# Database Quick Reference

## ✅ Status: FULLY OPERATIONAL

**Last Verified:** December 15, 2025  
**Database:** PostgreSQL @ 192.168.10.130:5432  
**Total Songs:** 41  
**Total Profiles:** 5

---

## Quick Commands

### Check Database

```bash
cd /media/pts/Website/Church_HOP_MusicData
bash check-database.sh
```

### Verify Schema & Functionality

```bash
cd backend
source venv/bin/activate
python3 verify_database.py
```

### Restart Services

```bash
sudo systemctl restart church-music-backend
sudo systemctl restart church-music-frontend
```

---

## API Testing

### Create Song

```bash
curl -X POST https://houseofprayer.ddns.net/api/songs \
  -H "Content-Type: application/json" \
  -d '{
    "title": "Test Song",
    "artist": "Artist",
    "lyrics": "Lyrics here",
    "chords": "C G Am F"
  }' -k
```

### Get Song

```bash
curl https://houseofprayer.ddns.net/api/songs/{id} -k
```

### List All Songs

```bash
curl https://houseofprayer.ddns.net/api/songs -k
```

### Search Songs

```bash
curl 'https://houseofprayer.ddns.net/api/songs?q=amazing' -k
```

---

## Database Connection

**File:** `backend/.env`

```
POSTGRESQL_URI=postgresql://songlyric_user:MySecurePass123@192.168.10.130:5432/church_songlyric
```

---

## Verified Functionality

✅ **Song Creation** - Working perfectly  
✅ **Song Retrieval** - All fields returned correctly  
✅ **Song Updates** - Updates persist to database  
✅ **Song Deletion** - Cascade deletes working  
✅ **Search** - Full-text search operational  
✅ **Foreign Keys** - All constraints configured  
✅ **Data Integrity** - No orphaned records

---

## Performance Notes

**Current Performance:**

- Song creation: ~50ms
- Song retrieval: ~30ms  
- Search (41 songs): ~40ms

**Recommended Optimizations:**

- Add indexes for better performance with large datasets
- See DATABASE_ANALYSIS_REPORT.md for details

---

## Maintenance Scripts

**Location:** `/media/pts/Website/Church_HOP_MusicData/backend/`

1. `verify_database.py` - Comprehensive verification
2. `fix_schema.sql` - Apply recommended indexes
3. `fix_database_schema.py` - Python migration script

---

## Common Issues

### Song not showing in frontend

1. Check if song exists: `curl https://houseofprayer.ddns.net/api/songs/{id}`
2. Clear browser cache: Ctrl+Shift+R
3. Check backend logs: `sudo journalctl -u church-music-backend -n 20`

### Database connection error

1. Check PostgreSQL is running: `sudo systemctl status postgresql`
2. Verify network access: `ping 192.168.10.130`
3. Test connection: `PGPASSWORD='MySecurePass123' psql -h 192.168.10.130 -U songlyric_user -d church_songlyric -c "SELECT 1"`

### Slow queries

1. Run verification: `python3 verify_database.py`
2. Apply indexes: See DATABASE_ANALYSIS_REPORT.md
3. Check connection pool: Restart backend if exhausted

---

## Support Files

📄 **DATABASE_ANALYSIS_REPORT.md** - Full analysis and recommendations  
📄 **POSTGRESQL_QUICK_START.md** - Setup guide  
🔧 **backend/verify_database.py** - Verification script  
🔧 **backend/fix_schema.sql** - Index creation script

---

*For detailed information, see DATABASE_ANALYSIS_REPORT.md*