react-openapi/src/hooks/useApi.ts

@@ -3,6 +3,24 @@ import axios, { AxiosInstance } from "axios";
 let apiClient: AxiosInstance | null = null;
 let _onUnauthorized: (() => void) | undefined;
 
+function serializeParams(params: Record<string, any>): string {
+  const searchParams = new URLSearchParams();
+  for (const [key, value] of Object.entries(params ?? {})) {
+    if (value === undefined || value === null) continue;
+    if (Array.isArray(value)) {
+      for (const item of value) searchParams.append(key, String(item));
+    } else if (typeof value === "object") {
+      for (const [nestedKey, nestedValue] of Object.entries(value)) {
+        if (nestedValue === undefined || nestedValue === null) continue;
+        searchParams.append(`${key}[${nestedKey}]`, String(nestedValue));
+      }
+    } else {
+      searchParams.append(key, String(value));
+    }
+  }
+  return searchParams.toString();
+}
+
 export function initApi(baseUrl: string, getToken?: () => string | null, onUnauthorized?: () => void): AxiosInstance {
   if (apiClient && apiClient.defaults.baseURL === baseUrl) {
     _onUnauthorized = onUnauthorized;
@@ -14,6 +32,7 @@ export function initApi(baseUrl: string, getToken?: () => string | null, onUnaut
   apiClient = axios.create({
     baseURL: baseUrl,
     headers: { "Content-Type": "application/json" },
+    paramsSerializer: serializeParams,
   });
 
   apiClient.interceptors.request.use((config) => {

src/Reports/GenerateReportPanel.tsx

@@ -5,78 +5,73 @@ import {
   Typography,
   TextField,
   Button,
-  IconButton,
   MenuItem,
   Select,
   FormControl,
   InputLabel,
   Autocomplete,
+  FormControlLabel,
+  Checkbox,
+  Chip,
   Alert,
 } from "@mui/material";
 import AddIcon from "@mui/icons-material/Add";
-import RemoveCircleOutlineIcon from "@mui/icons-material/RemoveCircleOutline";
 import { useResource, useAppContext, applyDisplayFormat } from "../../react-openapi";
 import { useToast } from "../ui/Toast";
 import { isDdmmyyyy } from "../common/utils/dates";
-import { apiErrorMessage, groupTypeEnum, periodHints } from "./types";
-
-interface GroupRow {
-  id: number;
-  group_type: string;
-  group_value: string;
-}
+import { apiErrorMessage, granularityOptions, groupDimOptions, FLOW_OPTIONS } from "./types";
 
 interface GenerateReportPanelProps {
-  onGenerated: (reports: any[]) => void;
+  onGenerated: (report: any) => void;
 }
 
+const ALL_GRANULARITIES = ["weekly", "monthly", "quarterly"];
+
 export function GenerateReportPanel({ onGenerated }: GenerateReportPanelProps) {
   const { schemas, resources } = useAppContext();
   const { create } = useResource("reports");
-  const { list: listEntities } = useResource("entities");
+  const { list: listAccounts } = useResource("accounts");
   const { showToast } = useToast();
 
-  const [rows, setRows] = useState<GroupRow[]>([{ id: 1, group_type: "monthly", group_value: "*" }]);
+  const [name, setName] = useState("");
+  const [granularities, setGranularities] = useState<string[]>(ALL_GRANULARITIES);
+  const [groupDims, setGroupDims] = useState<string[]>(["payee", "tag"]);
+  const [flow, setFlow] = useState("both");
+  const [accounts, setAccounts] = useState<string[]>([]);
+  const [ignoreSelf, setIgnoreSelf] = useState(true);
   const [startDate, setStartDate] = useState("");
   const [endDate, setEndDate] = useState("");
+  const [minAmount, setMinAmount] = useState("");
+  const [maxAmount, setMaxAmount] = useState("");
   const [submitting, setSubmitting] = useState(false);
   const [error, setError] = useState<string | null>(null);
-  const [entityNames, setEntityNames] = useState<string[]>([]);
+  const [accountOptions, setAccountOptions] = useState<string[]>([]);
   const [dateErrors, setDateErrors] = useState<{ start?: string; end?: string }>({});
 
-  const types = useMemo(() => groupTypeEnum(schemas), [schemas]);
-  const entitiesRes = resources.find((r) => r.name === "entities");
-  const entitiesFormat = entitiesRes?.displayFormat ?? "{name}";
+  const granularityChoices = useMemo(() => {
+    const enums = granularityOptions(schemas);
+    return enums.length ? enums : ALL_GRANULARITIES;
+  }, [schemas]);
+  const dimChoices = useMemo(() => groupDimOptions(schemas), [schemas]);
+  const accountsRes = resources.find((r) => r.name === "accounts");
+  const accountsFormat = accountsRes?.displayFormat ?? "{name}";
 
   useEffect(() => {
     let mounted = true;
-    listEntities({ limit: 0 }).then((res) => {
+    listAccounts({ limit: 0 }).then((res) => {
       if (!mounted) return;
       const names = (res.items ?? [])
-        .map((it: any) => applyDisplayFormat(it, entitiesFormat))
+        .map((it: any) => applyDisplayFormat(it, accountsFormat))
         .filter((n: string) => n);
-      setEntityNames([...new Set(names)].sort((a, b) => a.localeCompare(b)));
+      setAccountOptions([...new Set(names)].sort((a, b) => a.localeCompare(b)));
     });
     return () => {
       mounted = false;
     };
-  }, [listEntities, entitiesFormat]);
+  }, [listAccounts, accountsFormat]);
 
-  const isPayee = (type: string) => type === "payee";
-
-  const valueOptions = (row: GroupRow): string[] => ["*", ...(isPayee(row.group_type) ? entityNames : [])];
-
-  const valueHint = (row: GroupRow): string =>
-    isPayee(row.group_type) ? "Entity name, or * for all payees" : `e.g. ${periodHints(row.group_type).join(", ")}, or *`;
-
-  const nextRowId = () => Math.max(0, ...rows.map((r) => r.id)) + 1;
-
-  const addRow = () => setRows((rs) => [...rs, { id: nextRowId(), group_type: "monthly", group_value: "*" }]);
-
-  const removeRow = (id: number) => setRows((rs) => rs.filter((r) => r.id !== id));
-
-  const updateRow = (id: number, patch: Partial<GroupRow>) =>
-    setRows((rs) => rs.map((r) => (r.id === id ? { ...r, ...patch } : r)));
+  const toggle = (list: string[], value: string, setter: (v: string[]) => void) =>
+    setter(list.includes(value) ? list.filter((v) => v !== value) : [...list, value]);
 
   const validateDates = (): boolean => {
     const errs: { start?: string; end?: string } = {};
@@ -86,25 +81,47 @@ export function GenerateReportPanel({ onGenerated }: GenerateReportPanelProps) {
     return Object.keys(errs).length === 0;
   };
 
+  const parseAmount = (value: string): number | null => {
+    const trimmed = value.trim();
+    if (!trimmed) return null;
+    const n = Number(trimmed);
+    return Number.isFinite(n) ? n : null;
+  };
+
   const handleSubmit = async () => {
     if (!validateDates()) return;
     setError(null);
-    const groups = rows
-      .filter((r) => r.group_type && r.group_value.trim())
-      .map(({ group_type, group_value }) => ({ group_type, group_value: group_value.trim() }));
-    if (groups.length === 0) {
-      setError("At least one group is required");
+    const min = parseAmount(minAmount);
+    const max = parseAmount(maxAmount);
+    if (minAmount.trim() && min === null) {
+      setError("Min amount must be a number");
       return;
     }
-    setSubmitting(true);
-    const payload: Record<string, any> = { groups };
+    if (maxAmount.trim() && max === null) {
+      setError("Max amount must be a number");
+      return;
+    }
+    if (min !== null && max !== null && min > max) {
+      setError("Min amount cannot exceed max amount");
+      return;
+    }
+    const payload: Record<string, any> = {
+      name: name.trim(),
+      granularities,
+      group_dims: groupDims,
+      flow,
+      ignore_self: ignoreSelf,
+    };
+    if (accounts.length) payload.accounts = accounts;
     if (startDate.trim()) payload.start_date = startDate.trim();
     if (endDate.trim()) payload.end_date = endDate.trim();
+    if (min !== null) payload.min_amount = min;
+    if (max !== null) payload.max_amount = max;
+    setSubmitting(true);
     try {
       const created = await create(payload);
-      const list = Array.isArray(created) ? created : created ? [created] : [];
-      showToast(`Generated ${list.length} report${list.length === 1 ? "" : "s"}`);
-      onGenerated(list);
+      showToast(`Generated snapshot ${created?.name ? `“${created.name}”` : ""}`.trim() || "Generated snapshot");
+      onGenerated(created);
     } catch (e: any) {
       setError(apiErrorMessage(e));
     } finally {
@@ -118,8 +135,8 @@ export function GenerateReportPanel({ onGenerated }: GenerateReportPanelProps) {
         Generate report
       </Typography>
       <Typography variant="body2" color="text.secondary" sx={{ mt: 0.5, mb: 2 }}>
-        Choose the dimensions to snapshot. At least one group is required — with no period dimension the server
-        snapshots weekly, monthly and quarterly.
+        Define the snapshot's scope. Granularity, payee and tag are sliced at view time — the cube is built once and
+        every combination stays cheap to read.
       </Typography>
 
       {error && (
@@ -128,81 +145,128 @@ export function GenerateReportPanel({ onGenerated }: GenerateReportPanelProps) {
         </Alert>
       )}
 
-      <Box sx={{ display: "flex", flexDirection: "column", gap: 1.5 }}>
-        {rows.map((row) => (
-          <Box key={row.id} sx={{ display: "flex", gap: 1.5, alignItems: "flex-start" }}>
-            <FormControl size="small" sx={{ width: 180, flexShrink: 0 }}>
-              <InputLabel id={`group-type-${row.id}`}>Type</InputLabel>
-              <Select
-                labelId={`group-type-${row.id}`}
-                label="Type"
-                value={row.group_type}
-                onChange={(e) => updateRow(row.id, { group_type: e.target.value, group_value: "*" })}
-              >
-                {types.map((t) => (
-                  <MenuItem key={t} value={t}>
-                    {t}
-                  </MenuItem>
-                ))}
-              </Select>
-            </FormControl>
-            <Autocomplete
-              freeSolo
-              size="small"
-              sx={{ flex: 1, minWidth: 240 }}
-              options={valueOptions(row)}
-              value={row.group_value}
-              onInputChange={(_, newVal) => updateRow(row.id, { group_value: newVal ?? "" })}
-              renderInput={(params) => (
-                <TextField {...params} label="Value" helperText={valueHint(row)} />
-              )}
-            />
-            <IconButton
-              aria-label="Remove group"
-              disabled={rows.length === 1}
-              onClick={() => removeRow(row.id)}
-              sx={{ mt: 0.25 }}
-            >
-              <RemoveCircleOutlineIcon />
-            </IconButton>
+      <Box sx={{ display: "flex", flexDirection: "column", gap: 2 }}>
+        <TextField
+          size="small"
+          label="Name"
+          placeholder="e.g. Monthly spending"
+          value={name}
+          onChange={(e) => setName(e.target.value)}
+          sx={{ maxWidth: 420 }}
+        />
+
+        <Box>
+          <Typography variant="subtitle2" sx={{ mb: 0.5 }}>
+            Granularities
+          </Typography>
+          <Box sx={{ display: "flex", gap: 1, flexWrap: "wrap" }}>
+            {granularityChoices.map((g) => (
+              <Chip
+                key={g}
+                label={g}
+                clickable
+                color={granularities.includes(g) ? "primary" : "default"}
+                variant={granularities.includes(g) ? "filled" : "outlined"}
+                onClick={() => toggle(granularities, g, setGranularities)}
+              />
+            ))}
           </Box>
-        ))}
-      </Box>
+        </Box>
 
-      <Button startIcon={<AddIcon />} size="small" sx={{ mt: 1 }} onClick={addRow}>
-        Add dimension
-      </Button>
+        <Box>
+          <Typography variant="subtitle2" sx={{ mb: 0.5 }}>
+            Group dimensions
+          </Typography>
+          <Box sx={{ display: "flex", gap: 1, flexWrap: "wrap" }}>
+            {dimChoices.map((d) => (
+              <Chip
+                key={d}
+                label={d}
+                clickable
+                color={groupDims.includes(d) ? "primary" : "default"}
+                variant={groupDims.includes(d) ? "filled" : "outlined"}
+                onClick={() => toggle(groupDims, d, setGroupDims)}
+              />
+            ))}
+          </Box>
+        </Box>
 
-      <Box sx={{ display: "flex", gap: 1.5, mt: 2, flexWrap: "wrap" }}>
-        <TextField
+        <Box sx={{ display: "flex", gap: 1.5, flexWrap: "wrap", alignItems: "flex-start" }}>
+          <FormControl size="small" sx={{ width: 200 }}>
+            <InputLabel id="flow-label">Flow</InputLabel>
+            <Select labelId="flow-label" label="Flow" value={flow} onChange={(e) => setFlow(e.target.value)}>
+              {FLOW_OPTIONS.map((f) => (
+                <MenuItem key={f} value={f}>
+                  {f}
+                </MenuItem>
+              ))}
+            </Select>
+          </FormControl>
+          <FormControlLabel
+            control={<Checkbox checked={ignoreSelf} onChange={(e) => setIgnoreSelf(e.target.checked)} />}
+            label="Ignore self-transfers"
+            sx={{ mt: 0.25 }}
+          />
+        </Box>
+
+        <Autocomplete
+          multiple
+          freeSolo
           size="small"
-          label="Start date"
-          placeholder="DD-MM-YYYY"
-          value={startDate}
-          onChange={(e) => setStartDate(e.target.value)}
-          error={Boolean(dateErrors.start)}
-          helperText={dateErrors.start ?? "Inclusive start (empty = unbounded)"}
-          sx={{ width: 200 }}
-        />
-        <TextField
-          size="small"
-          label="End date"
-          placeholder="DD-MM-YYYY"
-          value={endDate}
-          onChange={(e) => setEndDate(e.target.value)}
-          error={Boolean(dateErrors.end)}
-          helperText={dateErrors.end ?? "Inclusive end (empty = unbounded)"}
-          sx={{ width: 200 }}
+          options={accountOptions}
+          value={accounts}
+          onChange={(_, newVal) => setAccounts(newVal)}
+          renderInput={(params) => (
+            <TextField {...params} label="Accounts" placeholder="Restrict to accounts (empty = all)" />
+          )}
+          sx={{ maxWidth: 420 }}
         />
+
+        <Box sx={{ display: "flex", gap: 1.5, flexWrap: "wrap" }}>
+          <TextField
+            size="small"
+            label="Start date"
+            placeholder="DD-MM-YYYY"
+            value={startDate}
+            onChange={(e) => setStartDate(e.target.value)}
+            error={Boolean(dateErrors.start)}
+            helperText={dateErrors.start ?? "Inclusive start (empty = unbounded)"}
+            sx={{ width: 200 }}
+          />
+          <TextField
+            size="small"
+            label="End date"
+            placeholder="DD-MM-YYYY"
+            value={endDate}
+            onChange={(e) => setEndDate(e.target.value)}
+            error={Boolean(dateErrors.end)}
+            helperText={dateErrors.end ?? "Inclusive end (empty = unbounded)"}
+            sx={{ width: 200 }}
+          />
+        </Box>
+
+        <Box sx={{ display: "flex", gap: 1.5, flexWrap: "wrap" }}>
+          <TextField
+            size="small"
+            label="Min amount"
+            placeholder="e.g. 500"
+            value={minAmount}
+            onChange={(e) => setMinAmount(e.target.value)}
+            sx={{ width: 200 }}
+          />
+          <TextField
+            size="small"
+            label="Max amount"
+            placeholder="e.g. 5000"
+            value={maxAmount}
+            onChange={(e) => setMaxAmount(e.target.value)}
+            sx={{ width: 200 }}
+          />
+        </Box>
       </Box>
 
       <Box sx={{ mt: 2, display: "flex", justifyContent: "flex-end" }}>
-        <Button
-          variant="contained"
-          startIcon={<AddIcon />}
-          onClick={handleSubmit}
-          disabled={submitting}
-        >
+        <Button variant="contained" startIcon={<AddIcon />} onClick={handleSubmit} disabled={submitting}>
           {submitting ? "Generating…" : "Generate"}
         </Button>
       </Box>

src/Reports/Report.tsx

@@ -11,7 +11,7 @@ import {
 } from "@mui/material";
 import ExpandMoreIcon from "@mui/icons-material/ExpandMore";
 import AssessmentIcon from "@mui/icons-material/Assessment";
-import { useResource, useAppContext, formatCurrency } from "../../react-openapi";
+import { useResource, useAppContext } from "../../react-openapi";
 import { useToast } from "../ui/Toast";
 import { PageHeader } from "../ui/PageHeader";
 import { EmptyState } from "../ui/EmptyState";
@@ -45,22 +45,19 @@ export default function Report() {
   }, [load]);
 
   const handleGenerated = useCallback(
-    (created: any[]) => {
+    (created: any) => {
       load();
-      if (created?.[0]?.id) setSelectedId(created[0].id);
+      if (created?.id) setSelectedId(created.id);
     },
     [load],
   );
 
   const handleRegenerate = useCallback(
     async (report: any) => {
-      const payload: Record<string, any> = { groups: report.groups ?? [] };
-      if (report.start_date) payload.start_date = report.start_date;
-      if (report.end_date) payload.end_date = report.end_date;
       try {
-        await create(payload);
+        const created = await create(report.query ?? {});
         showToast("Report regenerated");
-        setSelectedId(report.id);
+        setSelectedId(created?.id ?? report.id);
         setViewerVersion((v) => v + 1);
         load();
       } catch (e: any) {
@@ -86,9 +83,9 @@ export default function Report() {
 
   const summary = useMemo(() => {
     const rows = reports ?? [];
-    const txnCount = rows.reduce((s, r) => s + (r.txn_count ?? 0), 0);
-    const total = rows.reduce((s, r) => s + (typeof r.metrics?.sum === "number" ? r.metrics.sum : 0), 0);
-    return { count: rows.length, txnCount, total };
+    const granularities = new Set<string>();
+    for (const r of rows) for (const g of r.query?.granularities ?? []) granularities.add(g);
+    return { count: rows.length, granularities: [...granularities].join(", ") };
   }, [reports]);
 
   return (
@@ -96,7 +93,7 @@ export default function Report() {
       <PageHeader
         crumbs={[{ label: "Home", path: "/" }, { label: "Reports" }]}
         title="Reports"
-        subtitle="Generate period/payee snapshots from the reporting API and slice the cached data."
+        subtitle="Build an immutable snapshot cube once, then slice by granularity, period, payee and tag at view time."
       />
 
       {error && (
@@ -107,8 +104,7 @@ export default function Report() {
 
       <Box sx={{ display: "flex", gap: 2, flexWrap: "wrap", mb: 4 }}>
         <StatCard label="Reports" value={summary.count.toLocaleString("en-IN")} />
-        <StatCard label="Transactions covered" value={summary.txnCount.toLocaleString("en-IN")} />
-        <StatCard label="Total" value={formatCurrency(summary.total, "INR")} />
+        <StatCard label="Granularities covered" value={summary.granularities || "—"} />
       </Box>
 
       <GenerateReportPanel onGenerated={handleGenerated} />
@@ -154,7 +150,7 @@ export default function Report() {
               <EmptyState
                 icon={<AssessmentIcon />}
                 title="No reports yet"
-                description="Generate your first report above — pick a granularity and payee (a payee-only or wildcard config snapshots weekly, monthly and quarterly)."
+                description="Generate your first snapshot above — choose granularities and grouping dimensions, then slice the cached cube by period, payee and tag."
               />
             </Paper>
           ) : (

src/Reports/ReportList.tsx

@@ -3,7 +3,7 @@ import { Box, Paper, Typography, Button, IconButton, Skeleton, Tooltip } from "@
 import DeleteOutlineIcon from "@mui/icons-material/DeleteOutline";
 import VisibilityIcon from "@mui/icons-material/Visibility";
 import CachedIcon from "@mui/icons-material/Cached";
-import { ListCellRenderer, formatCurrency } from "../../react-openapi";
+import { ListCellRenderer } from "../../react-openapi";
 import type { ReportFieldConfigs } from "./types";
 
 interface ReportListProps {
@@ -30,10 +30,14 @@ export function ReportList({ reports, loading, fields, selectedId, onView, onReg
   return (
     <Box sx={{ display: "flex", flexDirection: "column", gap: 1.5 }}>
       {reports.map((report) => {
-        const sum = typeof report.metrics?.sum === "number" ? report.metrics.sum : null;
-        const range =
-          report.start_date || report.end_date
-            ? `range ${report.start_date || "…"} → ${report.end_date || "…"}`
+        const q = report.query ?? {};
+        const range = q.start_date || q.end_date ? `range ${q.start_date || "…"} → ${q.end_date || "…"}` : null;
+        const dims = Array.isArray(q.group_dims) ? q.group_dims.join(", ") : "";
+        const granularities = Array.isArray(q.granularities) ? q.granularities.join(", ") : "";
+        const accounts = Array.isArray(q.accounts) ? `${q.accounts.length} account${q.accounts.length === 1 ? "" : "s"}` : "all accounts";
+        const amounts =
+          q.min_amount != null || q.max_amount != null
+            ? `amount ${q.min_amount ?? "0"} → ${q.max_amount ?? "∞"}`
             : null;
         return (
           <Paper
@@ -50,20 +54,17 @@ export function ReportList({ reports, loading, fields, selectedId, onView, onReg
             <Box sx={{ display: "flex", alignItems: "center", gap: 2, flexWrap: "wrap" }}>
               <Box sx={{ flex: "1 1 260px", minWidth: 0 }}>
                 <Typography variant="body1" fontWeight={600} noWrap sx={{ fontSize: "0.9375rem" }}>
-                  {report.group_label}
+                  {report.name || report.id}
                 </Typography>
                 <Box sx={{ display: "flex", alignItems: "center", gap: 1, flexWrap: "wrap", mt: 0.25 }}>
-                  {fields && (
-                    <ListCellRenderer field={fields.granularity} value={report.granularity} />
-                  )}
                   <Typography variant="caption" color="text.secondary">
-                    {report.period_label}
+                    {granularities}
                   </Typography>
                   <Typography variant="caption" color="text.disabled">
                     /
                   </Typography>
                   <Typography variant="caption" color="text.secondary">
-                    {report.payee}
+                    {dims}
                   </Typography>
                   {range && (
                     <Typography variant="caption" color="text.disabled">
@@ -73,14 +74,13 @@ export function ReportList({ reports, loading, fields, selectedId, onView, onReg
                 </Box>
                 <Box sx={{ display: "flex", gap: 1.5, mt: 0.5 }}>
                   <Typography variant="caption" color="text.secondary">
-                    {report.entity_count ?? 0} entities
-                  </Typography>
-                  <Typography variant="caption" color="text.secondary">
-                    {report.txn_count ?? 0} txns
-                  </Typography>
-                  <Typography variant="caption" color="text.secondary">
-                    {report.expense_count ?? 0} expenses
+                    {accounts}
                   </Typography>
+                  {amounts && (
+                    <Typography variant="caption" color="text.secondary">
+                      {amounts}
+                    </Typography>
+                  )}
                   {fields && (
                     <Box sx={{ color: "text.secondary" }}>
                       <ListCellRenderer field={fields.generatedAt} value={report.generated_at} />
@@ -89,12 +89,6 @@ export function ReportList({ reports, loading, fields, selectedId, onView, onReg
                 </Box>
               </Box>
 
-              <Box sx={{ flexShrink: 0, textAlign: "right" }}>
-                <Typography variant="body1" fontWeight={700} sx={{ letterSpacing: "-0.01em" }}>
-                  {sum != null ? formatCurrency(sum, "INR") : "—"}
-                </Typography>
-              </Box>
-
               <Box sx={{ display: "flex", gap: 0.5, flexShrink: 0 }}>
                 <Button size="small" variant="contained" startIcon={<VisibilityIcon />} onClick={() => onView(report.id)}>
                   View

src/Reports/ReportViewer.tsx

@@ -1,13 +1,5 @@
-import React, { useEffect, useMemo, useState } from "react";
-import {
-  Box,
-  Paper,
-  Typography,
-  Button,
-  IconButton,
-  Alert,
-  Skeleton,
-} from "@mui/material";
+import React, { useEffect, useMemo, useRef, useState } from "react";
+import { Box, Paper, Typography, Button, IconButton, Alert, Skeleton, Chip, MenuItem, Select, FormControl, InputLabel } from "@mui/material";
 import CloseIcon from "@mui/icons-material/Close";
 import CachedIcon from "@mui/icons-material/Cached";
 import { FkMultiSelectField, useResource, formatCurrency } from "../../react-openapi";
@@ -16,7 +8,7 @@ import { StatCard } from "../common/components/StatCard";
 import { TransactionList } from "../common/components/TransactionList";
 import type { TxnFieldConfigs } from "../common/types";
 import { toPeriodGranularity } from "../common/utils/transactions";
-import { aggregateSlice } from "./types";
+import { aggregateSlice, periodSlices, FLOW_OPTIONS, apiErrorMessage } from "./types";
 
 const periodField: FieldConfig = {
   name: "period",
@@ -46,6 +38,20 @@ const payeeField: FieldConfig = {
   isArray: true,
 };
 
+const tagField: FieldConfig = {
+  name: "tag",
+  label: "Tag",
+  description: "",
+  type: "string",
+  order: 0,
+  hidden: {},
+  filterable: true,
+  sortable: false,
+  readOnly: false,
+  required: false,
+  isArray: true,
+};
+
 interface ReportViewerProps {
   id: string;
   version: number;
@@ -54,6 +60,15 @@ interface ReportViewerProps {
   onRegenerated: (report: any) => void;
 }
 
+function snapshotGranularities(report: any): string[] {
+  const fromQuery = report?.query?.granularities;
+  if (Array.isArray(fromQuery) && fromQuery.length) return fromQuery;
+  const fromResponse = report?.granularities;
+  if (Array.isArray(fromResponse) && fromResponse.length) return fromResponse;
+  const series = report?.buckets?.[0]?.series;
+  return series ? Object.keys(series) : [];
+}
+
 export function ReportViewer({ id, version, fields, onClose, onRegenerated }: ReportViewerProps) {
   const { get } = useResource("reports");
 
@@ -61,23 +76,39 @@ export function ReportViewer({ id, version, fields, onClose, onRegenerated }: Re
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
   const [reload, setReload] = useState(0);
+  const [granularity, setGranularity] = useState<string | null>(null);
+  const [flow, setFlow] = useState("outflows");
   const [selectedPeriods, setSelectedPeriods] = useState<string[]>([]);
   const [selectedPayees, setSelectedPayees] = useState<string[]>([]);
+  const [selectedTags, setSelectedTags] = useState<string[]>([]);
+  const prevGranularity = useRef<string | null>(null);
+
+  const params = useMemo(() => {
+    const p: Record<string, any> = { flow };
+    if (granularity) p.granularity = [granularity];
+    if (selectedPeriods.length) p.period_ids = selectedPeriods;
+    if (selectedPayees.length) p.payee = selectedPayees;
+    if (selectedTags.length) p.tags = selectedTags;
+    return p;
+  }, [granularity, flow, selectedPeriods, selectedPayees, selectedTags]);
 
   useEffect(() => {
     let mounted = true;
     setLoading(true);
     setError(null);
-    get(id)
+    const previous = prevGranularity.current;
+    get(id, params)
       .then((res) => {
         if (!mounted) return;
         setReport(res);
-        setSelectedPeriods([]);
-        setSelectedPayees([]);
+        const options = snapshotGranularities(res);
+        if (granularity === null && options.length) setGranularity(options[0]);
+        if (previous !== null && previous !== granularity) setSelectedPeriods([]);
+        prevGranularity.current = granularity;
       })
       .catch((e: any) => {
         if (!mounted) return;
-        setError(e?.response?.data?.detail ?? e?.message ?? "Failed to load report");
+        setError(apiErrorMessage(e));
       })
       .finally(() => {
         if (mounted) setLoading(false);
@@ -85,34 +116,37 @@ export function ReportViewer({ id, version, fields, onClose, onRegenerated }: Re
     return () => {
       mounted = false;
     };
-  }, [id, version, reload, get]);
+  }, [id, version, reload, params, get, granularity]);
 
-  const data = useMemo(() => (Array.isArray(report?.data) ? report.data : null), [report]);
-
-  const groupOptions = useMemo(() => {
-    const options = report?.metadata?.group_options;
-    if (!options || typeof options !== "object") return { period: [], payee: [] };
-    return {
-      period: Array.isArray(options.period) ? options.period.map(String) : [],
-      payee: Array.isArray(options.payee) ? options.payee.map(String) : [],
-    };
-  }, [report]);
+  const granularityOptions = useMemo(() => snapshotGranularities(report), [report]);
 
   const periodOptions = useMemo(
-    () => groupOptions.period.map((label: string) => ({ value: label, label })),
-    [groupOptions],
+    () => (Array.isArray(report?.period_ids) ? report.period_ids.map((label: string) => ({ value: label, label })) : []),
+    [report],
   );
   const payeeOptions = useMemo(
-    () => groupOptions.payee.map((label: string) => ({ value: label, label })),
-    [groupOptions],
+    () => (Array.isArray(report?.payees) ? report.payees.map((label: string) => ({ value: label, label })) : []),
+    [report],
+  );
+  const tagOptions = useMemo(
+    () => (Array.isArray(report?.tags) ? report.tags.map((label: string) => ({ value: label, label })) : []),
+    [report],
   );
 
-  const slice = useMemo(
-    () => aggregateSlice(data ?? [], { periods: selectedPeriods, payees: selectedPayees }),
-    [data, selectedPeriods, selectedPayees],
+  const filter = useMemo(
+    () => ({
+      granularity: granularity ?? granularityOptions[0] ?? "",
+      periods: selectedPeriods,
+      payees: selectedPayees,
+      tags: selectedTags,
+    }),
+    [granularity, granularityOptions, selectedPeriods, selectedPayees, selectedTags],
   );
 
-  if (loading) {
+  const slice = useMemo(() => aggregateSlice(report?.buckets ?? [], filter), [report, filter]);
+  const bars = useMemo(() => periodSlices(report?.buckets ?? [], filter), [report, filter]);
+
+  if (loading && !report) {
     return (
       <Paper variant="outlined" sx={{ p: 2.5, borderRadius: 3 }}>
         <Skeleton variant="text" width={220} height={28} />
@@ -137,6 +171,13 @@ export function ReportViewer({ id, version, fields, onClose, onRegenerated }: Re
 
   if (!report) return null;
 
+  const activeGranularity = granularity ?? report.granularities?.[0] ?? "";
+  const maxBar = bars.reduce((m, b) => Math.max(m, b.sum), 0);
+  const range =
+    report.query?.start_date || report.query?.end_date
+      ? `range ${report.query.start_date || "…"} → ${report.query.end_date || "…"}`
+      : null;
+
   return (
     <Paper variant="outlined" sx={{ borderRadius: 3, overflow: "hidden" }}>
       <Box
@@ -153,77 +194,137 @@ export function ReportViewer({ id, version, fields, onClose, onRegenerated }: Re
       >
         <Box sx={{ flex: 1, minWidth: 0 }}>
           <Typography variant="h6" fontWeight={700} sx={{ letterSpacing: "-0.01em" }}>
-            {report.group_label}
+            {report.name}
           </Typography>
           <Box sx={{ display: "flex", gap: 1.5, flexWrap: "wrap" }}>
             <Typography variant="caption" color="text.secondary">
-              {report.granularity} · {report.period_label} · {report.payee}
+              flow {report.flow} · generated {report.generated_at ?? report.created_at}
             </Typography>
-            <Typography variant="caption" color="text.disabled">
-              {report.entity_count ?? 0} entities · {report.txn_count ?? 0} txns · {report.expense_count ?? 0} expenses
-            </Typography>
-            {report.start_date || report.end_date ? (
+            {range && (
               <Typography variant="caption" color="text.disabled">
-                range {report.start_date || "…"} → {report.end_date || "…"}
+                {range}
               </Typography>
-            ) : null}
+            )}
+            <Typography variant="caption" color="text.disabled">
+              {report.payees?.length ?? 0} payees · {report.tags?.length ?? 0} tags
+            </Typography>
           </Box>
         </Box>
+        <IconButton aria-label="Regenerate report" onClick={() => onRegenerated(report)}>
+          <CachedIcon />
+        </IconButton>
         <IconButton aria-label="Close report" onClick={onClose}>
           <CloseIcon />
         </IconButton>
       </Box>
 
-      {data === null ? (
-        <Box sx={{ p: 3 }}>
-          <Alert severity="info" sx={{ borderRadius: 2, mb: 2 }}>
-            The cached data for this report has expired. Regenerate it to rebuild the snapshot.
-          </Alert>
-          <Button variant="contained" startIcon={<CachedIcon />} onClick={() => onRegenerated(report)}>
-            Regenerate
-          </Button>
+      <Box sx={{ p: 2.5 }}>
+        <Box sx={{ display: "flex", gap: 1.5, flexWrap: "wrap", alignItems: "center", mb: 2 }}>
+          <Box sx={{ display: "flex", gap: 0.5, flexWrap: "wrap" }}>
+            {granularityOptions.map((g: string) => (
+              <Chip
+                key={g}
+                label={g}
+                clickable
+                size="small"
+                color={activeGranularity === g ? "primary" : "default"}
+                variant={activeGranularity === g ? "filled" : "outlined"}
+                onClick={() => setGranularity(g)}
+              />
+            ))}
+          </Box>
+          <FormControl size="small" sx={{ width: 140 }}>
+            <InputLabel id="viewer-flow-label">Flow</InputLabel>
+            <Select labelId="viewer-flow-label" label="Flow" value={flow} onChange={(e) => setFlow(e.target.value)}>
+              {FLOW_OPTIONS.map((f) => (
+                <MenuItem key={f} value={f}>
+                  {f}
+                </MenuItem>
+              ))}
+            </Select>
+          </FormControl>
         </Box>
-      ) : (
-        <Box sx={{ p: 2.5 }}>
-          <Box sx={{ display: "flex", gap: 1.5, flexWrap: "wrap", mb: 2.5 }}>
-            <Box sx={{ width: 260 }}>
-              <FkMultiSelectField
-                field={{ ...periodField, readOnly: groupOptions.period.length === 0 }}
-                fkOptions={periodOptions}
-                value={selectedPeriods}
-                onChange={setSelectedPeriods}
-              />
-            </Box>
-            <Box sx={{ width: 260 }}>
-              <FkMultiSelectField
-                field={{ ...payeeField, readOnly: groupOptions.payee.length === 0 }}
-                fkOptions={payeeOptions}
-                value={selectedPayees}
-                onChange={setSelectedPayees}
-              />
-            </Box>
-            <Typography variant="body2" color="text.secondary" sx={{ alignSelf: "center" }}>
-              Showing {slice.count} transactions across {slice.txns.length} rows
+
+        <Box sx={{ display: "flex", gap: 1.5, flexWrap: "wrap", mb: 2.5 }}>
+          <Box sx={{ width: 260 }}>
+            <FkMultiSelectField
+              field={{ ...periodField, readOnly: periodOptions.length === 0 }}
+              fkOptions={periodOptions}
+              value={selectedPeriods}
+              onChange={setSelectedPeriods}
+            />
+          </Box>
+          <Box sx={{ width: 260 }}>
+            <FkMultiSelectField
+              field={{ ...payeeField, readOnly: payeeOptions.length === 0 }}
+              fkOptions={payeeOptions}
+              value={selectedPayees}
+              onChange={setSelectedPayees}
+            />
+          </Box>
+          <Box sx={{ width: 260 }}>
+            <FkMultiSelectField
+              field={{ ...tagField, readOnly: tagOptions.length === 0 }}
+              fkOptions={tagOptions}
+              value={selectedTags}
+              onChange={setSelectedTags}
+            />
+          </Box>
+          <Typography variant="body2" color="text.secondary" sx={{ alignSelf: "center" }}>
+            {slice.txns.length} transactions · {slice.count} rows
+          </Typography>
+        </Box>
+
+        <Box sx={{ display: "flex", gap: 2, flexWrap: "wrap", mb: 2.5 }}>
+          <StatCard label="Outflows" value={formatCurrency(slice.spent, slice.currency)} color="error.main" />
+          <StatCard label="Inflows" value={formatCurrency(slice.income, slice.currency)} color="success.main" />
+          <StatCard label="Net" value={formatCurrency(slice.income - slice.spent, slice.currency)} color="info.main" />
+          <StatCard label="Transactions" value={slice.count.toLocaleString("en-IN")} />
+        </Box>
+
+        {bars.length === 0 ? (
+          <Paper variant="outlined" sx={{ borderRadius: 2, p: 3, mb: 2.5 }}>
+            <Typography variant="body2" color="text.secondary">
+              No data for this slice. Try another granularity, period or payer.
             </Typography>
-          </Box>
+          </Paper>
+        ) : (
+          <Paper variant="outlined" sx={{ borderRadius: 2, p: 2, mb: 2.5 }}>
+            {bars.map((b) => (
+              <Box key={b.periodId} sx={{ display: "flex", alignItems: "center", gap: 1.5, py: 0.75 }}>
+                <Typography variant="caption" sx={{ width: 110, flexShrink: 0, textAlign: "right" }}>
+                  {b.periodId}
+                </Typography>
+                <Box
+                  sx={{
+                    height: 20,
+                    borderRadius: 1,
+                    bgcolor: flow === "outflows" ? "error.main" : "success.main",
+                    opacity: 0.85,
+                    minWidth: 4,
+                  }}
+                  style={{ width: `${maxBar ? Math.max((b.sum / maxBar) * 100, 2) : 2}%` }}
+                />
+                <Typography variant="body2" fontWeight={600}>
+                  {formatCurrency(b.sum, slice.currency)}
+                </Typography>
+                <Typography variant="caption" color="text.disabled">
+                  {b.count} txn{b.count === 1 ? "" : "s"}
+                </Typography>
+              </Box>
+            ))}
+          </Paper>
+        )}
 
-          <Box sx={{ display: "flex", gap: 2, flexWrap: "wrap", mb: 2.5 }}>
-            <StatCard label="Outflows" value={formatCurrency(slice.spent, slice.currency)} color="error.main" />
-            <StatCard label="Inflows" value={formatCurrency(slice.income, slice.currency)} color="success.main" />
-            <StatCard label="Transactions" value={slice.count.toLocaleString("en-IN")} />
-          </Box>
-
-          {slice.txns.length === 0 ? (
-            <Paper variant="outlined" sx={{ borderRadius: 2, p: 3 }}>
-              <Typography variant="body2" color="text.secondary">
-                No transactions in this slice.
-              </Typography>
-            </Paper>
-          ) : fields ? (
-            <TransactionList items={slice.txns} fields={fields} granularity={toPeriodGranularity(report.granularity)} showMetrics />
-          ) : null}
-        </Box>
-      )}
+        {slice.txns.length === 0 ? null : fields ? (
+          <TransactionList
+            items={slice.txns}
+            fields={fields}
+            granularity={toPeriodGranularity(activeGranularity)}
+            showMetrics
+          />
+        ) : null}
+      </Box>
     </Paper>
   );
 }

src/Reports/types.ts

@@ -1,23 +1,4 @@
 import type { FieldConfig, ResourceConfig } from "../../react-openapi";
-import { parseDdmmyyyy } from "../common/utils/dates";
-
-export interface ParsedGroupKey {
-  period?: { granularity: string; label: string };
-  payee?: { label: string };
-  range?: { start?: string; end?: string };
-}
-
-export interface ReportGroupLike {
-  key: string;
-  group_label?: string;
-  metrics?: Record<string, any>;
-  txns?: any[];
-}
-
-export interface SliceFilter {
-  periods?: string[];
-  payees?: string[];
-}
 
 export interface SliceSummary {
   sum: number;
@@ -33,12 +14,23 @@ export interface SliceSummary {
   currency: string;
 }
 
+export interface SliceFilter {
+  granularity: string;
+  periods?: string[];
+  payees?: string[];
+  tags?: string[];
+}
+
+export interface PeriodSlice {
+  periodId: string;
+  sum: number;
+  count: number;
+  firstDate: string | null;
+  lastDate: string | null;
+}
+
 export interface ReportFieldConfigs {
-  groupLabel: FieldConfig;
-  granularity: FieldConfig;
-  periodLabel: FieldConfig;
-  payee: FieldConfig;
-  entityCount: FieldConfig;
+  name: FieldConfig;
   generatedAt: FieldConfig;
 }
 
@@ -48,23 +40,6 @@ export interface MetricLabel {
   order: number;
 }
 
-/** Split a concrete cache key into its dimension parts, e.g. `period:monthly:2026-Jan|payee:Zepto`. */
-export function parseCacheKey(key: string): ParsedGroupKey {
-  const out: ParsedGroupKey = {};
-  for (const dim of key.split("|")) {
-    if (!dim) continue;
-    const [name, ...rest] = dim.split(":");
-    if (name === "period" && rest.length >= 2) {
-      out.period = { granularity: rest[0], label: rest.slice(1).join(":") };
-    } else if (name === "payee" && rest.length >= 1) {
-      out.payee = { label: rest.join(":") };
-    } else if (name === "range" && rest.length >= 1) {
-      out.range = { start: rest[0] || undefined, end: rest[1] || undefined };
-    }
-  }
-  return out;
-}
-
 export function apiErrorMessage(e: any): string {
   if (e?.response?.data) {
     const d = e.response.data;
@@ -76,15 +51,16 @@ export function apiErrorMessage(e: any): string {
   return e?.message ?? "Request failed";
 }
 
-export function groupTypeEnum(schemas: Record<string, any>): string[] {
-  return schemas?.GroupSpec?.properties?.group_type?.enum ?? [];
+export function granularityOptions(schemas: Record<string, any>): string[] {
+  return schemas?.ReportQuery?.properties?.granularities?.items?.enum ?? [];
 }
 
-export function groupValueFk(schemas: Record<string, any>): { resource?: string; prefetch?: boolean } | null {
-  const fk = schemas?.GroupSpec?.properties?.group_value?.["x-fk"];
-  return fk && typeof fk === "object" ? fk : null;
+export function groupDimOptions(schemas: Record<string, any>): string[] {
+  return schemas?.ReportQuery?.properties?.group_dims?.items?.enum ?? ["payee", "tag"];
 }
 
+export const FLOW_OPTIONS = ["both", "inflows", "outflows"];
+
 export function metricLabels(schemas: Record<string, any>): MetricLabel[] {
   const props: Record<string, any> = schemas?.ReportMetrics?.properties ?? {};
   return Object.entries(props)
@@ -97,42 +73,47 @@ export function metricLabels(schemas: Record<string, any>): MetricLabel[] {
     .sort((a, b) => a.order - b.order);
 }
 
-export function periodHints(granularity: string): string[] {
-  const y = new Date().getFullYear();
-  switch (granularity) {
-    case "weekly":
-      return [`${y}-W01`, `${y}-W26`];
-    case "monthly":
-      return [`${y}-Jan`, `${y}-Feb`];
-    case "quarterly":
-      return [`${y}-Jan-Mar`, `${y}-Apr-Jun`];
-    case "yearly":
-      return [`${y - 1}`, `${y}`];
-    default:
-      return [`${y}-Jan`, `${y}-W01`, `${y}-Jan-Mar`, `${y}`];
-  }
-}
-
 function dateVal(value: string): number {
-  try {
-    return parseDdmmyyyy(value).getTime();
-  } catch {
-    return 0;
-  }
+  const t = new Date(value).getTime();
+  return Number.isNaN(t) ? 0 : t;
 }
 
-export function groupMatches(group: ReportGroupLike, filter: SliceFilter): boolean {
-  const key = parseCacheKey(group.key);
-  if (filter.periods && filter.periods.length > 0) {
-    if (!key.period || !filter.periods.includes(key.period.label)) return false;
-  }
-  if (filter.payees && filter.payees.length > 0) {
-    if (!key.payee || !filter.payees.includes(key.payee.label)) return false;
-  }
+function bucketMatches(bucket: any, filter: SliceFilter): boolean {
+  const gk = bucket?.group_key ?? {};
+  if (filter.payees?.length && !(gk.payee ?? []).some((p: string) => filter.payees?.includes(p))) return false;
+  if (filter.tags?.length && !(gk.tag ?? []).some((t: string) => filter.tags?.includes(t))) return false;
   return true;
 }
 
-export function aggregateSlice(groups: ReportGroupLike[], filter: SliceFilter): SliceSummary {
+export function periodSlices(buckets: any[], filter: SliceFilter): PeriodSlice[] {
+  const byPeriod = new Map<string, PeriodSlice>();
+  for (const bucket of buckets ?? []) {
+    if (!bucketMatches(bucket, filter)) continue;
+    for (const period of bucket.series?.[filter.granularity] ?? []) {
+      if (filter.periods?.length && !filter.periods.includes(period.period_id)) continue;
+      const m = period.metrics ?? {};
+      const cur = byPeriod.get(period.period_id) ?? {
+        periodId: period.period_id,
+        sum: 0,
+        count: 0,
+        firstDate: null,
+        lastDate: null,
+      };
+      cur.sum += typeof m.sum === "number" ? m.sum : 0;
+      cur.count += typeof m.count === "number" ? m.count : 0;
+      if (m.first_date && (!cur.firstDate || dateVal(String(m.first_date)) < dateVal(cur.firstDate))) {
+        cur.firstDate = String(m.first_date);
+      }
+      if (m.last_date && (!cur.lastDate || dateVal(String(m.last_date)) > dateVal(cur.lastDate))) {
+        cur.lastDate = String(m.last_date);
+      }
+      byPeriod.set(period.period_id, cur);
+    }
+  }
+  return [...byPeriod.values()];
+}
+
+export function aggregateSlice(buckets: any[], filter: SliceFilter): SliceSummary {
   let sum = 0;
   let count = 0;
   let spent = 0;
@@ -145,30 +126,33 @@ export function aggregateSlice(groups: ReportGroupLike[], filter: SliceFilter):
   const txns: any[] = [];
   const seen = new Set<string>();
 
-  for (const group of groups) {
-    if (!groupMatches(group, filter)) continue;
-    const m = group.metrics ?? {};
-    if (typeof m.sum === "number") sum += m.sum;
-    if (typeof m.count === "number") count += m.count;
-    if (typeof m.min === "number") min = min === null ? m.min : Math.min(min, m.min);
-    if (typeof m.max === "number") max = max === null ? m.max : Math.max(max, m.max);
-    if (m.first_date && (!firstDate || dateVal(String(m.first_date)) < dateVal(firstDate))) {
-      firstDate = String(m.first_date);
-    }
-    if (m.last_date && (!lastDate || dateVal(String(m.last_date)) > dateVal(lastDate))) {
-      lastDate = String(m.last_date);
-    }
-    for (const txn of group.txns ?? []) {
-      if (txn?.id != null) {
-        if (seen.has(txn.id)) continue;
-        seen.add(txn.id);
+  for (const bucket of buckets ?? []) {
+    if (!bucketMatches(bucket, filter)) continue;
+    for (const period of bucket.series?.[filter.granularity] ?? []) {
+      if (filter.periods?.length && !filter.periods.includes(period.period_id)) continue;
+      const m = period.metrics ?? {};
+      if (typeof m.sum === "number") sum += m.sum;
+      if (typeof m.count === "number") count += m.count;
+      if (typeof m.min === "number") min = min === null ? m.min : Math.min(min, m.min);
+      if (typeof m.max === "number") max = max === null ? m.max : Math.max(max, m.max);
+      if (m.first_date && (!firstDate || dateVal(String(m.first_date)) < dateVal(firstDate))) {
+        firstDate = String(m.first_date);
+      }
+      if (m.last_date && (!lastDate || dateVal(String(m.last_date)) > dateVal(lastDate))) {
+        lastDate = String(m.last_date);
+      }
+      for (const txn of period.txns ?? []) {
+        if (txn?.id != null) {
+          if (seen.has(txn.id)) continue;
+          seen.add(txn.id);
+        }
+        txns.push(txn);
+        const amt = Number(txn?.amount ?? 0);
+        if (amt < 0) spent += Math.abs(amt);
+        else income += amt;
+        const c = txn?.account?.currency;
+        if (c) currency = c;
       }
-      txns.push(txn);
-      const amt = Number(txn?.amount ?? 0);
-      if (amt < 0) spent += Math.abs(amt);
-      else income += amt;
-      const c = txn?.account?.currency;
-      if (c) currency = c;
     }
   }
 
@@ -179,12 +163,8 @@ export function buildReportFieldConfigs(resources: ResourceConfig[]): ReportFiel
   const reportsRes = resources.find((r) => r.name === "reports");
   if (!reportsRes) return null;
   const find = (name: string) => reportsRes.fields.find((f) => f.name === name);
-  const groupLabel = find("group_label");
-  const granularity = find("granularity");
-  const periodLabel = find("period_label");
-  const payee = find("payee");
-  const entityCount = find("entity_count");
+  const name = find("name");
   const generatedAt = find("generated_at");
-  if (!groupLabel || !granularity || !periodLabel || !payee || !entityCount || !generatedAt) return null;
-  return { groupLabel, granularity, periodLabel, payee, entityCount, generatedAt };
+  if (!name || !generatedAt) return null;
+  return { name, generatedAt };
 }