feat: report editor

commit bfcf271a64c33a60f61f511cec2198d9c8a9c51a
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Wed Nov 26 12:32:40 2025 +0100

    wip

commit 8cd3b89fa3
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Tue Nov 25 22:33:58 2025 +0100

    funnel

commit 95af86dc44
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Tue Nov 25 22:23:25 2025 +0100

    wip

commit 727a218e6b
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Tue Nov 25 10:18:26 2025 +0100

    conversion wip

commit 958ba535d6
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Tue Nov 25 10:18:20 2025 +0100

    wip

commit 3bbeb927cc
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Tue Nov 25 09:18:48 2025 +0100

    wip

commit d99335e2f4
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Mon Nov 24 18:08:10 2025 +0100

    wip

commit 1fa61b1ae9
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Mon Nov 24 15:50:28 2025 +0100

    ts

commit 548747d826
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Mon Nov 24 13:17:01 2025 +0100

    fix typecheck events -> series

commit 7b18544085
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Mon Nov 24 13:06:46 2025 +0100

    fix report table

commit 57697a5a39
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Sat Nov 22 00:05:13 2025 +0100

    wip

commit 06fb6c4f3c
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Fri Nov 21 11:21:17 2025 +0100

    wip

commit dd71fd4e11
Author: Carl-Gerhard Lindesvärd <lindesvard@gmail.com>
Date:   Thu Nov 20 13:56:58 2025 +0100

    formulas

packages/db/src/engine/index.ts

@@ -0,0 +1,75 @@
+import { getPreviousMetric } from '@openpanel/common';
+
+import type { FinalChart, IChartInput } from '@openpanel/validation';
+import { getChartPrevStartEndDate } from '../services/chart.service';
+import {
+  getOrganizationSubscriptionChartEndDate,
+  getSettingsForProject,
+} from '../services/organization.service';
+import { compute } from './compute';
+import { fetch } from './fetch';
+import { format } from './format';
+import { normalize } from './normalize';
+import { plan } from './plan';
+import type { ConcreteSeries } from './types';
+
+/**
+ * Chart Engine - Main entry point
+ * Executes the pipeline: normalize -> plan -> fetch -> compute -> format
+ */
+export async function executeChart(input: IChartInput): Promise<FinalChart> {
+  // Stage 1: Normalize input
+  const normalized = await normalize(input);
+
+  // Handle subscription end date limit
+  const endDate = await getOrganizationSubscriptionChartEndDate(
+    input.projectId,
+    normalized.endDate,
+  );
+  if (endDate) {
+    normalized.endDate = endDate;
+  }
+
+  // Stage 2: Create execution plan
+  const executionPlan = await plan(normalized);
+
+  // Stage 3: Fetch data for event series (current period)
+  const fetchedSeries = await fetch(executionPlan);
+
+  // Stage 4: Compute formula series
+  const computedSeries = compute(fetchedSeries, executionPlan.definitions);
+
+  // Stage 5: Fetch previous period if requested
+  let previousSeries: ConcreteSeries[] | null = null;
+  if (input.previous) {
+    const currentPeriod = {
+      startDate: normalized.startDate,
+      endDate: normalized.endDate,
+    };
+    const previousPeriod = getChartPrevStartEndDate(currentPeriod);
+
+    const previousPlan = await plan({
+      ...normalized,
+      ...previousPeriod,
+    });
+
+    const previousFetched = await fetch(previousPlan);
+    previousSeries = compute(previousFetched, previousPlan.definitions);
+  }
+
+  // Stage 6: Format final output with previous period data
+  const includeAlphaIds = executionPlan.definitions.length > 1;
+  const response = format(
+    computedSeries,
+    executionPlan.definitions,
+    includeAlphaIds,
+    previousSeries,
+  );
+
+  return response;
+}
+
+// Export as ChartEngine for backward compatibility
+export const ChartEngine = {
+  execute: executeChart,
+};