feat: Implement single sync job management and progress tracking

backend/tests/unit/test_sync_job.py

@@ -0,0 +1,27 @@
+from datetime import datetime
+
+from backend.src.models.sync_job import SyncJob
+
+
+def test_sync_job_defaults():
+    job = SyncJob()
+    assert job.status == "pending"
+    assert job.progress == 0.0
+    assert job.start_time is None
+    assert job.end_time is None
+    assert job.error_message is None
+    assert job.job_type is None
+
+
+def test_sync_job_with_values():
+    start_time = datetime.now()
+    job = SyncJob(
+        status="in_progress",
+        progress=0.5,
+        start_time=start_time,
+        job_type="activities",
+    )
+    assert job.status == "in_progress"
+    assert job.progress == 0.5
+    assert job.start_time == start_time
+    assert job.job_type == "activities"