feat(go): M6.2 — adults page (table, filters, credits/debts/unmatched, Pay buttons)

- Extract AssembleAdults(ctx) from ServeAdults so HTML and JSON API share one reconcile path.
- HTMLHandler gains *api.Handler; ServeAdults loads real data and renders adults.tmpl.
- AdultsPageData view model + qrHref/qrHrefAll funcMap (URL-encode /qr params, YYYY-MM→MM/YYYY).
- adults.tmpl: full reconcile table, per-cell status classes + cell-unpaid-current, Pay button hrefs,
  totals row, credits/debts/unmatched sections, filter controls, sheet links.
- static/js/filters.js: NFD-normalize name filter + month-range column hiding; future months hidden by default.
- TestAdultsPage asserts member name and cell text against fixture data.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## 2026-05-08 01:09 CEST — feat(go): M6.2 — adults page (table, filters, Pay buttons)
+
+- `go/internal/web/api/handler.go`: extracted `ServeAdults` body into `AssembleAdults(ctx)` — shared by the JSON API route and the new HTML handler.
+- `go/internal/web/render.go`: added `AdultsPageData` view model (`PageData` + `api.AdultsResponse` + `Error`); `tmplFuncs` with `qrHref` / `qrHrefAll` (URL-encode QR Platba params, convert YYYY-MM → MM/YYYY).
+- `go/internal/web/html_handler.go`: `HTMLHandler` gains `*api.Handler`; `ServeAdults` loads real reconcile data and renders the full adults page.
+- `go/internal/web/templates/adults.tmpl`: full table (per-member rows, per-cell status classes, `data-month-idx`, Pay button hrefs to `/qr`), totals row, credits/debts/unmatched sections, filter controls, sheet links.
+- `go/internal/web/static/js/filters.js`: name filter (NFD-normalize) + month-range hide/show by `data-month-idx`; future months hidden by default.
+
 ## 2026-05-08 00:44 CEST — feat(go): M6.1 — template skeleton + embed.FS
 
 - `go/internal/web/templates/`: `base.tmpl` (full HTML layout), `partials/nav.tmpl` (three-tier nav with active-link highlighting), `partials/footer.tmpl` (build meta), and stub pages for each route (adults/juniors/payments/sync/flush_cache).

docs/plans/2026-05-03-2349-go-backend-rewrite-progress.md

@@ -4,7 +4,7 @@ Companion to [2026-05-03-2349-go-backend-rewrite.md](2026-05-03-2349-go-backend-
 
 **Current milestone:** M6 — Go-native HTML frontend
 **Started:** 2026-05-04
-**Last updated:** 2026-05-08 (M6.1)
+**Last updated:** 2026-05-08 (M6.2)
 
 ## How to use
 
@@ -110,8 +110,8 @@ Goal: byte-equal JSON between Python and Go for every route. This is the parity
 
 Goal: feature-equivalent UX on the Go side, designed cleanly. Not a Jinja port.
 
-- [x] **M6.1** Template skeleton: base layout, nav (Adults/Juniors/Payments/Sync/Flush), terminal-green-on-black theme; `embed.FS` for `templates/` + `static/`
-- [ ] **M6.2** `/adults` page: table, name filter input, month range filter, totals row, credits/debts/unmatched sections, Pay buttons that link to `/qr`
+- [x] **M6.1** Template skeleton: base layout, nav (Adults/Juniors/Payments/Sync/Flush), terminal-green-on-black theme; `embed.FS` for `templates/` + `static/` — `78e5059`
+- [x] **M6.2** `/adults` page: table, name filter input, month range filter, totals row, credits/debts/unmatched sections, Pay buttons that link to `/qr`
 - [ ] **M6.3** `/juniors` page: same structure + per-month J/A attendance breakdown + `"?"` sentinel rendering
 - [ ] **M6.4** `/payments` page: grouped-by-person ledger view
 - [ ] **M6.5** Modal JS module (`static/js/member-detail.js`): fetches `/api/adults` (or juniors), renders status/exceptions/transactions on row click; keyboard nav (Esc, ↑/↓)

docs/plans/2026-05-08-0052-go-rewrite-m6-2-adults-page.md

@@ -0,0 +1,131 @@
+# Plan: Go rewrite — M6.2 Adults page
+
+## Context
+
+M6.1 landed the template skeleton, embed.FS, and HTML routes ([progress §M6.1](2026-05-03-2349-go-backend-rewrite-progress.md#L113), commit `78e5059`). Every page renders chrome + a "Coming in M6.X" placeholder body. **M6.2 fills in `/adults`** — the most data-rich page and the template that drives the rest of the M6 work (juniors mostly mirrors it).
+
+Acceptance criteria, verbatim from [progress §M6.2](2026-05-03-2349-go-backend-rewrite-progress.md#L114):
+
+> `/adults` page: table, name filter input, month range filter, totals row, credits/debts/unmatched sections, Pay buttons that link to `/qr`
+
+The Go side has done excellent prep: `buildAdultsResponse` in [go/internal/web/api/build_adults.go](../../go/internal/web/api/build_adults.go) already produces the full view model (currently consumed only by `/api/adults`), the wire types in [go/internal/web/api/types.go](../../go/internal/web/api/types.go) match the Python view-model 1:1, and the CSS is already lifted into [go/internal/web/static/css/app.css](../../go/internal/web/static/css/app.css). M6.2 is therefore mostly **template authoring + handler wiring + a small filters script**, not a fresh port.
+
+## Current Go web state (what we're building on)
+
+- [go/internal/web/server.go:49](../../go/internal/web/server.go#L49) — `mux.HandleFunc("GET /adults", hh.ServeAdults)` already wired.
+- [go/internal/web/html_handler.go:16-18](../../go/internal/web/html_handler.go#L16-L18) — placeholder handler renders a `PageData{Active, Build}` shell only. Needs to gain access to the data layer.
+- [go/internal/web/render.go:11](../../go/internal/web/render.go#L11) — `PageData` struct is currently `{Active, Build}` only. Needs to extend or be wrapped by a typed adults view model.
+- [go/internal/web/api/handler.go:36-45](../../go/internal/web/api/handler.go#L36-L45) — `ServeAdults` already does `loadAll` → `Reconcile` → `buildAdultsResponse`. We will extract that body into an exported method so the HTML handler can reuse it without duplication.
+- [go/internal/web/api/build_adults.go:17](../../go/internal/web/api/build_adults.go#L17) — `buildAdultsResponse(...) AdultsResponse` returns everything the template needs (`Months`, `Results`, `Totals`, `Credits`, `Debts`, `Unmatched`, `BankAccount`, `CurrentMonth`, …). We pass this struct straight into the template.
+- [go/internal/web/templates/adults.tmpl](../../go/internal/web/templates/adults.tmpl) — currently a 5-line placeholder. Replace contents.
+- [go/internal/web/static/css/app.css](../../go/internal/web/static/css/app.css) — all selectors needed (`.cell-ok`, `.cell-unpaid`, `.cell-unpaid-current`, `.cell-overridden`, `.unmatched-row`, `.filter-container`, `.pay-btn`, `.member-row`, …) already present from M6.1.
+
+Reference for parity: [templates/adults.html](../../templates/adults.html) (Python source). Sections to mirror in markup terms:
+- Reconcile table — [adults.html:534-585](../../templates/adults.html#L534-L585)
+- Totals row — [adults.html:571-582](../../templates/adults.html#L571-L582)
+- Credits / Debts — [adults.html:587-609](../../templates/adults.html#L587-L609)
+- Unmatched — [adults.html:611-629](../../templates/adults.html#L611-L629)
+- Filter controls — [adults.html:515-532](../../templates/adults.html#L515-L532)
+- Filter JS (name + month range) — [adults.html:1019-1051](../../templates/adults.html#L1019-L1051)
+
+The member-detail modal, Pay-preview modal, and JSON-hydrated `memberData`/`rawPaymentsByPerson` globals are explicitly **out of scope for M6.2** — they belong to M6.5 (modal JS).
+
+## Approach
+
+1. **Share data assembly between HTML and JSON** — extract `ServeAdults`'s body into `(*api.Handler).AssembleAdults(ctx) (AdultsResponse, error)` and have `ServeAdults` call it. The HTML handler then calls the same method, keeping `/adults` and `/api/adults` byte-identical in semantics (same loaded data, same reconcile, same view model).
+2. **Wire HTMLHandler to data** — extend `HTMLHandler` with an `apiHandler *api.Handler` field and pass it from `Run()`. `ServeAdults` becomes: `AssembleAdults` → on error render an error body (or 500) → render `adults.tmpl` with a typed view model wrapping `PageData` + `api.AdultsResponse`.
+3. **Per-page typed view model** — add `AdultsPageData{ PageData; Data api.AdultsResponse }` in [render.go](../../go/internal/web/render.go) (or a new `view.go`). Template references `.Active`, `.Build` (chrome) and `.Data.Results`, `.Data.Totals`, `.Data.Months`, etc. Keeps the chrome contract for nav/footer untouched.
+4. **Author `adults.tmpl`** — port markup from [templates/adults.html:489-629](../../templates/adults.html#L489-L629). Notable mechanics:
+   - Filter controls block with `<input id="nameFilter">`, `<select id="fromMonth">`, `<select id="toMonth">`, `Apply` / `All` buttons. Month dropdown options rendered server-side from `.Data.Months` (no client-side hydration needed for filters).
+   - Reconcile table iterates `.Data.Results`; each row's months iterate `row.Months`. Cell `<td>` gets class `cell-{{.Status}}`, plus `cell-unpaid-current` when `.RawMonth >= .Data.CurrentMonth`, plus `cell-overridden` when `.Overridden`. Cells carry `data-month-idx="{{$i}}"` so the filter script can hide columns.
+   - Per-cell Pay button visible on hover when `(unpaid|partial)` and `RawMonth < CurrentMonth` — `<a class="pay-btn" href="/qr?...">Pay</a>` with the QR query string built server-side via a template helper (see Key design notes).
+   - Per-row "Pay All" button when `.PayableAmount > 0`, same href construction using `.UnpaidPeriods` for display and `.RawUnpaidPeriods` for the QR message.
+   - Totals `<tr>` iterates `.Data.Totals`, classes `total-cell-{{.Status}}`.
+   - Credits / Debts / Unmatched sections rendered conditionally on non-empty slices.
+5. **Tiny filter script** — new [go/internal/web/static/js/filters.js](../../go/internal/web/static/js/filters.js):
+   - `nameFilter` `input` event: NFD-normalize + lowercase + substring match against `.member-row [data-name]` (or row's first cell text); toggle `display:none` on non-matches.
+   - `fromMonth` / `toMonth` `change` event + `Apply` button: read selected `data-month-idx` range, toggle `month-hidden` class on `[data-month-idx]` `<th>`/`<td>` outside the range.
+   - `All` button: clear filters, restore all rows/cells.
+   - Match Python's behaviour byte-for-byte from [adults.html:864-1051](../../templates/adults.html#L864-L1051) but trimmed of modal/`memberData` calls.
+   - Loaded via `<script src="/static/js/filters.js" defer></script>` from the adults template (or base, if juniors will reuse it — yes, it should be in base or a content-block include).
+6. **`<a href="/qr?…">` Pay buttons now, modal in M6.5** — the M6.6 milestone adds `/qr`. Until then, hrefs return 404. M6.5 will layer modal preview behaviour on top by wrapping clicks; the markup stays the same. This is the simplest staged rollout.
+7. **Template helper for QR href** — add a `funcMap` to `Renderer` with `qrHref(account, amount, name, month string) string` (and a periods-list variant) that builds `/qr?account=…&amount=…&message=…` with proper URL encoding. Implementation: `net/url.Values{}.Encode()`. This keeps URL-construction logic out of the template syntax (`html/template` URL escaping isn't enough — query-param building deserves a Go helper).
+8. **Active-link key** — `Active: "adults"` already set; nav highlighting works as-is (verified in M6.1 smoke test).
+
+## Files to create / modify
+
+```
+go/internal/web/
+├── api/
+│   └── handler.go                MODIFY — extract ServeAdults body to AssembleAdults(ctx)
+├── html_handler.go               MODIFY — hold *api.Handler; ServeAdults loads + renders
+├── render.go                     MODIFY — add AdultsPageData type; add funcMap with qrHref()
+├── server.go                     MODIFY — pass *api.Handler into NewHTMLHandler
+├── html_handler_test.go          MODIFY — add adults markup-level assertions w/ stub Sources
+├── templates/
+│   └── adults.tmpl               MODIFY — replace placeholder w/ full table + filters + sections
+└── static/
+    └── js/
+        └── filters.js            NEW — name + month-range client-side filtering
+```
+
+No new packages; no domain or wire-type changes.
+
+## Key design notes
+
+- **Reuse `buildAdultsResponse` verbatim** — no parallel "view model" needed. `AdultsResponse` already has every field the template wants. `/adults` and `/api/adults` consume the same struct.
+- **Extracting `AssembleAdults`** preserves the parity contract: anything that changes the JSON also changes the HTML, by construction. (It also sets up the same pattern for M6.3 juniors and M6.4 payments.)
+- **Filter UX is DOM-driven**, no JSON hydration. `member_data` / `raw_payments` JSON payloads stay deferred to M6.5 (modal needs them; filters do not).
+- **`current_month` boundary is server-side** — `AdultsResponse.CurrentMonth` (set from `time.Now().Format("2006-01")` in `loadAll`) is what the template compares `RawMonth` against for `cell-unpaid-current` styling and Pay-button visibility. Same value Python passes through `vm["current_month"]`.
+- **`html/template` autoescaping is sufficient** for member names, sender, message, etc. — but Pay-button URLs need explicit `url.Values` encoding (Czech names have diacritics and spaces). Hence the `qrHref` funcMap helper.
+- **Error rendering**: if `AssembleAdults` fails, render the base shell with an error banner inside `content` rather than `http.Error`. Keeps nav visible so the user can navigate away. Match Python's `"No data."` fallback at [app.py:233](../../app.py#L233) for empty results.
+- **No JS framework, no bundler** — filter script is plain ES2020, ~80 lines, inline-readable. Matches M6.1's "no JS in M6.1" follow-through (we add JS in M6.2, but kept minimal).
+- **NFD-normalize** in JS via `s.normalize('NFD').replace(/\p{Diacritic}/gu, '').toLowerCase()` to match Python's `unicodedata.normalize('NFD', ...)`. Python ref: [adults.html:868-873](../../templates/adults.html#L868-L873).
+- **Filter persistence is out of scope** — Python's filters are session-only (no localStorage). Same here.
+
+## Critical files to read
+
+- [go/internal/web/api/build_adults.go](../../go/internal/web/api/build_adults.go) — full view model already built; the template just iterates over `AdultsResponse`.
+- [go/internal/web/api/types.go:91-122](../../go/internal/web/api/types.go#L91-L122) — `MonthCell`, `TotalCell`, `MemberRow`, `Credit` shapes.
+- [go/internal/web/api/handler.go:36-96](../../go/internal/web/api/handler.go#L36-L96) — pattern for `loadAll` + `Reconcile` + `buildAdultsResponse`; the bit to refactor into `AssembleAdults`.
+- [go/internal/web/static/css/app.css](../../go/internal/web/static/css/app.css) — class names available; no edits needed.
+- [templates/adults.html:489-629](../../templates/adults.html#L489-L629) — markup reference for filter controls, table, totals, credits/debts, unmatched.
+- [templates/adults.html:864-1051](../../templates/adults.html#L864-L1051) — JS reference for filter behaviour (NFD-normalize, month range hiding, Apply/All).
+- [tests/test_app.py:50-75](../../tests/test_app.py#L50-L75) — `test_adults_route` in Python, mirror its assertions in Go: status 200, body contains member name + `750/750 CZK (4)` + `Adults Dashboard`, does not contain `OK`.
+
+## Verification
+
+End-to-end smoke after `make go-build`:
+
+1. `make web-go &` — server boots, no template-parse errors.
+2. `curl -i localhost:8080/adults` → `200`, `Content-Type: text/html`.
+3. Browser at `http://localhost:8080/adults` against real data:
+   - Table renders with one row per adult member, one column per month, totals row at bottom.
+   - Cell colors match `/api/adults` JSON — pick a `Credits` member from JSON, confirm green-ish status; pick a `Debts` member, confirm red-ish.
+   - Credits / Debts / Unmatched sections render with content matching the JSON arrays for those keys.
+   - Per-cell `Pay` buttons appear on hover for past-month unpaid/partial cells; href contains `/qr?account=...&amount=...&message=`.
+   - Per-row "Pay All" button shows for members with `payable_amount > 0`.
+4. Filters:
+   - Type a partial member name in `#nameFilter` → only matching rows visible. Test with diacritics (e.g. `nemec` matches `Němec`).
+   - Pick `fromMonth=2026-02`, `toMonth=2026-04`, click `Apply` → only those columns visible (table + totals row).
+   - Click `All` → everything restored.
+5. `curl -s localhost:8080/adults | grep -F 'Adults Dashboard'` matches; `grep -F 'Coming in M6.2'` does **not** match.
+6. `make go-test` — `html_handler_test.go` adults assertions pass with stub Sources fixture (replicating `test_adults_route` from Python).
+7. `make go-lint` clean.
+8. `make parity` still green — `/api/adults` JSON unchanged because `AssembleAdults` extraction is a pure refactor.
+9. CHANGELOG entry per CLAUDE.md (timestamp via `date "+%Y-%m-%d %H:%M %Z"`).
+10. Tick M6.2 in [progress tracker §M6.2](2026-05-03-2349-go-backend-rewrite-progress.md#L114) with the merge commit SHA.
+
+## Branch & MR
+
+Branch `feat/go-m6-2-adults-page` per CLAUDE.md branch-per-feature workflow. Commit, push with `-u`, then:
+
+```bash
+tea pr create \
+  --title "feat(go): M6.2 — adults page (table, filters, credits/debts/unmatched, Pay buttons)" \
+  --description "..." \
+  --base main \
+  --head feat/go-m6-2-adults-page
+```
+
+Print the PR URL for the user. User merges in Gitea browser.

go/internal/web/api/handler.go

@@ -34,14 +34,23 @@ func (h *Handler) ServeVersion(w http.ResponseWriter, r *http.Request) {
 
 // ServeAdults handles GET /api/adults.
 func (h *Handler) ServeAdults(w http.ResponseWriter, r *http.Request) {
-	ctx := r.Context()
-	members, sortedMonths, txns, exceptions, err := h.loadAll(ctx, true)
+	resp, err := h.AssembleAdults(r.Context())
 	if err != nil {
 		h.writeError(w, r, err)
 		return
 	}
+	writeJSON(w, resp)
+}
+
+// AssembleAdults loads all data and builds the adults view model.
+// Shared between the JSON API route and the HTML handler.
+func (h *Handler) AssembleAdults(ctx context.Context) (AdultsResponse, error) {
+	members, sortedMonths, txns, exceptions, err := h.loadAll(ctx, true)
+	if err != nil {
+		return AdultsResponse{}, err
+	}
 	result := domreconcile.Reconcile(members, sortedMonths, txns, exceptions, time.Now().Year())
-	writeJSON(w, buildAdultsResponse(members, sortedMonths, result, txns, h.Config, time.Now().Format("2006-01")))
+	return buildAdultsResponse(members, sortedMonths, result, txns, h.Config, time.Now().Format("2006-01")), nil
 }
 
 // ServeJuniors handles GET /api/juniors.

go/internal/web/html_handler.go

@@ -1,20 +1,35 @@
 package web
 
-import "net/http"
+import (
+	"fuj-management/go/internal/web/api"
+	"net/http"
+)
 
 // HTMLHandler serves the Go-native HTML frontend.
 type HTMLHandler struct {
 	renderer   *Renderer
 	build      BuildInfo
+	apiHandler *api.Handler
 }
 
 // NewHTMLHandler constructs an HTMLHandler.
-func NewHTMLHandler(r *Renderer, b BuildInfo) *HTMLHandler {
-	return &HTMLHandler{renderer: r, build: b}
+func NewHTMLHandler(r *Renderer, b BuildInfo, ah *api.Handler) *HTMLHandler {
+	return &HTMLHandler{renderer: r, build: b, apiHandler: ah}
 }
 
 func (h *HTMLHandler) ServeAdults(w http.ResponseWriter, r *http.Request) {
-	h.renderer.Render(w, "adults", PageData{Active: "adults", Build: h.build})
+	data, err := h.apiHandler.AssembleAdults(r.Context())
+	if err != nil {
+		h.renderer.Render(w, "adults", AdultsPageData{
+			PageData: PageData{Active: "adults", Build: h.build},
+			Error:    err.Error(),
+		})
+		return
+	}
+	h.renderer.Render(w, "adults", AdultsPageData{
+		PageData: PageData{Active: "adults", Build: h.build},
+		Data:     data,
+	})
 }
 
 func (h *HTMLHandler) ServeJuniors(w http.ResponseWriter, r *http.Request) {

go/internal/web/html_handler_test.go

@@ -1,21 +1,61 @@
 package web_test
 
 import (
+	"context"
 	"fmt"
+	"fuj-management/go/internal/config"
+	"fuj-management/go/internal/domain/reconcile"
 	"fuj-management/go/internal/web"
+	"fuj-management/go/internal/web/api"
 	"net/http"
 	"net/http/httptest"
 	"strings"
 	"testing"
 )
 
+// fixtureSources returns one adult ("Test Member", tier A) with a 2026-01 fee
+// of 750 CZK (4 sessions) and a matching payment of 750 — mirrors Python's
+// test_adults_route fixture.
+type fixtureSources struct{}
+
+func (fixtureSources) LoadAdults(_ context.Context) ([]reconcile.Member, []string, error) {
+	return []reconcile.Member{
+		{Name: "Test Member", Tier: "A", Fees: map[string]reconcile.FeeData{
+			"2026-01": {Expected: 750, Attendance: 4},
+		}},
+	}, []string{"2026-01"}, nil
+}
+
+func (fixtureSources) LoadJuniors(_ context.Context) ([]reconcile.Member, []string, error) {
+	return nil, nil, nil
+}
+
+func (fixtureSources) LoadTransactions(_ context.Context) ([]reconcile.Transaction, error) {
+	amt := float64(750)
+	return []reconcile.Transaction{
+		{Date: "2026-01-01", Amount: 750, Person: "Test Member", Purpose: "2026-01", InferredAmount: &amt},
+	}, nil
+}
+
+func (fixtureSources) LoadExceptions(_ context.Context) (map[reconcile.ExceptionKey]reconcile.Exception, error) {
+	return nil, nil
+}
+
+func fixtureHandler(t *testing.T) *api.Handler {
+	t.Helper()
+	return &api.Handler{
+		Sources: fixtureSources{},
+		Config:  config.Config{BankAccount: "CZ0000000000000000000000"},
+	}
+}
+
 func TestHTMLHandlerSmoke(t *testing.T) {
 	renderer, err := web.NewRenderer()
 	if err != nil {
 		t.Fatalf("NewRenderer: %v", err)
 	}
 	b := web.BuildInfo{Version: "v0", Commit: "abc1234", BuildDate: "2026-01-01"}
-	h := web.NewHTMLHandler(renderer, b)
+	h := web.NewHTMLHandler(renderer, b, fixtureHandler(t))
 
 	cases := []struct {
 		path    string
@@ -52,3 +92,37 @@ func TestHTMLHandlerSmoke(t *testing.T) {
 		})
 	}
 }
+
+func TestAdultsPage(t *testing.T) {
+	renderer, err := web.NewRenderer()
+	if err != nil {
+		t.Fatalf("NewRenderer: %v", err)
+	}
+	b := web.BuildInfo{Version: "v0", Commit: "abc1234", BuildDate: "2026-01-01"}
+	h := web.NewHTMLHandler(renderer, b, fixtureHandler(t))
+
+	req := httptest.NewRequest(http.MethodGet, "/adults", nil)
+	w := httptest.NewRecorder()
+	h.ServeAdults(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("status = %d, want 200", w.Code)
+	}
+
+	body := w.Body.String()
+
+	for _, want := range []string{
+		"Adults Dashboard",
+		"Test Member",
+		"750/750 CZK (4)", // paid/expected (attendance)
+	} {
+		if !strings.Contains(body, want) {
+			t.Errorf("body missing %q", want)
+		}
+	}
+
+	// Python assertion: cell text never says literally "OK"
+	if strings.Contains(body, ">OK<") {
+		t.Error("body should not contain >OK<")
+	}
+}

go/internal/web/render.go

@@ -2,9 +2,12 @@ package web
 
 import (
 	"fmt"
+	"fuj-management/go/internal/web/api"
 	"html/template"
 	"log/slog"
 	"net/http"
+	"net/url"
+	"strconv"
 )
 
 // PageData is the view model passed to every HTML template.
@@ -13,6 +16,13 @@ type PageData struct {
 	Build  BuildInfo
 }
 
+// AdultsPageData is the view model for the /adults HTML page.
+type AdultsPageData struct {
+	PageData
+	Data  api.AdultsResponse
+	Error string
+}
+
 // Renderer parses and executes HTML templates from the embedded FS.
 type Renderer struct {
 	tmpls map[string]*template.Template
@@ -20,12 +30,43 @@ type Renderer struct {
 
 var pageNames = []string{"adults", "juniors", "payments", "sync", "flush_cache"}
 
+// qrHref builds the /qr query URL for a single-month Pay button.
+// rawMonth is "YYYY-MM"; it is converted to "MM/YYYY" in the QR message.
+func qrHref(account string, amount int, name, rawMonth string) string {
+	// Convert "YYYY-MM" → "MM/YYYY" to match Python's showPayQR JS.
+	if len(rawMonth) == 7 && rawMonth[4] == '-' {
+		rawMonth = rawMonth[5:] + "/" + rawMonth[:4]
+	}
+	msg := name + ": " + rawMonth
+	return "/qr?" + url.Values{
+		"account": {account},
+		"amount":  {strconv.Itoa(amount)},
+		"message": {msg},
+	}.Encode()
+}
+
+// qrHrefAll builds the /qr query URL for a Pay-All button.
+// rawPeriods is the "+" -joined MM/YYYY string from MemberRow.RawUnpaidPeriods.
+func qrHrefAll(account string, amount int, name, rawPeriods string) string {
+	msg := name + ": " + rawPeriods
+	return "/qr?" + url.Values{
+		"account": {account},
+		"amount":  {strconv.Itoa(amount)},
+		"message": {msg},
+	}.Encode()
+}
+
+var tmplFuncs = template.FuncMap{
+	"qrHref":    qrHref,
+	"qrHrefAll": qrHrefAll,
+}
+
 // NewRenderer parses all templates from the embedded FS.
 // A parse failure should be treated as a startup-time fatal error.
 func NewRenderer() (*Renderer, error) {
 	tmpls := make(map[string]*template.Template, len(pageNames))
 	for _, name := range pageNames {
-		t, err := template.New("").ParseFS(templateFS,
+		t, err := template.New("").Funcs(tmplFuncs).ParseFS(templateFS,
 			"templates/base.tmpl",
 			"templates/partials/nav.tmpl",
 			"templates/partials/footer.tmpl",

go/internal/web/server.go

@@ -33,7 +33,7 @@ func Run(logger *slog.Logger, addr string, build BuildInfo, sources membership.S
 		Config:       cfg,
 		Logger:       logger,
 	}
-	hh := NewHTMLHandler(renderer, build)
+	hh := NewHTMLHandler(renderer, build, ah)
 
 	staticSubFS, err := fs.Sub(staticFS, "static")
 	if err != nil {

go/internal/web/static/js/filters.js

@@ -0,0 +1,91 @@
+// Client-side filters for the Adults (and future Juniors) dashboard table.
+// Mirrors adults.html:864-1051 from the Python frontend.
+(function () {
+  'use strict';
+
+  // NFD-normalize + strip diacritics + lowercase, matching Python's
+  // unicodedata.normalize('NFD', s).encode('ascii', 'ignore').decode().lower()
+  function normalize(s) {
+    return s.normalize('NFD').replace(/\p{Diacritic}/gu, '').toLowerCase();
+  }
+
+  const container = document.getElementById('filterContainer');
+  if (!container) return;
+
+  const currentMonth = container.dataset.currentMonth || '';
+
+  const nameInput   = document.getElementById('nameFilter');
+  const fromSelect  = document.getElementById('fromMonth');
+  const toSelect    = document.getElementById('toMonth');
+  const applyBtn    = document.getElementById('applyFilter');
+  const clearBtn    = document.getElementById('clearFilter');
+
+  // ── Month column visibility ───────────────────────────────────────────────
+
+  // Hide columns whose raw month is in the future by default.
+  function hideFutureMonths() {
+    if (!currentMonth) return;
+    document.querySelectorAll('[data-raw-month]').forEach(el => {
+      if (el.dataset.rawMonth > currentMonth) {
+        el.classList.add('month-hidden');
+      }
+    });
+    // Sync toMonth select to the last non-hidden month.
+    const ths = [...document.querySelectorAll('thead th[data-month-idx]')];
+    const visibleIdxs = ths
+      .filter(th => !th.classList.contains('month-hidden'))
+      .map(th => parseInt(th.dataset.monthIdx, 10));
+    if (visibleIdxs.length) {
+      toSelect.value = String(visibleIdxs[visibleIdxs.length - 1]);
+    }
+  }
+
+  function applyMonthFilter() {
+    const from = fromSelect.value !== '' ? parseInt(fromSelect.value, 10) : -Infinity;
+    const to   = toSelect.value   !== '' ? parseInt(toSelect.value,   10) :  Infinity;
+
+    document.querySelectorAll('[data-month-idx]').forEach(el => {
+      const idx = parseInt(el.dataset.monthIdx, 10);
+      if (idx < from || idx > to) {
+        el.classList.add('month-hidden');
+      } else {
+        el.classList.remove('month-hidden');
+      }
+    });
+  }
+
+  function clearMonthFilter() {
+    document.querySelectorAll('[data-month-idx]').forEach(el => {
+      el.classList.remove('month-hidden');
+    });
+    fromSelect.value = '';
+    toSelect.value   = '';
+  }
+
+  // ── Name row visibility ───────────────────────────────────────────────────
+
+  function applyNameFilter() {
+    const query = normalize(nameInput.value.trim());
+    document.querySelectorAll('tr.member-row').forEach(row => {
+      const name = normalize(row.dataset.name || '');
+      row.style.display = (!query || name.includes(query)) ? '' : 'none';
+    });
+  }
+
+  // ── Event wiring ─────────────────────────────────────────────────────────
+
+  nameInput.addEventListener('input', applyNameFilter);
+
+  applyBtn.addEventListener('click', applyMonthFilter);
+
+  clearBtn.addEventListener('click', function () {
+    nameInput.value = '';
+    applyNameFilter();
+    clearMonthFilter();
+    hideFutureMonths();
+  });
+
+  // ── Initialise ────────────────────────────────────────────────────────────
+
+  hideFutureMonths();
+}());

go/internal/web/templates/adults.tmpl

@@ -1,5 +1,137 @@
 {{define "title"}}Adults{{end}}
 {{define "content"}}
 <h1>Adults Dashboard</h1>
-<p class="description">Coming in M6.2</p>
+
+{{if .Error}}
+<p class="description error-banner">Error loading data: {{.Error}}</p>
+{{else}}
+
+<div class="filter-container" id="filterContainer" data-current-month="{{.Data.CurrentMonth}}">
+  <div class="filter-item">
+    <label class="filter-label" for="nameFilter">Member</label>
+    <input id="nameFilter" class="filter-input" type="text" placeholder="Filter by name…">
+  </div>
+  <div class="filter-item">
+    <label class="filter-label" for="fromMonth">From</label>
+    <select id="fromMonth" class="filter-select">
+      <option value="">All</option>
+      {{range $i, $m := .Data.Months}}
+      <option value="{{$i}}">{{$m}}</option>
+      {{end}}
+    </select>
+  </div>
+  <div class="filter-item">
+    <label class="filter-label" for="toMonth">To</label>
+    <select id="toMonth" class="filter-select">
+      <option value="">All</option>
+      {{range $i, $m := .Data.Months}}
+      <option value="{{$i}}">{{$m}}</option>
+      {{end}}
+    </select>
+  </div>
+  <div class="filter-item">
+    <button id="applyFilter" class="filter-btn">Apply</button>
+    <button id="clearFilter" class="filter-btn">All</button>
+  </div>
+</div>
+
+{{if .Data.Results}}
+<div class="table-wrapper">
+<table class="reconcile-table">
+  <thead>
+    <tr>
+      <th>Member</th>
+      {{range $i, $m := .Data.Months}}
+      <th data-month-idx="{{$i}}" data-raw-month="{{index $.Data.RawMonths $i}}">{{$m}}</th>
+      {{end}}
+      <th>Balance</th>
+      <th></th>
+    </tr>
+  </thead>
+  <tbody>
+    {{range $row := .Data.Results}}
+    <tr class="member-row" data-name="{{$row.Name}}">
+      <td class="member-name">{{$row.Name}}</td>
+      {{range $i, $cell := $row.Months}}
+      <td class="cell cell-{{$cell.Status}}{{if and (or (eq $cell.Status "unpaid") (eq $cell.Status "partial")) (ge $cell.RawMonth $.Data.CurrentMonth)}} cell-unpaid-current{{end}}{{if $cell.Overridden}} cell-overridden{{end}}"
+          data-month-idx="{{$i}}" title="{{$cell.Tooltip}}">
+        {{$cell.Text}}
+        {{if and (or (eq $cell.Status "unpaid") (eq $cell.Status "partial")) (lt $cell.RawMonth $.Data.CurrentMonth)}}
+        <a class="pay-btn" href="{{qrHref $.Data.BankAccount $cell.Amount $row.Name $cell.RawMonth}}">Pay</a>
+        {{end}}
+      </td>
+      {{end}}
+      <td class="balance-cell{{if lt $row.Balance 0}} balance-negative{{end}}">{{$row.Balance}} CZK</td>
+      <td class="payall-cell">
+        {{if gt $row.PayableAmount 0}}
+        <a class="pay-btn pay-all-btn" href="{{qrHrefAll $.Data.BankAccount $row.PayableAmount $row.Name $row.RawUnpaidPeriods}}">Pay All</a>
+        {{end}}
+      </td>
+    </tr>
+    {{end}}
+    <tr class="totals-row">
+      <td><strong>TOTAL</strong></td>
+      {{range $i, $t := .Data.Totals}}
+      <td class="total-cell total-cell-{{$t.Status}}" data-month-idx="{{$i}}" data-raw-month="{{index $.Data.RawMonths $i}}">{{$t.Text}}</td>
+      {{end}}
+      <td colspan="2"></td>
+    </tr>
+  </tbody>
+</table>
+</div>
+{{else}}
+<p class="description">No members found.</p>
+{{end}}
+
+{{if .Data.Credits}}
+<h2 class="section-header">Credits</h2>
+<ul class="credits-list">
+  {{range .Data.Credits}}
+  <li>{{.Name}}: <strong>+{{.Amount}} CZK</strong></li>
+  {{end}}
+</ul>
+{{end}}
+
+{{if .Data.Debts}}
+<h2 class="section-header">Debts</h2>
+<ul class="debts-list">
+  {{range .Data.Debts}}
+  <li>{{.Name}}: <strong>−{{.Amount}} CZK</strong></li>
+  {{end}}
+</ul>
+{{end}}
+
+{{if .Data.Unmatched}}
+<h2 class="unmatched-header section-header">Unmatched Transactions</h2>
+<table class="unmatched-table">
+  <thead>
+    <tr>
+      <th>Date</th>
+      <th>Amount</th>
+      <th>Sender</th>
+      <th>Message</th>
+    </tr>
+  </thead>
+  <tbody>
+    {{range .Data.Unmatched}}
+    <tr class="unmatched-row">
+      <td>{{.Date}}</td>
+      <td>{{printf "%.0f" .Amount}} CZK</td>
+      <td>{{.Sender}}</td>
+      <td>{{.Message}}</td>
+    </tr>
+    {{end}}
+  </tbody>
+</table>
+{{end}}
+
+<p class="sheet-links">
+  <a href="{{.Data.AttendanceURL}}" target="_blank" rel="noopener">[Attendance sheet]</a>
+  &middot;
+  <a href="{{.Data.PaymentsURL}}" target="_blank" rel="noopener">[Payments sheet]</a>
+</p>
+
+{{end}}
+
+<script src="/static/js/filters.js" defer></script>
 {{end}}