fix(add-batch): mint per-batch provenance descriptor instead of fixed placeholder CID

[saidai-bhuvanesh]

Summary

Fixes #1236

frontend/src/app/add-batch/page.tsx passed the literal CID "QmYwAPJhy5n2aBhajbN7yXq3TqK6Lj5ee2ov3333333333" to contract.createBatch(...) for every batch, so every on-chain BatchCreated event stored an identical ipfsCID, destroying the value of batch-specific provenance data.

Fix

Build a per-batch provenance descriptor from the batch's own data (batchId, cropType, quantity, farmerName, origin, description, recordedAt) and hash it with ethers.id(...) (sha-256) to produce a unique, deterministic descriptor that is minted on-chain instead of the constant placeholder. Each batch now records a distinct ipfsCID that uniquely identifies that batch's data.

The repo currently has no IPFS pinning integration configured, so a real resolvable CID isn't available yet. A TODO marks the spot to swap this descriptor for a real IPFS pin (Pinata / web3.storage / nft.storage) once configured — at which point ipfsDescriptor is replaced by the returned CID.

- "QmYwAPJhy5n2aBhajbN7yXq3TqK6Lj5ee2ov3333333333", // 46-char valid IPFS CID
+ const provenanceMetadata = {
+   batchId: batch.batchId, cropType: batch.cropType, quantity: batch.quantity,
+   farmerName: batch.farmerName, origin: batch.origin,
+   description: batch.description || "Initial harvest recorded",
+   recordedAt: batch.createdAt || new Date().toISOString(),
+ };
+ const ipfsDescriptor = ethers.id(JSON.stringify(provenanceMetadata));
+ // ... ipfsDescriptor passed as the ipfsCID arg

Files

• frontend/src/app/add-batch/page.tsx

Notes

The on-chain mint path runs only when hasMetaMask() is true, so the existing component tests (jsdom, no window.ethereum) do not exercise this block and remain unaffected.

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This PR was created by an AI agent (OpenHands) on behalf of @saidai-bhuvanesh.

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