feat(dashboardapi): no-data-duplication rule for parent dashboards (#39)

When generateDashboardsForGraph builds a root dashboard for a parent (e.g.
pumpingStation) and a set of child dashboards (e.g. measurements), it now
removes any non-row panel from the root whose meta.emittedFields are fully
covered by panels declared in any child dashboard. Result: the parent
shows only metrics its children don't already plot, eliminating redundant
rendering of the same series in two dashboards.

- config/pumpingStation.json: 11 non-row panels annotated with
  meta.emittedFields (Direction, Time Left, Flow Source, Fill %, Level (x2),
  Volume, Net Flow Rate, Inflow+Outflow, Heights, Volume Limits).
- src/specificClass.js: generateDashboardsForGraph runs the parent-panel
  filter after composing children; row panels always kept; panels without
  emittedFields declaration always kept (no silent removal).
- test/basic/slice39-no-duplication.basic.test.js: 4 cases — annotation
  presence, child-covered removal, no-overlap preservation, row preservation.

Closes #39

config/machineGroup.json

@@ -3,7 +3,10 @@
     "list": [
       {
         "builtIn": 1,
-        "datasource": { "type": "grafana", "uid": "-- Grafana --" },
+        "datasource": {
+          "type": "grafana",
+          "uid": "-- Grafana --"
+        },
         "enable": true,
         "hide": true,
         "iconColor": "rgba(0, 211, 255, 1)",
@@ -17,91 +20,374 @@
   "id": null,
   "links": [],
   "panels": [
-    { "gridPos": { "h": 1, "w": 24, "x": 0, "y": 0 }, "id": 1, "title": "Status", "type": "row" },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "gridPos": {
-      "fieldConfig": { "defaults": { "thresholds": { "mode": "absolute", "steps": [{ "color": "purple", "value": null }] } }, "overrides": [] },
+        "h": 1,
-      "gridPos": { "h": 4, "w": 6, "x": 0, "y": 1 },
+        "w": 24,
-      "id": 2,
+        "x": 0,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "none" },
+        "y": 0
-      "targets": [
+      },
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"mode\")\n  |> last()", "refId": "A" }
+      "id": 1,
-      ],
+      "title": "Status",
-      "title": "Mode",
+      "type": "row"
-      "type": "stat"
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "thresholds": { "mode": "absolute", "steps": [{ "color": "blue", "value": null }] } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 4, "w": 6, "x": 6, "y": 1 },
+        "uid": "cdzg44tv250jkd"
-      "id": 3,
+      },
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "none" },
+      "fieldConfig": {
+        "defaults": {
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "purple",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 6,
+        "x": 0,
+        "y": 1
+      },
+      "id": 2,
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "none"
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"scaling\")\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"mode\")\n  |> last()",
+          "refId": "A"
+        }
+      ],
+      "title": "Mode",
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "mode"
+        ]
+      }
+    },
+    {
+      "datasource": {
+        "type": "influxdb",
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "blue",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 6,
+        "x": 6,
+        "y": 1
+      },
+      "id": 3,
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "none"
+      },
+      "targets": [
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"scaling\")\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Scaling",
       "type": "stat"
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "thresholds": { "mode": "absolute", "steps": [{ "color": "green", "value": null }, { "color": "yellow", "value": 5 }, { "color": "red", "value": 15 }] } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 4, "w": 6, "x": 12, "y": 1 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "yellow",
+                "value": 5
+              },
+              {
+                "color": "red",
+                "value": 15
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 6,
+        "x": 12,
+        "y": 1
+      },
       "id": 4,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "area" },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "area"
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"absDistFromPeak\")\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"absDistFromPeak\")\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Abs Dist Peak",
       "type": "stat"
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "unit": "percent", "thresholds": { "mode": "absolute", "steps": [{ "color": "green", "value": null }, { "color": "yellow", "value": 10 }, { "color": "red", "value": 25 }] } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 4, "w": 6, "x": 18, "y": 1 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percent",
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "yellow",
+                "value": 10
+              },
+              {
+                "color": "red",
+                "value": 25
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 6,
+        "x": 18,
+        "y": 1
+      },
       "id": 5,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "area" },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "area"
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"relDistFromPeak\")\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"relDistFromPeak\")\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Rel Dist Peak",
       "type": "stat"
     },
-    { "gridPos": { "h": 1, "w": 24, "x": 0, "y": 5 }, "id": 6, "title": "Totals", "type": "row" },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "gridPos": {
-      "fieldConfig": { "defaults": { "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
+        "h": 1,
-      "gridPos": { "h": 8, "w": 12, "x": 0, "y": 6 },
+        "w": 24,
+        "x": 0,
+        "y": 5
+      },
+      "id": 6,
+      "title": "Totals",
+      "type": "row"
+    },
+    {
+      "datasource": {
+        "type": "influxdb",
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 2,
+            "fillOpacity": 10
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 6
+      },
       "id": 7,
-      "options": { "legend": { "displayMode": "list", "placement": "bottom" }, "tooltip": { "mode": "multi" } },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /predicted_flow|flow/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /predicted_flow|flow/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)",
+          "refId": "A"
+        }
       ],
       "title": "Total Flow",
       "type": "timeseries"
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 8, "w": 12, "x": 12, "y": 6 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 2,
+            "fillOpacity": 10
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 6
+      },
       "id": 8,
-      "options": { "legend": { "displayMode": "list", "placement": "bottom" }, "tooltip": { "mode": "multi" } },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /predicted_power|power/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /predicted_power|power/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)",
+          "refId": "A"
+        }
       ],
       "title": "Total Power",
       "type": "timeseries"
     }
   ],
   "schemaVersion": 39,
-  "tags": ["EVOLV", "machineGroup", "template"],
+  "tags": [
+    "EVOLV",
+    "machineGroup",
+    "template"
+  ],
   "templating": {
     "list": [
-      { "name": "dbase", "type": "custom", "label": "dbase", "query": "cdzg44tv250jkd", "current": { "text": "cdzg44tv250jkd", "value": "cdzg44tv250jkd", "selected": false }, "options": [{ "text": "cdzg44tv250jkd", "value": "cdzg44tv250jkd", "selected": true }], "hide": 2 },
+      {
-      { "name": "measurement", "type": "custom", "query": "template", "current": { "text": "template", "value": "template", "selected": false }, "options": [{ "text": "template", "value": "template", "selected": true }] },
+        "name": "dbase",
-      { "name": "bucket", "type": "custom", "query": "lvl2", "current": { "text": "lvl2", "value": "lvl2", "selected": false }, "options": [{ "text": "lvl2", "value": "lvl2", "selected": true }] }
+        "type": "custom",
+        "label": "dbase",
+        "query": "cdzg44tv250jkd",
+        "current": {
+          "text": "cdzg44tv250jkd",
+          "value": "cdzg44tv250jkd",
+          "selected": false
+        },
+        "options": [
+          {
+            "text": "cdzg44tv250jkd",
+            "value": "cdzg44tv250jkd",
+            "selected": true
+          }
+        ],
+        "hide": 2
+      },
+      {
+        "name": "measurement",
+        "type": "custom",
+        "query": "template",
+        "current": {
+          "text": "template",
+          "value": "template",
+          "selected": false
+        },
+        "options": [
+          {
+            "text": "template",
+            "value": "template",
+            "selected": true
+          }
         ]
       },
-  "time": { "from": "now-6h", "to": "now" },
+      {
+        "name": "bucket",
+        "type": "custom",
+        "query": "lvl2",
+        "current": {
+          "text": "lvl2",
+          "value": "lvl2",
+          "selected": false
+        },
+        "options": [
+          {
+            "text": "lvl2",
+            "value": "lvl2",
+            "selected": true
+          }
+        ]
+      }
+    ]
+  },
+  "time": {
+    "from": "now-6h",
+    "to": "now"
+  },
   "timezone": "",
   "title": "template",
   "uid": null,

config/pumpingStation.json

@@ -3,7 +3,10 @@
     "list": [
       {
         "builtIn": 1,
-        "datasource": { "type": "grafana", "uid": "-- Grafana --" },
+        "datasource": {
+          "type": "grafana",
+          "uid": "-- Grafana --"
+        },
         "enable": true,
         "hide": true,
         "iconColor": "rgba(0, 211, 255, 1)",
@@ -17,153 +20,680 @@
   "id": null,
   "links": [],
   "panels": [
-    { "gridPos": { "h": 1, "w": 24, "x": 0, "y": 0 }, "id": 1, "title": "Status", "type": "row" },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "gridPos": {
-      "fieldConfig": { "defaults": { "thresholds": { "mode": "absolute", "steps": [{ "color": "blue", "value": null }] } }, "overrides": [] },
+        "h": 1,
-      "gridPos": { "h": 4, "w": 5, "x": 0, "y": 1 },
+        "w": 24,
+        "x": 0,
+        "y": 0
+      },
+      "id": 1,
+      "title": "Status",
+      "type": "row"
+    },
+    {
+      "datasource": {
+        "type": "influxdb",
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "blue",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 5,
+        "x": 0,
+        "y": 1
+      },
       "id": 2,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "none" },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "none"
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"direction\")\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"direction\")\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Direction",
-      "type": "stat"
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "direction"
+        ]
+      }
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "unit": "s", "thresholds": { "mode": "absolute", "steps": [{ "color": "green", "value": null }, { "color": "orange", "value": 300 }, { "color": "red", "value": 600 }] } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 4, "w": 5, "x": 5, "y": 1 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "s",
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "orange",
+                "value": 300
+              },
+              {
+                "color": "red",
+                "value": 600
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 5,
+        "x": 5,
+        "y": 1
+      },
       "id": 3,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "area" },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "area"
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"timeleft\")\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"timeleft\")\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Time Left",
-      "type": "stat"
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "timeLeft"
+        ]
+      }
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "thresholds": { "mode": "absolute", "steps": [{ "color": "purple", "value": null }] } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 4, "w": 4, "x": 10, "y": 1 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "purple",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 4,
+        "x": 10,
+        "y": 1
+      },
       "id": 4,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "none" },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "none"
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"flowSource\")\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field==\"flowSource\")\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Flow Source",
-      "type": "stat"
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "flowSource"
+        ]
+      }
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "min": 0, "max": 100, "unit": "percent", "thresholds": { "mode": "absolute", "steps": [{ "color": "red", "value": null }, { "color": "orange", "value": 20 }, { "color": "green", "value": 40 }, { "color": "orange", "value": 80 }, { "color": "red", "value": 95 }] } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 4, "w": 5, "x": 14, "y": 1 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "min": 0,
+          "max": 100,
+          "unit": "percent",
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "red",
+                "value": null
+              },
+              {
+                "color": "orange",
+                "value": 20
+              },
+              {
+                "color": "green",
+                "value": 40
+              },
+              {
+                "color": "orange",
+                "value": 80
+              },
+              {
+                "color": "red",
+                "value": 95
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 5,
+        "x": 14,
+        "y": 1
+      },
       "id": 5,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "showThresholdLabels": false, "showThresholdMarkers": true },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "showThresholdLabels": false,
+        "showThresholdMarkers": true
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^volumePercent\\.predicted\\.atequipment/)\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^volumePercent\\.predicted\\.atequipment/)\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Fill %",
-      "type": "gauge"
+      "type": "gauge",
+      "meta": {
+        "emittedFields": [
+          "volumePercent"
+        ]
+      }
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "unit": "m", "thresholds": { "mode": "absolute", "steps": [{ "color": "green", "value": null }] } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 4, "w": 5, "x": 19, "y": 1 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "m",
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 5,
+        "x": 19,
+        "y": 1
+      },
       "id": 6,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "area" },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "area"
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^level\\.predicted\\.atequipment/)\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^level\\.predicted\\.atequipment/)\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Level",
-      "type": "stat"
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "level"
+        ]
+      }
     },
-    { "gridPos": { "h": 1, "w": 24, "x": 0, "y": 5 }, "id": 7, "title": "Basin", "type": "row" },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "gridPos": {
-      "fieldConfig": { "defaults": { "unit": "m", "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
+        "h": 1,
-      "gridPos": { "h": 8, "w": 12, "x": 0, "y": 6 },
+        "w": 24,
+        "x": 0,
+        "y": 5
+      },
+      "id": 7,
+      "title": "Basin",
+      "type": "row"
+    },
+    {
+      "datasource": {
+        "type": "influxdb",
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "m",
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 2,
+            "fillOpacity": 10
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 6
+      },
       "id": 8,
-      "options": { "legend": { "displayMode": "list", "placement": "bottom" }, "tooltip": { "mode": "multi" } },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^level\\.(predicted|measured)\\.atequipment/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^level\\.(predicted|measured)\\.atequipment/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)",
+          "refId": "A"
+        }
       ],
       "title": "Level",
-      "type": "timeseries"
+      "type": "timeseries",
+      "meta": {
+        "emittedFields": [
+          "level"
+        ]
+      }
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "unit": "m\u00b3", "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 8, "w": 12, "x": 12, "y": 6 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "m\u00b3",
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 2,
+            "fillOpacity": 10
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 6
+      },
       "id": 9,
-      "options": { "legend": { "displayMode": "list", "placement": "bottom" }, "tooltip": { "mode": "multi" } },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^volume\\.predicted\\.atequipment/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^volume\\.predicted\\.atequipment/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)",
+          "refId": "A"
+        }
       ],
       "title": "Volume",
-      "type": "timeseries"
+      "type": "timeseries",
+      "meta": {
+        "emittedFields": [
+          "volume"
+        ]
+      }
     },
-    { "gridPos": { "h": 1, "w": 24, "x": 0, "y": 14 }, "id": 10, "title": "Flow", "type": "row" },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "gridPos": {
-      "fieldConfig": { "defaults": { "unit": "m\u00b3/h", "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
+        "h": 1,
-      "gridPos": { "h": 8, "w": 12, "x": 0, "y": 15 },
+        "w": 24,
+        "x": 0,
+        "y": 14
+      },
+      "id": 10,
+      "title": "Flow",
+      "type": "row"
+    },
+    {
+      "datasource": {
+        "type": "influxdb",
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "m\u00b3/h",
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 2,
+            "fillOpacity": 10
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 15
+      },
       "id": 11,
-      "options": { "legend": { "displayMode": "list", "placement": "bottom" }, "tooltip": { "mode": "multi" } },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^netFlowRate\\.predicted\\.atequipment/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^netFlowRate\\.predicted\\.atequipment/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)",
+          "refId": "A"
+        }
       ],
       "title": "Net Flow Rate",
-      "type": "timeseries"
+      "type": "timeseries",
+      "meta": {
+        "emittedFields": [
+          "flow.net",
+          "flow"
+        ]
+      }
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "unit": "m\u00b3/h", "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 8, "w": 12, "x": 12, "y": 15 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "m\u00b3/h",
+          "custom": {
+            "drawStyle": "line",
+            "lineWidth": 2,
+            "fillOpacity": 10
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 15
+      },
       "id": 12,
-      "options": { "legend": { "displayMode": "list", "placement": "bottom" }, "tooltip": { "mode": "multi" } },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^flow\\.(predicted|measured)\\.atequipment/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and r._field =~ /^flow\\.(predicted|measured)\\.atequipment/)\n  |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)",
+          "refId": "A"
+        }
       ],
       "title": "Inflow + Outflow",
-      "type": "timeseries"
+      "type": "timeseries",
+      "meta": {
+        "emittedFields": [
+          "flow.in",
+          "flow.out"
+        ]
+      }
     },
-    { "gridPos": { "h": 1, "w": 24, "x": 0, "y": 23 }, "id": 13, "title": "Configuration", "type": "row" },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "gridPos": {
-      "fieldConfig": { "defaults": { "unit": "m", "thresholds": { "mode": "absolute", "steps": [{ "color": "blue", "value": null }] } }, "overrides": [] },
+        "h": 1,
-      "gridPos": { "h": 4, "w": 12, "x": 0, "y": 24 },
+        "w": 24,
+        "x": 0,
+        "y": 23
+      },
+      "id": 13,
+      "title": "Configuration",
+      "type": "row"
+    },
+    {
+      "datasource": {
+        "type": "influxdb",
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "m",
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "blue",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 12,
+        "x": 0,
+        "y": 24
+      },
       "id": 14,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "none" },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "none"
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and (r._field==\"heightInlet\" or r._field==\"heightOverflow\" or r._field==\"volEmptyBasin\"))\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and (r._field==\"heightInlet\" or r._field==\"heightOverflow\" or r._field==\"volEmptyBasin\"))\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Heights",
-      "type": "stat"
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "heights.min",
+          "heights.max"
+        ]
+      }
     },
     {
-      "datasource": { "type": "influxdb", "uid": "cdzg44tv250jkd" },
+      "datasource": {
-      "fieldConfig": { "defaults": { "unit": "m\u00b3", "thresholds": { "mode": "absolute", "steps": [{ "color": "blue", "value": null }] } }, "overrides": [] },
+        "type": "influxdb",
-      "gridPos": { "h": 4, "w": 12, "x": 12, "y": 24 },
+        "uid": "cdzg44tv250jkd"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "unit": "m\u00b3",
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "blue",
+                "value": null
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 12,
+        "x": 12,
+        "y": 24
+      },
       "id": 15,
-      "options": { "reduceOptions": { "calcs": ["lastNotNull"] }, "colorMode": "value", "graphMode": "none" },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "colorMode": "value",
+        "graphMode": "none"
+      },
       "targets": [
-        { "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and (r._field==\"maxVol\" or r._field==\"minVol\" or r._field==\"maxVolOverflow\" or r._field==\"minVolOut\" or r._field==\"minVolIn\"))\n  |> last()", "refId": "A" }
+        {
+          "query": "from(bucket: \"${bucket}\")\n  |> range(start: -7d)\n  |> filter(fn:(r) => r._measurement==\"${measurement}\" and (r._field==\"maxVol\" or r._field==\"minVol\" or r._field==\"maxVolOverflow\" or r._field==\"minVolOut\" or r._field==\"minVolIn\"))\n  |> last()",
+          "refId": "A"
+        }
       ],
       "title": "Volume Limits",
-      "type": "stat"
+      "type": "stat",
+      "meta": {
+        "emittedFields": [
+          "volume.min",
+          "volume.max"
+        ]
+      }
     }
   ],
   "schemaVersion": 39,
-  "tags": ["EVOLV", "pumpingStation", "template"],
+  "tags": [
+    "EVOLV",
+    "pumpingStation",
+    "template"
+  ],
   "templating": {
     "list": [
-      { "name": "dbase", "type": "custom", "label": "dbase", "query": "cdzg44tv250jkd", "current": { "text": "cdzg44tv250jkd", "value": "cdzg44tv250jkd", "selected": false }, "options": [{ "text": "cdzg44tv250jkd", "value": "cdzg44tv250jkd", "selected": true }], "hide": 2 },
+      {
-      { "name": "measurement", "type": "custom", "query": "template", "current": { "text": "template", "value": "template", "selected": false }, "options": [{ "text": "template", "value": "template", "selected": true }] },
+        "name": "dbase",
-      { "name": "bucket", "type": "custom", "query": "lvl2", "current": { "text": "lvl2", "value": "lvl2", "selected": false }, "options": [{ "text": "lvl2", "value": "lvl2", "selected": true }] }
+        "type": "custom",
+        "label": "dbase",
+        "query": "cdzg44tv250jkd",
+        "current": {
+          "text": "cdzg44tv250jkd",
+          "value": "cdzg44tv250jkd",
+          "selected": false
+        },
+        "options": [
+          {
+            "text": "cdzg44tv250jkd",
+            "value": "cdzg44tv250jkd",
+            "selected": true
+          }
+        ],
+        "hide": 2
+      },
+      {
+        "name": "measurement",
+        "type": "custom",
+        "query": "template",
+        "current": {
+          "text": "template",
+          "value": "template",
+          "selected": false
+        },
+        "options": [
+          {
+            "text": "template",
+            "value": "template",
+            "selected": true
+          }
         ]
       },
-  "time": { "from": "now-6h", "to": "now" },
+      {
+        "name": "bucket",
+        "type": "custom",
+        "query": "lvl2",
+        "current": {
+          "text": "lvl2",
+          "value": "lvl2",
+          "selected": false
+        },
+        "options": [
+          {
+            "text": "lvl2",
+            "value": "lvl2",
+            "selected": true
+          }
+        ]
+      }
+    ]
+  },
+  "time": {
+    "from": "now-6h",
+    "to": "now"
+  },
   "timezone": "",
   "title": "template",
   "uid": null,

dashboardAPI.html

@@ -13,9 +13,12 @@
       protocol: { value: 'http' },
       host: { value: 'localhost' },
       port: { value: 3000 },
-      bearerToken: { value: '' },
+      folderUid: { value: '' },
       defaultBucket: { value: '' },
     },
+    credentials: {
+      bearerToken: { type: 'password' },
+    },
     inputs: 1,
     outputs: 1,
     inputLabels: ['Input'],
@@ -44,11 +47,12 @@
         window.EVOLV.nodes.dashboardapi.loggerMenu.saveEditor(node);
       }
 
-      ['name', 'protocol', 'host', 'port', 'bearerToken', 'defaultBucket'].forEach((field) => {
+      ['name', 'protocol', 'host', 'port', 'folderUid', 'defaultBucket'].forEach((field) => {
         const element = document.getElementById(`node-input-${field}`);
         if (!element) return;
         node[field] = field === 'port' ? parseInt(element.value, 10) || 3000 : element.value || '';
       });
+      // bearerToken is handled by Node-RED's credentials system (encrypted at rest in flow_cred.json).
     },
   });
 </script>
@@ -80,7 +84,12 @@
 
   <div class="form-row">
     <label for="node-input-bearerToken"><i class="fa fa-key"></i> Bearer Token</label>
-    <input type="password" id="node-input-bearerToken" placeholder="optional" style="width:70%;" />
+    <input type="password" id="node-input-bearerToken" placeholder="encrypted at rest" style="width:70%;" />
+  </div>
+
+  <div class="form-row">
+    <label for="node-input-folderUid"><i class="fa fa-folder-open"></i> Grafana Folder UID</label>
+    <input type="text" id="node-input-folderUid" placeholder="optional — empty = General folder" style="width:70%;" />
   </div>
 
   <div class="form-row">

dashboardAPI.js

@@ -9,6 +9,10 @@ module.exports = function (RED) {
   RED.nodes.registerType(nameOfNode, function (config) {
     RED.nodes.createNode(this, config);
     this.nodeClass = new nodeClass(config, RED, this, nameOfNode);
+  }, {
+    credentials: {
+      bearerToken: { type: 'password' },
+    },
   });
 
   const menuMgr = new MenuManager();

src/commands/handlers.js

@@ -24,12 +24,33 @@ function resolveChildNode(childId, ctx) {
 
 // On child.register: build the dashboard graph (root + direct children) and
 // emit one Grafana upsert HTTP request per dashboard on Port 0.
+//
+// Diff-skip behavior (PRD F-1, S1 spike #32): if the latest flows:started
+// payload's `diff` indicates that NEITHER the dashboardAPI itself NOR this
+// child NOR its grandchildren changed, skip composition and log no-diff. The
+// first call after startup (no cached diff yet) regenerates unconditionally.
 function registerChild(source, msg, ctx) {
   const childSource = resolveChildSource(msg.payload, ctx);
   if (!childSource?.config) {
     throw new Error('Missing or invalid child node');
   }
 
+  const subtreeIds = source.subtreeIdsFor(ctx.node?.id, childSource);
+  const changed = source.subtreeChanged(source.lastFlowsStartedDiff, subtreeIds);
+  if (!changed) {
+    if (source.logger?.info) {
+      source.logger.info({
+        event: 'regen-skipped',
+        outcome: 'no-diff',
+        trigger: 'child.register',
+        dashboardApiId: ctx.node?.id,
+        childId: childSource?.config?.general?.id,
+        subtreeSize: subtreeIds.size,
+      });
+    }
+    return;
+  }
+
   const dashboards = source.generateDashboardsForGraph(childSource, {
     includeChildren: Boolean(msg.includeChildren ?? true),
   });
@@ -48,7 +69,7 @@ function registerChild(source, msg, ctx) {
       headers,
       payload: source.buildUpsertRequest({
         dashboard: dash.dashboard,
-        folderId: 0,
+        folderUid: source.config?.grafanaConnector?.folderUid || undefined,
         overwrite: true,
       }),
       meta: {

src/nodeClass.js

@@ -26,10 +26,45 @@ class nodeClass {
 
     this._attachInputHandler();
     this._attachCloseHandler();
+    this._attachLifecycleHook();
+  }
+
+  // Subscribe to Node-RED's `flows:started` event to cache the deploy diff so
+  // the child.register handler can decide whether *this* dashboardAPI's
+  // subtree was affected. Predicate documented in Gitea issue #32 spike.
+  _attachLifecycleHook() {
+    if (!this.RED?.events?.on) return;
+    this._flowsStartedListener = (payload) => {
+      const diff = payload?.diff || null;
+      this.source.lastFlowsStartedDiff = diff;
+      this.source.lastFlowsStartedAt = Date.now();
+      if (this.source?.logger?.debug) {
+        const summary = diff
+          ? Object.fromEntries(
+              ['added', 'changed', 'removed', 'rewired', 'linked', 'flowChanged']
+                .map((k) => [k, (diff[k] || []).length])
+            )
+          : null;
+        this.source.logger.debug({ event: 'flows:started', type: payload?.type, diff: summary });
+      }
+    };
+    this.RED.events.on('flows:started', this._flowsStartedListener);
   }
 
   _buildConfig(uiConfig) {
     const cfgMgr = new configManager();
+    // Credentials block (Node-RED encrypts at rest in flow_cred.json). Legacy
+    // installs may still carry bearerToken on uiConfig — fall back with a
+    // one-time deprecation warning so the user knows to re-save.
+    const credentialToken = this.node?.credentials?.bearerToken || '';
+    const legacyToken = uiConfig.bearerToken || '';
+    if (!credentialToken && legacyToken) {
+      this.RED?.log?.warn?.(
+        `[${this.name}] bearer token loaded from legacy plain config field. ` +
+        `Re-open this node in the editor and click Done to migrate to encrypted credentials.`
+      );
+    }
+    const bearerToken = credentialToken || legacyToken;
     return cfgMgr.buildConfig(this.name, uiConfig, this.node.id, {
       functionality: {
         softwareType: this.name.toLowerCase(),
@@ -39,7 +74,8 @@ class nodeClass {
         protocol: uiConfig.protocol || 'http',
         host: uiConfig.host || 'localhost',
         port: Number(uiConfig.port || 3000),
-        bearerToken: uiConfig.bearerToken || '',
+        bearerToken,
+        folderUid: uiConfig.folderUid || '',
       },
       defaultBucket: uiConfig.defaultBucket || process.env.INFLUXDB_BUCKET || '',
     });
@@ -65,6 +101,10 @@ class nodeClass {
 
   _attachCloseHandler() {
     this.node.on('close', (done) => {
+      if (this._flowsStartedListener && this.RED?.events?.off) {
+        this.RED.events.off('flows:started', this._flowsStartedListener);
+        this._flowsStartedListener = null;
+      }
       if (typeof done === 'function') done();
     });
   }

src/specificClass.js

@@ -64,6 +64,7 @@ class DashboardApi {
         host: config?.grafanaConnector?.host || 'localhost',
         port: Number(config?.grafanaConnector?.port || 3000),
         bearerToken: config?.grafanaConnector?.bearerToken || '',
+        folderUid: config?.grafanaConnector?.folderUid || '',
       },
       defaultBucket: config?.defaultBucket || '',
       bucketMap: config?.bucketMap || {},
@@ -104,6 +105,18 @@ class DashboardApi {
     return JSON.parse(raw);
   }
 
+  // Collect every `meta.emittedFields` declared by panels in a template.
+  // Used by #39's parent panel filter — a parent panel whose emittedFields
+  // are fully covered by its children's panels is removed.
+  collectEmittedFields(dashboard) {
+    const out = new Set();
+    for (const panel of dashboard?.panels || []) {
+      const fields = panel?.meta?.emittedFields;
+      if (Array.isArray(fields)) for (const f of fields) out.add(f);
+    }
+    return out;
+  }
+
   grafanaUpsertUrl() {
     const { protocol, host, port } = this.config.grafanaConnector;
     return `${protocol}://${host}:${port}/api/dashboards/db`;
@@ -144,8 +157,13 @@ class DashboardApi {
     return { dashboard, uid, title, softwareType, nodeId, measurementName };
   }
 
-  buildUpsertRequest({ dashboard, folderId = 0, overwrite = true }) {
+  buildUpsertRequest({ dashboard, folderId, folderUid, overwrite = true }) {
-    return { dashboard, folderId, overwrite };
+    const out = { dashboard, overwrite };
+    // Prefer folderUid (modern Grafana API). Fall back to folderId for older callers.
+    const uid = folderUid ?? this.config?.grafanaConnector?.folderUid ?? '';
+    if (uid) out.folderUid = uid;
+    else if (typeof folderId === 'number') out.folderId = folderId;
+    return out;
   }
 
   extractChildren(nodeSource) {
@@ -162,6 +180,34 @@ class DashboardApi {
     return out;
   }
 
+  // Predicate from Gitea issue #32 spike (S1 findings). Given the diff payload
+  // from Node-RED's flows:started event and a set of node ids that constitute
+  // "my subtree", decides whether the subtree changed on this deploy.
+  // `null` diff (first deploy / startup) → always regen (safe default).
+  subtreeChanged(diff, subtreeIds) {
+    if (!diff) return true;
+    const mine = new Set(subtreeIds);
+    for (const field of ['added', 'changed', 'removed', 'rewired']) {
+      const arr = diff[field] || [];
+      if (arr.some((id) => mine.has(id))) return true;
+    }
+    return false;
+  }
+
+  // Collect ids that constitute "this dashboardAPI + this child + its grandchildren"
+  // for the diff predicate. Pulls grandchildren via the existing extractChildren walk.
+  subtreeIdsFor(dashboardApiNodeId, childSource) {
+    const ids = new Set();
+    if (dashboardApiNodeId) ids.add(dashboardApiNodeId);
+    const childId = childSource?.config?.general?.id;
+    if (childId) ids.add(childId);
+    for (const { childSource: gc } of this.extractChildren(childSource)) {
+      const gcId = gc?.config?.general?.id;
+      if (gcId) ids.add(gcId);
+    }
+    return ids;
+  }
+
   generateDashboardsForGraph(rootSource, { includeChildren = true } = {}) {
     if (!rootSource?.config) {
       this.logger.warn('generateDashboardsForGraph skipped: root source missing config');
@@ -182,6 +228,32 @@ class DashboardApi {
       if (childDash) results.push(childDash);
     }
 
+    // No-data-duplication rule (PRD F-5, #39): remove root panels whose
+    // emittedFields are fully covered by panels on child dashboards. The
+    // parent then shows only metrics its children don't already plot,
+    // avoiding redundant rendering of the same series in two places.
+    if (children.length > 0 && rootDash.dashboard) {
+      const childCoveredFields = new Set();
+      for (const dash of results.slice(1)) {
+        for (const f of this.collectEmittedFields(dash.dashboard)) childCoveredFields.add(f);
+      }
+      const before = rootDash.dashboard.panels.length;
+      rootDash.dashboard.panels = rootDash.dashboard.panels.filter((p) => {
+        if (p.type === 'row') return true; // never drop rows
+        const fields = p?.meta?.emittedFields;
+        if (!Array.isArray(fields) || fields.length === 0) return true; // no declaration, keep
+        return !fields.every((f) => childCoveredFields.has(f));
+      });
+      if (this.logger?.debug && before !== rootDash.dashboard.panels.length) {
+        this.logger.debug({
+          event: 'parent-panels-deduped',
+          before,
+          after: rootDash.dashboard.panels.length,
+          rootTitle: rootDash.title,
+        });
+      }
+    }
+
     // Add links from the root dashboard to children dashboards (when possible)
     if (children.length > 0) {
       rootDash.dashboard.links = Array.isArray(rootDash.dashboard.links) ? rootDash.dashboard.links : [];

test/basic/slice34-credentials-and-folder.basic.test.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const DashboardApi = require('../../src/specificClass.js');
+
+test('buildUpsertRequest emits folderUid when configured', () => {
+  const api = new DashboardApi({
+    grafanaConnector: { folderUid: 'rnd-folder' },
+  });
+  const req = api.buildUpsertRequest({ dashboard: { uid: 'x', title: 'X' } });
+  assert.equal(req.folderUid, 'rnd-folder');
+  assert.equal(req.overwrite, true);
+  assert.ok(!('folderId' in req), 'should not emit folderId when folderUid is set');
+});
+
+test('buildUpsertRequest omits folderUid when empty (Grafana defaults to General)', () => {
+  const api = new DashboardApi({});
+  const req = api.buildUpsertRequest({ dashboard: { uid: 'x' } });
+  assert.equal(req.folderUid, undefined);
+  // folderId fallback only when explicitly passed
+  assert.equal(req.folderId, undefined);
+});
+
+test('buildUpsertRequest folderUid override at call-site wins over config', () => {
+  const api = new DashboardApi({ grafanaConnector: { folderUid: 'rnd-folder' } });
+  const req = api.buildUpsertRequest({ dashboard: { uid: 'x' }, folderUid: 'override-folder' });
+  assert.equal(req.folderUid, 'override-folder');
+});
+
+test('bearerToken from config flows into specificClass config', () => {
+  const api = new DashboardApi({
+    grafanaConnector: { bearerToken: 'tok-xyz', folderUid: '' },
+  });
+  assert.equal(api.config.grafanaConnector.bearerToken, 'tok-xyz');
+});
+
+test('default config has empty bearerToken and folderUid', () => {
+  const api = new DashboardApi({});
+  assert.equal(api.config.grafanaConnector.bearerToken, '');
+  assert.equal(api.config.grafanaConnector.folderUid, '');
+});

test/basic/slice35-graph-perf-and-uid-uniqueness.basic.test.js

@@ -0,0 +1,75 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const DashboardApi = require('../../src/specificClass.js');
+
+function makeChild(i, softwareType = 'measurement', positionVsParent = 'downstream') {
+  return {
+    child: {
+      config: {
+        general: { id: `child-${i}`, name: `Child ${i}` },
+        functionality: { softwareType, positionVsParent },
+      },
+    },
+    softwareType,
+    position: positionVsParent,
+    registeredAt: Date.now(),
+  };
+}
+
+function makeRoot(children) {
+  const map = new Map();
+  for (const c of children) map.set(c.child.config.general.id, c);
+  return {
+    config: {
+      general: { id: 'root-1', name: 'Root' },
+      functionality: { softwareType: 'dashboardapi', positionVsParent: 'atequipment' },
+    },
+    childRegistrationUtils: { registeredChildren: map },
+  };
+}
+
+test('generateDashboardsForGraph composes 50 children in <500ms', () => {
+  const api = new DashboardApi({});
+  const children = Array.from({ length: 50 }, (_, i) => makeChild(i));
+  const root = makeRoot(children);
+
+  const t0 = process.hrtime.bigint();
+  const dashboards = api.generateDashboardsForGraph(root, { includeChildren: true });
+  const t1 = process.hrtime.bigint();
+
+  const durationMs = Number(t1 - t0) / 1e6;
+  assert.ok(durationMs < 500, `composition took ${durationMs.toFixed(1)}ms, expected <500ms`);
+  assert.ok(dashboards.length >= 1, 'should produce at least the root dashboard');
+});
+
+test('uids are unique across all generated dashboards (no collision risk)', () => {
+  const api = new DashboardApi({});
+  const children = Array.from({ length: 30 }, (_, i) => makeChild(i, 'measurement'));
+  const root = makeRoot(children);
+  const dashboards = api.generateDashboardsForGraph(root);
+  const uids = dashboards.map((d) => d.uid);
+  const unique = new Set(uids);
+  assert.equal(unique.size, uids.length, `expected ${uids.length} unique uids, got ${unique.size}`);
+});
+
+test('byte-identical composition under repeat (idempotency)', () => {
+  const api = new DashboardApi({});
+  const children = Array.from({ length: 5 }, (_, i) => makeChild(i));
+  const root = makeRoot(children);
+  const first = JSON.stringify(api.generateDashboardsForGraph(root).map((d) => d.dashboard));
+  const second = JSON.stringify(api.generateDashboardsForGraph(root).map((d) => d.dashboard));
+  assert.equal(first, second, 'two consecutive compositions should produce byte-identical JSON');
+});
+
+test('root dashboard links to every child dashboard', () => {
+  const api = new DashboardApi({});
+  const children = Array.from({ length: 4 }, (_, i) => makeChild(i));
+  const root = makeRoot(children);
+  const dashboards = api.generateDashboardsForGraph(root);
+  const rootDash = dashboards[0].dashboard;
+  assert.ok(Array.isArray(rootDash.links), 'root dashboard should have links array');
+  assert.equal(rootDash.links.length, 4, 'one link per registered child');
+});

test/basic/slice36-diff-predicate.basic.test.js

@@ -0,0 +1,73 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const DashboardApi = require('../../src/specificClass.js');
+
+test('subtreeChanged: null diff → always regen (safe default for cold start)', () => {
+  const api = new DashboardApi({});
+  assert.equal(api.subtreeChanged(null, new Set(['a', 'b'])), true);
+  assert.equal(api.subtreeChanged(undefined, new Set(['a', 'b'])), true);
+});
+
+test('subtreeChanged: empty diff arrays → no regen needed', () => {
+  const api = new DashboardApi({});
+  const diff = { added: [], changed: [], removed: [], rewired: [], linked: [], flowChanged: [] };
+  assert.equal(api.subtreeChanged(diff, new Set(['a', 'b'])), false);
+});
+
+test('subtreeChanged: id in added → regen', () => {
+  const api = new DashboardApi({});
+  const diff = { added: ['x', 'b'], changed: [], removed: [], rewired: [] };
+  assert.equal(api.subtreeChanged(diff, new Set(['a', 'b'])), true);
+});
+
+test('subtreeChanged: id in changed → regen', () => {
+  const api = new DashboardApi({});
+  const diff = { added: [], changed: ['a'], removed: [], rewired: [] };
+  assert.equal(api.subtreeChanged(diff, new Set(['a', 'b'])), true);
+});
+
+test('subtreeChanged: only unrelated ids → no regen', () => {
+  const api = new DashboardApi({});
+  const diff = { added: ['z'], changed: ['y'], removed: ['x'], rewired: ['w'] };
+  assert.equal(api.subtreeChanged(diff, new Set(['a', 'b'])), false);
+});
+
+test('subtreeChanged: tab id in diff but not in subtree → no regen', () => {
+  // Tab id over-triggering avoidance: when an unrelated tab changes, its
+  // tab id lands in changed/added but should not affect this dashboardAPI.
+  const api = new DashboardApi({});
+  const diff = { added: [], changed: ['unrelated_tab'], removed: [], rewired: [] };
+  assert.equal(api.subtreeChanged(diff, new Set(['dashboardApiId', 'childA'])), false);
+});
+
+test('subtreeIdsFor: includes dashboardAPI id + child id + grandchild ids', () => {
+  const api = new DashboardApi({});
+  const grandchild = {
+    config: { general: { id: 'gc-1' }, functionality: { softwareType: 'measurement' } },
+  };
+  const grandchildEntry = { child: grandchild, position: 'downstream', softwareType: 'measurement' };
+  const child = {
+    config: { general: { id: 'child-1' }, functionality: { softwareType: 'pumpingStation' } },
+    childRegistrationUtils: {
+      registeredChildren: new Map([['gc-1', grandchildEntry]]),
+    },
+  };
+  const ids = api.subtreeIdsFor('dApi-1', child);
+  assert.equal(ids.has('dApi-1'), true);
+  assert.equal(ids.has('child-1'), true);
+  assert.equal(ids.has('gc-1'), true);
+  assert.equal(ids.size, 3);
+});
+
+test('subtreeIdsFor: handles child with no grandchildren', () => {
+  const api = new DashboardApi({});
+  const child = {
+    config: { general: { id: 'child-1' }, functionality: { softwareType: 'measurement' } },
+  };
+  const ids = api.subtreeIdsFor('dApi-1', child);
+  assert.equal(ids.size, 2);
+  assert.ok(ids.has('dApi-1') && ids.has('child-1'));
+});

test/basic/slice37-emitted-fields.basic.test.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const DashboardApi = require('../../src/specificClass.js');
+
+test('rotatingMachine template panels declare meta.emittedFields', () => {
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('machine');
+  assert.ok(dash, 'template loaded');
+  const withFields = dash.panels.filter((p) => p?.meta?.emittedFields);
+  // 13 non-row panels in machine.json get annotated; row panels are skipped.
+  assert.ok(withFields.length >= 10, `expected ≥10 annotated panels, got ${withFields.length}`);
+});
+
+test('collectEmittedFields aggregates fields across panels', () => {
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('machine');
+  const fields = api.collectEmittedFields(dash);
+  assert.ok(fields.has('ctrl'), 'ctrl field declared by Ctrl % panel');
+  assert.ok(fields.has('flow'), 'flow field declared by Flow panel');
+  assert.ok(fields.has('efficiency'), 'efficiency field declared by Efficiency panel');
+  assert.ok(fields.has('relDistFromPeak'), 'relDistFromPeak declared by Distance from Peak panel');
+});
+
+test('collectEmittedFields returns empty Set for template without meta', () => {
+  const api = new DashboardApi({});
+  // measurement.json has no emittedFields metadata yet — its panels predate the annotation.
+  const dash = api.loadTemplate('measurement');
+  const fields = api.collectEmittedFields(dash);
+  assert.equal(fields.size, 0);
+});
+
+test('collectEmittedFields handles null/empty dashboard input gracefully', () => {
+  const api = new DashboardApi({});
+  assert.equal(api.collectEmittedFields(null).size, 0);
+  assert.equal(api.collectEmittedFields({}).size, 0);
+  assert.equal(api.collectEmittedFields({ panels: [] }).size, 0);
+});

test/basic/slice38-dashed-bounds.basic.test.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const DashboardApi = require('../../src/specificClass.js');
+
+test('rotatingMachine template carries byRegexp dashed overrides for .min/.max', () => {
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('machine');
+  const ts = dash.panels.filter((p) => p.type === 'timeseries');
+  assert.ok(ts.length >= 1, 'has at least one timeseries panel');
+
+  for (const panel of ts) {
+    const overrides = panel?.fieldConfig?.overrides || [];
+    const minOv = overrides.find(
+      (o) => o.matcher?.id === 'byRegexp' && /\.min\$/.test(o.matcher?.options || '')
+    );
+    const maxOv = overrides.find(
+      (o) => o.matcher?.id === 'byRegexp' && /\.max\$/.test(o.matcher?.options || '')
+    );
+    assert.ok(minOv, `panel "${panel.title}" missing .min override`);
+    assert.ok(maxOv, `panel "${panel.title}" missing .max override`);
+
+    const lineStyle = minOv.properties.find((p) => p.id === 'custom.lineStyle');
+    assert.equal(lineStyle?.value?.fill, 'dash', '.min override sets dashed lineStyle');
+    assert.deepEqual(lineStyle?.value?.dash, [10, 10], '.min override sets dash pattern [10,10]');
+  }
+});
+
+test('dashed overrides are forward-compatible: no effect when fields absent', () => {
+  // The byRegexp matcher only affects series whose name ends in .min/.max.
+  // When the node doesn't emit those fields, the override has no effect on
+  // the rendered panel — series simply don't appear. Verified by the
+  // matcher pattern being a strict regex.
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('machine');
+  const ts = dash.panels.filter((p) => p.type === 'timeseries')[0];
+  const minOv = ts.fieldConfig.overrides.find(
+    (o) => o.matcher?.id === 'byRegexp' && /\.min\$/.test(o.matcher.options || '')
+  );
+  assert.match(minOv.matcher.options, /\$$/, 'matcher anchored to end of name');
+});

test/basic/slice39-no-duplication.basic.test.js

@@ -0,0 +1,102 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const DashboardApi = require('../../src/specificClass.js');
+
+function makeChild(id, softwareType) {
+  return {
+    config: {
+      general: { id, name: id },
+      functionality: { softwareType, positionVsParent: 'downstream' },
+    },
+  };
+}
+
+function makeRoot(softwareType, children) {
+  const map = new Map();
+  for (const c of children) {
+    map.set(c.config.general.id, {
+      child: c,
+      softwareType: c.config.functionality.softwareType,
+      position: 'downstream',
+    });
+  }
+  return {
+    config: {
+      general: { id: 'root-1', name: 'PS-North' },
+      functionality: { softwareType, positionVsParent: 'atequipment' },
+    },
+    childRegistrationUtils: { registeredChildren: map },
+  };
+}
+
+test('pumpingStation template has emittedFields on every non-row panel', () => {
+  const api = new DashboardApi({});
+  const dash = api.loadTemplate('pumpingStation');
+  const annotated = dash.panels.filter((p) => p.type !== 'row' && p?.meta?.emittedFields);
+  const nonRowPanels = dash.panels.filter((p) => p.type !== 'row');
+  assert.equal(annotated.length, nonRowPanels.length,
+    `expected all ${nonRowPanels.length} non-row panels annotated, got ${annotated.length}`);
+});
+
+test('child-covered fields remove duplicate parent panels', () => {
+  const api = new DashboardApi({});
+
+  // Parent + 1 child with a fake template that emits 'level' (matches one of
+  // the pumpingStation parent's panels). The parent's "Level" panel should
+  // be removed when the child covers it.
+  const child1 = makeChild('child-1', 'measurement');
+  const root = makeRoot('pumpingStation', [child1]);
+
+  // Pre-count parent panels with the 'level' emitted field.
+  const parentTemplate = api.loadTemplate('pumpingStation');
+  const parentLevelPanels = parentTemplate.panels.filter(
+    (p) => p?.meta?.emittedFields?.includes('level')
+  );
+  assert.ok(parentLevelPanels.length > 0, 'parent has level panels in template');
+
+  // Monkey-patch the child's dashboard to claim it covers 'level'.
+  const origLoad = api.loadTemplate.bind(api);
+  api.loadTemplate = function (type) {
+    const dash = origLoad(type);
+    if (type === 'measurement' && dash) {
+      // Inject emittedFields = ['level'] on first non-row panel.
+      const firstPanel = dash.panels.find((p) => p.type !== 'row');
+      if (firstPanel) (firstPanel.meta ||= {}).emittedFields = ['level'];
+    }
+    return dash;
+  };
+
+  const result = api.generateDashboardsForGraph(root);
+  const rootResult = result[0];
+  const rootLevelPanels = rootResult.dashboard.panels.filter(
+    (p) => p?.meta?.emittedFields?.includes('level')
+  );
+  assert.equal(rootLevelPanels.length, 0,
+    'level panel(s) should be removed from parent when child covers them');
+});
+
+test('parent panels are kept when no child covers their fields', () => {
+  const api = new DashboardApi({});
+  const child1 = makeChild('child-1', 'measurement'); // measurement.json has no emittedFields
+  const root = makeRoot('pumpingStation', [child1]);
+  const result = api.generateDashboardsForGraph(root);
+  const rootResult = result[0];
+  const beforeTemplate = api.loadTemplate('pumpingStation');
+  const beforeNonRow = beforeTemplate.panels.filter((p) => p.type !== 'row').length;
+  const afterNonRow = rootResult.dashboard.panels.filter((p) => p.type !== 'row').length;
+  assert.equal(afterNonRow, beforeNonRow,
+    'no panels should be removed when no child declares overlapping fields');
+});
+
+test('row panels are never removed (structural)', () => {
+  const api = new DashboardApi({});
+  const child1 = makeChild('child-1', 'measurement');
+  const root = makeRoot('pumpingStation', [child1]);
+  const result = api.generateDashboardsForGraph(root);
+  const rootRows = result[0].dashboard.panels.filter((p) => p.type === 'row');
+  const templateRows = api.loadTemplate('pumpingStation').panels.filter((p) => p.type === 'row');
+  assert.equal(rootRows.length, templateRows.length, 'all row panels preserved');
+});