feat: full backend (untested)

backend/src/app/models.py

@@ -0,0 +1,40 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, String, Text
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class Participant(Base):
+    __tablename__ = "participants"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    name: Mapped[str] = mapped_column(String(255), nullable=False)
+    email: Mapped[str] = mapped_column(String(255), nullable=False, unique=True)
+    ics_url: Mapped[str] = mapped_column(Text, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime, default=datetime.utcnow, nullable=False
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False
+    )
+
+
+class BusyBlock(Base):
+    __tablename__ = "busy_blocks"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    participant_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), nullable=False, index=True
+    )
+    start_time: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
+    end_time: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)