diff --git a/src/database/migrations/001_telemetry_query_indexes_rollback.sql b/src/database/migrations/001_telemetry_query_indexes_rollback.sql
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+Closes #347
+
+## Problem
+Analytical dashboard queries bog down when scanning unindexed columns 
+in large telemetry tables, especially for deep historical metrics.
+
+## Solution
+Added composite index migration files in `src/database/migrations/`:
+
+### Files added
+- `001_telemetry_query_indexes.sql` — 10 composite indexes across 6 tables
+- `001_telemetry_query_indexes_rollback.sql` — rollback script
+
+### Indexes added
+| Table | Index | Query accelerated |
+|---|---|---|
+| `PriceHistory` | `source, timestamp` | Provider history over time |
+| `PriceHistory` | `currency, source, timestamp` | Dashboard per-pair per-provider |
+| `OnChainPrice` | `currency, ledgerSeq` | Ledger history pagination |
+| `OnChainPrice` | `currency, confirmedAt` | Time-range dashboard queries |
+| `RawData` | `provider, currency, fetchedAt` | Validator/provider telemetry |
+| `OhlcCandle` | `currency, granularity, openTime` + INCLUDE | Sparkline charts |
+| `ErrorLog` | `providerName, occurredAt` | Recent errors per validator |
+| `ProviderReputation` | `status, reliabilityScore` | Validator ranking |
+| `ProviderReputation` | `providerName, lastUpdated` | Staleness monitoring |
+| `ComplianceMetadata` | `eventType, resolved, createdAt` | Latency violation dashboard |
+
+All indexes use `CONCURRENTLY` to avoid table locks in production.
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