feat: stabilize KYC, international assets and multi-currency schema

- Split mother's name in KYC (last/first)
- Added mileage_unit and fuel_type to Assets
- Expanded AssetCost for international VAT and original currency
- Fixed SQLAlchemy IndexError in asset catalog lookup
- Added exchange_rate and ratings tables to models

backend/app/models/asset.py

@@ -0,0 +1,133 @@
+import uuid
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, JSON, Numeric, text
+from sqlalchemy.orm import relationship
+from sqlalchemy.dialects.postgresql import UUID as PG_UUID
+from sqlalchemy.sql import func
+from app.db.base_class import Base
+
+class AssetCatalog(Base):
+    """Központi jármű katalógus (Admin/Bot által tölthető)"""
+    __tablename__ = "vehicle_catalog"
+    __table_args__ = {"schema": "data"}
+
+    id = Column(Integer, primary_key=True, index=True)
+    make = Column(String, index=True, nullable=False)
+    model = Column(String, index=True, nullable=False)
+    generation = Column(String)
+    year_from = Column(Integer)
+    year_to = Column(Integer)
+    vehicle_class = Column(String) # land, sea, air
+    fuel_type = Column(String)
+    engine_code = Column(String)
+    
+    assets = relationship("Asset", back_populates="catalog")
+
+class Asset(Base):
+    """A Jármű Identitás (Digital Twin törzsadatok)"""
+    __tablename__ = "assets"
+    __table_args__ = {"schema": "data"}
+
+    id = Column(PG_UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    vin = Column(String(17), unique=True, index=True, nullable=False)
+    license_plate = Column(String(20), index=True)
+    name = Column(String) 
+    year_of_manufacture = Column(Integer)
+    
+    catalog_id = Column(Integer, ForeignKey("data.vehicle_catalog.id"))
+    
+    # Nemzetközi mutatók
+    quality_index = Column(Numeric(3, 2), default=1.00)
+    system_mileage = Column(Integer, default=0) 
+    mileage_unit = Column(String(10), default="km") # Nemzetközi: km, miles, hours
+    
+    is_verified = Column(Boolean, default=False)
+    status = Column(String(20), default="active")
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+    catalog = relationship("AssetCatalog", back_populates="assets")
+    assignments = relationship("AssetAssignment", back_populates="asset")
+    events = relationship("AssetEvent", back_populates="asset")
+    costs = relationship("AssetCost", back_populates="asset")
+
+class AssetAssignment(Base):
+    """Birtoklás követése (Kié a jármű és mettől meddig)"""
+    __tablename__ = "asset_assignments"
+    __table_args__ = {"schema": "data"}
+
+    id = Column(PG_UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    asset_id = Column(PG_UUID(as_uuid=True), ForeignKey("data.assets.id"), nullable=False)
+    organization_id = Column(Integer, ForeignKey("data.organizations.id"), nullable=False)
+    
+    assigned_at = Column(DateTime(timezone=True), server_default=func.now())
+    released_at = Column(DateTime(timezone=True), nullable=True)
+    
+    status = Column(String(30), default="active")
+    notes = Column(String)
+
+    asset = relationship("Asset", back_populates="assignments")
+    organization = relationship("Organization", back_populates="assets")
+
+class AssetEvent(Base):
+    """Élettörténeti események (Szerviz, km-óra állások, balesetek)"""
+    __tablename__ = "asset_events"
+    __table_args__ = {"schema": "data"}
+
+    id = Column(PG_UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    asset_id = Column(PG_UUID(as_uuid=True), ForeignKey("data.assets.id"), nullable=False)
+    
+    event_type = Column(String(50), nullable=False) 
+    event_date = Column(DateTime(timezone=True), server_default=func.now())
+    
+    recorded_mileage = Column(Integer)
+    description = Column(String)
+    data = Column(JSON, server_default=text("'{}'::jsonb"))
+
+    asset = relationship("Asset", back_populates="events")
+
+class AssetCost(Base):
+    """
+    Költségkezelő modell: Bruttó/Nettó/ÁFA és deviza támogatás.
+    """
+    __tablename__ = "asset_costs"
+    __table_args__ = {"schema": "data"}
+
+    id = Column(PG_UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    asset_id = Column(PG_UUID(as_uuid=True), ForeignKey("data.assets.id"), nullable=False)
+    organization_id = Column(Integer, ForeignKey("data.organizations.id"), nullable=False)
+    
+    cost_type = Column(String(50), nullable=False) # fuel, service, tax, insurance, toll
+    
+    # Pénzügyi adatok
+    amount = Column(Numeric(18, 2), nullable=False) # Bruttó összeg
+    net_amount = Column(Numeric(18, 2))             # Nettó összeg
+    vat_amount = Column(Numeric(18, 2))             # ÁFA érték
+    vat_rate = Column(Numeric(5, 2))                # ÁFA kulcs (pl. 27.00)
+    
+    # Nemzetközi deviza kezelés
+    currency = Column(String(3), default="HUF")      # Riportálási deviza
+    original_currency = Column(String(3))            # Számla eredeti devizája
+    exchange_rate_at_cost = Column(Numeric(18, 6))   # Rögzítéskori árfolyam
+    
+    date = Column(DateTime(timezone=True), server_default=func.now())
+    description = Column(String)
+    invoice_id = Column(String)
+    mileage_at_cost = Column(Integer)
+    
+    data = Column(JSON, server_default=text("'{}'::jsonb"))
+
+    asset = relationship("Asset", back_populates="costs")
+
+class ExchangeRate(Base):
+    """Napi árfolyamok tárolása (ECB/MNB adatok alapján)"""
+    __tablename__ = "exchange_rates"
+    __table_args__ = {"schema": "data"}
+
+    id = Column(Integer, primary_key=True, index=True)
+    base_currency = Column(String(3), default="EUR")
+    target_currency = Column(String(3), nullable=False)
+    rate = Column(Numeric(18, 6), nullable=False)
+    rate_date = Column(DateTime(timezone=False), index=True)
+    provider = Column(String(50), default="ECB")
+    updated_at = Column(DateTime(timezone=True), server_default=func.now())