fix(dashboard): split trends into 3 pages + fix chart dimensions

Dashboard was a single page — 30+ widgets + tiny charts competing for
space. Trends were invisible or very small (width/height both "0"
meant "inherit from group" which gave near-zero chart area).

Split into 3 dashboard pages:
  1. Control — Process Demand, Station Controls, MGC/Basin status,
     per-pump panels (unchanged, just moved off trend groups)
  2. Trends — 10 min — rolling 10-minute flow + power charts with
     width=12 (full group), height=8 (tall charts), 300 max points
  3. Trends — 1 hour — same layout with 60-minute window, 1800 points

All 3 pages auto-nav via the FlowFuse sidebar. Same data feed: the
per-pump trend_split function now wires to 4 charts (2 outputs × 2
pages) instead of 2.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

examples/pumpingstation-3pumps-dashboard/build_flow.py

@@ -165,15 +165,31 @@ def dashboard_scaffold():
             "groupGap": "12px", "groupBorderRadius": "6px", "widgetGap": "8px",
         },
     }
-    page = {
-        "id": "ui_page_ps_demo", "type": "ui-page",
-        "name": "Pumping Station — 3 Pumps", "ui": "ui_base_ps_demo",
+    page_control = {
+        "id": "ui_page_control", "type": "ui-page",
+        "name": "Control", "ui": "ui_base_ps_demo",
         "path": "/pumping-station-demo", "icon": "water_pump",
         "layout": "grid", "theme": "ui_theme_ps_demo",
         "breakpoints": [{"name": "Default", "px": "0", "cols": "12"}],
         "order": 1, "className": "",
     }
-    return [base, theme, page]
+    page_short = {
+        "id": "ui_page_short_trends", "type": "ui-page",
+        "name": "Trends — 10 min", "ui": "ui_base_ps_demo",
+        "path": "/pumping-station-demo/trends-short", "icon": "show_chart",
+        "layout": "grid", "theme": "ui_theme_ps_demo",
+        "breakpoints": [{"name": "Default", "px": "0", "cols": "12"}],
+        "order": 2, "className": "",
+    }
+    page_long = {
+        "id": "ui_page_long_trends", "type": "ui-page",
+        "name": "Trends — 1 hour", "ui": "ui_base_ps_demo",
+        "path": "/pumping-station-demo/trends-long", "icon": "timeline",
+        "layout": "grid", "theme": "ui_theme_ps_demo",
+        "breakpoints": [{"name": "Default", "px": "0", "cols": "12"}],
+        "order": 3, "className": "",
+    }
+    return [base, theme, page_control, page_short, page_long]
 
 
 def ui_group(group_id, name, page_id, width=6, order=1):
@@ -241,19 +257,33 @@ def ui_switch(node_id, tab, x, y, group, name, label, on_value, off_value,
     }
 
 
-def ui_chart(node_id, tab, x, y, group, name, label, ymin=None, ymax=None):
+def ui_chart(node_id, tab, x, y, group, name, label,
+             width="12", height="6",
+             remove_older="10", remove_older_unit="60",
+             remove_older_points="200",
+             ymin=None, ymax=None, order=1):
+    """
+    FlowFuse ui-chart. Dimensions are in grid units:
+      width="12"  = full group width
+      height="6"  = about 300 px tall
+    `remove_older` + `remove_older_unit` define the rolling window
+    (e.g. "10" + "60" = 10 minutes). `remove_older_points` caps points
+    per series.
+    """
     return {
         "id": node_id, "type": "ui-chart", "z": tab, "group": group,
-        "name": name, "label": label, "order": 1, "chartType": "line",
+        "name": name, "label": label, "order": order, "chartType": "line",
         "category": "topic", "categoryType": "msg",
         "xAxisLabel": "", "xAxisType": "time", "xAxisTimeFormat": "auto",
         "yAxisLabel": "", "ymin": "" if ymin is None else str(ymin),
         "ymax": "" if ymax is None else str(ymax),
         "action": "append", "pointShape": "circle", "pointRadius": 2,
-        "showLegend": True, "removeOlder": "10", "removeOlderUnit": "60",
-        "removeOlderPoints": "200", "colors": [], "textColor": [],
-        "textColorDefault": True,
-        "width": "0", "height": "0", "className": "",
+        "showLegend": True,
+        "removeOlder": str(remove_older),
+        "removeOlderUnit": str(remove_older_unit),
+        "removeOlderPoints": str(remove_older_points),
+        "colors": [], "textColor": [], "textColorDefault": True,
+        "width": str(width), "height": str(height), "className": "",
         "x": x, "y": y,
         "wires": [[]],
     }
@@ -615,13 +645,19 @@ def build_ui_tab():
 
     # Dashboard scaffold (page + theme + base) + groups
     nodes += dashboard_scaffold()
-    PG = "ui_page_ps_demo"
+    PG = "ui_page_control"    # control page is the main page
     g_demand   = "ui_grp_demand"
     g_station  = "ui_grp_station"
     g_pump_a   = "ui_grp_pump_a"
     g_pump_b   = "ui_grp_pump_b"
     g_pump_c   = "ui_grp_pump_c"
-    g_trend    = "ui_grp_trend"
+    # Trend groups live on separate pages, not the control page.
+    PG_SHORT = "ui_page_short_trends"
+    PG_LONG  = "ui_page_long_trends"
+    g_trend_short_flow  = "ui_grp_trend_short_flow"
+    g_trend_short_power = "ui_grp_trend_short_power"
+    g_trend_long_flow   = "ui_grp_trend_long_flow"
+    g_trend_long_power  = "ui_grp_trend_long_power"
     g_mgc      = "ui_grp_mgc"
     g_ps       = "ui_grp_ps"
     nodes += [
@@ -632,7 +668,11 @@ def build_ui_tab():
         ui_group(g_pump_a,  "4a. Pump A",         PG, width=4,  order=5),
         ui_group(g_pump_b,  "4b. Pump B",         PG, width=4,  order=6),
         ui_group(g_pump_c,  "4c. Pump C",         PG, width=4,  order=7),
-        ui_group(g_trend,   "5. Trends",          PG, width=12, order=8),
+        # Trends on separate pages
+        ui_group(g_trend_short_flow,  "Flow (10 min)",  PG_SHORT, width=12, order=1),
+        ui_group(g_trend_short_power, "Power (10 min)", PG_SHORT, width=12, order=2),
+        ui_group(g_trend_long_flow,   "Flow (1 hour)",  PG_LONG,  width=12, order=1),
+        ui_group(g_trend_long_power,  "Power (1 hour)", PG_LONG,  width=12, order=2),
     ]
 
     nodes.append(comment("c_ui_title", TAB_UI, LANE_X[2], 20,
@@ -874,9 +914,8 @@ def build_ui_tab():
             target_in_ids=[f"lin_seq_{pump}"]
         ))
 
-        # Trend feeder — TWO outputs so flow goes to flow chart, power to
-        # power chart. Previous bug: single output → both charts saw both
-        # series and trends were unreadable.
+        # Trend feeder — 2 outputs (flow / power), each wired to BOTH
+        # the short-term and long-term chart on their respective pages.
         nodes.append(function_node(
             f"trend_split_{pump}", TAB_UI, LANE_X[3], y_p + 80,
             f"trend split ({label})",
@@ -887,22 +926,54 @@ def build_ui_tab():
             "{ topic: '" + label + "', payload: Number(p.powerNum) } : null;\n"
             "return [flowMsg, powerMsg];",
             outputs=2,
-            wires=[["trend_chart_flow"], ["trend_chart_power"]]
+            wires=[
+                ["trend_short_flow", "trend_long_flow"],
+                ["trend_short_power", "trend_long_power"],
+            ]
         ))
 
-    # Trend charts (shared across all 3 pumps)
+    # ===== Trend charts — two pages, two charts per page =====
+    # Short-term (10 min rolling window) and long-term (1 hour).
+    # Same data feed; different removeOlder settings.
     y_charts = y_pumps_start + len(PUMPS) * SECTION_GAP * 2 + 80
     nodes.append(comment("c_ui_trends", TAB_UI, LANE_X[2], y_charts,
-        "── Trends (shared by all pumps) ──",
-        "Each chart accepts msg.topic as the series name (categoryType=msg)."
+        "── Trend charts ── (feed to 4 charts on 2 pages)",
+        "Short-term (10 min) and long-term (1 h) trends share the same feed.\n"
+        "Each chart on its own page."
+    ))
+    # Short-term (10 min)
+    nodes.append(ui_chart(
+        "trend_short_flow",  TAB_UI, LANE_X[3], y_charts + 40,
+        g_trend_short_flow,
+        "Flow per pump — 10 min", "Flow per pump (m³/h)",
+        width="12", height="8",
+        remove_older="10", remove_older_unit="60", remove_older_points="300",
+        order=1,
     ))
     nodes.append(ui_chart(
-        "trend_chart_flow",  TAB_UI, LANE_X[3], y_charts + 40, g_trend,
-        "Flow per pump (m³/h)",  "Flow per pump"
+        "trend_short_power", TAB_UI, LANE_X[3], y_charts + 120,
+        g_trend_short_power,
+        "Power per pump — 10 min", "Power per pump (kW)",
+        width="12", height="8",
+        remove_older="10", remove_older_unit="60", remove_older_points="300",
+        order=1,
+    ))
+    # Long-term (1 hour)
+    nodes.append(ui_chart(
+        "trend_long_flow",   TAB_UI, LANE_X[3], y_charts + 200,
+        g_trend_long_flow,
+        "Flow per pump — 1 hour", "Flow per pump (m³/h)",
+        width="12", height="8",
+        remove_older="60", remove_older_unit="60", remove_older_points="1800",
+        order=1,
     ))
     nodes.append(ui_chart(
-        "trend_chart_power", TAB_UI, LANE_X[3], y_charts + 100, g_trend,
-        "Power per pump (kW)", "Power per pump"
+        "trend_long_power",  TAB_UI, LANE_X[3], y_charts + 280,
+        g_trend_long_power,
+        "Power per pump — 1 hour", "Power per pump (kW)",
+        width="12", height="8",
+        remove_older="60", remove_older_unit="60", remove_older_points="1800",
+        order=1,
     ))
 
     return nodes

examples/pumpingstation-3pumps-dashboard/flow.json

@@ -1126,9 +1126,9 @@
     }
   },
   {
-    "id": "ui_page_ps_demo",
+    "id": "ui_page_control",
     "type": "ui-page",
-    "name": "Pumping Station \u2014 3 Pumps",
+    "name": "Control",
     "ui": "ui_base_ps_demo",
     "path": "/pumping-station-demo",
     "icon": "water_pump",
@@ -1144,11 +1144,49 @@
     "order": 1,
     "className": ""
   },
+  {
+    "id": "ui_page_short_trends",
+    "type": "ui-page",
+    "name": "Trends \u2014 10 min",
+    "ui": "ui_base_ps_demo",
+    "path": "/pumping-station-demo/trends-short",
+    "icon": "show_chart",
+    "layout": "grid",
+    "theme": "ui_theme_ps_demo",
+    "breakpoints": [
+      {
+        "name": "Default",
+        "px": "0",
+        "cols": "12"
+      }
+    ],
+    "order": 2,
+    "className": ""
+  },
+  {
+    "id": "ui_page_long_trends",
+    "type": "ui-page",
+    "name": "Trends \u2014 1 hour",
+    "ui": "ui_base_ps_demo",
+    "path": "/pumping-station-demo/trends-long",
+    "icon": "timeline",
+    "layout": "grid",
+    "theme": "ui_theme_ps_demo",
+    "breakpoints": [
+      {
+        "name": "Default",
+        "px": "0",
+        "cols": "12"
+      }
+    ],
+    "order": 3,
+    "className": ""
+  },
   {
     "id": "ui_grp_demand",
     "type": "ui-group",
     "name": "1. Process Demand",
-    "page": "ui_page_ps_demo",
+    "page": "ui_page_control",
     "width": "12",
     "height": "1",
     "order": 1,
@@ -1162,7 +1200,7 @@
     "id": "ui_grp_station",
     "type": "ui-group",
     "name": "2. Station Controls",
-    "page": "ui_page_ps_demo",
+    "page": "ui_page_control",
     "width": "12",
     "height": "1",
     "order": 2,
@@ -1176,7 +1214,7 @@
     "id": "ui_grp_mgc",
     "type": "ui-group",
     "name": "3a. MGC Status",
-    "page": "ui_page_ps_demo",
+    "page": "ui_page_control",
     "width": "6",
     "height": "1",
     "order": 3,
@@ -1190,7 +1228,7 @@
     "id": "ui_grp_ps",
     "type": "ui-group",
     "name": "3b. Basin Status",
-    "page": "ui_page_ps_demo",
+    "page": "ui_page_control",
     "width": "6",
     "height": "1",
     "order": 4,
@@ -1204,7 +1242,7 @@
     "id": "ui_grp_pump_a",
     "type": "ui-group",
     "name": "4a. Pump A",
-    "page": "ui_page_ps_demo",
+    "page": "ui_page_control",
     "width": "4",
     "height": "1",
     "order": 5,
@@ -1218,7 +1256,7 @@
     "id": "ui_grp_pump_b",
     "type": "ui-group",
     "name": "4b. Pump B",
-    "page": "ui_page_ps_demo",
+    "page": "ui_page_control",
     "width": "4",
     "height": "1",
     "order": 6,
@@ -1232,7 +1270,7 @@
     "id": "ui_grp_pump_c",
     "type": "ui-group",
     "name": "4c. Pump C",
-    "page": "ui_page_ps_demo",
+    "page": "ui_page_control",
     "width": "4",
     "height": "1",
     "order": 7,
@@ -1243,13 +1281,55 @@
     "visible": true
   },
   {
-    "id": "ui_grp_trend",
+    "id": "ui_grp_trend_short_flow",
     "type": "ui-group",
-    "name": "5. Trends",
-    "page": "ui_page_ps_demo",
+    "name": "Flow (10 min)",
+    "page": "ui_page_short_trends",
     "width": "12",
     "height": "1",
-    "order": 8,
+    "order": 1,
+    "showTitle": true,
+    "className": "",
+    "groupType": "default",
+    "disabled": false,
+    "visible": true
+  },
+  {
+    "id": "ui_grp_trend_short_power",
+    "type": "ui-group",
+    "name": "Power (10 min)",
+    "page": "ui_page_short_trends",
+    "width": "12",
+    "height": "1",
+    "order": 2,
+    "showTitle": true,
+    "className": "",
+    "groupType": "default",
+    "disabled": false,
+    "visible": true
+  },
+  {
+    "id": "ui_grp_trend_long_flow",
+    "type": "ui-group",
+    "name": "Flow (1 hour)",
+    "page": "ui_page_long_trends",
+    "width": "12",
+    "height": "1",
+    "order": 1,
+    "showTitle": true,
+    "className": "",
+    "groupType": "default",
+    "disabled": false,
+    "visible": true
+  },
+  {
+    "id": "ui_grp_trend_long_power",
+    "type": "ui-group",
+    "name": "Power (1 hour)",
+    "page": "ui_page_long_trends",
+    "width": "12",
+    "height": "1",
+    "order": 2,
     "showTitle": true,
     "className": "",
     "groupType": "default",
@@ -2198,10 +2278,12 @@
     "y": 1080,
     "wires": [
       [
-        "trend_chart_flow"
+        "trend_short_flow",
+        "trend_long_flow"
       ],
       [
-        "trend_chart_power"
+        "trend_short_power",
+        "trend_long_power"
       ]
     ]
   },
@@ -2548,10 +2630,12 @@
     "y": 1480,
     "wires": [
       [
-        "trend_chart_flow"
+        "trend_short_flow",
+        "trend_long_flow"
       ],
       [
-        "trend_chart_power"
+        "trend_short_power",
+        "trend_long_power"
       ]
     ]
   },
@@ -2898,10 +2982,12 @@
     "y": 1880,
     "wires": [
       [
-        "trend_chart_flow"
+        "trend_short_flow",
+        "trend_long_flow"
       ],
       [
-        "trend_chart_power"
+        "trend_short_power",
+        "trend_long_power"
       ]
     ]
   },
@@ -2909,19 +2995,19 @@
     "id": "c_ui_trends",
     "type": "comment",
     "z": "tab_ui",
-    "name": "\u2500\u2500 Trends (shared by all pumps) \u2500\u2500",
-    "info": "Each chart accepts msg.topic as the series name (categoryType=msg).",
+    "name": "\u2500\u2500 Trend charts \u2500\u2500 (feed to 4 charts on 2 pages)",
+    "info": "Short-term (10 min) and long-term (1 h) trends share the same feed.\nEach chart on its own page.",
     "x": 640,
     "y": 2280,
     "wires": []
   },
   {
-    "id": "trend_chart_flow",
+    "id": "trend_short_flow",
     "type": "ui-chart",
     "z": "tab_ui",
-    "group": "ui_grp_trend",
-    "name": "Flow per pump (m\u00b3/h)",
-    "label": "Flow per pump",
+    "group": "ui_grp_trend_short_flow",
+    "name": "Flow per pump \u2014 10 min",
+    "label": "Flow per pump (m\u00b3/h)",
     "order": 1,
     "chartType": "line",
     "category": "topic",
@@ -2938,12 +3024,12 @@
     "showLegend": true,
     "removeOlder": "10",
     "removeOlderUnit": "60",
-    "removeOlderPoints": "200",
+    "removeOlderPoints": "300",
     "colors": [],
     "textColor": [],
     "textColorDefault": true,
-    "width": "0",
-    "height": "0",
+    "width": "12",
+    "height": "8",
     "className": "",
     "x": 900,
     "y": 2320,
@@ -2952,12 +3038,12 @@
     ]
   },
   {
-    "id": "trend_chart_power",
+    "id": "trend_short_power",
     "type": "ui-chart",
     "z": "tab_ui",
-    "group": "ui_grp_trend",
-    "name": "Power per pump (kW)",
-    "label": "Power per pump",
+    "group": "ui_grp_trend_short_power",
+    "name": "Power per pump \u2014 10 min",
+    "label": "Power per pump (kW)",
     "order": 1,
     "chartType": "line",
     "category": "topic",
@@ -2974,15 +3060,87 @@
     "showLegend": true,
     "removeOlder": "10",
     "removeOlderUnit": "60",
-    "removeOlderPoints": "200",
+    "removeOlderPoints": "300",
     "colors": [],
     "textColor": [],
     "textColorDefault": true,
-    "width": "0",
-    "height": "0",
+    "width": "12",
+    "height": "8",
     "className": "",
     "x": 900,
-    "y": 2380,
+    "y": 2400,
+    "wires": [
+      []
+    ]
+  },
+  {
+    "id": "trend_long_flow",
+    "type": "ui-chart",
+    "z": "tab_ui",
+    "group": "ui_grp_trend_long_flow",
+    "name": "Flow per pump \u2014 1 hour",
+    "label": "Flow per pump (m\u00b3/h)",
+    "order": 1,
+    "chartType": "line",
+    "category": "topic",
+    "categoryType": "msg",
+    "xAxisLabel": "",
+    "xAxisType": "time",
+    "xAxisTimeFormat": "auto",
+    "yAxisLabel": "",
+    "ymin": "",
+    "ymax": "",
+    "action": "append",
+    "pointShape": "circle",
+    "pointRadius": 2,
+    "showLegend": true,
+    "removeOlder": "60",
+    "removeOlderUnit": "60",
+    "removeOlderPoints": "1800",
+    "colors": [],
+    "textColor": [],
+    "textColorDefault": true,
+    "width": "12",
+    "height": "8",
+    "className": "",
+    "x": 900,
+    "y": 2480,
+    "wires": [
+      []
+    ]
+  },
+  {
+    "id": "trend_long_power",
+    "type": "ui-chart",
+    "z": "tab_ui",
+    "group": "ui_grp_trend_long_power",
+    "name": "Power per pump \u2014 1 hour",
+    "label": "Power per pump (kW)",
+    "order": 1,
+    "chartType": "line",
+    "category": "topic",
+    "categoryType": "msg",
+    "xAxisLabel": "",
+    "xAxisType": "time",
+    "xAxisTimeFormat": "auto",
+    "yAxisLabel": "",
+    "ymin": "",
+    "ymax": "",
+    "action": "append",
+    "pointShape": "circle",
+    "pointRadius": 2,
+    "showLegend": true,
+    "removeOlder": "60",
+    "removeOlderUnit": "60",
+    "removeOlderPoints": "1800",
+    "colors": [],
+    "textColor": [],
+    "textColorDefault": true,
+    "width": "12",
+    "height": "8",
+    "className": "",
+    "x": 900,
+    "y": 2560,
     "wires": [
       []
     ]