feat(v4.5.0): Sprints & My Tasks

- New tables: sprints + sprint_pages with velocity_points
- API: CRUD sprints (list/create/update/delete)
- API: assign/remove pages to sprints
- API: burndown chart data (total/completed/remaining points, ideal line)
- 4 new tests (175 total)

tests/test_app.py

@@ -812,7 +812,7 @@ def test_my_tasks_page(client):
     assert "My Tasks" in resp.text
 
 
-def test_my_tasks_api(client):
+def test_my_tasks_cross_db(client):
     """My Tasks API returns JSON."""
     r = client.post("/db/api", json={"name": "My Project"})
     cid = r.json()["id"]
@@ -2568,4 +2568,142 @@ def test_auto_shift_no_blockers(client):
 
     resp = client.post(f"/db/{coll_id}/pages/{p.json()['id']}/auto-shift/api")
     assert resp.status_code == 200
-    assert resp.json()["shifted"] is False
+    assert resp.json()["shifted"] is False
+
+
+# ── v4.5.0: Sprints ──
+
+
+def test_sprint_crud(client):
+    """Full CRUD lifecycle for sprints."""
+    resp = client.post("/db/api", json={"name": "Sprint DB"})
+    coll_id = resp.json()["id"]
+
+    # Create
+    resp = client.post(f"/workspace/collections/{coll_id}/sprints", json={
+        "name": "Sprint 1",
+        "start_date": "2026-07-01",
+        "end_date": "2026-07-14",
+        "goal": "Ship MVP",
+        "status": "active",
+    })
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "created"
+    sid = resp.json()["id"]
+
+    # List
+    resp = client.get(f"/workspace/collections/{coll_id}/sprints")
+    assert len(resp.json()["sprints"]) == 1
+    assert resp.json()["sprints"][0]["name"] == "Sprint 1"
+
+    # Update
+    resp = client.put(f"/workspace/collections/{coll_id}/sprints/{sid}", json={
+        "name": "Sprint 1 - Revised",
+        "status": "completed",
+    })
+    assert resp.status_code == 200
+
+    resp = client.get(f"/workspace/collections/{coll_id}/sprints")
+    assert resp.json()["sprints"][0]["name"] == "Sprint 1 - Revised"
+
+    # Delete
+    resp = client.delete(f"/workspace/collections/{coll_id}/sprints/{sid}")
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "deleted"
+
+
+def test_sprint_assign_page(client):
+    """Assign a page to a sprint and remove it."""
+    resp = client.post("/db/api", json={"name": "Assign DB"})
+    coll_id = resp.json()["id"]
+
+    # Create sprint
+    resp = client.post(f"/workspace/collections/{coll_id}/sprints", json={
+        "name": "Sprint A",
+        "start_date": "2026-08-01",
+        "end_date": "2026-08-14",
+    })
+    sid = resp.json()["id"]
+
+    # Create page
+    resp = client.post(f"/db/{coll_id}/pages/api", json={"title": "Task X"})
+    pid = resp.json()["id"]
+
+    # Assign
+    resp = client.post(f"/workspace/collections/{coll_id}/sprints/{sid}/assign", json={
+        "page_id": pid,
+        "velocity_points": 5,
+    })
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "assigned"
+
+    # Verify page count
+    resp = client.get(f"/workspace/collections/{coll_id}/sprints")
+    assert resp.json()["sprints"][0]["page_count"] == 1
+
+    # Remove
+    resp = client.delete(f"/workspace/collections/{coll_id}/sprints/{sid}/assign/{pid}")
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "removed"
+
+
+def test_sprint_burndown(client):
+    """Burndown chart data calculation."""
+    resp = client.post("/db/api", json={"name": "Burndown DB"})
+    coll_id = resp.json()["id"]
+
+    resp = client.post(f"/workspace/collections/{coll_id}/sprints", json={
+        "name": "Sprint B",
+        "start_date": "2026-07-01",
+        "end_date": "2026-07-14",
+    })
+    sid = resp.json()["id"]
+
+    # Add pages with different statuses
+    p1 = client.post(f"/db/{coll_id}/pages/api", json={
+        "title": "Done Task",
+        "properties": {"Status": "Done"},
+    })
+    p2 = client.post(f"/db/{coll_id}/pages/api", json={
+        "title": "In Progress Task",
+        "properties": {"Status": "In Progress"},
+    })
+
+    client.post(f"/workspace/collections/{coll_id}/sprints/{sid}/assign", json={
+        "page_id": p1.json()["id"], "velocity_points": 3,
+    })
+    client.post(f"/workspace/collections/{coll_id}/sprints/{sid}/assign", json={
+        "page_id": p2.json()["id"], "velocity_points": 5,
+    })
+
+    resp = client.get(f"/workspace/collections/{coll_id}/sprints/burndown/{sid}")
+    assert resp.status_code == 200
+    data = resp.json()
+    assert data["total_points"] == 8
+    assert data["completed_points"] == 3
+    assert data["remaining_points"] == 5
+
+
+def test_my_tasks_page_render(client):
+    """My Tasks page renders cross-database aggregation."""
+    # Create a task collection
+    resp = client.post("/db/api", json={"name": "My Tasks DB"})
+    coll_id = resp.json()["id"]
+
+    # Toggle to task mode
+    client.put(f"/db/{coll_id}/toggle-task/api")
+
+    # Add pages
+    client.post(f"/db/{coll_id}/pages/api", json={
+        "title": "Urgent fix",
+        "properties": {"Status": "Todo"},
+    })
+    client.post(f"/db/{coll_id}/pages/api", json={
+        "title": "Deploy",
+        "properties": {"Status": "Done"},
+    })
+
+    resp = client.get("/my-tasks?view=all")
+    assert resp.status_code == 200
+    assert "Urgent fix" in resp.text
+    assert "My Tasks DB" in resp.text