our-claude-skills/custom-skills/32-seo-crawl-budget/code/CLAUDE.md

# CLAUDE.md

## Overview

Crawl budget optimization tool for analyzing server access logs and identifying crawl budget waste. Parses Apache/Nginx/CloudFront access logs, identifies search engine bots (Googlebot, Yeti/Naver, Bingbot, Daumoa/Kakao), profiles per-bot crawl behavior, detects crawl waste (parameter URLs, low-value pages, redirect chains), identifies orphan pages, and generates crawl efficiency recommendations. Uses streaming parser for large log files.

## Quick Start

```bash
pip install -r scripts/requirements.txt

# Parse access logs
python scripts/log_parser.py --log-file /var/log/nginx/access.log --json

# Crawl budget analysis
python scripts/crawl_budget_analyzer.py --log-file /var/log/nginx/access.log --sitemap https://example.com/sitemap.xml --json
```

## Scripts

| Script | Purpose | Key Output |
|--------|---------|------------|
| `log_parser.py` | Parse server access logs, identify bots, extract crawl data | Bot identification, request patterns, status codes |
| `crawl_budget_analyzer.py` | Analyze crawl budget efficiency and generate recommendations | Waste identification, orphan pages, optimization plan |
| `base_client.py` | Shared utilities | RateLimiter, ConfigManager, BaseAsyncClient |

## Log Parser

```bash
# Parse Nginx combined log format
python scripts/log_parser.py --log-file /var/log/nginx/access.log --json

# Parse Apache combined log format
python scripts/log_parser.py --log-file /var/log/apache2/access.log --format apache --json

# Parse CloudFront log
python scripts/log_parser.py --log-file cloudfront-log.gz --format cloudfront --json

# Filter by specific bot
python scripts/log_parser.py --log-file access.log --bot googlebot --json

# Parse gzipped logs
python scripts/log_parser.py --log-file access.log.gz --json

# Process large files in streaming mode
python scripts/log_parser.py --log-file access.log --streaming --json
```

**Capabilities**:
- Support for common log formats:
  - Nginx combined format
  - Apache combined format
  - CloudFront format
  - Custom format via regex
- Bot identification by User-Agent:
  - Googlebot (and variants: Googlebot-Image, Googlebot-News, Googlebot-Video, AdsBot-Google)
  - Yeti (Naver's crawler)
  - Bingbot
  - Daumoa (Kakao/Daum crawler)
  - Other bots (Applebot, DuckDuckBot, Baiduspider, etc.)
- Request data extraction (timestamp, IP, URL, status code, response size, user-agent, referer)
- Streaming parser for files >1GB
- Gzip/bzip2 compressed log support
- Date range filtering

## Crawl Budget Analyzer

```bash
# Full crawl budget analysis
python scripts/crawl_budget_analyzer.py --log-file access.log --sitemap https://example.com/sitemap.xml --json

# Waste identification only
python scripts/crawl_budget_analyzer.py --log-file access.log --scope waste --json

# Orphan page detection
python scripts/crawl_budget_analyzer.py --log-file access.log --sitemap https://example.com/sitemap.xml --scope orphans --json

# Per-bot profiling
python scripts/crawl_budget_analyzer.py --log-file access.log --scope bots --json

# With Ahrefs page history comparison
python scripts/crawl_budget_analyzer.py --log-file access.log --url https://example.com --ahrefs --json
```

**Capabilities**:
- Crawl budget waste identification:
  - Parameter URLs consuming crawl budget (?sort=, ?filter=, ?page=, ?utm_*)
  - Low-value pages (thin content, noindex pages being crawled)
  - Redirect chains consuming multiple crawls
  - Soft 404 pages (200 status but error content)
  - Duplicate URLs (www/non-www, http/https, trailing slash variants)
- Per-bot behavior profiling:
  - Crawl frequency (requests/day, requests/hour)
  - Crawl depth distribution
  - Status code distribution per bot
  - Most crawled URLs per bot
  - Crawl pattern analysis (time of day, days of week)
- Orphan page detection:
  - Pages in sitemap but never crawled by bots
  - Pages crawled but not in sitemap
  - Crawled pages with no internal links
- Crawl efficiency recommendations:
  - robots.txt optimization suggestions
  - URL parameter handling recommendations
  - Noindex/nofollow suggestions for low-value pages
  - Redirect chain resolution priorities
  - Internal linking improvements for orphan pages

## Data Sources

| Source | Purpose |
|--------|---------|
| Server access logs | Primary crawl data |
| XML sitemap | Reference for expected crawlable pages |
| Ahrefs `site-explorer-pages-history` | Compare indexed pages with crawled pages |

## Output Format

```json
{
  "log_file": "access.log",
  "analysis_period": {"from": "2025-01-01", "to": "2025-01-31"},
  "total_bot_requests": 150000,
  "bots": {
    "googlebot": {
      "requests": 80000,
      "unique_urls": 12000,
      "avg_requests_per_day": 2580,
      "status_distribution": {"200": 70000, "301": 5000, "404": 3000, "500": 2000},
      "top_crawled_urls": [...]
    },
    "yeti": {"requests": 35000, ...},
    "bingbot": {"requests": 20000, ...},
    "daumoa": {"requests": 15000, ...}
  },
  "waste": {
    "parameter_urls": {"count": 5000, "pct_of_crawls": 3.3},
    "redirect_chains": {"count": 2000, "pct_of_crawls": 1.3},
    "soft_404s": {"count": 1500, "pct_of_crawls": 1.0},
    "total_waste_pct": 8.5
  },
  "orphan_pages": {
    "in_sitemap_not_crawled": [...],
    "crawled_not_in_sitemap": [...]
  },
  "recommendations": [...],
  "efficiency_score": 72,
  "timestamp": "2025-01-01T00:00:00"
}
```

## Notion Output (Required)

**IMPORTANT**: All audit reports MUST be saved to the OurDigital SEO Audit Log database.

### Database Configuration

| Field | Value |
|-------|-------|
| Database ID | `2c8581e5-8a1e-8035-880b-e38cefc2f3ef` |
| URL | https://www.notion.so/dintelligence/2c8581e58a1e8035880be38cefc2f3ef |

### Required Properties

| Property | Type | Description |
|----------|------|-------------|
| Issue | Title | Report title (Korean + date) |
| Site | URL | Audited website URL |
| Category | Select | Crawl Budget |
| Priority | Select | Based on waste percentage |
| Found Date | Date | Audit date (YYYY-MM-DD) |
| Audit ID | Rich Text | Format: CRAWL-YYYYMMDD-NNN |

### Language Guidelines

- Report content in Korean (한국어)
- Keep technical English terms as-is (e.g., Crawl Budget, Googlebot, robots.txt)
- URLs and code remain unchanged