# Phase 1 Implementation - Complete ✅

Phase 1 of the REFACTOR-PLAN.md has been successfully implemented and tested.

## What Was Implemented

### 1. Database Schema (Migration 004)
Created four new tables to support the SDK agent architecture:

- **`sdk_sessions`** - Tracks SDK streaming sessions
- **`observation_queue`** - Message queue for pending observations
- **`observations`** - Stores extracted observations from SDK
- **`session_summaries`** - Stores structured session summaries

All tables include proper indexes for performance and foreign key constraints for data integrity.

### 2. Shared Database Layer
Created `HooksDatabase` class ([src/services/sqlite/HooksDatabase.ts](src/services/sqlite/HooksDatabase.ts)) that provides:

- Simple, synchronous database operations for hooks
- No complex logic - just basic CRUD operations
- Optimized SQLite settings (WAL mode, foreign keys enabled)
- Methods for all hook operations:
  - `getRecentSummaries()` - Retrieve session context
  - `createSDKSession()` - Initialize new session
  - `queueObservation()` - Add observation to queue
  - `storeObservation()` - Save SDK observations
  - `storeSummary()` - Save session summaries
  - And more...

### 3. Hook Functions
Implemented all four hook functions in [src/hooks/](src/hooks/):

#### **context.ts** - SessionStart Hook
- Shows user recent session context on startup
- Formats summaries in markdown for Claude
- Exits silently if no context or errors occur

#### **save.ts** - PostToolUse Hook
- Queues tool observations for SDK processing
- Skips low-value tools (TodoWrite, ListMcpResourcesTool)
- Non-blocking - returns immediately

#### **new.ts** - UserPromptSubmit Hook
- Initializes SDK session in database
- Prepares for SDK worker spawn (TODO in Phase 2)
- Non-blocking - returns immediately

#### **summary.ts** - Stop Hook
- Queues FINALIZE message for SDK
- Signals SDK to generate session summary
- Non-blocking - returns immediately

### 4. CLI Integration
Added four new commands to [src/bin/cli.ts](src/bin/cli.ts:227-274):

```bash
claude-mem context   # SessionStart hook
claude-mem new       # UserPromptSubmit hook
claude-mem save      # PostToolUse hook
claude-mem summary   # Stop hook
```

All commands read JSON input from stdin and execute the corresponding hook function.

### 5. Testing
Created comprehensive test suite ([test-phase1.ts](test-phase1.ts)) that validates:

- ✅ Database schema migration 004 applied correctly
- ✅ All four tables exist
- ✅ SDK session creation and retrieval
- ✅ Observation queue operations
- ✅ Observation and summary storage
- ✅ Session status transitions

**All tests pass! 🎉**

## What's Left for Phase 2

The foundation is complete. Next steps:

1. **SDK Worker Process** - Implement the background agent that:
   - Polls observation queue
   - Sends observations to Claude SDK
   - Parses XML responses (`<observation>` and `<summary>` blocks)
   - Stores results in database

2. **SDK Prompts** - Implement the three prompt builders:
   - `buildInitPrompt()` - Initialize SDK agent
   - `buildObservationPrompt()` - Send tool observation
   - `buildFinalizePrompt()` - Request session summary

3. **Process Management** - Update [src/hooks/new.ts](src/hooks/new.ts:35-42) to spawn SDK worker as detached process

4. **End-to-End Testing** - Test with real Claude Code session

## File Changes

### New Files
- [src/services/sqlite/HooksDatabase.ts](src/services/sqlite/HooksDatabase.ts) - Shared database layer
- [src/hooks/context.ts](src/hooks/context.ts) - SessionStart hook
- [src/hooks/save.ts](src/hooks/save.ts) - PostToolUse hook
- [src/hooks/new.ts](src/hooks/new.ts) - UserPromptSubmit hook
- [src/hooks/summary.ts](src/hooks/summary.ts) - Stop hook
- [src/hooks/index.ts](src/hooks/index.ts) - Exports
- [test-phase1.ts](test-phase1.ts) - Test suite

### Modified Files
- [src/services/sqlite/migrations.ts](src/services/sqlite/migrations.ts:205-315) - Added migration 004
- [src/services/sqlite/index.ts](src/services/sqlite/index.ts:13) - Exported HooksDatabase
- [src/bin/cli.ts](src/bin/cli.ts:227-274) - Added hook commands

## Verification

To verify Phase 1 implementation:

```bash
# Build
bun run build

# Run tests
bun test-phase1.ts

# Check hook commands exist
./dist/claude-mem.min.js --help | grep -A 1 'context\|new\|save\|summary'
```

All should pass without errors.

## Next Steps

Ready to proceed to Phase 2: **SDK Worker Implementation**

The architecture is sound, the database layer is working, and all hook functions are ready to integrate with the SDK worker process.