# Gate 3 Execution Quick Start

**Complete production readiness package for 252-day shadow run validation**

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## 📋 How to Execute (5-Minute Summary)

### Step 1: Pre-Flight (15 min)
```bash
# Read this first
GATE_3_PREFLIGHT_CHECKLIST.md

# Run scripts to verify infrastructure
.\gate3_test_api.ps1
.\gate3_check_market_data.ps1
```

### Step 2: Prepare Database (5 min)
```bash
# Create test model if needed
# Run: GATE_3_SETUP_SCRIPTS.md SQL scripts
# Creates: model, cleans state, verifies schema
```

### Step 3: Execute Shadow Run (30-60 min)
```bash
# Follow GATE_3_EXECUTION_GUIDE.md
# POST /api/shadow-runs with model ID + date window
# Monitor via Hangfire dashboard + polling script
```

### Step 4: Validate Results (10 min)
```bash
# Read: GATE_3_RESULTS_VALIDATION.md
# Run SQL queries to verify gates (PBO, DSR, Cost2x)
# Decision: Proceed to approval or remediate
```

### Step 5: Approve (5 min)
```bash
# Approval queue auto-populated
# Maker-checker approval via POST /api/v1/approval-queue/{id}/approve
# Model ready for activation
```

**Total Time:** ~90-120 minutes

---

## 📚 Complete Toolkit (5 Guides)

### GATE_3_EXECUTION_GUIDE.md
- **Length:** 7 sections, 200+ lines
- **Purpose:** Step-by-step execution checklist
- **Contains:** Prerequisites, endpoints, monitoring, validation

### GATE_3_PREFLIGHT_CHECKLIST.md
- **Length:** 5 sections, 150+ lines
- **Purpose:** 15-minute infrastructure verification
- **Contains:** SSH tunnel, PostgreSQL, API health, model selection, success criteria

### GATE_3_SETUP_SCRIPTS.md
- **Length:** 6 scripts, 300+ lines
- **Purpose:** Automated database & API preparation
- **Contains:** SQL scripts, PowerShell automation, monitoring loops

### GATE_3_RESULTS_VALIDATION.md
- **Length:** 4 sections, 250+ lines
- **Purpose:** Post-execution validation of gates
- **Contains:** Gate breakdown (PBO/DSR/Cost2x), phase analysis, audit trail

### GATE_3_TROUBLESHOOTING.md
- **Length:** 15+ issues, 300+ lines
- **Purpose:** Recovery & escalation for common failures
- **Contains:** Root causes, fixes, quick-fix table, escalation paths

---

## ✅ What You Have

**Complete, Production-Ready Execution Package:**
- ✅ 5 comprehensive guides (1,200+ lines)
- ✅ 30+ copy-paste SQL queries
- ✅ 6 PowerShell automation scripts
- ✅ Decision matrices for gate failures
- ✅ Escalation contact matrix
- ✅ Prevention & recovery checklists

**What's Already Done (Gates 1-5):**
- ✅ Gate 1: DbUp migrations (14 tests)
- ✅ Gate 2: Crash-recovery (6 tests)
- ✅ Gate 3: Shadow run (6 E2E tests + execution guides)
- ✅ Gate 4: Activation workflow (6 tests + endpoints)
- ✅ Gate 5: Observability metrics (6 tests + service)

---

## 🚀 Next Actions

1. **Read GATE_3_PREFLIGHT_CHECKLIST.md** (15 min verification)
2. **Run setup scripts** from GATE_3_SETUP_SCRIPTS.md (prepare DB)
3. **Follow GATE_3_EXECUTION_GUIDE.md** (execute shadow run)
4. **Validate with GATE_3_RESULTS_VALIDATION.md** (verify gates)
5. **Troubleshoot if needed** using GATE_3_TROUBLESHOOTING.md

---

## 📞 Support

- **Pre-flight issues?** → GATE_3_PREFLIGHT_CHECKLIST.md troubleshooting
- **Setup problems?** → GATE_3_SETUP_SCRIPTS.md scripts section
- **Execution failing?** → GATE_3_TROUBLESHOOTING.md
- **Results unclear?** → GATE_3_RESULTS_VALIDATION.md decision matrix

---

## Status

**All production readiness validation gates: READY FOR EXECUTION**

Last updated: 2026-08-02  
Preparation toolkit: COMPLETE  
Infrastructure automation: READY  
Documentation: COMPREHENSIVE
