BREAKING CHANGE(core): Refactor to v3: introduce modular core/domain architecture, plugin system, observability and strict TypeScript configuration; remove legacy classes

readme.hints.md

@@ -1,3 +1,97 @@
 # Project Readme Hints
 
-This is the initial readme hints file.
+## v3.0 Transformation Progress
+
+### Completed Components
+
+**Phase 1: Foundation (100%)** - Complete
+- Error handling with typed hierarchy
+- Observability (logging, metrics, tracing)
+- Configuration management with fluent builder
+- Connection management with health checks and circuit breaker
+
+**Phase 2: Domain APIs (100%)** - Complete! 🎉
+- **Document API (100%)** - Complete fluent CRUD operations with sessions, iteration, snapshots
+- **Query Builder (100%)** - Type-safe query construction with aggregations
+- **Logging API (100%)** - Enterprise structured logging with:
+  - Batched bulk indexing with auto-flush
+  - Log enrichment pipeline (host, environment, service, sanitization)
+  - Sampling strategies (all, errors-only, percentage, rate-limit)
+  - ILM (Index Lifecycle Management) integration
+  - Metric extraction from logs
+  - Dynamic tagging based on content
+  - Queue overflow protection
+  - Example at `ts/examples/logging/logging-example.ts`
+- **Bulk Indexer (100%)** - High-throughput document ingestion with:
+  - Fixed, adaptive, and size-based batching strategies
+  - Parallel workers for concurrent processing
+  - Backpressure handling with queue management
+  - Dead-letter queue for failed operations
+  - Progress callbacks with ETA estimation
+  - Automatic retries with exponential backoff
+  - Mixed operations (index, update, delete)
+  - Comprehensive statistics tracking
+  - Example at `ts/examples/bulk/bulk-indexer-example.ts`
+- **KV Store (100%)** - Distributed key-value storage with:
+  - Time-to-live (TTL) support with automatic expiration
+  - In-memory caching layer with multiple eviction policies (LRU, LFU, FIFO, TTL)
+  - Batch operations (mget, mset, mdelete)
+  - Scan/cursor support for large keyspaces with wildcard patterns
+  - Automatic compression for large values
+  - Optimistic concurrency control
+  - Cache hit/miss statistics
+  - Example at `ts/examples/kv/kv-store-example.ts`
+
+**Phase 3: Advanced Features**
+- **Plugin Architecture (100%)** - Extensible request/response middleware:
+  - Plugin lifecycle hooks (beforeRequest, afterResponse, onError)
+  - Plugin priority and execution ordering
+  - Plugin statistics and monitoring
+  - Built-in plugins:
+    - Logging plugin - automatic request/response logging
+    - Metrics plugin - automatic metrics collection
+    - Cache plugin - response caching for GET requests
+    - Retry plugin - automatic retry with exponential backoff
+    - Rate limit plugin - token bucket rate limiting
+  - Custom plugin creation with factories
+  - Dynamic plugin registration/unregistration
+  - Shared context between plugins
+  - Timeout protection for plugin hooks
+  - Example at `ts/examples/plugins/plugin-example.ts`
+
+### Query Builder Usage
+
+```typescript
+import { createQuery } from './ts';
+
+// Simple query
+const results = await createQuery<Product>('products')
+  .match('name', 'laptop')
+  .range('price', { gte: 100, lte: 1000 })
+  .sort('price', 'asc')
+  .execute();
+
+// With aggregations
+const stats = await createQuery<Product>('products')
+  .matchAll()
+  .aggregations((agg) => {
+    agg.terms('brands', 'brand.keyword')
+      .subAggregation('avg_price', (sub) => sub.avg('avg_price', 'price'));
+  })
+  .execute();
+```
+
+### Next Priorities
+1. **Transaction Support** (Phase 3) - Distributed transactions across multiple documents
+2. **Schema Management** (Phase 3) - Index mapping management and migrations
+3. **Comprehensive Test Suite** (Phase 4) - Full test coverage
+4. **Migration Guide** (Phase 4) - Guide from v2 to v3
+
+### Structure
+- Single `ts/` directory (no parallel structures)
+- Single `tsconfig.json` with strict mode enabled
+- All v3.0 code lives in `ts/` directory
+
+### Known Issues
+- Minor TypeScript strict mode import issues documented in `ts/QUICK_FIXES.md`
+- Need to apply `import type` fixes for verbatimModuleSyntax compliance