[Docs] Add an indexer/realtime operational runbook (replay/reset/status, lag thresholds, RPC-outage recovery)

[grantfox-oss]

Telegram (ask questions / claim the issue here first): https://t.me/+DOylgFv1jyJlNzM0

Labels: documentation, Stellar Wave, devops, docs

We have plenty of docs under docs/ (SSE architecture, implementation, auth, versioning) but nothing that tells on-call how to actually operate the indexer.

If the Soroban RPC goes down or we miss a batch of ledgers, there's no runbook for recovering. The admin reset/replay endpoints, what indexer lag actually means, and the indexer env vars (INDEXER_POLL_INTERVAL_MS, INDEXER_START_LEDGER, STREAM_CONTRACT_ID) are all undocumented on the ops side. So whoever gets paged is guessing.

What the doc has to cover

• Reading indexer lag from /health and /v1/admin/metrics, and what the thresholds mean
• Reset vs replay: what each does, when to reach for it, and the fact that replay is safe to re-run because the dedup constraint makes it idempotent
• The INDEXER_* vars plus SOROBAN_RPC_URL and STREAM_CONTRACT_ID, and what happens when the indexer is disabled

Done when

• Lag reading + thresholds documented
• Reset/replay endpoints documented, including the idempotency note
• Env vars and disabled-indexer behavior documented

Where to start
Add this to backend/docs/SSE_ARCHITECTURE.md and backend/SSE_README.md. Don't re-document the on-chain data flow that's already in ARCHITECTURE.md. Pure docs, no code changes.

[habnark]

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Next steps:

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