Technical
Data & Knowledge Layer
Knowledge Capsule System
Knowledge Marketplace

Knowledge Marketplace

The AIMatrix Knowledge Marketplace is a comprehensive ecosystem for discovering, evaluating, and acquiring specialized knowledge capsules. It serves as the central hub connecting knowledge creators with organizations seeking domain expertise.

Marketplace Architecture

Platform Overview 

  graph TB
    subgraph "Frontend Layer"
        WEB[Web Portal]
        CLI[CLI Interface]
        API_CLIENT[API Clients]
    end
    
    subgraph "API Gateway"
        GATEWAY[Load Balancer & Auth]
        RATE_LIMIT[Rate Limiting]
        CACHE[Response Cache]
    end
    
    subgraph "Core Services"
        CATALOG[Catalog Service]
        SEARCH[Search & Discovery]
        REVIEW[Review System]
        LICENSE[License Manager]
        BILLING[Billing Service]
        ANALYTICS[Analytics Engine]
    end
    
    subgraph "Data Layer"
        POSTGRES[(PostgreSQL)]
        ELASTIC[(Elasticsearch)]
        REDIS[(Redis Cache)]
        S3[(Asset Storage)]
    end
    
    subgraph "External Integrations"
        PAYMENT[Payment Providers]
        SECURITY[Security Scanners]
        QUALITY[Quality Assurance]
    end
    
    WEB --> GATEWAY
    CLI --> GATEWAY
    API_CLIENT --> GATEWAY
    
    GATEWAY --> RATE_LIMIT
    RATE_LIMIT --> CACHE
    CACHE --> CATALOG
    CACHE --> SEARCH
    CACHE --> REVIEW
    
    CATALOG --> POSTGRES
    SEARCH --> ELASTIC
    REVIEW --> POSTGRES
    LICENSE --> POSTGRES
    BILLING --> POSTGRES
    
    CATALOG --> S3
    SEARCH --> REDIS
    
    BILLING --> PAYMENT
    CATALOG --> SECURITY
    CATALOG --> QUALITY

Database Schema 

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-- Publishers (developers/organizations)
CREATE TABLE publishers (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name TEXT NOT NULL,
    email TEXT UNIQUE NOT NULL,
    organization TEXT,
    website TEXT,
    verified BOOLEAN DEFAULT FALSE,
    reputation_score DECIMAL(3,2) DEFAULT 0.0,
    total_downloads BIGINT DEFAULT 0,
    active_capsules INTEGER DEFAULT 0,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Marketplace capsule listings
CREATE TABLE marketplace_capsules (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    capsule_id UUID NOT NULL, -- References knowledge_capsules.id
    publisher_id UUID REFERENCES publishers(id),
    
    -- Marketplace metadata
    featured BOOLEAN DEFAULT FALSE,
    visibility marketplace_visibility DEFAULT 'public',
    status listing_status DEFAULT 'active',
    
    -- Pricing and licensing
    license_type license_type NOT NULL,
    pricing_model pricing_model NOT NULL,
    price_data JSONB DEFAULT '{}',
    
    -- Discovery metadata
    category TEXT NOT NULL,
    subcategory TEXT,
    tags TEXT[],
    keywords TEXT[],
    
    -- Statistics
    download_count BIGINT DEFAULT 0,
    install_count BIGINT DEFAULT 0,
    active_installations BIGINT DEFAULT 0,
    
    -- Ratings
    rating_average DECIMAL(2,1) DEFAULT 0.0,
    rating_count INTEGER DEFAULT 0,
    rating_distribution JSONB DEFAULT '{}',
    
    -- Marketplace specific timestamps
    published_at TIMESTAMP WITH TIME ZONE,
    last_updated TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    featured_until TIMESTAMP WITH TIME ZONE,
    
    UNIQUE(capsule_id),
    CHECK (rating_average >= 0.0 AND rating_average <= 5.0),
    CHECK (visibility IN ('public', 'private', 'organization'))
);

-- Custom types
CREATE TYPE marketplace_visibility AS ENUM ('public', 'private', 'organization');
CREATE TYPE listing_status AS ENUM ('active', 'inactive', 'suspended', 'pending_review');
CREATE TYPE license_type AS ENUM ('mit', 'apache', 'proprietary', 'commercial', 'custom');
CREATE TYPE pricing_model AS ENUM ('free', 'freemium', 'subscription', 'usage_based', 'enterprise');

-- Reviews and ratings
CREATE TABLE capsule_reviews (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    capsule_id UUID REFERENCES marketplace_capsules(capsule_id),
    organization_id UUID REFERENCES organizations(id),
    reviewer_id UUID NOT NULL,
    
    -- Review content
    rating INTEGER NOT NULL CHECK (rating >= 1 AND rating <= 5),
    title TEXT,
    review_text TEXT,
    pros TEXT[],
    cons TEXT[],
    
    -- Review metadata
    helpful_votes INTEGER DEFAULT 0,
    verified_purchase BOOLEAN DEFAULT FALSE,
    version_reviewed TEXT,
    usage_duration TEXT, -- e.g., '3 months', '1 year'
    
    -- Moderation
    status review_status DEFAULT 'published',
    moderation_notes TEXT,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    
    UNIQUE(capsule_id, organization_id, reviewer_id)
);

CREATE TYPE review_status AS ENUM ('published', 'pending', 'rejected', 'flagged');

-- Review responses (publisher responses to reviews)
CREATE TABLE review_responses (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    review_id UUID REFERENCES capsule_reviews(id),
    publisher_id UUID REFERENCES publishers(id),
    response_text TEXT NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Categories and taxonomy
CREATE TABLE marketplace_categories (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name TEXT UNIQUE NOT NULL,
    slug TEXT UNIQUE NOT NULL,
    description TEXT,
    parent_id UUID REFERENCES marketplace_categories(id),
    icon TEXT,
    sort_order INTEGER DEFAULT 0,
    active BOOLEAN DEFAULT TRUE
);

-- Licensing and usage tracking
CREATE TABLE license_agreements (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    capsule_id UUID REFERENCES marketplace_capsules(capsule_id),
    organization_id UUID REFERENCES organizations(id),
    
    license_type TEXT NOT NULL,
    agreement_version TEXT NOT NULL,
    terms_accepted_at TIMESTAMP WITH TIME ZONE NOT NULL,
    accepted_by UUID NOT NULL,
    
    -- License limits and usage
    usage_limits JSONB DEFAULT '{}',
    current_usage JSONB DEFAULT '{}',
    
    valid_from TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    valid_until TIMESTAMP WITH TIME ZONE,
    
    status license_status DEFAULT 'active',
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE TYPE license_status AS ENUM ('active', 'expired', 'suspended', 'terminated');

-- Usage tracking for billing
CREATE TABLE usage_records (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    license_id UUID REFERENCES license_agreements(id),
    
    usage_type TEXT NOT NULL, -- 'api_calls', 'data_processed', 'storage', etc.
    quantity DECIMAL NOT NULL,
    unit TEXT NOT NULL,
    unit_price DECIMAL,
    
    recorded_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    billing_period TEXT, -- 'YYYY-MM' format
    
    -- Metadata
    metadata JSONB DEFAULT '{}'
);

-- Revenue tracking
CREATE TABLE revenue_records (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    capsule_id UUID REFERENCES marketplace_capsules(capsule_id),
    publisher_id UUID REFERENCES publishers(id),
    organization_id UUID REFERENCES organizations(id),
    
    revenue_type revenue_type NOT NULL,
    gross_amount DECIMAL(10,2) NOT NULL,
    platform_fee DECIMAL(10,2) NOT NULL,
    net_amount DECIMAL(10,2) NOT NULL,
    currency TEXT DEFAULT 'USD',
    
    billing_period TEXT, -- 'YYYY-MM' format
    transaction_id TEXT,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE TYPE revenue_type AS ENUM ('subscription', 'usage', 'one_time', 'commission');

-- Create indexes for performance
CREATE INDEX idx_marketplace_capsules_category ON marketplace_capsules(category);
CREATE INDEX idx_marketplace_capsules_featured ON marketplace_capsules(featured, published_at DESC);
CREATE INDEX idx_marketplace_capsules_rating ON marketplace_capsules(rating_average DESC, rating_count DESC);
CREATE INDEX idx_marketplace_capsules_downloads ON marketplace_capsules(download_count DESC);
CREATE INDEX idx_marketplace_capsules_tags ON marketplace_capsules USING GIN(tags);
CREATE INDEX idx_capsule_reviews_rating ON capsule_reviews(capsule_id, rating DESC);
CREATE INDEX idx_usage_records_billing ON usage_records(license_id, billing_period);

Discovery and Search

Advanced Search Engine

The marketplace implements a sophisticated search system using Elasticsearch:

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class MarketplaceSearchEngine {
  private elasticsearch: Client;
  private redis: Redis;
  
  constructor(config: SearchConfig) {
    this.elasticsearch = new Client({ node: config.elasticsearchUrl });
    this.redis = new Redis(config.redisUrl);
  }
  
  async searchCapsules(query: SearchQuery): Promise<SearchResults> {
    const cacheKey = this.generateCacheKey(query);
    
    // Check cache first
    const cached = await this.redis.get(cacheKey);
    if (cached && !query.bypassCache) {
      return JSON.parse(cached);
    }
    
    // Build Elasticsearch query
    const esQuery = this.buildElasticsearchQuery(query);
    
    // Execute search
    const searchResponse = await this.elasticsearch.search({
      index: 'marketplace_capsules',
      body: esQuery
    });
    
    // Process results
    const results = this.processSearchResults(searchResponse, query);
    
    // Cache results
    await this.redis.setex(cacheKey, 300, JSON.stringify(results)); // 5 min cache
    
    return results;
  }
  
  private buildElasticsearchQuery(query: SearchQuery): any {
    const must: any[] = [];
    const filter: any[] = [];
    const should: any[] = [];
    
    // Text search
    if (query.text) {
      must.push({
        multi_match: {
          query: query.text,
          fields: [
            'name^3',           // Boost name matches
            'description^2',    // Boost description matches
            'tags^2',          // Boost tag matches
            'keywords^1.5',    // Boost keyword matches
            'category',
            'publisher_name'
          ],
          type: 'best_fields',
          fuzziness: 'AUTO'
        }
      });
      
      // Add semantic search using vector similarity
      const embedding = await this.generateQueryEmbedding(query.text);
      should.push({
        script_score: {
          query: { match_all: {} },
          script: {
            source: "cosineSimilarity(params.query_vector, 'description_embedding') + 1.0",
            params: { query_vector: embedding }
          },
          boost: 0.3
        }
      });
    }
    
    // Category filter
    if (query.categories?.length > 0) {
      filter.push({
        terms: { category: query.categories }
      });
    }
    
    // Rating filter
    if (query.minRating) {
      filter.push({
        range: { rating_average: { gte: query.minRating } }
      });
    }
    
    // Price filter
    if (query.pricingModels?.length > 0) {
      filter.push({
        terms: { pricing_model: query.pricingModels }
      });
    }
    
    // License filter
    if (query.licenseTypes?.length > 0) {
      filter.push({
        terms: { license_type: query.licenseTypes }
      });
    }
    
    // Popularity boost
    should.push({
      function_score: {
        query: { match_all: {} },
        script_score: {
          script: {
            source: "Math.log(2.0 + doc['download_count'].value)"
          }
        },
        boost_mode: 'multiply',
        boost: 0.1
      }
    });
    
    // Recency boost
    should.push({
      function_score: {
        query: { match_all: {} },
        gauss: {
          published_at: {
            origin: 'now',
            scale: '30d',
            decay: 0.5
          }
        },
        boost: 0.2
      }
    });
    
    // Build aggregations for facets
    const aggregations = {
      categories: {
        terms: { field: 'category', size: 20 }
      },
      pricing_models: {
        terms: { field: 'pricing_model', size: 10 }
      },
      license_types: {
        terms: { field: 'license_type', size: 10 }
      },
      rating_distribution: {
        histogram: {
          field: 'rating_average',
          interval: 1,
          min_doc_count: 1
        }
      }
    };
    
    return {
      query: {
        bool: {
          must,
          filter,
          should,
          minimum_should_match: should.length > 0 ? 1 : 0
        }
      },
      sort: this.buildSortCriteria(query.sortBy, query.sortOrder),
      aggregations,
      from: (query.page - 1) * query.size,
      size: query.size,
      highlight: {
        fields: {
          name: {},
          description: {},
          tags: {}
        }
      }
    };
  }
  
  private buildSortCriteria(sortBy?: string, sortOrder = 'desc'): any[] {
    const sortCriteria = [];
    
    switch (sortBy) {
      case 'relevance':
        sortCriteria.push({ _score: { order: sortOrder } });
        break;
      case 'rating':
        sortCriteria.push(
          { rating_average: { order: sortOrder } },
          { rating_count: { order: sortOrder } }
        );
        break;
      case 'downloads':
        sortCriteria.push({ download_count: { order: sortOrder } });
        break;
      case 'newest':
        sortCriteria.push({ published_at: { order: sortOrder } });
        break;
      case 'updated':
        sortCriteria.push({ last_updated: { order: sortOrder } });
        break;
      case 'name':
        sortCriteria.push({ 'name.keyword': { order: sortOrder } });
        break;
      default:
        // Default relevance sort with popularity boost
        sortCriteria.push(
          { _score: { order: 'desc' } },
          { download_count: { order: 'desc' } }
        );
    }
    
    return sortCriteria;
  }
}

Recommendation Engine 

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class RecommendationEngine {
  async getRecommendations(
    organizationId: string,
    context: RecommendationContext
  ): Promise<Recommendation[]> {
    
    const recommendations: Recommendation[] = [];
    
    // 1. Collaborative filtering - based on similar organizations
    const collaborativeRecs = await this.getCollaborativeRecommendations(
      organizationId,
      context
    );
    recommendations.push(...collaborativeRecs);
    
    // 2. Content-based filtering - based on current capsules
    const contentRecs = await this.getContentBasedRecommendations(
      organizationId,
      context
    );
    recommendations.push(...contentRecs);
    
    // 3. Knowledge gap analysis
    const gapRecs = await this.getKnowledgeGapRecommendations(
      organizationId,
      context
    );
    recommendations.push(...gapRecs);
    
    // 4. Trending capsules
    const trendingRecs = await this.getTrendingRecommendations(context);
    recommendations.push(...trendingRecs);
    
    // 5. Publisher recommendations
    const publisherRecs = await this.getPublisherRecommendations(
      organizationId,
      context
    );
    recommendations.push(...publisherRecs);
    
    // Deduplicate and rank
    const uniqueRecs = this.deduplicateRecommendations(recommendations);
    const rankedRecs = await this.rankRecommendations(uniqueRecs, context);
    
    return rankedRecs.slice(0, context.limit || 20);
  }
  
  private async getCollaborativeRecommendations(
    organizationId: string,
    context: RecommendationContext
  ): Promise<Recommendation[]> {
    
    // Find similar organizations based on installed capsules
    const similarOrgs = await this.findSimilarOrganizations(organizationId);
    
    const recommendations: Recommendation[] = [];
    
    for (const similarOrg of similarOrgs) {
      // Get capsules installed by similar orgs that current org doesn't have
      const theirCapsules = await this.getOrganizationCapsules(similarOrg.id);
      const ourCapsules = await this.getOrganizationCapsules(organizationId);
      
      const ourCapsuleIds = new Set(ourCapsules.map(c => c.capsule_id));
      
      for (const capsule of theirCapsules) {
        if (!ourCapsuleIds.has(capsule.capsule_id)) {
          recommendations.push({
            capsuleId: capsule.capsule_id,
            type: 'collaborative',
            score: similarOrg.similarity * capsule.rating_average,
            reason: `Organizations similar to yours also use this capsule`,
            metadata: {
              similarity: similarOrg.similarity,
              similar_org_count: 1
            }
          });
        }
      }
    }
    
    return recommendations;
  }
  
  private async getKnowledgeGapRecommendations(
    organizationId: string,
    context: RecommendationContext
  ): Promise<Recommendation[]> {
    
    // Analyze organization's knowledge usage patterns
    const usageAnalysis = await this.analyzeKnowledgeUsage(organizationId);
    
    // Identify knowledge gaps - areas with high query volume but low success rates
    const knowledgeGaps = usageAnalysis.gaps.filter(gap => 
      gap.queryVolume > 100 && gap.successRate < 0.7
    );
    
    const recommendations: Recommendation[] = [];
    
    for (const gap of knowledgeGaps) {
      // Find capsules that could fill this knowledge gap
      const matchingCapsules = await this.findCapsulesForKnowledgeArea(gap.domain);
      
      for (const capsule of matchingCapsules) {
        recommendations.push({
          capsuleId: capsule.capsule_id,
          type: 'knowledge_gap',
          score: gap.urgency * capsule.rating_average,
          reason: `Could help improve success rate for ${gap.domain} queries`,
          metadata: {
            knowledge_domain: gap.domain,
            current_success_rate: gap.successRate,
            query_volume: gap.queryVolume
          }
        });
      }
    }
    
    return recommendations;
  }
}

Rating and Review System

Review Management 

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class ReviewSystem {
  async submitReview(review: ReviewSubmission): Promise<ReviewResult> {
    // Validate review
    const validation = await this.validateReview(review);
    if (!validation.valid) {
      throw new Error(`Invalid review: ${validation.errors.join(', ')}`);
    }
    
    // Check for existing review
    const existing = await this.getExistingReview(
      review.capsuleId,
      review.organizationId,
      review.reviewerId
    );
    
    if (existing) {
      throw new Error('Review already exists. Use update instead.');
    }
    
    // Verify purchase/usage
    const verifiedPurchase = await this.verifyPurchase(
      review.capsuleId,
      review.organizationId
    );
    
    // Content moderation
    const moderationResult = await this.moderateReviewContent(review);
    
    const reviewRecord: ReviewRecord = {
      id: uuid(),
      capsule_id: review.capsuleId,
      organization_id: review.organizationId,
      reviewer_id: review.reviewerId,
      rating: review.rating,
      title: review.title,
      review_text: review.reviewText,
      pros: review.pros || [],
      cons: review.cons || [],
      verified_purchase: verifiedPurchase,
      version_reviewed: review.versionReviewed,
      usage_duration: review.usageDuration,
      status: moderationResult.autoApprove ? 'published' : 'pending',
      created_at: new Date()
    };
    
    // Save review
    await this.saveReview(reviewRecord);
    
    // Update capsule rating statistics
    await this.updateCapsuleRatingStats(review.capsuleId);
    
    // Notify publisher if published
    if (reviewRecord.status === 'published') {
      await this.notifyPublisher(reviewRecord);
    }
    
    return {
      reviewId: reviewRecord.id,
      status: reviewRecord.status,
      estimatedApprovalTime: moderationResult.autoApprove ? null : '24-48 hours'
    };
  }
  
  private async moderateReviewContent(review: ReviewSubmission): Promise<ModerationResult> {
    const moderationChecks: ModerationCheck[] = [
      // Content quality check
      {
        name: 'content_quality',
        check: async () => {
          const wordCount = review.reviewText?.split(' ').length || 0;
          return {
            passed: wordCount >= 10, // Minimum 10 words
            score: Math.min(wordCount / 50, 1), // Normalize to 0-1
            reason: wordCount < 10 ? 'Review too short' : null
          };
        }
      },
      
      // Spam detection
      {
        name: 'spam_detection',
        check: async () => {
          const spamScore = await this.calculateSpamScore(review);
          return {
            passed: spamScore < 0.7,
            score: 1 - spamScore,
            reason: spamScore >= 0.7 ? 'Potential spam detected' : null
          };
        }
      },
      
      // Toxicity check
      {
        name: 'toxicity_check',
        check: async () => {
          const toxicityScore = await this.analyzeToxicity(review.reviewText);
          return {
            passed: toxicityScore < 0.5,
            score: 1 - toxicityScore,
            reason: toxicityScore >= 0.5 ? 'Inappropriate content detected' : null
          };
        }
      },
      
      // Authenticity check
      {
        name: 'authenticity_check',
        check: async () => {
          const authenticityScore = await this.checkAuthenticity(review);
          return {
            passed: authenticityScore > 0.6,
            score: authenticityScore,
            reason: authenticityScore <= 0.6 ? 'Review authenticity questionable' : null
          };
        }
      }
    ];
    
    const results: ModerationCheckResult[] = [];
    let overallScore = 0;
    let failedChecks = 0;
    
    for (const check of moderationChecks) {
      const result = await check.check();
      results.push({
        checkName: check.name,
        ...result
      });
      
      overallScore += result.score;
      if (!result.passed) failedChecks++;
    }
    
    const averageScore = overallScore / moderationChecks.length;
    
    return {
      autoApprove: failedChecks === 0 && averageScore >= 0.8,
      overallScore: averageScore,
      checkResults: results,
      flaggedReasons: results.filter(r => !r.passed).map(r => r.reason).filter(Boolean)
    };
  }
  
  async updateCapsuleRatingStats(capsuleId: string): Promise<void> {
    const reviews = await this.getCapsuleReviews(capsuleId, { status: 'published' });
    
    const ratingCounts = [0, 0, 0, 0, 0]; // Index 0 = 1-star, etc.
    let totalRating = 0;
    
    for (const review of reviews) {
      ratingCounts[review.rating - 1]++;
      totalRating += review.rating;
    }
    
    const ratingAverage = reviews.length > 0 ? totalRating / reviews.length : 0;
    const ratingDistribution = {
      1: ratingCounts[0],
      2: ratingCounts[1],
      3: ratingCounts[2],
      4: ratingCounts[3],
      5: ratingCounts[4]
    };
    
    await this.updateCapsuleStats(capsuleId, {
      rating_average: Math.round(ratingAverage * 10) / 10, // Round to 1 decimal
      rating_count: reviews.length,
      rating_distribution: ratingDistribution
    });
  }
  
  async getReviewInsights(capsuleId: string): Promise<ReviewInsights> {
    const reviews = await this.getCapsuleReviews(capsuleId, { status: 'published' });
    
    const insights: ReviewInsights = {
      summary: {
        totalReviews: reviews.length,
        averageRating: 0,
        ratingDistribution: { 1: 0, 2: 0, 3: 0, 4: 0, 5: 0 },
        verifiedPurchaseRate: 0
      },
      sentiment: await this.analyzeSentiment(reviews),
      commonTopics: await this.extractCommonTopics(reviews),
      timelineAnalysis: await this.analyzeReviewTimeline(reviews),
      competitorComparison: await this.compareWithCompetitors(capsuleId)
    };
    
    return insights;
  }
}

Review Analytics 

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class ReviewAnalytics {
  async generateReviewReport(
    capsuleId: string,
    timeframe: TimeFrame
  ): Promise<ReviewAnalyticsReport> {
    
    const reviews = await this.getReviewsInTimeframe(capsuleId, timeframe);
    
    return {
      period: timeframe,
      metrics: {
        totalReviews: reviews.length,
        averageRating: this.calculateAverageRating(reviews),
        ratingTrend: await this.calculateRatingTrend(capsuleId, timeframe),
        sentimentScore: await this.calculateSentimentScore(reviews),
        responseRate: await this.calculateResponseRate(capsuleId, timeframe),
        helpfulnessScore: this.calculateHelpfulnessScore(reviews)
      },
      breakdowns: {
        ratingDistribution: this.getRatingDistribution(reviews),
        sentimentDistribution: await this.getSentimentDistribution(reviews),
        verificationBreakdown: this.getVerificationBreakdown(reviews),
        lengthDistribution: this.getReviewLengthDistribution(reviews)
      },
      insights: {
        topPraises: await this.extractTopPraises(reviews),
        topComplaints: await this.extractTopComplaints(reviews),
        emergingThemes: await this.identifyEmergingThemes(reviews),
        recommendations: await this.generateRecommendations(reviews)
      }
    };
  }
  
  private async extractTopPraises(reviews: Review[]): Promise<TopicInsight[]> {
    const positiveReviews = reviews.filter(r => r.rating >= 4);
    const praises: string[] = [];
    
    for (const review of positiveReviews) {
      praises.push(review.review_text);
      praises.push(...(review.pros || []));
    }
    
    const topics = await this.extractTopics(praises.join(' '), {
      sentiment: 'positive',
      maxTopics: 10
    });
    
    return topics.map(topic => ({
      topic: topic.name,
      frequency: topic.frequency,
      sentiment: topic.sentiment,
      examples: topic.examples
    }));
  }
  
  private async identifyEmergingThemes(reviews: Review[]): Promise<EmergingTheme[]> {
    // Analyze recent reviews for new themes
    const recentReviews = reviews
      .filter(r => r.created_at > new Date(Date.now() - 30 * 24 * 60 * 60 * 1000))
      .sort((a, b) => b.created_at.getTime() - a.created_at.getTime());
    
    const themes: EmergingTheme[] = [];
    
    if (recentReviews.length >= 5) {
      const recentTopics = await this.extractTopics(
        recentReviews.map(r => r.review_text).join(' ')
      );
      
      const historicalTopics = await this.getHistoricalTopics(reviews);
      
      for (const topic of recentTopics) {
        const historicalMatch = historicalTopics.find(h => 
          this.calculateTopicSimilarity(topic.name, h.name) > 0.8
        );
        
        if (!historicalMatch || topic.frequency > historicalMatch.frequency * 2) {
          themes.push({
            theme: topic.name,
            frequency: topic.frequency,
            growthRate: historicalMatch 
              ? (topic.frequency - historicalMatch.frequency) / historicalMatch.frequency
              : 1, // New theme
            firstSeen: recentReviews[recentReviews.length - 1].created_at,
            sentiment: topic.sentiment
          });
        }
      }
    }
    
    return themes.sort((a, b) => b.growthRate - a.growthRate);
  }
}

License Management

Licensing Framework 

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class LicenseManager {
  async createLicenseAgreement(
    capsuleId: string,
    organizationId: string,
    licenseType: string,
    customTerms?: CustomLicenseTerms
  ): Promise<LicenseAgreement> {
    
    // Get capsule licensing information
    const capsule = await this.getMarketplaceCapsule(capsuleId);
    if (!capsule) {
      throw new Error('Capsule not found');
    }
    
    // Generate license agreement
    const agreement = await this.generateLicenseAgreement({
      capsuleId,
      organizationId,
      licenseType,
      customTerms,
      capsuleInfo: capsule
    });
    
    // Store agreement
    const licenseAgreement: LicenseAgreement = {
      id: uuid(),
      capsule_id: capsuleId,
      organization_id: organizationId,
      license_type: licenseType,
      agreement_version: agreement.version,
      terms_accepted_at: new Date(),
      accepted_by: this.getCurrentUserId(),
      usage_limits: agreement.usageLimits,
      valid_from: new Date(),
      valid_until: agreement.validUntil,
      status: 'active'
    };
    
    await this.storeLicenseAgreement(licenseAgreement);
    
    // Set up usage tracking
    await this.setupUsageTracking(licenseAgreement);
    
    return licenseAgreement;
  }
  
  async trackUsage(
    licenseId: string,
    usageType: string,
    quantity: number,
    metadata?: Record<string, any>
  ): Promise<UsageRecord> {
    
    const license = await this.getLicenseAgreement(licenseId);
    if (!license || license.status !== 'active') {
      throw new Error('Invalid or inactive license');
    }
    
    // Check usage limits
    const currentUsage = await this.getCurrentUsage(licenseId);
    const limit = license.usage_limits[usageType];
    
    if (limit && currentUsage[usageType] + quantity > limit) {
      throw new Error(`Usage limit exceeded for ${usageType}`);
    }
    
    // Calculate pricing
    const pricing = await this.calculateUsagePricing(license, usageType, quantity);
    
    // Record usage
    const usageRecord: UsageRecord = {
      id: uuid(),
      license_id: licenseId,
      usage_type: usageType,
      quantity,
      unit: this.getUsageUnit(usageType),
      unit_price: pricing.unitPrice,
      recorded_at: new Date(),
      billing_period: this.getCurrentBillingPeriod(),
      metadata: metadata || {}
    };
    
    await this.storeUsageRecord(usageRecord);
    
    // Update current usage cache
    await this.updateUsageCache(licenseId, usageType, quantity);
    
    // Check for usage alerts
    await this.checkUsageAlerts(license, currentUsage, usageType, quantity);
    
    return usageRecord;
  }
  
  async validateLicense(
    capsuleId: string,
    organizationId: string,
    requestedOperation: string
  ): Promise<LicenseValidationResult> {
    
    const license = await this.getActiveLicense(capsuleId, organizationId);
    
    if (!license) {
      return {
        valid: false,
        reason: 'No active license found',
        requiredAction: 'purchase_license'
      };
    }
    
    // Check expiration
    if (license.valid_until && new Date() > license.valid_until) {
      return {
        valid: false,
        reason: 'License expired',
        requiredAction: 'renew_license',
        expiredAt: license.valid_until
      };
    }
    
    // Check operation permissions
    const operationAllowed = await this.checkOperationPermission(
      license,
      requestedOperation
    );
    
    if (!operationAllowed) {
      return {
        valid: false,
        reason: `Operation '${requestedOperation}' not permitted under current license`,
        requiredAction: 'upgrade_license'
      };
    }
    
    // Check usage limits
    const usageCheck = await this.checkUsageLimits(license, requestedOperation);
    
    if (!usageCheck.allowed) {
      return {
        valid: false,
        reason: usageCheck.reason,
        requiredAction: 'upgrade_license',
        currentUsage: usageCheck.currentUsage,
        limit: usageCheck.limit
      };
    }
    
    return {
      valid: true,
      license,
      remainingUsage: usageCheck.remaining
    };
  }
}

Revenue Sharing Model

Revenue Distribution 

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class RevenueManager {
  private readonly PLATFORM_FEE_RATES = {
    basic: 0.30,      // 30% for basic publishers
    verified: 0.25,   // 25% for verified publishers
    premium: 0.20,    // 20% for premium publishers
    enterprise: 0.15  // 15% for enterprise partnerships
  };
  
  async processRevenue(
    transactionId: string,
    capsuleId: string,
    grossAmount: number,
    currency = 'USD'
  ): Promise<RevenueDistribution> {
    
    const transaction = await this.beginTransaction();
    
    try {
      // Get capsule and publisher information
      const capsule = await this.getMarketplaceCapsule(capsuleId);
      const publisher = await this.getPublisher(capsule.publisher_id);
      
      // Calculate platform fee based on publisher tier
      const platformFeeRate = this.PLATFORM_FEE_RATES[publisher.tier] || this.PLATFORM_FEE_RATES.basic;
      const platformFee = grossAmount * platformFeeRate;
      const netAmount = grossAmount - platformFee;
      
      // Handle referral commissions if applicable
      const referralCommission = await this.calculateReferralCommission(
        transactionId,
        grossAmount
      );
      
      const finalNetAmount = netAmount - (referralCommission?.amount || 0);
      
      // Create revenue record
      const revenueRecord: RevenueRecord = {
        id: uuid(),
        capsule_id: capsuleId,
        publisher_id: publisher.id,
        organization_id: await this.getTransactionOrganization(transactionId),
        revenue_type: await this.getRevenueType(transactionId),
        gross_amount: grossAmount,
        platform_fee: platformFee,
        net_amount: finalNetAmount,
        currency,
        billing_period: this.getCurrentBillingPeriod(),
        transaction_id: transactionId,
        created_at: new Date()
      };
      
      await this.storeRevenueRecord(revenueRecord);
      
      // Update publisher revenue statistics
      await this.updatePublisherRevenue(publisher.id, finalNetAmount, currency);
      
      // Process payout if threshold reached
      await this.checkPayoutThreshold(publisher.id);
      
      // Handle referral payout
      if (referralCommission) {
        await this.processReferralPayout(referralCommission);
      }
      
      await transaction.commit();
      
      return {
        revenueRecordId: revenueRecord.id,
        grossAmount,
        platformFee,
        netAmount: finalNetAmount,
        publisherShare: finalNetAmount,
        platformShare: platformFee,
        referralCommission: referralCommission?.amount || 0,
        currency
      };
      
    } catch (error) {
      await transaction.rollback();
      throw error;
    }
  }
  
  async generatePayoutReport(
    publisherId: string,
    period: BillingPeriod
  ): Promise<PayoutReport> {
    
    const revenues = await this.getPublisherRevenues(publisherId, period);
    const adjustments = await this.getPublisherAdjustments(publisherId, period);
    
    // Group by currency
    const currencyTotals = new Map<string, PayoutCurrencyTotal>();
    
    for (const revenue of revenues) {
      const existing = currencyTotals.get(revenue.currency) || {
        currency: revenue.currency,
        grossRevenue: 0,
        platformFees: 0,
        netRevenue: 0,
        adjustments: 0,
        finalPayout: 0,
        transactionCount: 0
      };
      
      existing.grossRevenue += revenue.gross_amount;
      existing.platformFees += revenue.platform_fee;
      existing.netRevenue += revenue.net_amount;
      existing.transactionCount += 1;
      
      currencyTotals.set(revenue.currency, existing);
    }
    
    // Apply adjustments
    for (const adjustment of adjustments) {
      const existing = currencyTotals.get(adjustment.currency);
      if (existing) {
        existing.adjustments += adjustment.amount;
        existing.finalPayout = existing.netRevenue + existing.adjustments;
      }
    }
    
    return {
      publisherId,
      period,
      currencyTotals: Array.from(currencyTotals.values()),
      totalTransactions: revenues.length,
      payoutStatus: await this.getPayoutStatus(publisherId, period),
      taxInformation: await this.getTaxInformation(publisherId),
      paymentMethod: await this.getPaymentMethod(publisherId)
    };
  }
  
  async processAutomaticPayout(publisherId: string): Promise<PayoutResult> {
    const publisher = await this.getPublisher(publisherId);
    const pendingRevenue = await this.getPendingRevenue(publisherId);
    
    // Check minimum payout threshold
    if (pendingRevenue.totalAmount < publisher.minimum_payout_threshold) {
      return {
        success: false,
        reason: 'Below minimum payout threshold',
        currentAmount: pendingRevenue.totalAmount,
        threshold: publisher.minimum_payout_threshold
      };
    }
    
    // Process payout through payment provider
    const payoutResult = await this.processPayment({
      publisherId,
      amount: pendingRevenue.totalAmount,
      currency: pendingRevenue.currency,
      paymentMethod: publisher.payment_method,
      description: `Marketplace revenue payout for ${this.getCurrentBillingPeriod()}`
    });
    
    if (payoutResult.success) {
      // Mark revenue as paid
      await this.markRevenueAsPaid(publisherId, pendingRevenue.revenueIds);
      
      // Log payout transaction
      await this.logPayoutTransaction({
        publisherId,
        amount: pendingRevenue.totalAmount,
        currency: pendingRevenue.currency,
        transactionId: payoutResult.transactionId,
        paymentMethod: publisher.payment_method,
        processedAt: new Date()
      });
    }
    
    return payoutResult;
  }
}

Quality Control System

Automated Quality Checks 

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class QualityController {
  async performQualityAssessment(capsuleId: string): Promise<QualityAssessment> {
    const assessment: QualityAssessment = {
      capsuleId,
      timestamp: new Date(),
      overallScore: 0,
      categories: {
        functionality: await this.assessFunctionality(capsuleId),
        security: await this.assessSecurity(capsuleId),
        performance: await this.assessPerformance(capsuleId),
        documentation: await this.assessDocumentation(capsuleId),
        usability: await this.assessUsability(capsuleId),
        maintenance: await this.assessMaintenance(capsuleId)
      },
      issues: [],
      recommendations: [],
      certificationLevel: 'none'
    };
    
    // Calculate overall score
    const scores = Object.values(assessment.categories).map(c => c.score);
    assessment.overallScore = scores.reduce((sum, score) => sum + score, 0) / scores.length;
    
    // Collect all issues
    Object.values(assessment.categories).forEach(category => {
      assessment.issues.push(...category.issues);
    });
    
    // Generate recommendations
    assessment.recommendations = await this.generateQualityRecommendations(assessment);
    
    // Determine certification level
    assessment.certificationLevel = this.determineCertificationLevel(assessment);
    
    return assessment;
  }
  
  private async assessSecurity(capsuleId: string): Promise<QualityCategory> {
    const securityChecks: SecurityCheck[] = [
      {
        name: 'dependency_vulnerabilities',
        check: async () => await this.scanDependencyVulnerabilities(capsuleId),
        weight: 0.3,
        critical: true
      },
      {
        name: 'code_security',
        check: async () => await this.performStaticSecurityAnalysis(capsuleId),
        weight: 0.25,
        critical: true
      },
      {
        name: 'permission_usage',
        check: async () => await this.validatePermissionUsage(capsuleId),
        weight: 0.2,
        critical: false
      },
      {
        name: 'data_handling',
        check: async () => await this.assessDataHandling(capsuleId),
        weight: 0.15,
        critical: true
      },
      {
        name: 'authentication',
        check: async () => await this.validateAuthentication(capsuleId),
        weight: 0.1,
        critical: false
      }
    ];
    
    let totalScore = 0;
    let totalWeight = 0;
    const issues: QualityIssue[] = [];
    
    for (const check of securityChecks) {
      const result = await check.check();
      const weightedScore = result.score * check.weight;
      
      totalScore += weightedScore;
      totalWeight += check.weight;
      
      if (result.issues) {
        issues.push(...result.issues.map(issue => ({
          ...issue,
          category: 'security',
          critical: check.critical && issue.severity === 'high'
        })));
      }
    }
    
    return {
      name: 'security',
      score: totalScore / totalWeight,
      weight: 0.25,
      issues,
      passed: issues.filter(i => i.critical).length === 0
    };
  }
  
  private async assessPerformance(capsuleId: string): Promise<QualityCategory> {
    // Run performance benchmarks
    const benchmarks = await this.runPerformanceBenchmarks(capsuleId);
    
    const performanceMetrics = {
      responseTime: this.evaluateResponseTime(benchmarks.responseTime),
      throughput: this.evaluateThroughput(benchmarks.throughput),
      resourceUsage: this.evaluateResourceUsage(benchmarks.resourceUsage),
      scalability: this.evaluateScalability(benchmarks.scalability),
      reliability: this.evaluateReliability(benchmarks.reliability)
    };
    
    const issues: QualityIssue[] = [];
    let totalScore = 0;
    
    Object.entries(performanceMetrics).forEach(([metric, evaluation]) => {
      totalScore += evaluation.score;
      
      if (evaluation.issues) {
        issues.push(...evaluation.issues.map(issue => ({
          ...issue,
          category: 'performance',
          metric
        })));
      }
    });
    
    return {
      name: 'performance',
      score: totalScore / Object.keys(performanceMetrics).length,
      weight: 0.2,
      issues,
      passed: issues.filter(i => i.severity === 'high').length === 0,
      benchmarks: benchmarks
    };
  }
  
  private determineCertificationLevel(assessment: QualityAssessment): CertificationLevel {
    const criticalIssues = assessment.issues.filter(i => i.critical);
    const highSeverityIssues = assessment.issues.filter(i => i.severity === 'high');
    
    if (criticalIssues.length > 0) {
      return 'none';
    }
    
    if (assessment.overallScore >= 0.9 && highSeverityIssues.length === 0) {
      return 'enterprise';
    } else if (assessment.overallScore >= 0.8 && highSeverityIssues.length <= 2) {
      return 'advanced';
    } else if (assessment.overallScore >= 0.7 && highSeverityIssues.length <= 5) {
      return 'basic';
    }
    
    return 'none';
  }
}

Marketplace Moderation 

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class MarketplaceModerator {
  async moderateNewSubmission(capsuleId: string): Promise<ModerationResult> {
    const moderation: ModerationResult = {
      capsuleId,
      status: 'pending',
      checks: [],
      issues: [],
      approved: false,
      autoApprove: false
    };
    
    // Automated checks
    const automatedChecks = await this.runAutomatedChecks(capsuleId);
    moderation.checks.push(...automatedChecks);
    
    // Content policy compliance
    const policyCheck = await this.checkContentPolicy(capsuleId);
    moderation.checks.push(policyCheck);
    
    // Quality assessment
    const qualityCheck = await this.performQualityAssessment(capsuleId);
    moderation.checks.push(qualityCheck);
    
    // Determine if manual review needed
    const needsManualReview = this.needsManualReview(moderation.checks);
    
    if (!needsManualReview && this.allChecksPassed(moderation.checks)) {
      moderation.status = 'approved';
      moderation.approved = true;
      moderation.autoApprove = true;
    } else if (needsManualReview) {
      moderation.status = 'manual_review';
      await this.queueForManualReview(capsuleId, moderation);
    } else {
      moderation.status = 'rejected';
      moderation.issues = this.extractIssues(moderation.checks);
    }
    
    await this.saveModerationResult(moderation);
    await this.notifyPublisher(capsuleId, moderation);
    
    return moderation;
  }
  
  private needsManualReview(checks: ModerationCheck[]): boolean {
    return checks.some(check => 
      check.flagged || 
      check.confidence < 0.8 || 
      check.requiresHumanReview
    );
  }
}

The Knowledge Marketplace provides a comprehensive ecosystem for discovering, evaluating, and managing Knowledge Capsules, with sophisticated search capabilities, transparent review systems, flexible licensing models, fair revenue sharing, and robust quality control mechanisms that ensure a high-quality experience for both publishers and consumers.

Developer Guide