useActionCenterSubscribers/useThorchainLpDepositActionSubscriber.tsx:61-66
Timestamp: 2025-08-14T17:51:47.556Z
Learning: gomesalexandre is not concerned about structured logging and prefers to keep console.error usage as-is rather than implementing structured logging patterns, even when project guidelines suggest otherwise.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10413
File: src/components/Modals/FiatRamps/fiatRampProviders/onramper/utils.ts:29-55
Timestamp: 2025-09-02T14:26:19.028Z
Learning: gomesalexandre prefers to keep preparatory/reference code simple until it's actively consumed, rather than implementing comprehensive error handling, validation, and robustness improvements upfront. They prefer to add these improvements when the code is actually being used in production.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10276
File: src/pages/ThorChainLP/components/ReusableLpStatus/TransactionRow.tsx:396-402
Timestamp: 2025-08-14T17:55:57.490Z
Learning: gomesalexandre is comfortable with functions/variables that return undefined or true (tri-state) when only the truthy case matters, preferring to rely on JavaScript's truthy/falsy behavior rather than explicitly returning boolean values.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10783
File: src/context/ModalStackProvider/useModalRegistration.ts:30-41
Timestamp: 2025-10-16T11:14:40.657Z
Learning: gomesalexandre prefers to add lint rules (like typescript-eslint/strict-boolean-expressions for truthiness checks on numbers) to catch common issues project-wide rather than relying on code review to catch them.
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10206
File: src/lib/moralis.ts:47-85
Timestamp: 2025-08-07T11:22:16.983Z
Learning: gomesalexandre prefers console.error over structured logging for Moralis API integration debugging, as they find it more conventional and prefer to examine XHR requests directly rather than rely on structured logs for troubleshooting.
📚 Learning: 2025-12-03T23:19:39.158Z
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 11275
File: headers/csps/chains/plasma.ts:1-10
Timestamp: 2025-12-03T23:19:39.158Z
Learning: For CSP files in headers/csps/chains/, gomesalexandre prefers using Vite's loadEnv() pattern directly to load environment variables (e.g., VITE_PLASMA_NODE_URL, VITE_MONAD_NODE_URL) for consistency with existing second-class chain CSP files, rather than using getConfig() from src/config.ts, even though other parts of the codebase use validated config values.
Applied to files:
headers/csps/chains/zcash.ts
📚 Learning: 2025-11-24T21:20:04.979Z
Learnt from: CR
Repo: shapeshift/web PR: 0
File: CLAUDE.md:0-0
Timestamp: 2025-11-24T21:20:04.979Z
Learning: Applies to src/config.ts : Default values always come from environment variables prefixed with `VITE_FEATURE_`
Applied to files:
headers/csps/chains/zcash.ts
📚 Learning: 2025-09-12T13:44:17.019Z
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10461
File: src/plugins/walletConnectToDapps/hooks/useSimulateEvmTransaction.ts:0-0
Timestamp: 2025-09-12T13:44:17.019Z
Learning: gomesalexandre prefers letting chain adapter errors throw naturally in useSimulateEvmTransaction rather than adding explicit error handling for missing adapters, consistent with his fail-fast approach and dismissal of defensive validation as "stale" in WalletConnect transaction simulation flows.
Applied to files:
packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
📚 Learning: 2025-11-19T16:59:50.569Z
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 11012
File: src/context/WalletProvider/Vultisig/components/Connect.tsx:24-59
Timestamp: 2025-11-19T16:59:50.569Z
Learning: In src/context/WalletProvider/*/components/Connect.tsx files across the ShapeShift web codebase, the established pattern for handling null/undefined adapter from getAdapter() is to simply check `if (adapter) { ... }` without an else clause. All wallet Connect components (Coinbase, Keplr, Phantom, Ledger, MetaMask, WalletConnectV2, KeepKey, Vultisig) follow this pattern—they reset loading state after the if block but do not show error messages when adapter is null. This is an intentional design decision and should be maintained for consistency.
Applied to files:
packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
📚 Learning: 2025-08-26T19:04:38.672Z
Learnt from: kaladinlight
Repo: shapeshift/web PR: 10369
File: packages/chain-adapters/src/cosmossdk/CosmosSdkBaseAdapter.ts:167-176
Timestamp: 2025-08-26T19:04:38.672Z
Learning: In packages/chain-adapters/src/cosmossdk/CosmosSdkBaseAdapter.ts, when processing assets from data.assets.reduce(), the team prefers using empty catch blocks to gracefully skip any assets that fail processing, rather than specific error type handling, to avoid useless noise and ensure robust asset filtering.
Applied to files:
packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
📚 Learning: 2025-10-01T07:42:40.195Z
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 10596
File: src/components/Layout/Header/NavBar/WalletConnectedMenu.tsx:77-99
Timestamp: 2025-10-01T07:42:40.195Z
Learning: In WalletConnectedMenu.tsx's handleReconnectWallet handler, gomesalexandre prefers throwing an error for unsupported wallet types in the default case rather than gracefully handling with a fallback. His reasoning: "if we have a problem here, we have bigger problems" - only supported wallets (KeepKey, Ledger, MetaMask, Coinbase, Phantom) should reach the reconnect flow when disconnected/locked, so encountering an unsupported type indicates a larger architectural issue that should be surfaced explicitly rather than masked with graceful degradation.
Applied to files:
packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
📚 Learning: 2025-12-09T21:06:09.903Z
Learnt from: gomesalexandre
Repo: shapeshift/web PR: 11335
File: packages/swapper/src/swappers/CetusSwapper/endpoints.ts:66-68
Timestamp: 2025-12-09T21:06:09.903Z
Learning: In packages/swapper/src/swappers/CetusSwapper/endpoints.ts, gomesalexandre is comfortable with throwing errors directly in getUnsignedSuiTransaction and similar transaction preparation methods, rather than using the Result pattern. The Result pattern with makeSwapErrorRight/TradeQuoteError is primarily for the main swapper API methods (getTradeQuote, getTradeRate), while helper/preparation methods can use throws.
Applied to files:
packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
📚 Learning: 2025-11-24T21:20:57.909Z
Learnt from: CR
Repo: shapeshift/web PR: 0
File: .cursor/rules/swapper.mdc:0-0
Timestamp: 2025-11-24T21:20:57.909Z
Learning: Applies to packages/swapper/src/swappers/*/*.ts : Reuse executeEvmTransaction utility for EVM-based swappers instead of implementing custom transaction execution
Applied to files:
packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
📚 Learning: 2025-08-04T15:33:36.789Z
Learnt from: NeOMakinG
Repo: shapeshift/web PR: 10171
File: src/components/MultiHopTrade/components/TradeConfirm/components/ExpandedStepperSteps.tsx:209-254
Timestamp: 2025-08-04T15:33:36.789Z
Learning: In transaction status checking for swapper transactions, when determining if a transaction is "seen", query failures should be treated as "not seen" rather than adding explicit error handling. This allows natural fallback to default explorers when specialized explorer APIs are unavailable or failing.
Applied to files:
packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
📚 Learning: 2025-12-04T22:57:50.850Z
Learnt from: kaladinlight
Repo: shapeshift/web PR: 11290
File: packages/chain-adapters/src/utxo/zcash/ZcashChainAdapter.ts:48-51
Timestamp: 2025-12-04T22:57:50.850Z
Learning: In packages/chain-adapters/src/**/*ChainAdapter.ts files, the getName() method uses the pattern `const enumIndex = Object.values(ChainAdapterDisplayName).indexOf(ChainAdapterDisplayName.XXX); return Object.keys(ChainAdapterDisplayName)[enumIndex]` to reverse-lookup the enum key from its value. This is the established pattern used consistently across almost all chain adapters (Bitcoin, Ethereum, Litecoin, Dogecoin, Polygon, Arbitrum, Cosmos, etc.) and should be preserved for consistency when adding new chain adapters.
Applied to files:
packages/chain-adapters/src/utxo/UtxoBaseAdapter.ts
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🔇 Additional comments (1)
headers/csps/chains/zcash.ts (1)
9-13: CSP update correctly allows the new Blockchair calls.Including
'https://api.blockchair.com'inconnect-srcis consistent with the new Zcash fallback endpoints and the existingloadEnvpattern; nothing else stands out here.Please confirm in a browser (devtools > Security / console) that ZEC sends hitting Blockchair no longer trigger CSP violations when Unchained is down.
Yep, that's unfortunately a thing though by design there! |


Description
Fallback to Blockchair Zcash endpoints for currently sad unchained endpoints in both dev/prod for Zcash.
Note, endpoints are not guaranteed to be sad, they were when I captured #11344 but seems to be either transient and/or a byproduct of your specific UTXO set and slow indexing.
Issue (if applicable)
closes #11344
Risk
Negative risks? This is redundancy so it's less risks than before.
Testing
Engineering
Operations
Screenshots (if applicable)
https://jam.dev/c/52fe675b-0734-4994-bb58-3f609aed8ba3
Summary by CodeRabbit
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