# DBIS Source Code Fixes - Final Solution

**Date**: 2026-01-03  
**Status**: ✅ **CUSTOM PATH RESOLVER IMPLEMENTED**

---

## Problem

The API service failed with `MODULE_NOT_FOUND` errors for TypeScript path aliases (`@shared/`, `@/core/`, etc.). 

**Root Cause**: 
- `tsconfig-paths` resolves paths based on `tsconfig.json`, which maps aliases to `src/*`
- At runtime, files are in `dist/*`, not `src/*`
- `tsconfig-paths` was looking for files in `src/shared/config/env` but they're actually in `dist/shared/config/env`

---

## Solution Implemented

**Custom Path Resolver** - Created a runtime module resolver that maps TypeScript path aliases directly to the `dist` directory structure.

### Implementation

Created `/opt/dbis-core/dist/index-runtime.js` that:
1. Intercepts Node.js module resolution (`Module._resolveFilename`)
2. Maps path aliases (`@/`, `@/shared/`, `@/core/`, etc.) to `dist/*` directories
3. Tries multiple file extensions (`.js`, `.json`, and directory `index.js`)
4. Falls back to original Node.js resolution if alias doesn't match

---

## Files Created/Modified

### `/opt/dbis-core/dist/index-runtime.js`

This file intercepts `require()` calls and resolves path aliases to the correct locations in the `dist` directory.

**Key Features**:
- Maps `@/` → `dist/`
- Maps `@/shared/` → `dist/shared/`
- Maps `@/core/` → `dist/core/`
- Maps `@/integration/` → `dist/integration/`
- Maps `@/sovereign/` → `dist/sovereign/`
- Maps `@/infrastructure/` → `dist/infrastructure/`

### `/etc/systemd/system/dbis-api.service`

Updated `ExecStart` to use `dist/index-runtime.js` instead of `dist/index.js`.

---

## Verification

After applying the fix:

1. **Check service status**:
   ```bash
   ssh root@192.168.11.10 "pct exec 10150 -- systemctl status dbis-api"
   ```

2. **Check logs**:
   ```bash
   ssh root@192.168.11.10 "pct exec 10150 -- journalctl -u dbis-api -n 50"
   ```

3. **Test health endpoint**:
   ```bash
   curl http://192.168.11.155:3000/health
   ```

4. **Verify port listening**:
   ```bash
   ssh root@192.168.11.10 "pct exec 10150 -- ss -tln | grep 3000"
   ```

---

## Applied To

- ✅ VMID 10150 (API Primary)
- ✅ VMID 10151 (API Secondary)

---

## Why This Solution Works

1. **Direct Mapping**: Maps aliases directly to `dist/*` without needing `tsconfig.json` interpretation
2. **Runtime Resolution**: Works at runtime without build-time changes
3. **No Dependencies**: Doesn't require `tsconfig-paths` package (though it's installed)
4. **Flexible**: Handles multiple file extensions and directory indexes
5. **Fallback**: Falls back to original Node.js resolution for non-alias imports

---

## Alternative Solutions Considered

1. **tsconfig-paths**: Failed because it resolves to `src/*` instead of `dist/*`
2. **tsc-alias**: Would require rebuild and redeployment (build-time solution)
3. **Custom resolver**: ✅ **Chosen** - Works immediately at runtime

---

## Next Steps

If the service starts successfully:

1. **Test API endpoints** - Verify the API is responding correctly
2. **Run database migrations** - If needed:
   ```bash
   ssh root@192.168.11.10 "pct exec 10150 -- cd /opt/dbis-core && npx prisma migrate deploy"
   ```
3. **Test Frontend connectivity** - Verify frontend can connect to API
4. **Monitor logs** - Check for any runtime errors

---

## Summary

✅ **Custom path resolver implemented**  
✅ **Maps TypeScript aliases to dist directory**  
✅ **Applied to both API containers**  
✅ **Service configured to use runtime entry point**  

**Status**: Solution implemented and ready for testing.

---

**Last Updated**: 2026-01-03
