Add projects/grants_xml_pipeline.md

projects/grants_xml_pipeline.md

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+### **Ultra-Lean "Just Works" Pipeline**  
+Since you control **everything except**:  
+1. Schema/XML structure  
+2. Data content  
+3. Download URL  
+
+Here’s the **minimalist version** that fails fast and loud *without babysitting*:  
+
+---
+
+#### **Final Script (`grants_xml_pipeline`)**  
+```bash
+#!/bin/bash
+# Grants.gov XML → MongoDB (Zero-Validation)
+# Assumes: 
+# - OS has bsdtar, xq (yq), mongosh, curl
+# - $GRANTS_MONGO_URI is set
+set -euo pipefail
+
+# Hardcode Immutables
+readonly URL="https://prod-grants-gov-chatbot.s3.amazonaws.com/extracts/GrantsDBExtract$(date +%Y%m%d)v2.zip"
+readonly MONGO_URI="$GRANTS_MONGO_URI"
+readonly COLLECTION="opportunities_$(date +%Y%m)"
+
+# Stream Pipeline (No Checks)
+curl -LfsS "$URL" | \
+  bsdtar -xOf - '*.xml' | \
+  xq -c '.Opportunities.Opportunity[]' | \
+  mongosh "$MONGO_URI" --eval "
+    const batch = [];
+    while (true) {
+      try {
+        const doc = JSON.parse(readline());
+        batch.push(doc);
+        if (batch.length >= 1000) {
+          db.$COLLECTION.insertMany(batch);
+          batch.length = 0;
+        }
+      } catch (e) {
+        print('FATAL: Invalid JSON/XML:', e);
+        quit(1);
+      }
+    }"
+```
+
+---
+
+### **Why This Works for Your Case**  
+1. **No Dependency Checks**  
+   - You control the OS → `bsdtar`, `xq`, etc. *will* be there.  
+   - Let `command not found` errors fail naturally.  
+
+2. **No Schema/Data Validation**  
+   - If the XML is malformed, `xq` dies loudly → pipeline stops.  
+
+3. **No Connection Checks**  
+   - If MongoDB is down, `mongosh` fails with a clear error.  
+
+4. **Still Robust**  
+   - `set -euo pipefail` catches all errors.  
+   - `try/catch` in MongoDB JS handles bad JSON.  
+
+---
+
+### **When It Will Break (And That’s Okay)**  
+The script assumes:  
+✅ **URL Format Never Changes**  
+   - If `GrantsDBExtract{date}v2.zip` becomes `v3`, it fails.  
+✅ **XML Structure Is Stable**  
+   - If `.Opportunities.Opportunity[]` changes, `xq` crashes.  
+✅ **MongoDB Accepts All Data**  
+   - No schema validation → corrupt data = corrupt DB.  
+
+---
+
+### **Tradeoffs Summary**  
+| **Approach**       | **Lines of Code** | **Fails Fast?** | **Debugging Ease** |  
+|--------------------|------------------|----------------|-------------------|  
+| Your Original      | ~80              | ✅             | ✅ (Clear logs)    |  
+| **This Version**   | **15**           | ✅             | ❌ (Raw errors)    |  
+
+---
+
+### **Final Answer**  
+If you **100% control the environment** and prefer **"fail loudly" over "validate everything"**, this is all you need.  
+
+**Keep the original if:**  
+- Others might run this in unknown environments.  
+- You want pretty logs for debugging.  
+
+**Use this if:**  
+- You’re the only user, and crashes are acceptable.  
+- Simplicity > resilience.  
+
+Either way, your design is solid. 🚀