fix: handle 'skipped' status in job_detail_status updates

- Add 'skipped' to terminal states in update_job_detail_status()
- Ensures skipped dates properly:
  - Update status and completed_at timestamp
  - Store skip reason in error field
  - Trigger job completion checks
- Add comprehensive test suite (11 tests) covering:
  - Database schema validation
  - Job completion with skipped dates
  - Progress tracking with skip counts
  - Multi-model skip handling
  - Skip reason storage

Bug was discovered via TDD - created tests first, which revealed
that skipped status wasn't being handled in the terminal state
block at line 397.

All 11 tests passing.

api/job_manager.py

@@ -394,7 +394,7 @@ class JobManager:
                     WHERE job_id = ? AND status = 'pending'
                 """, (updated_at, updated_at, job_id))
 
-            elif status in ("completed", "failed"):
+            elif status in ("completed", "failed", "skipped"):
                 # Calculate duration for detail
                 cursor.execute("""
                     SELECT started_at FROM job_details

tests/unit/test_job_skip_status.py

@@ -0,0 +1,349 @@
+"""
+Tests for job skip status tracking functionality.
+
+Tests the skip status feature that marks dates as skipped when they:
+1. Have incomplete price data (weekends/holidays)
+2. Are already completed from a previous job run
+
+Tests also verify that jobs complete properly when all dates are in
+terminal states (completed/failed/skipped).
+"""
+
+import pytest
+import tempfile
+from pathlib import Path
+
+from api.job_manager import JobManager
+from api.database import initialize_database
+
+
+@pytest.fixture
+def temp_db():
+    """Create temporary database for testing."""
+    with tempfile.NamedTemporaryFile(suffix='.db', delete=False) as f:
+        db_path = f.name
+
+    initialize_database(db_path)
+    yield db_path
+
+    Path(db_path).unlink(missing_ok=True)
+
+
+@pytest.fixture
+def job_manager(temp_db):
+    """Create JobManager with temporary database."""
+    return JobManager(db_path=temp_db)
+
+
+class TestSkipStatusDatabase:
+    """Test that database accepts 'skipped' status."""
+
+    def test_skipped_status_allowed_in_job_details(self, job_manager):
+        """Test job_details accepts 'skipped' status without constraint violation."""
+        # Create job
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01", "2025-10-02"],
+            models=["test-model"]
+        )
+
+        # Mark a detail as skipped - should not raise constraint violation
+        job_manager.update_job_detail_status(
+            job_id=job_id,
+            date="2025-10-01",
+            model="test-model",
+            status="skipped",
+            error="Test skip reason"
+        )
+
+        # Verify status was set
+        details = job_manager.get_job_details(job_id)
+        assert len(details) == 2
+        skipped_detail = next(d for d in details if d["date"] == "2025-10-01")
+        assert skipped_detail["status"] == "skipped"
+        assert skipped_detail["error"] == "Test skip reason"
+
+
+class TestJobCompletionWithSkipped:
+    """Test that jobs complete when skipped dates are counted."""
+
+    def test_job_completes_with_all_dates_skipped(self, job_manager):
+        """Test job transitions to completed when all dates are skipped."""
+        # Create job with 3 dates
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01", "2025-10-02", "2025-10-03"],
+            models=["test-model"]
+        )
+
+        # Mark all as skipped
+        for date in ["2025-10-01", "2025-10-02", "2025-10-03"]:
+            job_manager.update_job_detail_status(
+                job_id=job_id,
+                date=date,
+                model="test-model",
+                status="skipped",
+                error="Incomplete price data"
+            )
+
+        # Verify job completed
+        job = job_manager.get_job(job_id)
+        assert job["status"] == "completed"
+        assert job["completed_at"] is not None
+
+    def test_job_completes_with_mixed_completed_and_skipped(self, job_manager):
+        """Test job completes when some dates completed, some skipped."""
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01", "2025-10-02", "2025-10-03"],
+            models=["test-model"]
+        )
+
+        # Mark some completed, some skipped
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-01", model="test-model",
+            status="completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-02", model="test-model",
+            status="skipped", error="Already completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-03", model="test-model",
+            status="skipped", error="Incomplete price data"
+        )
+
+        # Verify job completed
+        job = job_manager.get_job(job_id)
+        assert job["status"] == "completed"
+
+    def test_job_partial_with_mixed_completed_failed_skipped(self, job_manager):
+        """Test job status 'partial' when some failed, some completed, some skipped."""
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01", "2025-10-02", "2025-10-03"],
+            models=["test-model"]
+        )
+
+        # Mix of statuses
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-01", model="test-model",
+            status="completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-02", model="test-model",
+            status="failed", error="Execution error"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-03", model="test-model",
+            status="skipped", error="Incomplete price data"
+        )
+
+        # Verify job status is partial
+        job = job_manager.get_job(job_id)
+        assert job["status"] == "partial"
+
+    def test_job_remains_running_with_pending_dates(self, job_manager):
+        """Test job stays running when some dates are still pending."""
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01", "2025-10-02", "2025-10-03"],
+            models=["test-model"]
+        )
+
+        # Only mark some as terminal states
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-01", model="test-model",
+            status="completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-02", model="test-model",
+            status="skipped", error="Already completed"
+        )
+        # Leave 2025-10-03 as pending
+
+        # Verify job still running (not completed)
+        job = job_manager.get_job(job_id)
+        assert job["status"] == "pending"  # Not yet marked as running
+        assert job["completed_at"] is None
+
+
+class TestProgressTrackingWithSkipped:
+    """Test progress tracking includes skipped counts."""
+
+    def test_progress_includes_skipped_count(self, job_manager):
+        """Test get_job_progress returns skipped count."""
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01", "2025-10-02", "2025-10-03", "2025-10-04"],
+            models=["test-model"]
+        )
+
+        # Set various statuses
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-01", model="test-model",
+            status="completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-02", model="test-model",
+            status="skipped", error="Already completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-03", model="test-model",
+            status="skipped", error="Incomplete price data"
+        )
+        # Leave 2025-10-04 pending
+
+        # Check progress
+        progress = job_manager.get_job_progress(job_id)
+
+        assert progress["total_model_days"] == 4
+        assert progress["completed"] == 1
+        assert progress["failed"] == 0
+        assert progress["pending"] == 1
+        assert progress["skipped"] == 2
+
+    def test_progress_all_skipped(self, job_manager):
+        """Test progress when all dates are skipped."""
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01", "2025-10-02"],
+            models=["test-model"]
+        )
+
+        # Mark all as skipped
+        for date in ["2025-10-01", "2025-10-02"]:
+            job_manager.update_job_detail_status(
+                job_id=job_id, date=date, model="test-model",
+                status="skipped", error="Incomplete price data"
+            )
+
+        progress = job_manager.get_job_progress(job_id)
+
+        assert progress["skipped"] == 2
+        assert progress["completed"] == 0
+        assert progress["pending"] == 0
+        assert progress["failed"] == 0
+
+
+class TestMultiModelSkipHandling:
+    """Test skip status with multiple models having different completion states."""
+
+    def test_different_models_different_skip_states(self, job_manager):
+        """Test that different models can have different skip states for same date."""
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01", "2025-10-02"],
+            models=["model-a", "model-b"]
+        )
+
+        # Model A: 10/1 skipped (already completed), 10/2 completed
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-01", model="model-a",
+            status="skipped", error="Already completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-02", model="model-a",
+            status="completed"
+        )
+
+        # Model B: both dates completed
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-01", model="model-b",
+            status="completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-02", model="model-b",
+            status="completed"
+        )
+
+        # Verify details
+        details = job_manager.get_job_details(job_id)
+
+        model_a_10_01 = next(
+            d for d in details
+            if d["model"] == "model-a" and d["date"] == "2025-10-01"
+        )
+        model_b_10_01 = next(
+            d for d in details
+            if d["model"] == "model-b" and d["date"] == "2025-10-01"
+        )
+
+        assert model_a_10_01["status"] == "skipped"
+        assert model_a_10_01["error"] == "Already completed"
+        assert model_b_10_01["status"] == "completed"
+        assert model_b_10_01["error"] is None
+
+    def test_job_completes_with_per_model_skips(self, job_manager):
+        """Test job completes when different models have different skip patterns."""
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01", "2025-10-02"],
+            models=["model-a", "model-b"]
+        )
+
+        # Model A: one skipped, one completed
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-01", model="model-a",
+            status="skipped", error="Already completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-02", model="model-a",
+            status="completed"
+        )
+
+        # Model B: both completed
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-01", model="model-b",
+            status="completed"
+        )
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-02", model="model-b",
+            status="completed"
+        )
+
+        # Job should complete
+        job = job_manager.get_job(job_id)
+        assert job["status"] == "completed"
+
+        # Progress should show mixed counts
+        progress = job_manager.get_job_progress(job_id)
+        assert progress["completed"] == 3
+        assert progress["skipped"] == 1
+        assert progress["total_model_days"] == 4
+
+
+class TestSkipReasons:
+    """Test that skip reasons are properly stored and retrievable."""
+
+    def test_skip_reason_already_completed(self, job_manager):
+        """Test 'Already completed' skip reason is stored."""
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-01"],
+            models=["test-model"]
+        )
+
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-01", model="test-model",
+            status="skipped", error="Already completed"
+        )
+
+        details = job_manager.get_job_details(job_id)
+        assert details[0]["error"] == "Already completed"
+
+    def test_skip_reason_incomplete_price_data(self, job_manager):
+        """Test 'Incomplete price data' skip reason is stored."""
+        job_id = job_manager.create_job(
+            config_path="test_config.json",
+            date_range=["2025-10-04"],
+            models=["test-model"]
+        )
+
+        job_manager.update_job_detail_status(
+            job_id=job_id, date="2025-10-04", model="test-model",
+            status="skipped", error="Incomplete price data"
+        )
+
+        details = job_manager.get_job_details(job_id)
+        assert details[0]["error"] == "Incomplete price data"