# PDF Storage Architecture & Permanent Preservation Strategy
**Mahanama Hayat-e-Nau Digital Archive**  
**Estimated Archive Size**: 1.02 GB across 300 Issue Volumes (1978 – 2026)  

---

## 1. Architectural Strategy: Tiered Storage Model

Committing 1+ Gigabytes of binary PDFs directly into a standard Git repository degrades clone speeds, triggers deployment timeouts, and breaches platform limits. 

We adopt a **two-tiered storage architecture**:

```
+--------------------------------------------------------------------------------+
|                                TIER 1: ACTIVE SHOWCASE                          |
|  - 10 Core Historical Showcase Issues (~73 MB)                                |
|  - Stored in: /public/archive/issues/*.pdf                                     |
|  - Bundled directly into Astro build output for 100% offline & preview fidelity |
|  - Absolute self-hosting, 0 external dependencies                             |
+--------------------------------------------------------------------------------+
                                       |
                                       v
+--------------------------------------------------------------------------------+
|                          TIER 2: FULL HISTORICAL REPOSITORY                    |
|  - 300 Discovered Issue PDFs (1.02 GB, 1978–2026)                              |
|  - Storage Engine: Dedicated Cloud Object Storage (Cloudflare R2 / AWS S3)    |
|  - Custom Subdomain / Proxy: /archive/issues/* -> CDN Bucket                   |
|  - Retains immutable SHA-256 verification hashes in migration-manifest.json   |
+--------------------------------------------------------------------------------+
```

---

## 2. Naming & Public URL Conventions

### 2.1 File Naming Convention
All issue files conform to the lowercase slug pattern:
```
hayat-{year}-{quarter/month}.pdf
```
**Examples**:
- `jul-sep-2026.pdf`
- `jul-dec-2023.pdf`
- `aug-2018.pdf`
- `nov-2016.pdf`
- `apr-1978.pdf`

### 2.2 Public URL Routing
Every PDF is accessible through the canonical static path:
```
https://hayat-e-nau.in/archive/issues/{slug}.pdf
```

---

## 3. Git Management & Deployment Footprint
- **Current Git Status**: Tier 1 showcase PDFs (73 MB) are checked into `public/archive/issues/` to ensure preview testers and auditors immediately receive valid PDF files.
- **Production Cutover**: Once Tier 2 cloud bucket is provisioned, Netlify proxy redirects (`_redirects`) route `/archive/issues/*` directly to the bucket origin with edge caching headers (`Cache-Control: public, max-age=31536000, immutable`).

---

## 4. Backup & Long-Term Preservation Protocol
1. **Primary Master Archive**: An offline archival hard drive maintained at Markaz Jamiat-ul-Falah, Bilariyaganj, Azamgarh.
2. **Secondary Cloud Mirror**: Encrypted Google Workspace Drive storage + S3-compatible Wasabi/R2 bucket.
3. **Integrity Validation**: Automated monthly integrity worker running SHA-256 checks against `src/data/migration-manifest.json`.