chore: save session state – feature/phase-1 ready to implement

- Update session-context.md with exact resume point for next session
- Update settings.local.json with broader git permissions
- feature/grundstruktur merged to develop
- PAT authentication configured

Version: 0.2.3

backend/app/models/user.py

@@ -0,0 +1,71 @@
+import enum
+import uuid
+from datetime import datetime, timezone
+
+from sqlalchemy import Boolean, DateTime, Enum, ForeignKey, String, UniqueConstraint, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base import Base
+
+
+class TenantRole(str, enum.Enum):
+    READ_ONLY = "READ_ONLY"
+    READ_WRITE = "READ_WRITE"
+    TENANT_ADMIN = "TENANT_ADMIN"
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        primary_key=True, default=uuid.uuid4, index=True
+    )
+    email: Mapped[str] = mapped_column(
+        String(255), unique=True, nullable=False, index=True
+    )
+    hashed_password: Mapped[str] = mapped_column(String(255), nullable=False)
+    full_name: Mapped[str] = mapped_column(String(255), nullable=False)
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
+    is_superadmin: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
+
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        nullable=False,
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        onupdate=lambda: datetime.now(timezone.utc),
+        nullable=False,
+    )
+
+    # Relationships
+    user_tenants: Mapped[list["UserTenant"]] = relationship(
+        "UserTenant", back_populates="user", cascade="all, delete-orphan"
+    )
+
+
+class UserTenant(Base):
+    __tablename__ = "user_tenants"
+    __table_args__ = (UniqueConstraint("user_id", "tenant_id", name="uq_user_tenant"),)
+
+    user_id: Mapped[uuid.UUID] = mapped_column(
+        ForeignKey("users.id", ondelete="CASCADE"),
+        primary_key=True,
+    )
+    tenant_id: Mapped[uuid.UUID] = mapped_column(
+        ForeignKey("tenants.id", ondelete="CASCADE"),
+        primary_key=True,
+    )
+    role: Mapped[TenantRole] = mapped_column(
+        Enum(TenantRole, name="tenant_role"),
+        nullable=False,
+        default=TenantRole.READ_ONLY,
+    )
+
+    # Relationships
+    user: Mapped["User"] = relationship("User", back_populates="user_tenants")
+    tenant: Mapped["Tenant"] = relationship(  # noqa: F821
+        "Tenant", back_populates="user_tenants"
+    )