feat(v4.2.0): Database Templates & Dashboards

- Enhance page_templates: add description, is_recurring, recurrence_rule columns
- New table collection_dashboards for widget-based dashboard layouts
- API: PUT/DELETE /workspace/collections/{id}/templates/page/{tid} — template CRUD
- API: CRUD /workspace/collections/{id}/dashboards (create/list/update/delete)
- Dashboard layout_json supports columns + widgets with view_id/x/y/w/h
- 6 new tests (159 total)

tests/test_app.py

@@ -2228,3 +2228,150 @@ def test_remove_data_source_not_found(client):
 
     resp = client.delete(f"/db/{coll_id}/sources/99999/api")
     assert resp.status_code == 404
+
+
+# ── v4.2.0: Templates & Dashboards ──
+
+
+def test_page_template_update(client):
+    """Update a page template with recurrence settings."""
+    resp = client.post("/db/api", json={"name": "Template Update DB"})
+    coll_id = resp.json()["id"]
+
+    resp = client.post(f"/workspace/collections/{coll_id}/templates/page", json={
+        "name": "Weekly Report",
+        "properties": {"Status": "Todo", "Priority": "P1"},
+    })
+    assert resp.status_code == 200
+    tid = resp.json()["id"]
+
+    resp = client.put(f"/workspace/collections/{coll_id}/templates/page/{tid}", json={
+        "name": "Weekly Report v2",
+        "description": "Updated weekly report template",
+        "is_recurring": True,
+        "recurrence_rule": "weekly",
+        "properties": {"Status": "In Progress", "Priority": "P2"},
+    })
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "updated"
+
+    resp = client.get(f"/workspace/collections/{coll_id}/templates/page")
+    tmpls = resp.json()["templates"]
+    assert len(tmpls) == 1
+    assert tmpls[0]["name"] == "Weekly Report v2"
+    assert tmpls[0]["is_recurring"] == 1
+    assert tmpls[0]["recurrence_rule"] == "weekly"
+
+
+def test_page_template_delete(client):
+    """Delete a page template."""
+    resp = client.post("/db/api", json={"name": "Template Delete DB"})
+    coll_id = resp.json()["id"]
+
+    resp = client.post(f"/workspace/collections/{coll_id}/templates/page", json={
+        "name": "To Delete",
+    })
+    tid = resp.json()["id"]
+
+    resp = client.delete(f"/workspace/collections/{coll_id}/templates/page/{tid}")
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "deleted"
+
+    resp = client.get(f"/workspace/collections/{coll_id}/templates/page")
+    assert len(resp.json()["templates"]) == 0
+
+
+def test_page_template_apply_with_content(client):
+    """Apply a page template that has content_json."""
+    resp = client.post("/db/api", json={"name": "Content Template DB"})
+    coll_id = resp.json()["id"]
+
+    resp = client.post(f"/workspace/collections/{coll_id}/templates/page", json={
+        "name": "Meeting Notes",
+        "properties": {"Status": "Todo"},
+        "content": [{"type": "heading", "text": "Meeting Notes"}],
+    })
+    tid = resp.json()["id"]
+
+    resp = client.post(f"/workspace/collections/{coll_id}/templates/page/{tid}/apply", json={
+        "title": "Sprint Review 2026-07-21",
+    })
+    assert resp.status_code == 200
+    page_id = resp.json()["id"]
+
+    resp = client.get(f"/db/pages/{page_id}/api")
+    assert resp.status_code == 200
+    assert resp.json()["title"] == "Sprint Review 2026-07-21"
+
+
+def test_dashboard_crud(client):
+    """Full CRUD lifecycle for dashboards."""
+    resp = client.post("/db/api", json={"name": "Dashboard CRUD DB"})
+    coll_id = resp.json()["id"]
+
+    resp = client.post(f"/workspace/collections/{coll_id}/dashboards", json={
+        "name": "Project Dashboard",
+        "layout": {
+            "columns": 2,
+            "widgets": [
+                {"view_id": 1, "x": 0, "y": 0, "width": 1, "height": 1},
+                {"view_id": 2, "x": 1, "y": 0, "width": 1, "height": 1},
+            ],
+        },
+    })
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "created"
+    did = resp.json()["id"]
+
+    resp = client.get(f"/workspace/collections/{coll_id}/dashboards")
+    dashboards = resp.json()["dashboards"]
+    assert len(dashboards) == 1
+    assert dashboards[0]["name"] == "Project Dashboard"
+
+    resp = client.put(f"/workspace/collections/{coll_id}/dashboards/{did}", json={
+        "name": "Project Dashboard v2",
+        "layout": {"columns": 3, "widgets": []},
+    })
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "updated"
+
+    resp = client.get(f"/workspace/collections/{coll_id}/dashboards")
+    assert resp.json()["dashboards"][0]["name"] == "Project Dashboard v2"
+
+    resp = client.delete(f"/workspace/collections/{coll_id}/dashboards/{did}")
+    assert resp.status_code == 200
+    assert resp.json()["status"] == "deleted"
+
+    resp = client.get(f"/workspace/collections/{coll_id}/dashboards")
+    assert len(resp.json()["dashboards"]) == 0
+
+
+def test_template_recurrence_defaults(client):
+    """New templates default to non-recurring with empty recurrence_rule."""
+    resp = client.post("/db/api", json={"name": "Recur Defaults DB"})
+    coll_id = resp.json()["id"]
+
+    resp = client.post(f"/workspace/collections/{coll_id}/templates/page", json={
+        "name": "Default Template",
+    })
+    resp = client.get(f"/workspace/collections/{coll_id}/templates/page")
+    tmpl = resp.json()["templates"][0]
+    assert tmpl["is_recurring"] == 0
+    assert tmpl["recurrence_rule"] == ""
+
+
+def test_dashboard_create_default_layout(client):
+    """Dashboard creation with no layout parameter gets default grid."""
+    resp = client.post("/db/api", json={"name": "Default Layout DB"})
+    coll_id = resp.json()["id"]
+
+    resp = client.post(f"/workspace/collections/{coll_id}/dashboards", json={
+        "name": "Auto Layout",
+    })
+    assert resp.status_code == 200
+
+    resp = client.get(f"/workspace/collections/{coll_id}/dashboards")
+    dash = resp.json()["dashboards"][0]
+    layout = json.loads(dash["layout_json"])
+    assert layout["columns"] == 1
+    assert layout["widgets"] == []