onchain storage

[aayusha59]

Summary by CodeRabbit

• New Features
  • Deposit requests now include market question and expiry information for complete transaction context.
  • Position tracking migrated to real-time on-chain synchronization with automatic 15-second refresh cycles, replacing local storage.

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Project	Deployment	Review	Updated (UTC)
v0-skal-ventures-template-hm	Error		Jan 18, 2026 2:29am

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The changes extend the deposit flow to accept market question and expiry parameters, integrate on-chain Memo instruction storage for deposit context, and refactor position loading from localStorage to on-chain history fetching via transaction signature polling.

Changes

Cohort / File(s)	Change Summary
Deposit API Signature Extension hooks/use-deposit.ts	Updated deposit function and UseDepositReturn interface to accept marketQuestion (string) and expiry (number) parameters, forwarding them through to the transaction builder.
On-Chain Deposit Persistence lib/solana/deposit.ts	Introduced MEMO_PROGRAM_ID constant and extended DepositParams with marketQuestion and expiry fields. Added Memo instruction to deposit transactions to persist deposit context (marketId, question, position, amount, expiry, timestamp) on-chain.
Position Loading Refactoring hooks/use-positions.ts	Replaced localStorage-based position storage with on-chain history fetching: queries last 20 user signatures, parses transactions to extract Memo instruction data, reconstructs UserPosition entries from payloads, implements 15-second polling refresh cycle, and removes localStorage persistence from position additions.

Sequence Diagram(s)

sequenceDiagram
    actor User
    participant Hook as useDeposit Hook
    participant TxBuilder as Deposit TX Builder
    participant Solana as Solana Network
    participant Memo as Memo Program
    participant Token as Token Program

    User->>Hook: deposit(amount, marketId, marketQuestion, expiry, position)
    Hook->>TxBuilder: buildDepositTransaction(params with marketQuestion, expiry)
    TxBuilder->>TxBuilder: Create Memo instruction with deposit context
    TxBuilder->>Solana: Send transaction with Memo + Token instructions
    Solana->>Memo: Execute Memo instruction (store context)
    Solana->>Token: Execute USDC transfer
    Memo->>Solana: ✓ On-chain storage confirmed
    Token->>Solana: ✓ Transfer confirmed
    Solana->>Hook: Transaction signature
    Hook->>User: Return signature / success

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sequenceDiagram
    actor User
    participant Hook as usePositions Hook
    participant Wallet as Wallet Adapter
    participant RPC as Solana RPC
    participant Parser as Memo Parser

    User->>Hook: Load/Poll positions
    Hook->>Wallet: Get user public key
    Wallet->>Hook: Public key
    Hook->>RPC: Fetch last 20 signatures
    RPC->>Hook: Transaction signatures
    Hook->>RPC: Fetch parsed transactions
    RPC->>Hook: Transaction details with Memo instructions
    Hook->>Parser: Extract & parse Memo payloads
    Parser->>Hook: UserPosition objects
    Hook->>Hook: Update state & recalculate totals
    Hook->>User: Positions ready
    Note over Hook: Repeat poll every 15 seconds

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 From storage shelves we leap away,
With memos woven on-chain to stay,
Market questions dance with time,
Positions synced in rhythmic rhyme,
Fifteen seconds, polling sweet—
The chain and wallet waltz complete! ✨

✨ Finishing touches

• 📝 Generate docstrings

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