# Veritabanı Şema Dokümantasyonu

Yakıt Takip Sistemi veritabanı yapısı, tablolar, ilişkiler ve veri modeli hakkında kapsamlı bilgi.

## 📋 İçerik

- [Genel Bakış](#genel-bakış)
- [Tablolar](#tablolar)
- [İlişkiler](#ilişkiler)
- [Veri Modeli](#veri-modeli)
- [Index'ler](#indexler)
- [Örnek Veriler](#örnek-veriler)
- [Migration](#migration)

## 🗄️ Genel Bakış

### Veritabanı Türü
- **Motor**: SQLite 3
- **Dosya**: `data/app.db`
- **Encoding**: UTF-8
- **Foreign Keys**: Aktif

### Tasarım İlkeleri
- Normalizasyon: 3NF
- Veri bütünlüğü: Foreign key constraints
- Audit trail: created_at timestamp'ları
- Atomic operations: Transaction destek

## 📊 Tablolar

### users
Sistem kullanıcılarını ve rollerini tutar.

```sql
CREATE TABLE users (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  username TEXT UNIQUE NOT NULL,
  password TEXT NOT NULL,
  role TEXT NOT NULL CHECK(role IN ('admin','fuel_manager','inventory_manager')),
  display_name TEXT NOT NULL,
  created_at TEXT DEFAULT CURRENT_TIMESTAMP
);
```

| Kolon | Tip | Kısıtlar | Açıklama |
|-------|-----|----------|----------|
| id | INTEGER | PRIMARY KEY, AUTOINCREMENT | Benzersiz kullanıcı ID |
| username | TEXT | UNIQUE, NOT NULL | Kullanıcı adı |
| password | TEXT | NOT NULL | Şifre (hash'lenmemiş) |
| role | TEXT | NOT NULL, CHECK | Kullanıcı rolü |
| display_name | TEXT | NOT NULL | Görünen ad |
| created_at | TEXT | DEFAULT CURRENT_TIMESTAMP | Kayıt tarihi |

### vehicles
Araç bilgilerini tutar.

```sql
CREATE TABLE vehicles (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  brand TEXT NOT NULL,
  model TEXT NOT NULL,
  year INTEGER NOT NULL,
  plate TEXT UNIQUE NOT NULL,
  created_at TEXT DEFAULT CURRENT_TIMESTAMP
);
```

| Kolon | Tip | Kısıtlar | Açıklama |
|-------|-----|----------|----------|
| id | INTEGER | PRIMARY KEY, AUTOINCREMENT | Benzersiz araç ID |
| brand | TEXT | NOT NULL | Marka |
| model | TEXT | NOT NULL | Model |
| year | INTEGER | NOT NULL | Model yılı |
| plate | TEXT | UNIQUE, NOT NULL | Plaka |
| created_at | TEXT | DEFAULT CURRENT_TIMESTAMP | Kayıt tarihi |

### units
Askeri birlik bilgilerini tutar.

```sql
CREATE TABLE units (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  name TEXT UNIQUE NOT NULL,
  address TEXT NOT NULL,
  stk TEXT NOT NULL,
  btk TEXT NOT NULL,
  contact_name TEXT NOT NULL,
  contact_rank TEXT NOT NULL,
  contact_registry TEXT NOT NULL,
  contact_identity TEXT NOT NULL,
  contact_phone TEXT NOT NULL,
  created_at TEXT DEFAULT CURRENT_TIMESTAMP
);
```

| Kolon | Tip | Kısıtlar | Açıklama |
|-------|-----|----------|----------|
| id | INTEGER | PRIMARY KEY, AUTOINCREMENT | Benzersiz birlik ID |
| name | TEXT | UNIQUE, NOT NULL | Birlik adı |
| address | TEXT | NOT NULL | Adres |
| stk | TEXT | NOT NULL | STK kodu |
| btk | TEXT | NOT NULL | BTK kodu |
| contact_name | TEXT | NOT NULL | Sorumlu kişi adı |
| contact_rank | TEXT | NOT NULL | Rütbe |
| contact_registry | TEXT | NOT NULL | Sicil no |
| contact_identity | TEXT | NOT NULL | TC kimlik no |
| contact_phone | TEXT | NOT NULL | Telefon |
| created_at | TEXT | DEFAULT CURRENT_TIMESTAMP | Kayıt tarihi |

### fuel_personnel
Yakıt personeli bilgilerini tutar.

```sql
CREATE TABLE fuel_personnel (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  full_name TEXT NOT NULL,
  rank TEXT NOT NULL,
  registry_number TEXT UNIQUE NOT NULL,
  identity_number TEXT NOT NULL,
  phone TEXT NOT NULL,
  created_at TEXT DEFAULT CURRENT_TIMESTAMP
);
```

| Kolon | Tip | Kısıtlar | Açıklama |
|-------|-----|----------|----------|
| id | INTEGER | PRIMARY KEY, AUTOINCREMENT | Benzersiz personel ID |
| full_name | TEXT | NOT NULL | Tam ad |
| rank | TEXT | NOT NULL | Rütbe |
| registry_number | TEXT | UNIQUE, NOT NULL | Sicil numarası |
| identity_number | TEXT | NOT NULL | TC kimlik no |
| phone | TEXT | NOT NULL | Telefon |
| created_at | TEXT | DEFAULT CURRENT_TIMESTAMP | Kayıt tarihi |

### fuel_slips
Yakıt ikmal fişlerini tutar.

```sql
CREATE TABLE fuel_slips (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  slip_number INTEGER UNIQUE,
  created_at TEXT DEFAULT CURRENT_TIMESTAMP,
  slip_date TEXT NOT NULL,
  force TEXT NOT NULL,
  unit_id INTEGER NOT NULL,
  unit_name TEXT NOT NULL,
  vehicle_id INTEGER NOT NULL,
  vehicle_description TEXT NOT NULL,
  plate TEXT NOT NULL,
  fuel_amount_number REAL NOT NULL,
  fuel_amount_text TEXT NOT NULL,
  fuel_type TEXT NOT NULL,
  receiver_id INTEGER NOT NULL,
  receiver_name TEXT NOT NULL,
  receiver_rank TEXT NOT NULL,
  receiver_registry TEXT NOT NULL,
  receiver_phone TEXT NOT NULL,
  giver_id INTEGER NOT NULL,
  giver_name TEXT NOT NULL,
  giver_rank TEXT NOT NULL,
  giver_registry TEXT NOT NULL,
  giver_phone TEXT NOT NULL,
  notes TEXT,
  inventory_manager_id INTEGER NOT NULL,
  fuel_manager_id INTEGER NOT NULL,
  status TEXT DEFAULT 'pending',
  rejection_reason TEXT,
  FOREIGN KEY (unit_id) REFERENCES units(id),
  FOREIGN KEY (vehicle_id) REFERENCES vehicles(id),
  FOREIGN KEY (receiver_id) REFERENCES fuel_personnel(id),
  FOREIGN KEY (giver_id) REFERENCES fuel_personnel(id),
  FOREIGN KEY (inventory_manager_id) REFERENCES users(id),
  FOREIGN KEY (fuel_manager_id) REFERENCES users(id)
);
```

| Kolon | Tip | Kısıtlar | Açıklama |
|-------|-----|----------|----------|
| id | INTEGER | PRIMARY KEY, AUTOINCREMENT | Benzersiz fiş ID |
| slip_number | INTEGER | UNIQUE | Fiş seri numarası |
| created_at | TEXT | DEFAULT CURRENT_TIMESTAMP | Oluşturma tarihi |
| slip_date | TEXT | NOT NULL | Fiş tarihi |
| force | TEXT | NOT NULL | Kuvvet (MSB, KKK, etc.) |
| unit_id | INTEGER | FOREIGN KEY, NOT NULL | Birlik ID |
| unit_name | TEXT | NOT NULL | Birlik adı (redunant) |
| vehicle_id | INTEGER | FOREIGN KEY, NOT NULL | Araç ID |
| vehicle_description | TEXT | NOT NULL | Araç açıklaması |
| plate | TEXT | NOT NULL | Plaka |
| fuel_amount_number | REAL | NOT NULL | Yakıt miktarı (rakam) |
| fuel_amount_text | TEXT | NOT NULL | Yakıt miktarı (yazı) |
| fuel_type | TEXT | NOT NULL | Yakıt türü |
| receiver_id | INTEGER | FOREIGN KEY, NOT NULL | Teslim alan ID |
| receiver_name | TEXT | NOT NULL | Teslim alan adı |
| receiver_rank | TEXT | NOT NULL | Teslim alan rütbesi |
| receiver_registry | TEXT | NOT NULL | Teslim alan sicili |
| receiver_phone | TEXT | NOT NULL | Teslim alan telefonu |
| giver_id | INTEGER | FOREIGN KEY, NOT NULL | Teslim eden ID |
| giver_name | TEXT | NOT NULL | Teslim eden adı |
| giver_rank | TEXT | NOT NULL | Teslim eden rütbesi |
| giver_registry | TEXT | NOT NULL | Teslim eden sicili |
| giver_phone | TEXT | NOT NULL | Teslim eden telefonu |
| notes | TEXT | NULL | Notlar |
| inventory_manager_id | INTEGER | FOREIGN KEY, NOT NULL | Mal sorumlusu ID |
| fuel_manager_id | INTEGER | FOREIGN KEY, NOT NULL | Yakıt sorumlusu ID |
| status | TEXT | DEFAULT 'pending' | Durum (pending/approved/rejected) |
| rejection_reason | TEXT | NULL | Red gerekçesi |

## 🔗 İlişkiler

### Entity Relationship Diagram
```
users (1) -----> (0..n) fuel_slips (fuel_manager_id)
users (1) -----> (0..n) fuel_slips (inventory_manager_id)
users (1) -----> (0..n) users (admin creates)

units (1) -----> (0..n) fuel_slips (unit_id)

vehicles (1) -----> (0..n) fuel_slips (vehicle_id)

fuel_personnel (1) -----> (0..n) fuel_slips (receiver_id)
fuel_personnel (1) -----> (0..n) fuel_slips (giver_id)
```

### Relationship Types
- **One-to-Many**: users → fuel_slips (hem fuel_manager_id hem de inventory_manager_id)
- **One-to-Many**: units → fuel_slips
- **One-to-Many**: vehicles → fuel_slips
- **One-to-Many**: fuel_personnel → fuel_slips (hem receiver_id hem de giver_id)

## 📈 Veri Modeli

### Status Flow (fuel_slips.status)
```
pending → approved
    ↓
  rejected
```

### Role Hierarchy
```
admin (süper kullanıcı)
├── fuel_manager (fiş oluşturabilir)
└── inventory_manager (fiş onaylayabilir)
```

### Kuvvet Listesi (Enum)
```sql
-- Geçerli kuvvet değerleri
'MSB', 'K.K.K.', 'Dz.K.K.', 'Hv.K.K.', 'SGK', 'Gnkur. Bşk.', 'Hrt.Gn.K.'
```

### Yakıt Türleri (Örnek)
```sql
-- Örnek yakıt türleri
'Benzin', 'Motorin', 'Benzin-95', 'Motorin-10', 'LPG'
```

## 🗂️ Index'ler

### Otomatik Index'ler
- `PRIMARY KEY` → Her tabloda otomatik oluşturulur
- `UNIQUE` → Belirtilen kolonlarda otomatik oluşturulur

### Önerilen Manuel Index'ler
```sql
-- Performans için önerilen index'ler
CREATE INDEX idx_fuel_slips_status ON fuel_slips(status);
CREATE INDEX idx_fuel_slips_date ON fuel_slips(slip_date);
CREATE INDEX idx_fuel_slips_inventory_manager ON fuel_slips(inventory_manager_id);
CREATE INDEX idx_fuel_slips_fuel_manager ON fuel_slips(fuel_manager_id);
CREATE INDEX idx_vehicles_plate ON vehicles(plate);
CREATE INDEX idx_units_name ON units(name);
CREATE INDEX idx_users_role ON users(role);
```

## 📝 Örnek Veriler

### users Tablosu
```sql
INSERT INTO users (username, password, role, display_name) VALUES
('admin', 'Admin!123', 'admin', 'Istasyon Admini'),
('yakitsorum', 'Yakit@123', 'fuel_manager', 'Yakit Sorumlusu'),
('malsorum1', 'Mal@123', 'inventory_manager', 'Mal Sorumlusu 1');
```

### vehicles Tablosu
```sql
INSERT INTO vehicles (brand, model, year, plate) VALUES
('Ford', 'Transit', 2021, '34 AYT 312'),
('Isuzu', 'NPR', 2019, '34 FZT 908');
```

### units Tablosu
```sql
INSERT INTO units (
  name, address, stk, btk, contact_name, contact_rank,
  contact_registry, contact_identity, contact_phone
) VALUES
(
  'Merkez Birlik',
  'Cumhuriyet Mah. İstasyon Cad. No:12/1 İstanbul',
  'STK-4589',
  'BTK-9021',
  'Yzb. Murat Kaya',
  'Yuzbasi',
  'MK4587',
  '25478963210',
  '+90 532 456 78 12'
);
```

### fuel_personnel Tablosu
```sql
INSERT INTO fuel_personnel (
  full_name, rank, registry_number, identity_number, phone
) VALUES
(
  'Astsb. Cahit Demir',
  'Astsubay',
  'CD5561',
  '14523698741',
  '+90 532 223 45 67'
),
(
  'Sv. Uzm. Er Ali Korkmaz',
  'Sozlesmeli Er',
  'AK7812',
  '32987456100',
  '+90 555 893 22 10'
);
```

### fuel_slips Tablosu
```sql
INSERT INTO fuel_slips (
  slip_number, slip_date, force, unit_id, unit_name,
  vehicle_id, vehicle_description, plate,
  fuel_amount_number, fuel_amount_text, fuel_type,
  receiver_id, receiver_name, receiver_rank, receiver_registry, receiver_phone,
  giver_id, giver_name, giver_rank, giver_registry, giver_phone,
  inventory_manager_id, fuel_manager_id
) VALUES
(
  1, '2024-01-01', 'MSB', 1, 'Merkez Birlik',
  1, 'Ford Transit', '34 AYT 312',
  50, 'Elli', 'Benzin',
  1, 'Astsb. Cahit Demir', 'Astsubay', 'CD5561', '+90 532 223 45 67',
  2, 'Sv. Uzm. Er Ali Korkmaz', 'Sozlesmeli Er', 'AK7812', '+90 555 893 22 10',
  3, 2
);
```

## 🔄 Migration

### Sürüm Geçmişi

#### v1.0.0 - İlk Sürüm
- users, vehicles, units, fuel_personnel, fuel_slips tabloları oluşturuldu
- Temel foreign key ilişkileri kuruldu
- Örnek veriler eklendi

#### v1.1.0 - Status Eklendi
- `fuel_slips` tablosuna `status` kolonu eklendi
- `fuel_slips` tablosuna `rejection_reason` kolonu eklendi
- Mevcut kayıtlar için 'pending' olarak varsayılan değer atandı

### Migration Script'i
```sql
-- v1.1.0 Migration
ALTER TABLE fuel_slips ADD COLUMN status TEXT DEFAULT 'pending';
ALTER TABLE fuel_slips ADD COLUMN rejection_reason TEXT;

-- Örnek index'ler
CREATE INDEX IF NOT EXISTS idx_fuel_slips_status ON fuel_slips(status);
CREATE INDEX IF NOT EXISTS idx_fuel_slips_date ON fuel_slips(slip_date);
CREATE INDEX IF NOT EXISTS idx_fuel_slips_inventory_manager ON fuel_slips(inventory_manager_id);
```

### Veritabanı Yedekleme
```bash
# SQLite yedekleme
sqlite3 data/app.db ".backup data/app_backup_$(date +%Y%m%d_%H%M%S).db"

# Veri dışa aktarma
sqlite3 data/app.db ".dump" > data/app_export_$(date +%Y%m%d_%H%M%S).sql

# Veri içe aktarma
sqlite3 data/app.db < data/app_export_20240101_120000.sql
```

## 🔍 Veri Sorguları

### Yaygın Sorgular

#### Aktif Kullanıcılar
```sql
SELECT role, COUNT(*) as count FROM users GROUP BY role;
```

#### Aylık Yakıt İstatistikleri
```sql
SELECT
  strftime('%Y-%m', slip_date) as month,
  COUNT(*) as slip_count,
  SUM(fuel_amount_number) as total_fuel
FROM fuel_slips
WHERE status = 'approved'
GROUP BY strftime('%Y-%m', slip_date)
ORDER BY month DESC;
```

#### Birlik Bazında İstatistikler
```sql
SELECT
  u.name,
  COUNT(fs.id) as slip_count,
  SUM(fs.fuel_amount_number) as total_fuel
FROM units u
LEFT JOIN fuel_slips fs ON u.id = fs.unit_id AND fs.status = 'approved'
GROUP BY u.id, u.name
ORDER BY slip_count DESC;
```

#### Personel Aktivitesi
```sql
SELECT
  fp.full_name,
  fp.rank,
  COUNT(CASE WHEN fs.id IS NOT NULL THEN 1 END) as slips_involved
FROM fuel_personnel fp
LEFT JOIN fuel_slips fs ON fp.id = fs.receiver_id OR fp.id = fs.giver_id
GROUP BY fp.id, fp.full_name, fp.rank
ORDER BY slips_involved DESC;
```

---

**Not**: Veritabanı yapısı geliştirme sürecinde değişebilir. Migration geçmişini takip etmek önemlidir.