Phase 3: Outcome storage

- Add RandomNumberOutcome model to models.py
- Update worker.py to execute job logic:
  - Generate random number 0-100
  - Record execution duration
  - Store outcome in database
- Add test_jobs.py with unit tests for job handler logic

backend/models.py

@@ -351,3 +351,24 @@ class Appointment(Base):
     cancelled_at: Mapped[datetime | None] = mapped_column(
         DateTime(timezone=True), nullable=True
     )
+
+
+class RandomNumberOutcome(Base):
+    """Outcome of a random number job execution."""
+
+    __tablename__ = "random_number_outcomes"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    job_id: Mapped[int] = mapped_column(Integer, nullable=False, index=True)
+    triggered_by_user_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("users.id"), nullable=False, index=True
+    )
+    triggered_by: Mapped[User] = relationship(
+        "User", foreign_keys=[triggered_by_user_id], lazy="joined"
+    )
+    value: Mapped[int] = mapped_column(Integer, nullable=False)
+    duration_ms: Mapped[int] = mapped_column(Integer, nullable=False)
+    status: Mapped[str] = mapped_column(String(20), nullable=False, default="completed")
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=lambda: datetime.now(UTC)
+    )