feat: database models and Alembic migrations — User, Recording, Transcription, Protocol, PromptTemplate, ExportFile

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/models/user.py

@@ -0,0 +1,25 @@
+import enum
+
+from sqlalchemy import Boolean, Enum, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.models.base import Base, TimestampMixin, UUIDMixin
+
+
+class UserRole(str, enum.Enum):
+    admin = "admin"
+    user = "user"
+
+
+class User(UUIDMixin, TimestampMixin, Base):
+    __tablename__ = "users"
+
+    username: Mapped[str] = mapped_column(String(150), unique=True, index=True)
+    email: Mapped[str] = mapped_column(String(255), unique=True, index=True)
+    password_hash: Mapped[str] = mapped_column(String(255))
+    role: Mapped[UserRole] = mapped_column(
+        Enum(UserRole), default=UserRole.user
+    )
+    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
+
+    recordings: Mapped[list["Recording"]] = relationship(back_populates="user")