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/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" },
-      "fieldConfig": { "defaults": { "thresholds": { "mode": "absolute", "steps": [{ "color": "blue", "value": null }] } }, "overrides": [] },
-      "gridPos": { "h": 4, "w": 5, "x": 0, "y": 1 },
+      "gridPos": {
+        "h": 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" },
-      "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 },
+      "datasource": {
+        "type": "influxdb",
+        "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" },
-      "fieldConfig": { "defaults": { "thresholds": { "mode": "absolute", "steps": [{ "color": "purple", "value": null }] } }, "overrides": [] },
-      "gridPos": { "h": 4, "w": 4, "x": 10, "y": 1 },
+      "datasource": {
+        "type": "influxdb",
+        "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" },
-      "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 },
+      "datasource": {
+        "type": "influxdb",
+        "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" },
-      "fieldConfig": { "defaults": { "unit": "m", "thresholds": { "mode": "absolute", "steps": [{ "color": "green", "value": null }] } }, "overrides": [] },
-      "gridPos": { "h": 4, "w": 5, "x": 19, "y": 1 },
+      "datasource": {
+        "type": "influxdb",
+        "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" },
-      "fieldConfig": { "defaults": { "unit": "m", "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
-      "gridPos": { "h": 8, "w": 12, "x": 0, "y": 6 },
+      "gridPos": {
+        "h": 1,
+        "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" },
-      "fieldConfig": { "defaults": { "unit": "m\u00b3", "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
-      "gridPos": { "h": 8, "w": 12, "x": 12, "y": 6 },
+      "datasource": {
+        "type": "influxdb",
+        "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" },
-      "fieldConfig": { "defaults": { "unit": "m\u00b3/h", "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
-      "gridPos": { "h": 8, "w": 12, "x": 0, "y": 15 },
+      "gridPos": {
+        "h": 1,
+        "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" },
-      "fieldConfig": { "defaults": { "unit": "m\u00b3/h", "custom": { "drawStyle": "line", "lineWidth": 2, "fillOpacity": 10 } }, "overrides": [] },
-      "gridPos": { "h": 8, "w": 12, "x": 12, "y": 15 },
+      "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": 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" },
-      "fieldConfig": { "defaults": { "unit": "m", "thresholds": { "mode": "absolute", "steps": [{ "color": "blue", "value": null }] } }, "overrides": [] },
-      "gridPos": { "h": 4, "w": 12, "x": 0, "y": 24 },
+      "gridPos": {
+        "h": 1,
+        "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" },
-      "fieldConfig": { "defaults": { "unit": "m\u00b3", "thresholds": { "mode": "absolute", "steps": [{ "color": "blue", "value": null }] } }, "overrides": [] },
-      "gridPos": { "h": 4, "w": 12, "x": 12, "y": 24 },
+      "datasource": {
+        "type": "influxdb",
+        "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": "bucket", "type": "custom", "query": "lvl2", "current": { "text": "lvl2", "value": "lvl2", "selected": false }, "options": [{ "text": "lvl2", "value": "lvl2", "selected": true }] }
+      {
+        "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
+          }
         ]
       },
-  "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,

src/specificClass.js

@@ -228,6 +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/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');
+});