Full app rebuild: FastAPI backend + React Native mobile with auth, championships, admin

Backend (FastAPI + SQLAlchemy + SQLite):
- JWT auth with access/refresh tokens, bcrypt password hashing
- User model with member/organizer/admin roles, auto-approve members
- Championship, Registration, ParticipantList, Notification models
- Alembic async migrations, seed data with test users
- Registration endpoint returns tokens for members, pending for organizers
- /registrations/my returns championship title/date/location via eager loading
- Admin endpoints: list users, approve/reject organizers

Mobile (React Native + Expo + TypeScript):
- Zustand auth store, Axios client with token refresh interceptor
- Role-based registration (Member vs Organizer) with contextual form labels
- Tab navigation with Ionicons, safe area headers, admin tab for admin role
- Championships list with status badges, detail screen with registration progress
- My Registrations with championship title, progress bar, and tap-to-navigate
- Admin panel with pending/all filter, approve/reject with confirmation
- Profile screen with role badge, Ionicons info rows, sign out
- Password visibility toggle (Ionicons), keyboard flow hints (returnKeyType)

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

backend/app/models/championship.py

@@ -0,0 +1,42 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, Float, Integer, String, Text, Uuid, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.database import Base
+
+
+class Championship(Base):
+    __tablename__ = "championships"
+
+    id: Mapped[uuid.UUID] = mapped_column(Uuid(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    title: Mapped[str] = mapped_column(String(255), nullable=False)
+    description: Mapped[str | None] = mapped_column(Text)
+    location: Mapped[str | None] = mapped_column(String(500))
+    event_date: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    registration_open_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    registration_close_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+
+    # Extended fields
+    form_url: Mapped[str | None] = mapped_column(String(2048))
+    entry_fee: Mapped[float | None] = mapped_column(Float)
+    video_max_duration: Mapped[int | None] = mapped_column(Integer)  # seconds
+    judges: Mapped[str | None] = mapped_column(Text)       # JSON string: [{name, bio, instagram}]
+    categories: Mapped[str | None] = mapped_column(Text)  # JSON string: [str]
+
+    # Status: 'draft' | 'open' | 'closed' | 'completed'
+    status: Mapped[str] = mapped_column(String(20), nullable=False, default="draft")
+    # Source: 'manual' | 'instagram'
+    source: Mapped[str] = mapped_column(String(20), nullable=False, default="manual")
+    instagram_media_id: Mapped[str | None] = mapped_column(String(255), unique=True)
+    image_url: Mapped[str | None] = mapped_column(String(2048))
+    raw_caption_text: Mapped[str | None] = mapped_column(Text)
+
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+
+    registrations: Mapped[list["Registration"]] = relationship(back_populates="championship", cascade="all, delete-orphan")  # type: ignore[name-defined]
+    participant_list: Mapped["ParticipantList | None"] = relationship(back_populates="championship", uselist=False, cascade="all, delete-orphan")  # type: ignore[name-defined]