Implement event replay and indexer reset endpoints

[ogazboiz]

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Description

When the indexer goes down for maintenance or encounters a bug, there is no way to re-process missed events without restarting from scratch. An admin replay endpoint is needed for recovery.

What Needs to Happen

• POST /v1/admin/indexer/replay?from_ledger=X — reprocess all contract events from ledger X
• POST /v1/admin/indexer/reset — reset IndexerState.lastProcessedLedger to a given value
• GET /v1/admin/indexer/status — show last ledger, events processed, current lag
• All endpoints require admin JWT
• Replay is idempotent (deduplicated by txHash)

Files

• backend/src/routes/adminRoutes.ts (create)
• backend/src/services/indexerService.ts

Acceptance Criteria

• Replay re-processes events without duplicates
• Status endpoint shows real lag
• Reset requires admin auth

[shakurJJ]

@shakurJJ has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I would like to work on this issue

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This issue has been completed by @shakurJJ as part of the Stellar Wave Program's 4th Wave 🥳

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