Create kind-jars-lay.md

Author: steida

.changeset/kind-jars-lay.md

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+---
+"@evolu/common": patch
+---
+
+Add owner usage tracking and storage improvements
+
+### Breaking Changes
+
+- Renamed `TransportConfig` to `OwnerTransport` and `WebSocketTransportConfig` to `OwnerWebSocketTransport` for clearer naming
+- Renamed `SqliteStorageBase` to `BaseSqliteStorage` and `createSqliteStorageBase` to `createBaseSqliteStorage`
+- Extracted storage table creation into separate functions: `createBaseSqliteStorageTables` and `createRelayStorageTables` to support serverless deployments where table setup must be separate from storage operations
+
+### Features
+
+- **Owner usage tracking** (in progress): Added `evolu_usage` table and `OwnerUsage` interface to track data consumption metrics per owner (stored bytes, received bytes, sent bytes, first/last timestamps). Table structure is in place but not yet fully implemented
+- **Identicon generation**: Added `createIdenticon` function that generates deterministic SVG identicons from any `Id`. Supports four styles: `"github"` (5x5 mirrored grid), `"quadrant"` (2x2 color blocks), `"gradient"` (diagonal stripes), and `"sutnar"` (compositional variants)
+- **Timestamp privacy documentation**: Added comprehensive privacy considerations explaining that timestamps are metadata visible to relays, with guidance on implementing local write queues for maximum privacy
+
+### Performance
+
+- **isSqlMutation optimization**: Added LRU cache (10,000 entries) to `isSqlMutation` function, restoring performance from 34k to 57k inserts/sec. Cache stores results of SQL mutation detection to avoid repeated comment removal and regex matching