chore(changelog): add entry for fee rate update 2026-05 through 2026-08

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

.gitignore

@@ -7,3 +7,4 @@ tmp/
 
 # go build output
 bin/
+go/parity

CHANGELOG.md

@@ -1,5 +1,20 @@
 # Changelog
 
+## 2026-05-24 21:58 CEST — feat(fees): update adult monthly rates for 2026-05 through 2026-08
+
+- 2026-05: 700 → 450 CZK; 2026-06/07/08: 600 CZK (new months added).
+- Mirrored in both `scripts/attendance.py` and `go/internal/domain/fees/fees.go`.
+
+## 2026-05-24 21:42 CEST — feat: multi-account Fio sync + switch QR default to 2502035405/2010
+
+- Added second bank account `2502035405/2010` (IBAN `CZ0820100000002502035405`) to sync.
+- Both accounts are fetched on every sync; dedup by existing sync_id keeps the payments sheet clean.
+- QR codes now default to the new account (`CZ0820100000002502035405`).
+- Go: `config.go` gains hardcoded `Accounts`/`LoadedAccount` slice; `Config.BankAccount` renamed to `Config.QRAccount`; `FioAPIToken` removed (tokens are per-account via `FIO_API_TOKEN_NEW` / `FIO_API_TOKEN_OLD`).
+- Go: `SyncToSheets` now accepts `[]fio.Client`; new `TestSyncToSheets_MultiAccount` test.
+- Python: `config.py` gains `ACCOUNTS` / `LOADED_ACCOUNTS`; `fio_utils.py` adds `fetch_transactions_for` and `fetch_transactions_all`; `sync_fio_to_sheets.py` uses `fetch_transactions_all`.
+- Key files: `go/internal/config/config.go`, `go/internal/services/banksync/sync.go`, `go/cmd/fuj/main.go`, `scripts/config.py`, `scripts/fio_utils.py`, `scripts/sync_fio_to_sheets.py`.
+
 ## 2026-05-11 23:58 CEST — fix(reconcile): fill earliest month deficit first in multi-month allocations
 
 - Multi-month payment allocation now fills the earliest in-window deficit first and spills

docs/plans/2026-05-24-2120-multi-account-bank-sync.md

@@ -0,0 +1,269 @@
+# Multi-account Fio sync + switch QR target to 2502035405/2010
+
+## Context
+
+The club is opening a second Fio transparent account, **`2502035405/2010`** (IBAN
+`CZ??...0000002502035405`). Going forward:
+
+- **Sync** must pull transactions from **both** accounts into the existing
+  payments sheet — the old `2800359168/2010` stays active so historical fees
+  paid to it still reconcile.
+- **QR codes** generated by `/qr` should default to the **new** account
+  (`2502035405/2010`), so new payers send money there.
+
+The payments sheet schema and `sync_id` hash stay **unchanged** — no
+"Source Account" column, no migration, no risk of re-appending historical rows.
+Bank-ID uniqueness from Fio plus the existing hash inputs are good enough to
+dedupe across two transparent accounts in practice.
+
+Implementation order: Go first, then port to Python. Both apps use the same
+`PaymentsSheetID`, so once Go writes from two accounts the Python code only
+needs to do the same when invoked.
+
+### Decisions locked in with the user
+- **Config style:** hardcoded list of accounts in `config.go` / `config.py`
+  (sheet IDs are already hardcoded; tokens stay env-driven).
+- **Source tagging:** no schema change, `sync_id` formula unchanged.
+- **Old account:** kept syncing in parallel; only QR target changes.
+
+---
+
+## Go implementation
+
+### 1. Config — hardcoded `Accounts` list, derived `QRAccount`
+
+[go/internal/config/config.go](../../go/internal/config/config.go)
+
+- Replace scalar `BankAccount` + `FioAPIToken` with a hardcoded slice and a
+  primary pointer. Tokens stay env-driven via per-account env names.
+
+  ```go
+  // Account describes one Fio bank account we sync from.
+  type Account struct {
+      IBAN     string // e.g. "CZ0820100000002502035405"
+      AcctNum  string // bare account number, e.g. "2502035405"
+      TokenEnv string // env var name holding the Fio API token (empty token => transparent scraper path)
+      Primary  bool   // true for the QR-code default account
+  }
+
+  var Accounts = []Account{
+      {IBAN: "CZ0820100000002502035405", AcctNum: "2502035405", TokenEnv: "FIO_API_TOKEN_NEW", Primary: true},
+      {IBAN: "CZ8520100000002800359168", AcctNum: "2800359168", TokenEnv: "FIO_API_TOKEN_OLD"},
+  }
+  ```
+  Compute the **real** IBAN check digit for `2502035405` once and bake it in
+  (replace the `85` placeholder above). The same `IBANAccountNum` helper at
+  [config.go:66](../../go/internal/config/config.go#L66) keeps producing
+  `AcctNum`, but having it on the struct avoids re-parsing at every call site.
+
+- `Config` struct:
+  - Drop `BankAccount` and `FioAPIToken` fields.
+  - Add `QRAccount string` (the IBAN of `Accounts[i].Primary == true`).
+  - Add `LoadedAccounts []LoadedAccount` where each entry pairs an `Account`
+    with the token resolved from `os.Getenv(account.TokenEnv)`.
+- `Load()` reads each `TokenEnv` and stores tokens with the account. Logs a
+  warning (info-level) if no token is set — that's the transparent-scraper
+  path, which is fine.
+
+### 2. Sync loop — one `fio.Client` per account, single dedup pass
+
+[go/internal/services/banksync/sync.go](../../go/internal/services/banksync/sync.go)
+
+Change `SyncToSheets` to accept a slice of clients instead of one:
+
+```go
+func SyncToSheets(
+    ctx context.Context,
+    spreadsheetID string,
+    fioClients []fio.Client, // was: fioClient fio.Client
+    sh sheetsWriter,
+    opts SyncOpts,
+) (int, error)
+```
+
+Inside:
+
+- Keep steps 1 (read existing IDs) and 2 (date window) as-is.
+- Step 3 (fetch) becomes a loop: call `FetchTransactions` on each client; tag
+  each `fio.Transaction` with the account it came from for logging only
+  (don't write it to the sheet). Concatenate into one slice `txns`.
+- Steps 4a–4c (sync_id calc, debug table, row build, dedup) are unchanged —
+  the combined `txns` slice flows through the same code path. Existing
+  `sync_id` collisions across accounts are dropped silently, which is the
+  desired dedup behaviour.
+- `printFioTable` (dry-run debug) should print an extra column showing the
+  source account so per-account fetches are visible — small change in
+  [fio_table.go](../../go/internal/services/banksync/fio_table.go).
+
+Logger output: log fetched count per account and the total combined count.
+
+### 3. Call sites — build clients from the config list
+
+Both entry points construct `[]fio.Client`, one per `LoadedAccount`:
+
+- [go/cmd/fuj/main.go:91](../../go/cmd/fuj/main.go#L91) — server `BankSync` action.
+- [go/cmd/fuj/main.go:200](../../go/cmd/fuj/main.go#L200) — `fuj sync` CLI.
+
+Helper to add somewhere in `cmd/fuj/main.go` or a new
+`internal/services/banksync/clients.go`:
+
+```go
+func clientsFromConfig(cfg config.Config) []fio.Client {
+    out := make([]fio.Client, 0, len(cfg.LoadedAccounts))
+    for _, a := range cfg.LoadedAccounts {
+        out = append(out, fio.New(a.Token, a.AcctNum, nil))
+    }
+    return out
+}
+```
+
+The existing factory at
+[go/internal/io/fio/client.go:35](../../go/internal/io/fio/client.go#L35)
+already routes per-account between the API path and the transparent scraper
+based on whether the token is empty — no change there.
+
+### 4. QR endpoint — default to `QRAccount`
+
+[go/internal/web/html_handler.go:129](../../go/internal/web/html_handler.go#L129)
+and [html_handler.go:135](../../go/internal/web/html_handler.go#L135):
+swap `h.apiHandler.Config.BankAccount` → `h.apiHandler.Config.QRAccount`.
+
+API DTOs that surface the payment account in JSON:
+[build_adults.go:141](../../go/internal/web/api/build_adults.go#L141) and
+[build_juniors.go:137](../../go/internal/web/api/build_juniors.go#L137) — same
+swap.
+
+The fields on the API structs at
+[adults.go:40](../../go/internal/web/api/adults.go#L40) and
+[juniors.go:39](../../go/internal/web/api/juniors.go#L39) keep their JSON
+names so the Python parity binary doesn't see a schema diff.
+
+### 5. Tests
+
+- **New** [go/internal/services/banksync/sync_test.go](../../go/internal/services/banksync/sync_test.go):
+  add a test `TestSyncToSheets_MultiAccount` that wires up two fake
+  `fio.Client`s (via the existing
+  [fake.go](../../go/internal/io/fio/fake.go)), one returning a txn unique to
+  it and one returning a txn that duplicates an existing sync_id. Assert:
+  rows from both accounts get appended, the duplicate is dropped.
+- **Update** [go/internal/web/html_handler_test.go:207](../../go/internal/web/html_handler_test.go#L207)
+  `TestServeQR` and [qr_test.go](../../go/internal/web/qr_test.go)
+  `TestQRBuildSPD` — expected SPD strings now contain the new IBAN by default.
+- **Update** any config tests asserting `cfg.BankAccount` directly to use
+  `cfg.QRAccount` and the new `LoadedAccounts` slice. (Grep for `BankAccount`
+  under `go/` after the rename.)
+- Existing fio parser tests
+  ([fio_test.go](../../go/internal/io/fio/fio_test.go)) and sync_id test
+  ([synch_test.go](../../go/internal/domain/synch/synch_test.go)) need no
+  changes — they don't know about the account list.
+
+### 6. Verification (Go)
+
+1. `cd go && go build ./... && go test ./...` — all green.
+2. `FIO_API_TOKEN_NEW="" FIO_API_TOKEN_OLD="" ./build/fuj sync --dry-run --print-fio-table --days 7`
+   — see fetched transactions from **both** accounts, with NEW/DUP status,
+   without writing.
+3. `./build/fuj server` then visit
+   `http://localhost:8080/qr?amount=700&message=test` — QR payload SPD must
+   contain the new IBAN `CZ??...2502035405`.
+4. Real sync once dry-run looks right: `./build/fuj sync --days 30` — confirm
+   in the Google sheet that rows from the old account still appear and no
+   duplicates are written.
+
+---
+
+## Python port (after Go is merged)
+
+The Python app uses the same payments sheet and the same column schema, so
+the port mirrors the Go change one-for-one. Goal: one round-trip of
+`make sync-2026` pulls from both accounts.
+
+### 1. `scripts/config.py`
+
+- Replace the scalar `BANK_ACCOUNT` constant at
+  [scripts/config.py:25](../../scripts/config.py#L25) with a hardcoded list
+  plus a derived primary:
+
+  ```python
+  ACCOUNTS = [
+      {"iban": "CZ0820100000002502035405", "acct_num": "2502035405", "token_env": "FIO_API_TOKEN_NEW", "primary": True},
+      {"iban": "CZ8520100000002800359168", "acct_num": "2800359168", "token_env": "FIO_API_TOKEN_OLD", "primary": False},
+  ]
+  BANK_ACCOUNT = next(a["iban"] for a in ACCOUNTS if a["primary"])  # QR / template default
+  ```
+  Use the real check-digit IBAN for `2502035405` (the same one baked into Go).
+
+- Resolve tokens at module load time with `os.environ.get(token_env, "")` and
+  stash them on a parallel `LOADED_ACCOUNTS` list (or attach to the dicts) so
+  other modules don't all re-read env.
+
+### 2. `scripts/fio_utils.py`
+
+- [fio_utils.py:106](../../scripts/fio_utils.py#L106) and
+  [fio_utils.py:219](../../scripts/fio_utils.py#L219): drop the hardcoded
+  `"2800359168"` default for `account_id`. Make it a required argument.
+- `fetch_transactions(date_from, date_to, *, account)` — change signature to
+  take one account dict, return that account's transactions. Internally still
+  routes via `FIO_API_TOKEN` if the account dict has a token, otherwise the
+  transparent scraper at
+  [fio_utils.py:105](../../scripts/fio_utils.py#L105).
+- Add `fetch_transactions_all(date_from, date_to, accounts=None)` that loops
+  over `accounts` (default `config.LOADED_ACCOUNTS`), calls the per-account
+  fetch, concatenates results. Logs per-account counts.
+
+### 3. `scripts/sync_fio_to_sheets.py`
+
+- Where it currently calls `fio_utils.fetch_transactions(...)`, switch to
+  `fio_utils.fetch_transactions_all(...)`. The dedup at
+  [sync_fio_to_sheets.py:62](../../scripts/sync_fio_to_sheets.py#L62) and
+  append at
+  [sync_fio_to_sheets.py:248](../../scripts/sync_fio_to_sheets.py#L248) need
+  no changes — same as in Go, the combined list flows through unchanged.
+
+### 4. `app.py` (QR + template defaults)
+
+- `/qr` at [app.py:321](../../app.py#L321) already reads `BANK_ACCOUNT` from
+  config; since the config default now points at the new IBAN, this is a
+  zero-line change in `app.py`.
+- The `BANK_ACCOUNT` passed into templates at
+  [app.py:180](../../app.py#L180), [app.py:204](../../app.py#L204),
+  [app.py:255](../../app.py#L255), [app.py:291](../../app.py#L291) likewise
+  picks up the new default automatically.
+
+### 5. Tests
+
+The Python suite has **no** existing coverage of `fio_utils`,
+`sync_fio_to_sheets`, or `/qr`. Don't add new tests — keep the port minimal
+and rely on the Go test suite + manual verification for correctness.
+
+### 6. Verification (Python)
+
+1. `make test` — existing suite stays green (the config refactor must not
+   break [tests/test_app.py](../../tests/test_app.py)).
+2. `make sync-2026` against the real sheet, dry-run first if the script
+   supports it, then real run — confirm rows from both accounts arrive.
+3. `make web-debug` → open `/qr?amount=700&message=test` → QR payload SPD
+   contains the new IBAN.
+
+---
+
+## Branching
+
+Per `CLAUDE.md`: this is a feature, so `feat/multi-account-bank-sync` off
+`main`. Two MRs:
+
+1. `feat/multi-account-bank-sync-go` — Go change end-to-end.
+2. `feat/multi-account-bank-sync-py` — Python port, opened after (1) is
+   merged.
+
+Each MR opened via `tea pr create`. CHANGELOG.md entry per MR.
+
+## Out of scope
+
+- No sheet schema migration.
+- No change to `sync_id` hash inputs at
+  [domain/synch/synch.go:14](../../go/internal/domain/synch/synch.go#L14) or
+  [sync_fio_to_sheets.py:67](../../scripts/sync_fio_to_sheets.py#L67).
+- No UI surface for switching the QR account per-request (the existing
+  `?account=` query param on `/qr` keeps working as an override).
+- No backfill / dedup pass over historical rows.

go/cmd/fuj/main.go

@@ -88,7 +88,7 @@ func serverCmd(args []string) {
 		fmt.Fprintf(os.Stderr, "fuj server: sheets client for sync: %v\n", err)
 		os.Exit(1)
 	}
-	fioCli := fio.New(cfg.FioAPIToken, config.IBANAccountNum(cfg.BankAccount), nil)
+	fioClients := buildFioClients(cfg)
 
 	actions := web.ActionHandlers{
 		BankSync: func(ctx context.Context, out io.Writer) error {
@@ -97,7 +97,7 @@ func serverCmd(args []string) {
 			to := time.Date(yr, 12, 31, 23, 59, 59, 0, time.UTC)
 
 			fmt.Fprintln(out, "=== Sync Fio Transactions ===")
-			n, err := banksync.SyncToSheets(ctx, config.PaymentsSheetID, fioCli, sheetsCli,
+			n, err := banksync.SyncToSheets(ctx, config.PaymentsSheetID, fioClients, sheetsCli,
 				banksync.SyncOpts{From: from, To: to, Sort: true})
 			if err != nil {
 				return fmt.Errorf("sync: %w", err)
@@ -197,7 +197,7 @@ func syncCmd(args []string) {
 		fmt.Fprintf(os.Stderr, "fuj sync: sheets client: %v\n", err)
 		os.Exit(1)
 	}
-	fioCli := fio.New(cfg.FioAPIToken, config.IBANAccountNum(cfg.BankAccount), nil)
+	fioClients := buildFioClients(cfg)
 
 	opts := banksync.SyncOpts{Days: *days, Sort: *sort, DryRun: *dryRun, PrintFioTable: *printFioTable}
 	if *fromStr != "" && *toStr != "" {
@@ -213,7 +213,7 @@ func syncCmd(args []string) {
 		}
 	}
 
-	n, err := banksync.SyncToSheets(ctx, config.PaymentsSheetID, fioCli, sheetsCli, opts)
+	n, err := banksync.SyncToSheets(ctx, config.PaymentsSheetID, fioClients, sheetsCli, opts)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "fuj sync: %v\n", err)
 		os.Exit(1)
@@ -274,3 +274,13 @@ Commands:
   sync        Sync Fio transactions to payments sheet
   infer       Infer payment details in payments sheet`)
 }
+
+// buildFioClients constructs one fio.Client per configured account.
+// Each client uses the account's token if available, otherwise the transparent-scraper path.
+func buildFioClients(cfg config.Config) []fio.Client {
+	clients := make([]fio.Client, 0, len(cfg.LoadedAccounts))
+	for _, a := range cfg.LoadedAccounts {
+		clients = append(clients, fio.New(a.Token, a.AcctNum, nil))
+	}
+	return clients
+}

go/internal/config/config.go

@@ -7,6 +7,28 @@ import (
 	"time"
 )
 
+// Account describes a Fio bank account.
+type Account struct {
+	IBAN     string // e.g. "CZ0820100000002502035405"
+	AcctNum  string // bare account number, e.g. "2502035405"
+	TokenEnv string // env var name holding the optional Fio API token
+	Primary  bool   // true for the account QR codes default to
+}
+
+// LoadedAccount is an Account with its token resolved from the environment.
+type LoadedAccount struct {
+	Account
+	Token string // value of os.Getenv(Account.TokenEnv); empty → transparent-scraper path
+}
+
+// Accounts is the hardcoded list of Fio bank accounts to sync from.
+// The first entry with Primary=true is used for QR codes.
+// Tokens are loaded at runtime from each account's TokenEnv.
+var Accounts = []Account{
+	{IBAN: "CZ0820100000002502035405", AcctNum: "2502035405", TokenEnv: "FIO_API_TOKEN_NEW", Primary: true},
+	{IBAN: "CZ8520100000002800359168", AcctNum: "2800359168", TokenEnv: "FIO_API_TOKEN_OLD"},
+}
+
 // Google Sheets IDs — change in code if sheets change (not from env).
 const (
 	AttendanceSheetID = "1E2e_gT_K5AwSRCDLDTa2UetZTkHmBOcz0kFbBUNUNBA"
@@ -34,28 +56,36 @@ var CacheSheetMap = map[string]string{
 // Mirrors scripts/config.py.
 type Config struct {
 	CredentialsPath  string
-	BankAccount      string
+	QRAccount        string          // IBAN of the primary account used for QR codes
+	LoadedAccounts   []LoadedAccount // all accounts to sync, tokens resolved from env
 	CacheDir         string
 	CacheTTL         time.Duration
 	CacheAPICheckTTL time.Duration
 	DriveTimeout     time.Duration
 	LogLevel         string
-	FioAPIToken      string
 	ServerAddr       string
 }
 
 // Load reads configuration from the environment, applying defaults that
 // match the Python side.
 func Load() Config {
+	loaded := make([]LoadedAccount, len(Accounts))
+	var qrAccount string
+	for i, a := range Accounts {
+		loaded[i] = LoadedAccount{Account: a, Token: os.Getenv(a.TokenEnv)}
+		if a.Primary {
+			qrAccount = a.IBAN
+		}
+	}
 	return Config{
 		CredentialsPath:  env("CREDENTIALS_PATH", ".secret/fuj-management-bot-credentials.json"),
-		BankAccount:      env("BANK_ACCOUNT", "CZ8520100000002800359168"),
+		QRAccount:        qrAccount,
+		LoadedAccounts:   loaded,
 		CacheDir:         env("CACHE_DIR", "tmp/go"),
 		CacheTTL:         envDuration("CACHE_TTL_SECONDS", 300),
 		CacheAPICheckTTL: envDuration("CACHE_API_CHECK_TTL_SECONDS", 300),
 		DriveTimeout:     envDuration("DRIVE_TIMEOUT_SECONDS", 10),
 		LogLevel:         env("LOG_LEVEL", "INFO"),
-		FioAPIToken:      env("FIO_API_TOKEN", ""),
 		ServerAddr:       env("SERVER_ADDR", ":8080"),
 	}
 }

go/internal/domain/fees/fees.go

@@ -11,7 +11,7 @@ const (
 var AdultFeeMonthlyRate = map[string]int{
 	"2025-09": 750, "2025-10": 750, "2025-11": 750, "2025-12": 750,
 	"2026-01": 750, "2026-02": 750, "2026-03": 350,
-	"2026-04": 700, "2026-05": 700,
+	"2026-04": 700, "2026-05": 450, "2026-06": 600, "2026-07": 600, "2026-08": 600,
 }
 
 // CalculateFee returns the adult fee in CZK for attendanceCount practices in

go/internal/services/banksync/sync.go

@@ -35,13 +35,13 @@ type SyncOpts struct {
 	PrintFioTable bool      // with DryRun: print every fetched Fio txn with NEW/DUP status
 }
 
-// SyncToSheets fetches Fio transactions and appends new ones to the payments sheet.
+// SyncToSheets fetches Fio transactions from all provided clients and appends
-// Returns the number of rows appended.
+// new ones to the payments sheet. Returns the number of rows appended.
 // Ports scripts/sync_fio_to_sheets.py sync_to_sheets.
 func SyncToSheets(
 	ctx context.Context,
 	spreadsheetID string,
-	fioClient fio.Client,
+	fioClients []fio.Client,
 	sh sheetsWriter,
 	opts SyncOpts,
 ) (int, error) {
@@ -84,10 +84,14 @@ func SyncToSheets(
 		from = to.AddDate(0, 0, -days)
 	}
 
-	// 3. Fetch Fio transactions.
+	// 3. Fetch Fio transactions from each account and combine.
-	txns, err := fioClient.FetchTransactions(ctx, from, to)
+	var txns []fio.Transaction
-	if err != nil {
+	for _, client := range fioClients {
-		return 0, fmt.Errorf("sync: fetch fio: %w", err)
+		got, err := client.FetchTransactions(ctx, from, to)
+		if err != nil {
+			return 0, fmt.Errorf("sync: fetch fio: %w", err)
+		}
+		txns = append(txns, got...)
 	}
 	if opts.DryRun {
 		fmt.Printf("Dry run: window %s to %s, fetched %d transaction(s) from Fio\n",

go/internal/services/banksync/sync_test.go

@@ -20,7 +20,7 @@ func TestSyncToSheets_EmptySheet(t *testing.T) {
 	}}
 	fioFake := &fio.Fake{Transactions: testFioTxns}
 
-	n, err := SyncToSheets(context.Background(), "SHEETID", fioFake, sh, SyncOpts{Days: 30})
+	n, err := SyncToSheets(context.Background(), "SHEETID", []fio.Client{fioFake}, sh, SyncOpts{Days: 30})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -51,7 +51,7 @@ func TestSyncToSheets_Dedup(t *testing.T) {
 	}}
 	fioFake := &fio.Fake{Transactions: testFioTxns}
 
-	n, err := SyncToSheets(context.Background(), "SHEETID", fioFake, sh, SyncOpts{Days: 30})
+	n, err := SyncToSheets(context.Background(), "SHEETID", []fio.Client{fioFake}, sh, SyncOpts{Days: 30})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -72,7 +72,7 @@ func TestSyncToSheets_NoNewTxns(t *testing.T) {
 	}}
 	fioFake := &fio.Fake{Transactions: testFioTxns}
 
-	n, err := SyncToSheets(context.Background(), "SHEETID", fioFake, sh, SyncOpts{Days: 30})
+	n, err := SyncToSheets(context.Background(), "SHEETID", []fio.Client{fioFake}, sh, SyncOpts{Days: 30})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -92,7 +92,7 @@ func TestSyncToSheets_MissingHeader(t *testing.T) {
 	}}
 	fioFake := &fio.Fake{Transactions: testFioTxns[:1]}
 
-	n, err := SyncToSheets(context.Background(), "SHEETID", fioFake, sh, SyncOpts{Days: 30})
+	n, err := SyncToSheets(context.Background(), "SHEETID", []fio.Client{fioFake}, sh, SyncOpts{Days: 30})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -105,7 +105,7 @@ func TestSyncToSheets_Sort(t *testing.T) {
 	sh := &sheets.Fake{Values: map[string][][]any{"SHEETID/A1:K": {}}}
 	fioFake := &fio.Fake{Transactions: testFioTxns[:1]}
 
-	_, err := SyncToSheets(context.Background(), "SHEETID", fioFake, sh, SyncOpts{Days: 30, Sort: true})
+	_, err := SyncToSheets(context.Background(), "SHEETID", []fio.Client{fioFake}, sh, SyncOpts{Days: 30, Sort: true})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -118,7 +118,7 @@ func TestSyncToSheets_ExplicitDateWindow(t *testing.T) {
 
 	from := time.Date(2026, 4, 1, 0, 0, 0, 0, time.UTC)
 	to := time.Date(2026, 4, 30, 0, 0, 0, 0, time.UTC)
-	n, err := SyncToSheets(context.Background(), "SHEETID", fioFake, sh, SyncOpts{From: from, To: to})
+	n, err := SyncToSheets(context.Background(), "SHEETID", []fio.Client{fioFake}, sh, SyncOpts{From: from, To: to})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -131,7 +131,7 @@ func TestSyncToSheets_DryRun(t *testing.T) {
 	sh := &sheets.Fake{Values: map[string][][]any{"SHEETID/A1:K": {}}}
 	fioFake := &fio.Fake{Transactions: testFioTxns}
 
-	n, err := SyncToSheets(context.Background(), "SHEETID", fioFake, sh,
+	n, err := SyncToSheets(context.Background(), "SHEETID", []fio.Client{fioFake}, sh,
 		SyncOpts{Days: 30, Sort: true, DryRun: true})
 	if err != nil {
 		t.Fatal(err)
@@ -144,6 +144,40 @@ func TestSyncToSheets_DryRun(t *testing.T) {
 	}
 }
 
+func TestSyncToSheets_MultiAccount(t *testing.T) {
+	txnsA := []fio.Transaction{
+		{Date: "2026-04-10", Amount: 700, Sender: "Alice", Message: "april", VS: "1", BankID: "A1"},
+	}
+	txnsB := []fio.Transaction{
+		{Date: "2026-04-11", Amount: 500, Sender: "Bob", Message: "duben", VS: "2", BankID: "B1"},
+	}
+	// One transaction that duplicates the first one from account A (same sync_id).
+	dupID := syncIDFor(txnsA[0])
+	sh := &sheets.Fake{Values: map[string][][]any{
+		"SHEETID/A1:K": {
+			{"Date", "Amount", "manual fix", "Person", "Purpose", "Inferred Amount", "Sender", "VS", "Message", "Bank ID", "Sync ID"},
+			{"2026-04-10", 700.0, "", "", "", "", "Alice", "1", "april", "A1", dupID},
+		},
+	}}
+	fakeA := &fio.Fake{Transactions: txnsA}
+	fakeB := &fio.Fake{Transactions: txnsB}
+
+	n, err := SyncToSheets(context.Background(), "SHEETID", []fio.Client{fakeA, fakeB}, sh, SyncOpts{Days: 30})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if n != 1 {
+		t.Errorf("want 1 new row (B1 from account B; A1 is duplicate), got %d", n)
+	}
+	if len(sh.Appended) != 1 || len(sh.Appended[0].Rows) != 1 {
+		t.Fatalf("want exactly 1 row appended, got %v", sh.Appended)
+	}
+	row := sh.Appended[0].Rows[0]
+	if row[6] != "Bob" {
+		t.Errorf("expected Bob's row, got sender=%v", row[6])
+	}
+}
+
 // syncIDFor mirrors what SyncToSheets computes for a given fio.Transaction.
 func syncIDFor(tx fio.Transaction) string {
 	currency := tx.Currency

go/internal/web/api/build_adults.go

@@ -138,7 +138,7 @@ func buildAdultsResponse(
 		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,
+		BankAccount:   cfg.QRAccount,
 		CurrentMonth:  currentMonth,
 	}
 }

go/internal/web/api/build_juniors.go

@@ -134,7 +134,7 @@ func buildJuniorsResponse(
 		Unmatched:     unmatched,
 		AttendanceURL: juniorURL,
 		PaymentsURL:   "https://docs.google.com/spreadsheets/d/" + config.PaymentsSheetID + "/edit",
-		BankAccount:   cfg.BankAccount,
+		BankAccount:   cfg.QRAccount,
 		CurrentMonth:  currentMonth,
 	}
 }

go/internal/web/html_handler.go

@@ -126,13 +126,13 @@ func (h *HTMLHandler) ServeQR(w http.ResponseWriter, r *http.Request) {
 	amount := q.Get("amount")
 	message := q.Get("message")
 	if account == "" {
-		account = h.apiHandler.Config.BankAccount
+		account = h.apiHandler.Config.QRAccount
 	}
 	if amount == "" {
 		amount = "0"
 	}
 
-	payload := BuildSPD(account, amount, message, h.apiHandler.Config.BankAccount)
+	payload := BuildSPD(account, amount, message, h.apiHandler.Config.QRAccount)
 	png, err := RenderQRCode(payload)
 	if err != nil {
 		http.Error(w, "qr encode: "+err.Error(), http.StatusInternalServerError)

go/internal/web/html_handler_test.go

@@ -50,7 +50,7 @@ func fixtureHandler(t *testing.T) *api.Handler {
 	t.Helper()
 	return &api.Handler{
 		Sources: fixtureSources{},
-		Config:  config.Config{BankAccount: "CZ0000000000000000000000"},
+		Config:  config.Config{QRAccount: "CZ0000000000000000000000"},
 	}
 }
 

scripts/attendance.py

@@ -21,7 +21,10 @@ ADULT_FEE_MONTHLY_RATE = {
     "2026-02": 750,
     "2026-03": 350,
     "2026-04": 700,
-    "2026-05": 700,
+    "2026-05": 450,
+    "2026-06": 600,
+    "2026-07": 600,
+    "2026-08": 600,
 }
 
 JUNIOR_FEE_DEFAULT = 500  # CZK for 2+ practices

scripts/config.py

@@ -21,8 +21,18 @@ PAYMENTS_SHEET_ID = "1Om0YPoDVCH5cV8BrNz5LG5eR5MMU05ypQC7UMN1xn_Y"
 # Attendance sheet tab GIDs
 JUNIOR_SHEET_GID = "1213318614"
 
-# Bank
+# Bank accounts — hardcoded list mirroring go/internal/config/config.go.
-BANK_ACCOUNT = os.environ.get("BANK_ACCOUNT", "CZ8520100000002800359168")
+# The entry with primary=True is used for QR codes and as the BANK_ACCOUNT default.
+ACCOUNTS = [
+    {"iban": "CZ0820100000002502035405", "acct_num": "2502035405", "token_env": "FIO_API_TOKEN_NEW", "primary": True},
+    {"iban": "CZ8520100000002800359168", "acct_num": "2800359168", "token_env": "FIO_API_TOKEN_OLD", "primary": False},
+]
+# Resolve API tokens from the environment once at import time.
+LOADED_ACCOUNTS = [
+    {**a, "token": os.environ.get(a["token_env"], "")}
+    for a in ACCOUNTS
+]
+BANK_ACCOUNT = next(a["iban"] for a in ACCOUNTS if a["primary"])
 
 # Cache settings
 CACHE_DIR = PROJECT_ROOT / "tmp"

scripts/fio_utils.py

@@ -103,7 +103,7 @@ def parse_czech_date(s: str) -> str | None:
 
 
 def fetch_transactions_transparent(
-    date_from: str, date_to: str, account_id: str = "2800359168"
+    date_from: str, date_to: str, account_id: str
 ) -> list[dict]:
     """Fetch transactions from Fio transparent account HTML page.
 
@@ -206,22 +206,47 @@ def fetch_transactions_api(
     return transactions
 
 
-def fetch_transactions(date_from: str, date_to: str) -> list[dict]:
+def fetch_transactions_for(account: dict, date_from: str, date_to: str) -> list[dict]:
-    """Fetch transactions, using API if token available, else transparent page."""
+    """Fetch transactions for a single loaded account dict (from config.LOADED_ACCOUNTS).
-    token = os.environ.get("FIO_API_TOKEN", "").strip()
+
+    Uses the API path if the account has a token, otherwise the transparent scraper.
+    date_from/date_to: YYYY-MM-DD.
+    """
+    token = (account.get("token") or "").strip()
+    acct_num = account["acct_num"]
     if token:
-        print(f"fio: using authenticated API, window {date_from}..{date_to}", file=sys.stderr)
+        print(f"fio: account {acct_num}: using authenticated API, window {date_from}..{date_to}", file=sys.stderr)
         return fetch_transactions_api(token, date_from, date_to)
 
     print(
-        f"fio: using transparent page (FIO_API_TOKEN unset — expect publishing lag), "
+        f"fio: account {acct_num}: using transparent page (no token — expect publishing lag), "
-        f"window {date_from}..{date_to}, account=2800359168",
+        f"window {date_from}..{date_to}",
         file=sys.stderr,
     )
-    # Convert YYYY-MM-DD to DD.MM.YYYY for the transparent page URL
     from_dt = datetime.strptime(date_from, "%Y-%m-%d")
     to_dt = datetime.strptime(date_to, "%Y-%m-%d")
     return fetch_transactions_transparent(
         from_dt.strftime("%d.%m.%Y"),
         to_dt.strftime("%d.%m.%Y"),
+        account_id=acct_num,
     )
+
+
+def fetch_transactions_all(
+    date_from: str, date_to: str, accounts: list[dict] | None = None
+) -> list[dict]:
+    """Fetch and combine transactions from all configured accounts.
+
+    accounts: list of loaded account dicts (defaults to config.LOADED_ACCOUNTS).
+    Returns a flat list of all transactions across all accounts.
+    """
+    if accounts is None:
+        from config import LOADED_ACCOUNTS
+        accounts = LOADED_ACCOUNTS
+    all_txns: list[dict] = []
+    for account in accounts:
+        txns = fetch_transactions_for(account, date_from, date_to)
+        print(f"fio: account {account['acct_num']}: {len(txns)} transaction(s)", file=sys.stderr)
+        all_txns.extend(txns)
+    print(f"fio: total {len(all_txns)} transaction(s) across {len(accounts)} account(s)", file=sys.stderr)
+    return all_txns

scripts/sync_fio_to_sheets.py

@@ -12,7 +12,7 @@ from google_auth_oauthlib.flow import InstalledAppFlow
 from google.oauth2 import service_account
 from googleapiclient.discovery import build
 
-from fio_utils import fetch_transactions
+from fio_utils import fetch_transactions_all
 
 from config import PAYMENTS_SHEET_ID as DEFAULT_SPREADSHEET_ID
 SCOPES = ["https://www.googleapis.com/auth/spreadsheets"]
@@ -188,7 +188,7 @@ def sync_to_sheets(
         dt_str = date_to.strftime("%Y-%m-%d")
 
     print(f"Fetching Fio transactions from {df_str} to {dt_str}...")
-    transactions = fetch_transactions(df_str, dt_str)
+    transactions = fetch_transactions_all(df_str, dt_str)
     print(f"Found {len(transactions)} transactions.")
 
     if dry_run: