advanced-agentdb-vector-search-implementation

What this skill does

# Advanced AgentDB Vector Search Implementation

## Overview

Master advanced AgentDB features including QUIC synchronization, multi-database management, custom distance metrics, hybrid search, and distributed systems integration for building distributed AI systems, multi-agent coordination, and advanced vector search applications.

## When to Use This Skill

Use this skill when you need to:
- Build distributed vector search systems
- Implement multi-agent coordination with shared memory
- Create custom similarity metrics for specialized domains
- Deploy hybrid search combining vector and traditional methods
- Scale AgentDB to production with high availability
- Synchronize multiple AgentDB instances in real-time

## SOP Framework: 5-Phase Advanced Vector Search Deployment

### Phase 1: Setup AgentDB Infrastructure (2-3 hours)

**Objective:** Initialize multi-database AgentDB infrastructure with proper configuration

**Agent:** backend-dev

**Steps:**

1. **Install AgentDB with advanced features**
```bash
npm install agentdb-advanced@latest
npm install @agentdb/quic-sync @agentdb/distributed
```

2. **Initialize primary database**
```typescript
import { AgentDB } from 'agentdb-advanced';
import { QUICSync } from '@agentdb/quic-sync';

const primaryDB = new AgentDB({
  name: 'primary-vector-db',
  dimensions: 1536, // OpenAI embedding size
  indexType: 'hnsw',
  distanceMetric: 'cosine',
  persistPath: './data/primary',
  advanced: {
    enableQUIC: true,
    multiDB: true,
    hybridSearch: true
  }
});

await primaryDB.initialize();
```

3. **Configure replica databases**
```typescript
const replicas = await Promise.all([
  AgentDB.createReplica('replica-1', {
    primary: primaryDB,
    syncMode: 'quic',
    persistPath: './data/replica-1'
  }),
  AgentDB.createReplica('replica-2', {
    primary: primaryDB,
    syncMode: 'quic',
    persistPath: './data/replica-2'
  })
]);
```

4. **Setup health monitoring**
```typescript
const monitor = primaryDB.createMonitor({
  checkInterval: 5000,
  metrics: ['latency', 'throughput', 'replication-lag'],
  alerts: {
    replicationLag: 1000, // ms
    errorRate: 0.01
  }
});

monitor.on('alert', (alert) => {
  console.error('Database alert:', alert);
});
```

**Memory Pattern:**
```typescript
await agentDB.memory.store('agentdb/infrastructure/config', {
  primary: primaryDB.id,
  replicas: replicas.map(r => r.id),
  syncMode: 'quic',
  timestamp: Date.now()
});
```

**Validation:**
- Primary database initialized
- Replicas connected and syncing
- Health monitor active
- Configuration stored in memory

**Evidence-Based Validation:**
```typescript
// Self-consistency check across replicas
const testVector = Array(1536).fill(0).map(() => Math.random());
await primaryDB.insert({ id: 'test-1', vector: testVector });

// Wait for sync
await new Promise(resolve => setTimeout(resolve, 100));

// Verify consistency
const checks = await Promise.all(
  replicas.map(r => r.get('test-1'))
);

const consistent = checks.every(c =>
  c && vectorEquals(c.vector, testVector)
);

console.log('Consistency check:', consistent ? 'PASS' : 'FAIL');
```

### Phase 2: Configure Advanced Features (2-3 hours)

**Objective:** Setup QUIC synchronization, multi-DB coordination, and advanced routing

**Agent:** ml-developer

**Steps:**

1. **Configure QUIC synchronization**
```typescript
import { QUICConfig } from '@agentdb/quic-sync';

const quicSync = new QUICSync({
  primary: primaryDB,
  replicas: replicas,
  config: {
    maxStreams: 100,
    idleTimeout: 30000,
    keepAlive: 5000,
    congestionControl: 'cubic',
    prioritization: 'weighted-round-robin'
  }
});

await quicSync.start();

// Monitor sync performance
quicSync.on('sync-complete', (stats) => {
  console.log('Sync stats:', {
    duration: stats.duration,
    vectorsSynced: stats.count,
    throughput: stats.count / (stats.duration / 1000)
  });
});
```

2. **Implement multi-database router**
```typescript
import { MultiDBRouter } from '@agentdb/distributed';

const router = new MultiDBRouter({
  databases: [primaryDB, ...replicas],
  strategy: 'load-balanced', // or 'nearest', 'round-robin'
  healthCheck: {
    interval: 5000,
    timeout: 1000
  }
});

// Query routing
const searchResults = await router.search({
  vector: queryVector,
  topK: 10,
  strategy: 'fan-out-merge' // Query all, merge results
});
```

3. **Setup distributed coordination**
```typescript
import { DistributedCoordinator } from '@agentdb/distributed';

const coordinator = new DistributedCoordinator({
  databases: [primaryDB, ...replicas],
  consensus: 'raft', // or 'gossip', 'quorum'
  leaderElection: true
});

await coordinator.start();

// Handle leadership changes
coordinator.on('leader-elected', (leader) => {
  console.log('New leader:', leader.id);
  primaryDB = leader;
});
```

4. **Configure failover policies**
```typescript
const failoverPolicy = {
  maxRetries: 3,
  retryDelay: 1000,
  fallbackStrategy: 'replica-promotion',
  autoRecovery: true
};

router.setFailoverPolicy(failoverPolicy);
```

**Memory Pattern:**
```typescript
await agentDB.memory.store('agentdb/advanced/quic-config', {
  syncMode: 'quic',
  streams: quicSync.activeStreams,
  routingStrategy: 'load-balanced',
  coordinator: coordinator.id
});
```

**Validation:**
- QUIC sync operational
- Router distributing load
- Coordinator elected leader
- Failover tested

**Evidence-Based Validation:**
```typescript
// Program-of-thought: Test multi-DB coordination
async function validateCoordination() {
  // Step 1: Insert on primary
  const testId = 'coord-test-' + Date.now();
  await primaryDB.insert({ id: testId, vector: testVector });

  // Step 2: Wait for QUIC sync
  await quicSync.waitForSync(testId, { timeout: 2000 });

  // Step 3: Query through router
  const results = await router.search({
    vector: testVector,
    topK: 1,
    filter: { id: testId }
  });

  // Step 4: Verify result from any replica
  return results[0]?.id === testId;
}

const coordValid = await validateCoordination();
console.log('Coordination validation:', coordValid ? 'PASS' : 'FAIL');
```

### Phase 3: Implement Custom Distance Metrics (2-3 hours)

**Objective:** Create specialized distance functions for domain-specific similarity

**Agent:** ml-developer

**Steps:**

1. **Define custom metric interface**
```typescript
import { DistanceMetric } from 'agentdb-advanced';

interface CustomMetricConfig {
  name: string;
  weightedDimensions?: number[];
  transformFunction?: (vector: number[]) => number[];
  combineMetrics?: {
    metrics: string[];
    weights: number[];
  };
}
```

2. **Implement weighted Euclidean distance**
```typescript
const weightedEuclidean: DistanceMetric = {
  name: 'weighted-euclidean',
  compute: (a: number[], b: number[], weights?: number[]) => {
    if (!weights) weights = Array(a.length).fill(1);

    let sum = 0;
    for (let i = 0; i < a.length; i++) {
      sum += weights[i] * Math.pow(a[i] - b[i], 2);
    }
    return Math.sqrt(sum);
  },
  normalize: true
};

primaryDB.registerMetric(weightedEuclidean);
```

3. **Create hybrid metric (vector + scalar)**
```typescript
const hybridSimilarity: DistanceMetric = {
  name: 'hybrid-similarity',
  compute: (a: number[], b: number[], metadata?: any) => {
    // Vector similarity (cosine)
    const dotProduct = a.reduce((sum, val, i) => sum + val * b[i], 0);
    const magA = Math.sqrt(a.reduce((sum, val) => sum + val * val, 0));
    const magB = Math.sqrt(b.reduce((sum, val) => sum + val * val, 0));
    const cosineSim = dotProduct / (magA * magB);

    // Scalar similarity (if metadata present)
    let scalarSim = 0;
    if (metadata) {
      scalarSim = 1 - Math.abs(metadata.timestamp - Date.now()) / 1e9;
    }

    // Combine (70% vector, 30% scalar)
    return 0.7 * (1 - cosineSim) + 0.3 * (1 - scalarSim);
  }
};

primaryDB.registerMetric(hybridSimilarity);
```

4. **Implement domain-specific metrics**
```typescript
// Example: Code similarity metric
const codeSimilarity: