search: index business entities + dataset quick-filters

Build dedicated de-duplicated entity indices (atc-customers ~39k,
atc-employees ~39k, atc-products) from Trino so users can search by
customer/employee name, id and email directly instead of scanning raw
transaction rows. Raise per-table sample caps for the big source tables
(sales_orders, employee_events, supplychain events, device_metrics) and
all iceberg/Hadoop tables for broader row-level coverage.

UI: add Datasets quick-filter chips (Customers, Employees, Products,
Sales orders, HR events, Supply chain, Telemetry, Lakehouse) and default
the Search tab to business data instead of an infra-looking empty view.

ui/src/components/features/SearchView.tsx

@@ -126,7 +126,7 @@ export function SearchView() {
   useEffect(() => { load(); loadSourceAgg() }, [load, loadSourceAgg])
   useEffect(() => { loadIndices() }, [loadIndices])
 
-  const runSearch = useCallback(async (resetFrom = true) => {
+  const runSearch = useCallback(async (resetFrom = true, indicesOverride?: string[]) => {
     setSearching(true)
     setSearchError(null)
     const nextFrom = resetFrom ? 0 : from
@@ -137,7 +137,7 @@ export function SearchView() {
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({
           q,
-          indices: [...selected],
+          indices: indicesOverride ?? [...selected],
           filters,
           from: nextFrom,
           size,
@@ -166,6 +166,22 @@ export function SearchView() {
     setFilters((f) => (f.some((x) => x.field === field && x.value === value) ? f : [...f, { field, value }]))
   }
 
+  const applyPreset = (test: ((n: string) => boolean) | null) => {
+    const names = test ? indices.map((i) => i.name).filter(test) : []
+    setSelected(new Set(names))
+    runSearch(true, names)
+  }
+
+  // show business data immediately instead of an empty/infra-looking view
+  const didInit = useRef(false)
+  useEffect(() => {
+    if (didInit.current || indices.length === 0) return
+    didInit.current = true
+    const cust = indices.find((i) => i.name === 'atc-customers')
+    if (cust) applyPreset((n) => n === 'atc-customers')
+    /* eslint-disable-next-line */
+  }, [indices])
+
   const toggleIndex = (name: string) => {
     setSelected((s) => {
       const n = new Set(s)
@@ -328,6 +344,36 @@ export function SearchView() {
         </div>
       </div>
 
+      {/* dataset quick filters */}
+      <div className="flex shrink-0 flex-wrap items-center gap-1.5 border-b border-border px-3 pt-3 text-[10px]">
+        <span className="mr-1 font-semibold uppercase tracking-wider text-foreground-faint">Datasets</span>
+        {[
+          { label: 'All data', test: null as ((n: string) => boolean) | null },
+          { label: 'Customers', test: (n: string) => n === 'atc-customers' },
+          { label: 'Employees', test: (n: string) => n === 'atc-employees' },
+          { label: 'Products', test: (n: string) => n === 'atc-products' },
+          { label: 'Sales orders', test: (n: string) => n.includes('sales-orders') && !n.includes('masked') },
+          { label: 'HR events', test: (n: string) => n.includes('employee-events') },
+          { label: 'Supply chain', test: (n: string) => n.includes('supplychain') },
+          { label: 'Telemetry', test: (n: string) => n.includes('device-metrics') },
+          { label: 'Lakehouse (Hadoop)', test: (n: string) => n.startsWith('atc-iceberg') },
+        ].map((p) => {
+          const names = p.test ? indices.map((i) => i.name).filter(p.test) : []
+          const active = p.test ? names.length > 0 && names.every((n) => selected.has(n)) && selected.size === names.length : selected.size === 0
+          if (p.test && names.length === 0) return null
+          return (
+            <button
+              key={p.label}
+              type="button"
+              onClick={() => applyPreset(p.test)}
+              className={cn('rounded-full border px-2.5 py-1 font-medium transition-colors', active ? 'border-docker bg-docker/15 text-docker' : 'border-border text-foreground-muted hover:bg-surface-overlay')}
+            >
+              {p.label}
+            </button>
+          )
+        })}
+      </div>
+
       {/* search bar */}
       <div className="shrink-0 space-y-2 border-b border-border p-3">
         <div className="flex flex-wrap gap-2">