diff --git a/backend/app/models/vehicle.py b/backend/app/models/vehicle.py
new file mode 100644
index 0000000..d7a6fc4
--- /dev/null
+++ b/backend/app/models/vehicle.py
@@ -0,0 +1,100 @@
+from datetime import datetime, date, timezone
+from decimal import Decimal
+from sqlalchemy import (
+    String, Boolean, Date, DateTime, DECIMAL, Integer, SmallInteger,
+    ForeignKey, Text, JSON
+)
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from app.core.database import Base
+
+
+class VehicleRegistry(Base):
+    __tablename__ = "vehicle_registry"
+
+    plate: Mapped[str] = mapped_column(String(10), primary_key=True)
+    vin: Mapped[str | None] = mapped_column(String(17))
+    vehicle_type: Mapped[str | None] = mapped_column(String(50))
+    registration_date: Mapped[date | None] = mapped_column(Date)
+    homologation_code: Mapped[str | None] = mapped_column(String(50))
+    engine_code: Mapped[str | None] = mapped_column(String(20))
+    last_revision_date: Mapped[date | None] = mapped_column(Date)
+    foreign_plate: Mapped[str | None] = mapped_column(String(20))
+    foreign_registration_date: Mapped[date | None] = mapped_column(Date)
+    foreign_country: Mapped[str | None] = mapped_column(String(50))
+    is_foreign_registered: Mapped[bool | None] = mapped_column(Boolean)
+    source: Mapped[str | None] = mapped_column(String(20))
+    raw_response: Mapped[dict | None] = mapped_column(JSON)
+    fetched_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    selected_motornet_code: Mapped[str | None] = mapped_column(String(20))
+
+    version_candidates: Mapped[list["PlateVersionCandidate"]] = relationship(
+        "PlateVersionCandidate", back_populates="registry"
+    )
+
+
+class VehicleVersion(Base):
+    __tablename__ = "vehicle_versions"
+
+    motornet_code: Mapped[str] = mapped_column(String(20), primary_key=True)
+    brand_acronym: Mapped[str | None] = mapped_column(String(10))
+    brand_name: Mapped[str | None] = mapped_column(String(50))
+    model_code: Mapped[str | None] = mapped_column(String(10))
+    model_description: Mapped[str | None] = mapped_column(String(100))
+    gamma_code: Mapped[str | None] = mapped_column(String(10))
+    gamma_description: Mapped[str | None] = mapped_column(String(100))
+    series_code: Mapped[str | None] = mapped_column(String(10))
+    series_description: Mapped[str | None] = mapped_column(String(100))
+    historical_group_code: Mapped[str | None] = mapped_column(String(10))
+    historical_group_desc: Mapped[str | None] = mapped_column(String(100))
+    cod_desc_model_code: Mapped[str | None] = mapped_column(String(10))
+    cod_desc_model_desc: Mapped[str | None] = mapped_column(String(100))
+    version_label: Mapped[str | None] = mapped_column(String(200))
+    body_type: Mapped[str | None] = mapped_column(String(10))
+    doors: Mapped[int | None] = mapped_column(SmallInteger)
+    wheelbase: Mapped[int | None] = mapped_column(SmallInteger)
+    list_price: Mapped[Decimal | None] = mapped_column(DECIMAL(10, 2))
+    production_start: Mapped[date | None] = mapped_column(Date)
+    production_end: Mapped[date | None] = mapped_column(Date)
+    commercial_start: Mapped[date | None] = mapped_column(Date)
+    commercial_end: Mapped[date | None] = mapped_column(Date)
+    first_seen_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    last_seen_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    seen_count: Mapped[int] = mapped_column(Integer, default=1)
+    source: Mapped[str | None] = mapped_column(String(20))
+
+    plate_candidates: Mapped[list["PlateVersionCandidate"]] = relationship(
+        "PlateVersionCandidate", back_populates="version"
+    )
+
+
+class PlateVersionCandidate(Base):
+    __tablename__ = "plate_version_candidates"
+
+    plate: Mapped[str] = mapped_column(
+        String(10), ForeignKey("vehicle_registry.plate"), primary_key=True
+    )
+    motornet_code: Mapped[str] = mapped_column(
+        String(20), ForeignKey("vehicle_versions.motornet_code"), primary_key=True
+    )
+    is_selected: Mapped[bool] = mapped_column(Boolean, default=False)
+
+    registry: Mapped["VehicleRegistry"] = relationship(
+        "VehicleRegistry", back_populates="version_candidates"
+    )
+    version: Mapped["VehicleVersion"] = relationship(
+        "VehicleVersion", back_populates="plate_candidates"
+    )
+
+
+class ApiUsageLog(Base):
+    __tablename__ = "api_usage_log"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    source: Mapped[str | None] = mapped_column(String(20))
+    plate: Mapped[str | None] = mapped_column(String(10))
+    hit_cache: Mapped[bool] = mapped_column(Boolean, default=False)
+    remaining_queries: Mapped[int | None] = mapped_column(Integer)
+    called_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
+    )