chore: CHANGELOG and progress tracker for M5.2

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Changelog
 
+## 2026-05-07 20:13 CEST — feat(go): M5.2 — HTTP handlers for /api/adults, /api/juniors, /api/payments, /api/version
+
+- `web/api/handler.go`: `Handler` struct + `ServeAdults`, `ServeJuniors`, `ServePayments`, `ServeVersion` using `membership.Sources`.
+- `web/api/build_{adults,juniors,payments,common}.go`: ports of `scripts/views.py` view-model builders; `buildJuniorMemberRow` handles `"?"` sentinel, `:NJ,MA` breakdown, unknown-month skip.
+- Extended `reconcile.FeeData`/`MonthData` with `IsUnknown`, `JuniorAttendance`, `AdultAttendance`; `Transaction` with `ManualFix`, `VS`, `BankID`, `SyncID`.
+- `sources.go` exports `AdultMergedMonths`/`JuniorMergedMonths`; parses new FeeData and transaction columns.
+- `web/server.go` + `cmd/fuj/main.go` wired to register `/api/*` routes.
+- PR #17.
+
 ## 2026-05-07 17:37 CEST — feat(go): M5.1 — /api/* wire types + JSON Schemas
 
 - New `go/internal/web/api/` package: `AdultsResponse`, `JuniorsResponse`, `PaymentsResponse`, `VersionResponse` with explicit `json:` tags matching Python view-model keys.

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

@@ -98,7 +98,7 @@ Goal: every external IO (Sheets, Drive, Fio, file cache) accessed through a narr
 Goal: byte-equal JSON between Python and Go for every route. This is the parity contract.
 
 - [x] **M5.1** Hand-author Go structs for `/api/adults`, `/api/juniors`, `/api/payments`, `/api/version` with explicit `json:` tags matching Python keys; emit JSON Schemas via `github.com/invopop/jsonschema` to `tests/fixtures/api-schema/` — `f253e3f`
-- [ ] **M5.2** Implement Go handlers for `/api/*` routes composing `services/*` results into the JSON structs
+- [x] **M5.2** Implement Go handlers for `/api/*` routes composing `services/*` results into the JSON structs — `7d48e8f`
 - [ ] **M5.3** Add Python `/api/X` shadow endpoints in [app.py](app.py): `jsonify(view_model_dict)` — no transformation
 - [ ] **M5.4** Build `cmd/parity/main.go`: hits both backends' `/api/X`, normalizes allowlist (`render_time.total`, `build_meta`), prints `cmp.Diff`. Add `make parity` target
 

go/cmd/fuj/main.go

@@ -73,10 +73,18 @@ func serverCmd(args []string) {
 		cfg.ServerAddr = *addr
 	}
 
+	ctx := context.Background()
 	logger := logging.New(cfg.LogLevel)
+
+	sources, err := membership.NewSources(ctx, cfg)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "fuj server: init sources: %v\n", err)
+		os.Exit(1)
+	}
+
 	build := web.BuildInfo{Version: version, Commit: commit, BuildDate: buildDate}
 
-	if err := web.Run(logger, cfg.ServerAddr, build); err != nil {
+	if err := web.Run(logger, cfg.ServerAddr, build, sources, cfg); err != nil {
 		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}

go/internal/domain/reconcile/reconcile.go

@@ -20,10 +20,13 @@ type Exception struct {
 	Note   string
 }
 
-// FeeData holds the expected fee and attendance count for one member in one month.
+// FeeData holds the expected fee and attendance data for one member in one month.
 type FeeData struct {
-	Expected   int
+	Expected         int
-	Attendance int
+	IsUnknown        bool // true when junior has exactly 1 session (manual review; Python sentinel "?")
+	Attendance       int
+	JuniorAttendance int // junior-tab sessions; used for the :NJ,MA breakdown in the juniors view
+	AdultAttendance  int // adult-tab sessions for J-tier members; used for the :NJ,MA breakdown
 }
 
 // Member is one row from the attendance sheet.
@@ -39,11 +42,15 @@ type Member struct {
 type Transaction struct {
 	Date           string
 	Amount         float64
+	ManualFix      string   // "manual fix" column; non-empty disables re-inference
 	Person         string   // comma-separated canonical names (empty → use inference)
 	Purpose        string   // comma-separated "YYYY-MM" or "other:…" (empty → use inference)
 	InferredAmount *float64 // nil → fall back to Amount
 	Sender         string
+	VS             string // Variabilní symbol (Czech variable payment symbol)
 	Message        string
+	BankID         string
+	SyncID         string
 	UserID         string
 }
 
@@ -69,8 +76,11 @@ type OtherEntry struct {
 // MonthData is the ledger state for one member in one month.
 type MonthData struct {
 	Expected         int
+	IsUnknown        bool // mirrors FeeData.IsUnknown; not overridden by exceptions
 	OriginalExpected int
 	AttendanceCount  int
+	JuniorAttendance int // junior-tab sessions; for :NJ,MA breakdown in juniors view
+	AdultAttendance  int // adult-tab sessions; for :NJ,MA breakdown
 	Exception        *Exception
 	Paid             float64
 	Transactions     []TxEntry
@@ -173,8 +183,11 @@ func Reconcile(
 
 			ledger[name][m] = MonthData{
 				Expected:         expected,
+				IsUnknown:        fd.IsUnknown,
 				OriginalExpected: originalExpected,
 				AttendanceCount:  attendanceCount,
+				JuniorAttendance: fd.JuniorAttendance,
+				AdultAttendance:  fd.AdultAttendance,
 				Exception:        exInfo,
 				Paid:             0,
 				Transactions:     []TxEntry{},

go/internal/domain/reconcile/reconcile_test.go

@@ -29,7 +29,7 @@ func tx(person, purpose string, amount float64) Transaction {
 
 func TestReconcileExceptionOverride(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {750, 4}}}}
+	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 4}}}}
 	exceptions := map[ExceptionKey]Exception{
 		{Name: "alice", Period: "2026-01"}: {Amount: 400, Note: "Test exception"},
 	}
@@ -54,7 +54,7 @@ func TestReconcileExceptionOverride(t *testing.T) {
 
 func TestReconcileFallbackToAttendance(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {750, 4}}}}
+	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 4}}}}
 
 	result := Reconcile(members, []string{"2026-01"}, nil, nil, defaultYear)
 
@@ -68,9 +68,9 @@ func TestReconcileGreedyExactMatch(t *testing.T) {
 	members := []Member{{
 		Name: "Alice", Tier: "A",
 		Fees: map[string]FeeData{
-			"2026-02": {750, 3},
+			"2026-02": {Expected: 750, Attendance: 3},
-			"2026-03": {350, 3},
+			"2026-03": {Expected: 350, Attendance: 3},
-			"2026-04": {150, 2},
+			"2026-04": {Expected: 150, Attendance: 2},
 		},
 	}}
 	sortedMonths := []string{"2026-02", "2026-03", "2026-04"}
@@ -93,7 +93,7 @@ func TestReconcileGreedyOverpaymentGoesToCredit(t *testing.T) {
 	t.Parallel()
 	members := []Member{{
 		Name: "Alice", Tier: "A",
-		Fees: map[string]FeeData{"2026-01": {750, 3}, "2026-02": {750, 3}},
+		Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}, "2026-02": {Expected: 750, Attendance: 3}},
 	}}
 	sortedMonths := []string{"2026-01", "2026-02"}
 
@@ -115,7 +115,7 @@ func TestReconcileProportionalUnderpayment(t *testing.T) {
 	t.Parallel()
 	members := []Member{{
 		Name: "Alice", Tier: "A",
-		Fees: map[string]FeeData{"2026-02": {750, 3}, "2026-03": {350, 3}, "2026-04": {750, 3}},
+		Fees: map[string]FeeData{"2026-02": {Expected: 750, Attendance: 3}, "2026-03": {Expected: 350, Attendance: 3}, "2026-04": {Expected: 750, Attendance: 3}},
 	}}
 	sortedMonths := []string{"2026-02", "2026-03", "2026-04"}
 	amount := 1250.0
@@ -146,7 +146,7 @@ func TestReconcileProportionalUnderpayment(t *testing.T) {
 
 func TestReconcileSingleMonthUnchanged(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {750, 3}}}}
+	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}}}}
 
 	result := Reconcile(members, []string{"2026-01"}, []Transaction{tx("Alice", "2026-01", 750)}, nil, defaultYear)
 
@@ -158,8 +158,8 @@ func TestReconcileSingleMonthUnchanged(t *testing.T) {
 func TestReconcileTwoMembersMultiMonth(t *testing.T) {
 	t.Parallel()
 	members := []Member{
-		{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {750, 3}, "2026-02": {350, 3}}},
+		{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}, "2026-02": {Expected: 350, Attendance: 3}}},
-		{Name: "Bob", Tier: "A", Fees: map[string]FeeData{"2026-01": {750, 3}, "2026-02": {350, 3}}},
+		{Name: "Bob", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}, "2026-02": {Expected: 350, Attendance: 3}}},
 	}
 	sortedMonths := []string{"2026-01", "2026-02"}
 
@@ -180,7 +180,7 @@ func TestReconcileEvenSplitFallbackWhenNoExpected(t *testing.T) {
 	t.Parallel()
 	members := []Member{{
 		Name: "Alice", Tier: "A",
-		Fees: map[string]FeeData{"2026-01": {0, 0}, "2026-02": {0, 0}},
+		Fees: map[string]FeeData{"2026-01": {Expected: 0, Attendance: 0}, "2026-02": {Expected: 0, Attendance: 0}},
 	}}
 	sortedMonths := []string{"2026-01", "2026-02"}
 
@@ -197,7 +197,7 @@ func TestReconcileEvenSplitFallbackWhenNoExpected(t *testing.T) {
 
 func TestReconcileDiacriticsTolerantPersonMatching(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Mária Maco", Tier: "A", Fees: map[string]FeeData{"2026-04": {750, 4}}}}
+	members := []Member{{Name: "Mária Maco", Tier: "A", Fees: map[string]FeeData{"2026-04": {Expected: 750, Attendance: 4}}}}
 	txFn := func(person string) Transaction {
 		return Transaction{
 			Date: "2026-04-15", Amount: 750, Person: person, Purpose: "2026-04",
@@ -232,7 +232,7 @@ func TestReconcileDiacriticsTolerantPersonMatching(t *testing.T) {
 
 func TestReconcileTrulyUnknownPersonIsUnmatched(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Mária Maco", Tier: "A", Fees: map[string]FeeData{"2026-04": {750, 4}}}}
+	members := []Member{{Name: "Mária Maco", Tier: "A", Fees: map[string]FeeData{"2026-04": {Expected: 750, Attendance: 4}}}}
 	txs := []Transaction{{
 		Date: "2026-04-15", Amount: 750,
 		Person: "Někdo Neznámý", Purpose: "2026-04",
@@ -252,7 +252,7 @@ func TestReconcileTrulyUnknownPersonIsUnmatched(t *testing.T) {
 // [Go] Test that [?] markers are stripped from the Person field before lookup.
 func TestReconcileQuestionMarkMarkerStripped(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {750, 3}}}}
+	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}}}}
 	txs := []Transaction{{
 		Date: "2026-01-01", Amount: 750,
 		Person: "[?] Alice", Purpose: "2026-01",
@@ -269,7 +269,7 @@ func TestReconcileQuestionMarkMarkerStripped(t *testing.T) {
 // [Go] Purpose "other:shirt" puts payment in OtherTransactions, not in month ledger.
 func TestReconcileOtherPurpose(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {750, 3}}}}
+	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}}}}
 	txs := []Transaction{{
 		Date: "2026-01-01", Amount: 300,
 		Person: "Alice", Purpose: "other:shirt",
@@ -297,7 +297,7 @@ func TestReconcileOtherPurpose(t *testing.T) {
 func TestReconcileOutOfWindowGoesToCredit(t *testing.T) {
 	t.Parallel()
 	// Window shows only 2026-01. Transaction references 2026-01 (in) and 2026-02 (out).
-	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {600, 3}}}}
+	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 600, Attendance: 3}}}}
 	txs := []Transaction{{
 		Date: "2026-01-01", Amount: 1200,
 		Person: "Alice", Purpose: "2026-01, 2026-02",
@@ -322,7 +322,7 @@ func TestReconcileOutOfWindowGoesToCredit(t *testing.T) {
 // [Go] No person/purpose → inference fallback resolves sender name and date month.
 func TestReconcileInferenceFallback(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Tomáš Němeček", Tier: "A", Fees: map[string]FeeData{"2026-04": {750, 3}}}}
+	members := []Member{{Name: "Tomáš Němeček", Tier: "A", Fees: map[string]FeeData{"2026-04": {Expected: 750, Attendance: 3}}}}
 	txs := []Transaction{{
 		Date: "2026-04-15", Amount: 750,
 		// Person and Purpose are empty → inference path
@@ -340,7 +340,7 @@ func TestReconcileInferenceFallback(t *testing.T) {
 // [Go] Transaction with no match at all ends up in Unmatched; ledger unchanged.
 func TestReconcileNoMatchGoesToUnmatched(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {750, 3}}}}
+	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}}}}
 	txs := []Transaction{{
 		Date: "2026-01-01", Amount: 500,
 		// empty person+purpose and sender name not matching any member
@@ -360,7 +360,7 @@ func TestReconcileNoMatchGoesToUnmatched(t *testing.T) {
 // [Go] Empty transaction list leaves every month at paid=0 and balance=–expected.
 func TestReconcileNoTransactionsAllUnpaid(t *testing.T) {
 	t.Parallel()
-	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {750, 3}}}}
+	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}}}}
 
 	result := Reconcile(members, []string{"2026-01"}, nil, nil, defaultYear)
 

go/internal/io/fio/fio_test.go

@@ -98,8 +98,8 @@ func TestParseCzechDate(t *testing.T) {
 		{"7.5.2026", "2026-05-07"},  // non-padded — real Fio transparent page format
 		{"3.12.2025", "2025-12-03"}, // non-padded single-digit day, double-digit month
 		{"07.05.26", "2026-05-07"},  // padded 2-digit year — current Fio transparent page format
-		{"7.5.26", "2026-05-07"},   // non-padded 2-digit year
+		{"7.5.26", "2026-05-07"},    // non-padded 2-digit year
-		{"07/05/26", "2026-05-07"}, // slash variant
+		{"07/05/26", "2026-05-07"},  // slash variant
 		{"", ""},
 		{"invalid", ""},
 	}

go/internal/services/banksync/fio_table.go

@@ -2,10 +2,9 @@ package banksync
 
 import (
 	"fmt"
+	"fuj-management/go/internal/io/fio"
 	"io"
 	"text/tabwriter"
-
-	"fuj-management/go/internal/io/fio"
 )
 
 func printFioTable(w io.Writer, txns []fio.Transaction, syncIDs []string, existing map[string]bool) {

go/internal/services/membership/sources.go

@@ -25,12 +25,12 @@ const (
 	firstDateCol = 3
 )
 
-// adultMergedMonths mirrors ADULT_MERGED_MONTHS in scripts/attendance.py.
+// AdultMergedMonths mirrors ADULT_MERGED_MONTHS in scripts/attendance.py.
 // Source month → target month (source attendance accumulated into target).
-var adultMergedMonths = map[string]string{}
+var AdultMergedMonths = map[string]string{}
 
-// juniorMergedMonths mirrors JUNIOR_MERGED_MONTHS in scripts/attendance.py.
+// JuniorMergedMonths mirrors JUNIOR_MERGED_MONTHS in scripts/attendance.py.
-var juniorMergedMonths = map[string]string{
+var JuniorMergedMonths = map[string]string{
 	"2025-12": "2026-01",
 	"2025-09": "2025-10",
 }
@@ -195,7 +195,7 @@ func parseAdultRows(rows [][]string) ([]reconcile.Member, []string, error) {
 		return nil, nil, nil
 	}
 	dates := parseDates(rows[0])
-	months := groupByMonth(dates, adultMergedMonths)
+	months := groupByMonth(dates, AdultMergedMonths)
 	sortedMonths := sortedKeys(months)
 
 	var members []reconcile.Member
@@ -243,8 +243,8 @@ func parseJuniorRows(adultRows, juniorRows [][]string) ([]reconcile.Member, []st
 
 	mainDates := parseDates(adultRows[0])
 	juniorDates := parseDates(juniorRows[0])
-	mainMonths := groupByMonth(mainDates, juniorMergedMonths)
+	mainMonths := groupByMonth(mainDates, JuniorMergedMonths)
-	jrMonths := groupByMonth(juniorDates, juniorMergedMonths)
+	jrMonths := groupByMonth(juniorDates, JuniorMergedMonths)
 
 	allMonths := make(map[string]bool)
 	for m := range mainMonths {
@@ -337,7 +337,13 @@ func parseJuniorRows(adultRows, juniorRows [][]string) ([]reconcile.Member, []st
 			if !exp.Unknown {
 				fee = exp.Value
 			}
-			feeMap[m] = reconcile.FeeData{Expected: fee, Attendance: total}
+			feeMap[m] = reconcile.FeeData{
+				Expected:         fee,
+				IsUnknown:        exp.Unknown,
+				Attendance:       total,
+				JuniorAttendance: c.junior,
+				AdultAttendance:  c.adult,
+			}
 		}
 		members = append(members, reconcile.Member{Name: name, Tier: data.tier, Fees: feeMap})
 	}
@@ -365,11 +371,15 @@ func parseTransactionRows(rows [][]any) ([]reconcile.Transaction, error) {
 	}
 	idxDate := idx("date")
 	idxAmount := idx("amount")
+	idxManualFix := idx("manual fix")
 	idxPerson := idx("person")
 	idxPurpose := idx("purpose")
 	idxInferred := idx("inferred amount")
 	idxSender := idx("sender")
+	idxVS := idx("vs")
 	idxMessage := idx("message")
+	idxBankID := idx("bank id")
+	idxSyncID := idx("sync id")
 
 	for _, label := range []string{"date", "amount", "person", "purpose"} {
 		if idx(label) == -1 {
@@ -403,11 +413,15 @@ func parseTransactionRows(rows [][]any) ([]reconcile.Transaction, error) {
 		txns = append(txns, reconcile.Transaction{
 			Date:           dateStr,
 			Amount:         amount,
+			ManualFix:      getVal(row, idxManualFix),
 			Person:         getVal(row, idxPerson),
 			Purpose:        getVal(row, idxPurpose),
 			InferredAmount: inferredAmount,
 			Sender:         getVal(row, idxSender),
+			VS:             getVal(row, idxVS),
 			Message:        getVal(row, idxMessage),
+			BankID:         getVal(row, idxBankID),
+			SyncID:         getVal(row, idxSyncID),
 		})
 	}
 	return txns, nil

go/internal/web/api/build_adults.go

@@ -0,0 +1,263 @@
+package api
+
+import (
+	"fmt"
+	"fuj-management/go/internal/config"
+	"fuj-management/go/internal/services/membership"
+	"sort"
+	"time"
+
+	domreconcile "fuj-management/go/internal/domain/reconcile"
+)
+
+type monthSums struct{ expected, paid int }
+
+// buildAdultsResponse constructs the AdultsResponse wire type from reconcile output.
+// Mirrors scripts/views.py:build_adults_view_model.
+func buildAdultsResponse(
+	members []domreconcile.Member,
+	sortedMonths []string,
+	result domreconcile.Result,
+	txns []domreconcile.Transaction,
+	cfg config.Config,
+	currentMonth string,
+) AdultsResponse {
+	monthLabels := getMonthLabels(sortedMonths, membership.AdultMergedMonths)
+
+	// Collect tier-A names, sorted.
+	var adultNames []string
+	allNames := make([]string, 0, len(members))
+	for _, m := range members {
+		allNames = append(allNames, m.Name)
+		if m.Tier == "A" {
+			adultNames = append(adultNames, m.Name)
+		}
+	}
+	sort.Strings(adultNames)
+
+	// Per-month aggregate totals (expected and paid integers).
+	monthlyTotals := make(map[string]*monthSums, len(sortedMonths))
+	for _, m := range sortedMonths {
+		monthlyTotals[m] = &monthSums{}
+	}
+
+	var results []MemberRow
+	for _, name := range adultNames {
+		mr := result.Members[name]
+		row, unpaidMonths, rawUnpaidMonths := buildAdultMemberRow(name, mr, sortedMonths, monthLabels, currentMonth, monthlyTotals)
+		row.UnpaidPeriods = joinComma(unpaidMonths)
+		row.RawUnpaidPeriods = joinPlus(rawUnpaidMonths)
+		row.Balance = settledBalance(mr, currentMonth)
+		row.PayableAmount = max(0, -row.Balance)
+		results = append(results, row)
+	}
+
+	// Totals row.
+	totalsCells := make([]TotalCell, len(sortedMonths))
+	for i, m := range sortedMonths {
+		t := monthlyTotals[m] // *monthSums, never nil (initialised above)
+		status := "empty"
+		if t.expected > 0 || t.paid > 0 {
+			switch {
+			case t.paid == t.expected:
+				status = "ok"
+			case t.paid < t.expected:
+				status = "unpaid"
+			default:
+				status = "surplus"
+			}
+		}
+		totalsCells[i] = TotalCell{
+			Text:   fmt.Sprintf("%d / %d CZK", t.paid, t.expected),
+			Status: status,
+		}
+	}
+
+	// Credits and debts (settled balance, past months only).
+	var credits, debts []Credit
+	for _, name := range adultNames {
+		bal := settledBalance(result.Members[name], currentMonth)
+		if bal > 0 {
+			credits = append(credits, Credit{Name: name, Amount: bal})
+		} else if bal < 0 {
+			debts = append(debts, Credit{Name: name, Amount: -bal})
+		}
+	}
+	sort.Slice(credits, func(i, j int) bool { return credits[i].Name < credits[j].Name })
+	sort.Slice(debts, func(i, j int) bool { return debts[i].Name < debts[j].Name })
+
+	// member_data: full reconcile output for all members (not just adults).
+	memberData := make(map[string]AdultsMemberData, len(result.Members))
+	for name, mr := range result.Members {
+		months := make(map[string]AdultsMonthData, len(mr.Months))
+		for m, md := range mr.Months {
+			var exc *ExceptionData
+			if md.Exception != nil {
+				exc = &ExceptionData{Amount: md.Exception.Amount, Note: md.Exception.Note}
+			}
+			txEntries := make([]MemberTxEntry, len(md.Transactions))
+			for i, te := range md.Transactions {
+				txEntries[i] = memberTxFromDomain(te)
+			}
+			months[m] = AdultsMonthData{
+				Expected:         md.Expected,
+				OriginalExpected: md.OriginalExpected,
+				AttendanceCount:  md.AttendanceCount,
+				Exception:        exc,
+				Paid:             md.Paid,
+				Transactions:     txEntries,
+			}
+		}
+		otherTxs := make([]MemberOtherEntry, len(mr.OtherTransactions))
+		for i, oe := range mr.OtherTransactions {
+			otherTxs[i] = memberOtherFromDomain(oe)
+		}
+		memberData[name] = AdultsMemberData{
+			Tier:              mr.Tier,
+			Months:            months,
+			OtherTransactions: otherTxs,
+			TotalBalance:      mr.TotalBalance,
+		}
+	}
+
+	unmatched := make([]RawTransaction, len(result.Unmatched))
+	for i, tx := range result.Unmatched {
+		unmatched[i] = rawTxFromDomain(tx)
+	}
+
+	return AdultsResponse{
+		Months:        labelsForMonths(sortedMonths, monthLabels),
+		RawMonths:     sortedMonths,
+		Results:       ensureSlice(results),
+		Totals:        totalsCells,
+		MemberData:    memberData,
+		MonthLabels:   monthLabels,
+		RawPayments:   groupRawPaymentsByPerson(txns, allNames),
+		Credits:       ensureSlice(credits),
+		Debts:         ensureSlice(debts),
+		Unmatched:     unmatched,
+		AttendanceURL: "https://docs.google.com/spreadsheets/d/" + config.AttendanceSheetID + "/edit",
+		PaymentsURL:   "https://docs.google.com/spreadsheets/d/" + config.PaymentsSheetID + "/edit",
+		BankAccount:   cfg.BankAccount,
+		CurrentMonth:  currentMonth,
+	}
+}
+
+func buildAdultMemberRow(
+	name string,
+	mr domreconcile.MemberResult,
+	sortedMonths []string,
+	monthLabels map[string]string,
+	currentMonth string,
+	monthlyTotals map[string]*monthSums,
+) (row MemberRow, unpaidMonths, rawUnpaidMonths []string) {
+	row = MemberRow{Name: name}
+	for _, m := range sortedMonths {
+		md, ok := mr.Months[m]
+		if !ok {
+			md = domreconcile.MonthData{}
+		}
+		paid := int(md.Paid)
+		expected := md.Expected
+
+		if t := monthlyTotals[m]; t != nil {
+			t.expected += expected
+			t.paid += paid
+		}
+
+		var feeDisplay string
+		var isOverridden bool
+		if md.Exception != nil && md.Exception.Amount != md.OriginalExpected {
+			isOverridden = true
+			if md.AttendanceCount > 0 {
+				feeDisplay = fmt.Sprintf("%d (%d) CZK (%d)", md.Exception.Amount, md.OriginalExpected, md.AttendanceCount)
+			} else {
+				feeDisplay = fmt.Sprintf("%d (%d) CZK", md.Exception.Amount, md.OriginalExpected)
+			}
+		} else {
+			if md.AttendanceCount > 0 {
+				feeDisplay = fmt.Sprintf("%d CZK (%d)", expected, md.AttendanceCount)
+			} else {
+				feeDisplay = fmt.Sprintf("%d CZK", expected)
+			}
+		}
+
+		status := "empty"
+		cellText := "-"
+		amountToPay := 0
+
+		switch {
+		case expected > 0:
+			amountToPay = max(0, expected-paid)
+			switch {
+			case paid >= expected:
+				status = "ok"
+				cellText = fmt.Sprintf("%d/%s", paid, feeDisplay)
+			case paid > 0:
+				status = "partial"
+				cellText = fmt.Sprintf("%d/%s", paid, feeDisplay)
+				if m < currentMonth {
+					unpaidMonths = append(unpaidMonths, monthLabels[m])
+					rawUnpaidMonths = append(rawUnpaidMonths, rawMonthLabel(m))
+				}
+			default:
+				status = "unpaid"
+				cellText = fmt.Sprintf("0/%s", feeDisplay)
+				if m < currentMonth {
+					unpaidMonths = append(unpaidMonths, monthLabels[m])
+					rawUnpaidMonths = append(rawUnpaidMonths, rawMonthLabel(m))
+				}
+			}
+		case paid > 0:
+			status = "surplus"
+			cellText = fmt.Sprintf("PAID %d", paid)
+		}
+
+		tooltip := ""
+		if expected > 0 || paid > 0 {
+			tooltip = fmt.Sprintf("Received: %d, Expected: %d", paid, expected)
+		}
+
+		row.Months = append(row.Months, MonthCell{
+			Text:       cellText,
+			Overridden: isOverridden,
+			Status:     status,
+			Amount:     amountToPay,
+			Month:      monthLabels[m],
+			RawMonth:   m,
+			Tooltip:    tooltip,
+		})
+	}
+	return row, unpaidMonths, rawUnpaidMonths
+}
+
+// rawMonthLabel converts "YYYY-MM" to "MM/YYYY" matching Python's strftime("%m/%Y").
+func rawMonthLabel(m string) string {
+	dt, err := time.Parse("2006-01", m)
+	if err != nil {
+		return m
+	}
+	return dt.Format("01/2006")
+}
+
+func joinComma(parts []string) string {
+	if len(parts) == 0 {
+		return ""
+	}
+	result := parts[0]
+	for _, p := range parts[1:] {
+		result += ", " + p
+	}
+	return result
+}
+
+func joinPlus(parts []string) string {
+	if len(parts) == 0 {
+		return ""
+	}
+	result := parts[0]
+	for _, p := range parts[1:] {
+		result += "+" + p
+	}
+	return result
+}

go/internal/web/api/build_common.go

@@ -0,0 +1,184 @@
+package api
+
+import (
+	"fuj-management/go/internal/domain/czech"
+	"regexp"
+	"sort"
+	"strings"
+	"time"
+
+	domreconcile "fuj-management/go/internal/domain/reconcile"
+)
+
+// getMonthLabels builds display labels for sortedMonths, merging month names
+// (e.g. "Dec+Jan 2026") when mergedMonths maps a source month into this target.
+// Mirrors scripts/views.py:get_month_labels.
+func getMonthLabels(sortedMonths []string, mergedMonths map[string]string) map[string]string {
+	labels := make(map[string]string, len(sortedMonths))
+	for _, m := range sortedMonths {
+		dt, err := time.Parse("2006-01", m)
+		if err != nil {
+			labels[m] = m
+			continue
+		}
+		var mergedIn []string
+		for src, dst := range mergedMonths {
+			if dst == m {
+				mergedIn = append(mergedIn, src)
+			}
+		}
+		sort.Strings(mergedIn)
+		if len(mergedIn) == 0 {
+			labels[m] = dt.Format("Jan 2006")
+			continue
+		}
+		allMonths := append(mergedIn, m) //nolint:gocritic // intentional: mergedIn already owned
+		sort.Strings(allMonths)
+		years := map[int]bool{}
+		for _, x := range allMonths {
+			if d, err2 := time.Parse("2006-01", x); err2 == nil {
+				years[d.Year()] = true
+			}
+		}
+		parts := make([]string, 0, len(allMonths))
+		if len(years) > 1 {
+			for _, x := range allMonths {
+				if d, err2 := time.Parse("2006-01", x); err2 == nil {
+					parts = append(parts, d.Format("Jan 2006"))
+				}
+			}
+			labels[m] = strings.Join(parts, "+")
+		} else {
+			for _, x := range allMonths {
+				if d, err2 := time.Parse("2006-01", x); err2 == nil {
+					parts = append(parts, d.Format("Jan"))
+				}
+			}
+			labels[m] = strings.Join(parts, "+") + " " + dt.Format("2006")
+		}
+	}
+	return labels
+}
+
+// labelsForMonths returns the display labels for sortedMonths in slice order.
+func labelsForMonths(sortedMonths []string, labels map[string]string) []string {
+	out := make([]string, len(sortedMonths))
+	for i, m := range sortedMonths {
+		out[i] = labels[m]
+	}
+	return out
+}
+
+var questionMarkRe = regexp.MustCompile(`\[\?\]\s*`)
+
+// canonicalKey returns a normalized form of a person name used for deduplication.
+// Mirrors scripts/match_payments.py:canonical_member_key.
+func canonicalKey(name string) string {
+	return strings.Join(strings.Fields(czech.Normalize(name)), " ")
+}
+
+// groupRawPaymentsByPerson groups transactions by the "person" column,
+// canonicalizing names against memberNames where possible.
+// Mirrors scripts/views.py:group_payments_by_person (without the
+// "Unmatched / Unknown" bucket that is payments-view-specific).
+func groupRawPaymentsByPerson(txns []domreconcile.Transaction, memberNames []string) map[string][]RawTransaction {
+	canonicalByKey := make(map[string]string, len(memberNames))
+	for _, n := range memberNames {
+		k := canonicalKey(n)
+		if _, exists := canonicalByKey[k]; !exists {
+			canonicalByKey[k] = n
+		}
+	}
+	grouped := make(map[string][]RawTransaction)
+	for _, tx := range txns {
+		person := strings.TrimSpace(tx.Person)
+		if person == "" {
+			continue
+		}
+		for _, p := range strings.Split(person, ",") {
+			p = questionMarkRe.ReplaceAllString(p, "")
+			p = strings.TrimSpace(p)
+			if p == "" {
+				continue
+			}
+			key := p
+			if canonical, ok := canonicalByKey[canonicalKey(p)]; ok {
+				key = canonical
+			}
+			grouped[key] = append(grouped[key], rawTxFromDomain(tx))
+		}
+	}
+	for k := range grouped {
+		sort.Slice(grouped[k], func(i, j int) bool {
+			return grouped[k][i].Date > grouped[k][j].Date
+		})
+	}
+	return grouped
+}
+
+// rawTxFromDomain converts a domain Transaction to the wire RawTransaction.
+func rawTxFromDomain(tx domreconcile.Transaction) RawTransaction {
+	inferredAmount := 0.0
+	if tx.InferredAmount != nil {
+		inferredAmount = *tx.InferredAmount
+	}
+	return RawTransaction{
+		Date:           tx.Date,
+		Amount:         tx.Amount,
+		ManualFix:      tx.ManualFix,
+		Person:         tx.Person,
+		Purpose:        tx.Purpose,
+		InferredAmount: inferredAmount,
+		Sender:         tx.Sender,
+		VS:             tx.VS,
+		Message:        tx.Message,
+		BankID:         tx.BankID,
+		SyncID:         tx.SyncID,
+	}
+}
+
+// memberTxFromDomain converts a domain TxEntry to a wire MemberTxEntry.
+func memberTxFromDomain(te domreconcile.TxEntry) MemberTxEntry {
+	return MemberTxEntry{
+		Amount:     te.Amount,
+		Date:       te.Date,
+		Sender:     te.Sender,
+		Message:    te.Message,
+		Confidence: te.Confidence,
+	}
+}
+
+// memberOtherFromDomain converts a domain OtherEntry to a wire MemberOtherEntry.
+func memberOtherFromDomain(oe domreconcile.OtherEntry) MemberOtherEntry {
+	return MemberOtherEntry{
+		Amount:     oe.Amount,
+		Date:       oe.Date,
+		Sender:     oe.Sender,
+		Message:    oe.Message,
+		Purpose:    oe.Purpose,
+		Confidence: oe.Confidence,
+	}
+}
+
+// settledBalance computes the settled balance: sum of (paid − expected) for months
+// strictly before currentMonth. Months with IsUnknown=true are excluded to match
+// Python's isinstance(exp, int) guard (skips "?" months).
+func settledBalance(mr domreconcile.MemberResult, currentMonth string) int {
+	total := 0
+	for m, md := range mr.Months {
+		if m >= currentMonth || md.IsUnknown {
+			continue
+		}
+		total += int(md.Paid) - md.Expected
+	}
+	return total
+}
+
+// ensureSlice returns s unchanged when non-nil, or an empty (non-nil) slice so
+// json.Marshal emits [] instead of null.
+func ensureSlice[T any](s []T) []T {
+	if s == nil {
+		return []T{}
+	}
+	return s
+}

go/internal/web/api/build_juniors.go

@@ -0,0 +1,276 @@
+package api
+
+import (
+	"fmt"
+	"fuj-management/go/internal/config"
+	"fuj-management/go/internal/services/membership"
+	"sort"
+	"strconv"
+
+	domreconcile "fuj-management/go/internal/domain/reconcile"
+)
+
+// buildJuniorsResponse constructs the JuniorsResponse wire type from reconcile output.
+// Mirrors scripts/views.py:build_juniors_view_model.
+func buildJuniorsResponse(
+	members []domreconcile.Member,
+	sortedMonths []string,
+	result domreconcile.Result,
+	txns []domreconcile.Transaction,
+	cfg config.Config,
+	currentMonth string,
+) JuniorsResponse {
+	monthLabels := getMonthLabels(sortedMonths, membership.JuniorMergedMonths)
+
+	allNames := make([]string, 0, len(members))
+	juniorNames := make([]string, 0, len(members))
+	for _, m := range members {
+		allNames = append(allNames, m.Name)
+		juniorNames = append(juniorNames, m.Name)
+	}
+	sort.Strings(juniorNames)
+
+	monthlyTotals := make(map[string]*monthSums, len(sortedMonths))
+	for _, m := range sortedMonths {
+		monthlyTotals[m] = &monthSums{}
+	}
+
+	var results []MemberRow
+	for _, name := range juniorNames {
+		mr := result.Members[name]
+		row, unpaidMonths, rawUnpaidMonths := buildJuniorMemberRow(name, mr, sortedMonths, monthLabels, currentMonth, monthlyTotals)
+		row.UnpaidPeriods = joinComma(unpaidMonths)
+		row.RawUnpaidPeriods = joinPlus(rawUnpaidMonths)
+		row.Balance = settledBalance(mr, currentMonth)
+		row.PayableAmount = max(0, -row.Balance)
+		results = append(results, row)
+	}
+
+	// Totals row.
+	totalsCells := make([]TotalCell, len(sortedMonths))
+	for i, m := range sortedMonths {
+		t := monthlyTotals[m] // *monthSums, never nil (initialised above)
+		status := "empty"
+		if t.expected > 0 || t.paid > 0 {
+			switch {
+			case t.paid == t.expected:
+				status = "ok"
+			case t.paid < t.expected:
+				status = "unpaid"
+			default:
+				status = "surplus"
+			}
+		}
+		totalsCells[i] = TotalCell{
+			Text:   fmt.Sprintf("%d / %d CZK", t.paid, t.expected),
+			Status: status,
+		}
+	}
+
+	var credits, debts []Credit
+	for _, name := range juniorNames {
+		bal := settledBalance(result.Members[name], currentMonth)
+		if bal > 0 {
+			credits = append(credits, Credit{Name: name, Amount: bal})
+		} else if bal < 0 {
+			debts = append(debts, Credit{Name: name, Amount: -bal})
+		}
+	}
+	sort.Slice(credits, func(i, j int) bool { return credits[i].Name < credits[j].Name })
+	sort.Slice(debts, func(i, j int) bool { return debts[i].Name < debts[j].Name })
+
+	// member_data: full reconcile output for all junior members.
+	memberData := make(map[string]JuniorsMemberData, len(result.Members))
+	for name, mr := range result.Members {
+		months := make(map[string]JuniorsMonthData, len(mr.Months))
+		for m, md := range mr.Months {
+			var exc *ExceptionData
+			if md.Exception != nil {
+				exc = &ExceptionData{Amount: md.Exception.Amount, Note: md.Exception.Note}
+			}
+			txEntries := make([]MemberTxEntry, len(md.Transactions))
+			for i, te := range md.Transactions {
+				txEntries[i] = memberTxFromDomain(te)
+			}
+			months[m] = JuniorsMonthData{
+				Expected:         juniorExpected(md),
+				OriginalExpected: juniorOriginalExpected(md),
+				AttendanceCount:  md.AttendanceCount,
+				Exception:        exc,
+				Paid:             md.Paid,
+				Transactions:     txEntries,
+			}
+		}
+		otherTxs := make([]MemberOtherEntry, len(mr.OtherTransactions))
+		for i, oe := range mr.OtherTransactions {
+			otherTxs[i] = memberOtherFromDomain(oe)
+		}
+		memberData[name] = JuniorsMemberData{
+			Tier:              mr.Tier,
+			Months:            months,
+			OtherTransactions: otherTxs,
+			TotalBalance:      mr.TotalBalance,
+		}
+	}
+
+	unmatched := make([]RawTransaction, len(result.Unmatched))
+	for i, tx := range result.Unmatched {
+		unmatched[i] = rawTxFromDomain(tx)
+	}
+
+	juniorURL := "https://docs.google.com/spreadsheets/d/" + config.AttendanceSheetID +
+		"/edit#gid=" + config.JuniorSheetGID
+
+	return JuniorsResponse{
+		Months:        labelsForMonths(sortedMonths, monthLabels),
+		RawMonths:     sortedMonths,
+		Results:       ensureSlice(results),
+		Totals:        totalsCells,
+		MemberData:    memberData,
+		MonthLabels:   monthLabels,
+		RawPayments:   groupRawPaymentsByPerson(txns, allNames),
+		Credits:       ensureSlice(credits),
+		Debts:         ensureSlice(debts),
+		Unmatched:     unmatched,
+		AttendanceURL: juniorURL,
+		PaymentsURL:   "https://docs.google.com/spreadsheets/d/" + config.PaymentsSheetID + "/edit",
+		BankAccount:   cfg.BankAccount,
+		CurrentMonth:  currentMonth,
+	}
+}
+
+func buildJuniorMemberRow(
+	name string,
+	mr domreconcile.MemberResult,
+	sortedMonths []string,
+	monthLabels map[string]string,
+	currentMonth string,
+	monthlyTotals map[string]*monthSums,
+) (row MemberRow, unpaidMonths, rawUnpaidMonths []string) {
+	row = MemberRow{Name: name}
+	for _, m := range sortedMonths {
+		md, ok := mr.Months[m]
+		if !ok {
+			md = domreconcile.MonthData{}
+		}
+		paid := int(md.Paid)
+
+		// Update monthly totals (skip "?" months for expected).
+		if t := monthlyTotals[m]; t != nil {
+			if !md.IsUnknown {
+				t.expected += md.Expected
+			}
+			t.paid += paid
+		}
+
+		// Attendance breakdown string e.g. ":3J,2A".
+		var breakdown string
+		jc, ac := md.JuniorAttendance, md.AdultAttendance
+		switch {
+		case jc > 0 && ac > 0:
+			breakdown = fmt.Sprintf(":%dJ,%dA", jc, ac)
+		case jc > 0:
+			breakdown = fmt.Sprintf(":%dJ", jc)
+		case ac > 0:
+			breakdown = fmt.Sprintf(":%dA", ac)
+		}
+		countStr := ""
+		if md.AttendanceCount > 0 {
+			countStr = fmt.Sprintf(" (%d%s)", md.AttendanceCount, breakdown)
+		}
+
+		// Fee display string.
+		var feeDisplay string
+		var isOverridden bool
+		if md.Exception != nil {
+			overrideAmount := md.Exception.Amount
+			var origStr string
+			if md.IsUnknown {
+				origStr = "?"
+				isOverridden = true
+			} else {
+				origStr = strconv.Itoa(md.OriginalExpected)
+				isOverridden = overrideAmount != md.OriginalExpected
+			}
+			if isOverridden {
+				feeDisplay = fmt.Sprintf("%d (%s) CZK%s", overrideAmount, origStr, countStr)
+			} else {
+				feeDisplay = fmt.Sprintf("%d CZK%s", md.Expected, countStr)
+			}
+		} else {
+			if md.IsUnknown {
+				feeDisplay = "? CZK" + countStr
+			} else {
+				feeDisplay = fmt.Sprintf("%d CZK%s", md.Expected, countStr)
+			}
+		}
+
+		status := "empty"
+		cellText := "-"
+		amountToPay := 0
+
+		switch {
+		case md.IsUnknown:
+			cellText = "?" + countStr
+		case md.Expected > 0:
+			switch {
+			case paid >= md.Expected:
+				status = "ok"
+				cellText = fmt.Sprintf("%d/%s", paid, feeDisplay)
+			case paid > 0:
+				status = "partial"
+				cellText = fmt.Sprintf("%d/%s", paid, feeDisplay)
+				amountToPay = md.Expected - paid
+				if m < currentMonth {
+					unpaidMonths = append(unpaidMonths, monthLabels[m])
+					rawUnpaidMonths = append(rawUnpaidMonths, rawMonthLabel(m))
+				}
+			default:
+				status = "unpaid"
+				cellText = fmt.Sprintf("0/%s", feeDisplay)
+				amountToPay = md.Expected
+				if m < currentMonth {
+					unpaidMonths = append(unpaidMonths, monthLabels[m])
+					rawUnpaidMonths = append(rawUnpaidMonths, rawMonthLabel(m))
+				}
+			}
+		case paid > 0:
+			status = "surplus"
+			cellText = fmt.Sprintf("PAID %d", paid)
+		}
+
+		tooltip := ""
+		if (!md.IsUnknown && md.Expected > 0) || paid > 0 {
+			tooltip = fmt.Sprintf("Received: %d, Expected: %d", paid, md.Expected)
+		}
+
+		row.Months = append(row.Months, MonthCell{
+			Text:       cellText,
+			Overridden: isOverridden,
+			Status:     status,
+			Amount:     amountToPay,
+			Month:      monthLabels[m],
+			RawMonth:   m,
+			Tooltip:    tooltip,
+		})
+	}
+	return row, unpaidMonths, rawUnpaidMonths
+}
+
+// juniorExpected converts domain MonthData to the Expected wire type.
+// When an exception exists it always produces a concrete int; otherwise
+// the "?" sentinel is used when IsUnknown=true.
+func juniorExpected(md domreconcile.MonthData) Expected {
+	if md.Exception == nil && md.IsUnknown {
+		return Expected{Unknown: true}
+	}
+	return Expected{Value: md.Expected}
+}
+
+// juniorOriginalExpected converts the original (pre-exception) expected fee.
+func juniorOriginalExpected(md domreconcile.MonthData) Expected {
+	if md.IsUnknown {
+		return Expected{Unknown: true}
+	}
+	return Expected{Value: md.OriginalExpected}
+}

go/internal/web/api/build_payments.go

@@ -0,0 +1,44 @@
+package api
+
+import (
+	"fuj-management/go/internal/config"
+	"sort"
+	"strings"
+
+	domreconcile "fuj-management/go/internal/domain/reconcile"
+)
+
+// buildPaymentsResponse constructs the PaymentsResponse wire type.
+// Mirrors scripts/views.py:build_payments_view_model.
+func buildPaymentsResponse(
+	txns []domreconcile.Transaction,
+	memberNames []string,
+) PaymentsResponse {
+	grouped := groupRawPaymentsByPerson(txns, memberNames)
+
+	// Add unmatched/unknown bucket for transactions with no person set.
+	const unknownKey = "Unmatched / Unknown"
+	for _, tx := range txns {
+		if strings.TrimSpace(tx.Person) == "" {
+			grouped[unknownKey] = append(grouped[unknownKey], rawTxFromDomain(tx))
+		}
+	}
+	// Sort the unknown bucket newest-first (others are sorted in groupRawPaymentsByPerson).
+	if rows, ok := grouped[unknownKey]; ok {
+		sort.Slice(rows, func(i, j int) bool { return rows[i].Date > rows[j].Date })
+		grouped[unknownKey] = rows
+	}
+
+	sortedPeople := make([]string, 0, len(grouped))
+	for p := range grouped {
+		sortedPeople = append(sortedPeople, p)
+	}
+	sort.Strings(sortedPeople)
+
+	return PaymentsResponse{
+		GroupedPayments: grouped,
+		SortedPeople:    sortedPeople,
+		AttendanceURL:   "https://docs.google.com/spreadsheets/d/" + config.AttendanceSheetID + "/edit",
+		PaymentsURL:     "https://docs.google.com/spreadsheets/d/" + config.PaymentsSheetID + "/edit",
+	}
+}

go/internal/web/api/handler.go

@@ -0,0 +1,125 @@
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"fuj-management/go/internal/config"
+	"fuj-management/go/internal/services/membership"
+	"log/slog"
+	"net/http"
+	"time"
+
+	domreconcile "fuj-management/go/internal/domain/reconcile"
+)
+
+// Handler holds the shared dependencies for all /api/* routes.
+type Handler struct {
+	BuildVersion string
+	BuildCommit  string
+	BuildDate    string
+	Sources      membership.Sources
+	Config       config.Config
+	Logger       *slog.Logger
+}
+
+// ServeVersion handles GET /api/version.
+func (h *Handler) ServeVersion(w http.ResponseWriter, r *http.Request) {
+	writeJSON(w, VersionResponse{
+		Tag:       h.BuildVersion,
+		Commit:    h.BuildCommit,
+		BuildDate: h.BuildDate,
+	})
+}
+
+// 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)
+	if err != nil {
+		h.writeError(w, r, err)
+		return
+	}
+	result := domreconcile.Reconcile(members, sortedMonths, txns, exceptions, time.Now().Year())
+	writeJSON(w, buildAdultsResponse(members, sortedMonths, result, txns, h.Config, time.Now().Format("2006-01")))
+}
+
+// ServeJuniors handles GET /api/juniors.
+func (h *Handler) ServeJuniors(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	members, sortedMonths, txns, exceptions, err := h.loadAll(ctx, false)
+	if err != nil {
+		h.writeError(w, r, err)
+		return
+	}
+	result := domreconcile.Reconcile(members, sortedMonths, txns, exceptions, time.Now().Year())
+	writeJSON(w, buildJuniorsResponse(members, sortedMonths, result, txns, h.Config, time.Now().Format("2006-01")))
+}
+
+// ServePayments handles GET /api/payments.
+func (h *Handler) ServePayments(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	txns, err := h.Sources.LoadTransactions(ctx)
+	if err != nil {
+		h.writeError(w, r, fmt.Errorf("load transactions: %w", err))
+		return
+	}
+	writeJSON(w, buildPaymentsResponse(txns, h.allMemberNames(ctx)))
+}
+
+func (h *Handler) loadAll(ctx context.Context, adults bool) (
+	members []domreconcile.Member,
+	sortedMonths []string,
+	txns []domreconcile.Transaction,
+	exceptions map[domreconcile.ExceptionKey]domreconcile.Exception,
+	err error,
+) {
+	if adults {
+		members, sortedMonths, err = h.Sources.LoadAdults(ctx)
+	} else {
+		members, sortedMonths, err = h.Sources.LoadJuniors(ctx)
+	}
+	if err != nil {
+		err = fmt.Errorf("load members: %w", err)
+		return
+	}
+	txns, err = h.Sources.LoadTransactions(ctx)
+	if err != nil {
+		err = fmt.Errorf("load transactions: %w", err)
+		return
+	}
+	exceptions, err = h.Sources.LoadExceptions(ctx)
+	if err != nil {
+		err = fmt.Errorf("load exceptions: %w", err)
+	}
+	return
+}
+
+func (h *Handler) allMemberNames(ctx context.Context) []string {
+	var names []string
+	if adults, _, err := h.Sources.LoadAdults(ctx); err == nil {
+		for _, m := range adults {
+			names = append(names, m.Name)
+		}
+	}
+	if juniors, _, err := h.Sources.LoadJuniors(ctx); err == nil {
+		for _, m := range juniors {
+			names = append(names, m.Name)
+		}
+	}
+	return names
+}
+
+func (h *Handler) writeError(w http.ResponseWriter, r *http.Request, err error) {
+	if h.Logger != nil {
+		h.Logger.Error("api error", "path", r.URL.Path, "err", err)
+	}
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(http.StatusInternalServerError)
+	_ = json.NewEncoder(w).Encode(map[string]string{"error": err.Error()})
+}
+
+func writeJSON(w http.ResponseWriter, v any) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	_ = json.NewEncoder(w).Encode(v)
+}

go/internal/web/server.go

@@ -2,6 +2,9 @@ package web
 
 import (
 	"fmt"
+	"fuj-management/go/internal/config"
+	"fuj-management/go/internal/services/membership"
+	"fuj-management/go/internal/web/api"
 	"fuj-management/go/internal/web/middleware"
 	"log/slog"
 	"net/http"
@@ -15,9 +18,22 @@ type BuildInfo struct {
 }
 
 // Run registers routes and starts the HTTP server on addr.
-func Run(logger *slog.Logger, addr string, build BuildInfo) error {
+func Run(logger *slog.Logger, addr string, build BuildInfo, sources membership.Sources, cfg config.Config) error {
+	h := &api.Handler{
+		BuildVersion: build.Version,
+		BuildCommit:  build.Commit,
+		BuildDate:    build.BuildDate,
+		Sources:      sources,
+		Config:       cfg,
+		Logger:       logger,
+	}
+
 	mux := http.NewServeMux()
 	mux.HandleFunc("GET /{$}", helloHandler(build))
+	mux.HandleFunc("GET /api/version", h.ServeVersion)
+	mux.HandleFunc("GET /api/adults", h.ServeAdults)
+	mux.HandleFunc("GET /api/juniors", h.ServeJuniors)
+	mux.HandleFunc("GET /api/payments", h.ServePayments)
 
 	logger.Info("starting server", "addr", addr)
 	return http.ListenAndServe(addr, middleware.RequestTimer(logger, mux))