[Bug] Indexer race condition — 502 on receipt fetch after tx confirms

[realproject7]

Description

/api/index/donation (and likely other indexer routes) returns 502 when called immediately after waitForTransactionReceipt completes. The RPC node doesn't have the receipt available on the next call (likely load-balanced to a different node).

Steps to reproduce

1. Donate to a story
2. Tx confirms on-chain
3. Indexer is called immediately → 502 ("Failed to fetch transaction receipt")
4. Manual retry later succeeds

Terminal logs

POST /api/index/donation 502 in 643ms
POST /api/index/donation 400 in 201ms

Affected routes

• src/app/api/index/donation/route.ts (line 32-34)
• Check src/app/api/index/storyline/route.ts and src/app/api/index/plot/route.ts for same pattern

Fix

Add a retry with short delay (e.g., 2-3 attempts with 1s backoff) when getTransactionReceipt fails, before returning 502.

🤖 Generated with Claude Code

[realproject7]

Additional finding from QA-4: Multiple donations were made on-chain but only 1 appears in the reader dashboard — the others failed indexing (502). This confirms the race condition affects real usage, not just edge cases.

Also: donation history shows "$PLOT" instead of "WETH" on testnet. The RESERVE_LABEL constant should be used here too.