Vela Platform v2: single monolith, real P&L, bilingual marketing site

models.py

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+"""Vela Platform — SQLAlchemy models."""
+from datetime import datetime, timezone
+
+from sqlalchemy import (
+    Boolean,
+    Column,
+    DateTime,
+    Float,
+    ForeignKey,
+    Integer,
+    String,
+    Text,
+    UniqueConstraint,
+    create_engine,
+)
+from sqlalchemy.orm import DeclarativeBase, relationship
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    email = Column(String(255), unique=True, nullable=False)
+    password_hash = Column(String(255), nullable=False)
+    active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+
+
+class Service(Base):
+    __tablename__ = "services"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    name = Column(String(100), unique=True, nullable=False)
+    description = Column(Text, default="")
+    sell_price = Column(Float, default=0.0)
+    cost_price = Column(Float, default=0.0)  # sum of component unit_cost * quantity
+    active = Column(Boolean, default=True, nullable=False)
+    sort_order = Column(Integer, default=0)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc),
+                        onupdate=lambda: datetime.now(timezone.utc))
+
+    components = relationship("ServiceComponent", back_populates="service",
+                              cascade="all, delete-orphan")
+
+
+class ServiceComponent(Base):
+    __tablename__ = "service_components"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    service_id = Column(Integer, ForeignKey("services.id", ondelete="CASCADE"), nullable=False)
+    name = Column(String(100), nullable=False)
+    unit_cost = Column(Float, default=0.0)
+    unit_sell = Column(Float, default=0.0)
+    quantity = Column(Integer, default=1)
+    notes = Column(Text, default="")
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+
+    service = relationship("Service", back_populates="components")
+
+
+class Transaction(Base):
+    """Frozen transaction — snapshots prices at time of sale."""
+    __tablename__ = "transactions"
+    __table_args__ = (
+        UniqueConstraint("source_type", "source_id", name="uq_transaction_source"),
+    )
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    source_type = Column(String(20), default="manual")  # "manual" or "order"
+    source_id = Column(Integer, nullable=True)
+
+    service_id = Column(Integer, ForeignKey("services.id"), nullable=True)
+    service_name_snapshot = Column(String(100), nullable=False)
+    quantity = Column(Integer, default=1)
+
+    unit_sell_price_snapshot = Column(Float, nullable=False)
+    unit_cost_snapshot = Column(Float, nullable=False)
+    revenue_total = Column(Float, nullable=False)
+    cogs_total = Column(Float, nullable=False)
+    gross_profit_total = Column(Float, nullable=False)
+
+    month_start_date = Column(String(10), nullable=False)  # "2026-06"
+
+    payment_status = Column(String(20), default="unpaid")  # unpaid, partial, paid, refunded
+    notes = Column(Text, default="")
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+
+
+class Expense(Base):
+    __tablename__ = "expenses"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    name = Column(String(200), nullable=False)
+    amount = Column(Float, nullable=False)
+    category = Column(String(100), default="general")
+    month_start_date = Column(String(10), nullable=False)  # "2026-06"
+    notes = Column(Text, default="")
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+    deleted_at = Column(DateTime, nullable=True)
+
+
+class ExpenseTemplate(Base):
+    """Recurring expense templates — generate actual expenses each month."""
+    __tablename__ = "expense_templates"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    name = Column(String(200), nullable=False)
+    amount = Column(Float, nullable=False)
+    category = Column(String(100), default="general")
+    active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))