Add reference data models and seed data for incoterms, invoice types, material types, payment methods, pedimento codes, pedimento regimens, sectors, states, transport modes, transport types, and valuation methods

- Implemented SQLAlchemy models for incoterms, invoice types, material types, payment methods, pedimento codes, pedimento regimens, sectors, states, transport modes, transport types, and valuation methods.
- Added seed data for each reference data model to populate the database with initial values.
- Ensured primary key constraints and appropriate data types for each model.
- Established relationships where necessary, particularly in pedimento codes and regimens.

backend/api/v1/modules/public/reference_data/valuation_methods/models.py

@@ -0,0 +1,16 @@
+from sqlalchemy import String, PrimaryKeyConstraint
+from sqlalchemy.orm import mapped_column, Mapped
+from core.database import Base
+
+class ValuationMethod(Base):
+    __tablename__ = "valuation_methods" #GMetValor
+    __table_args__ = (
+        PrimaryKeyConstraint("key", name="valuation_methods_pkey"),
+        {"schema": "public"}
+    )
+
+    key: Mapped[str] = mapped_column(String(2), nullable=False)  
+    description: Mapped[str] = mapped_column(String(200), nullable=False)
+
+    def __repr__(self):
+        return f"<ValuationMethod(key={self.key}, description={self.description})>"

backend/api/v1/modules/public/reference_data/valuation_methods/seed.py

@@ -0,0 +1,9 @@
+seed = [
+    ("0", "VALOR COMERCIAL (CLAVE USADA SOLO A LA EXPORTACION)."),
+    ("1", "VALOR DE TRANSACCION DE LAS MERCANCIAS."),
+    ("2", "VALOR DE TRANSACCION DE MERCANCIAS IDENTICAS."),
+    ("3", "VALOR DE TRANSACCION DE MERCANCIAS SIMILARES."),
+    ("4", "VALOR DE PRECIO UNITARIO DE VENTA."),
+    ("5", "VALOR RECONSTRUIDO."),
+    ("6", "ULTIMO RECURSO"),
+]