feat(infer): messages starting with "other:" are not monthly fees

When the bank message starts with "other:" (case-insensitive), inference does not look for a month, neither in the text nor from the payment date. The trimmed message is written to Purpose, so reconcile books the payment as an "other" transaction for the person instead of a monthly fee. Messages containing "other:" elsewhere are unchanged. - matching.IsOtherPurpose / is_other_purpose shared by inference and reconcile - reconcile applies the rule to rows not yet processed by inference - no person found: Purpose is still written, row shows as unmatched - implemented in Go and legacy Python; four new parity fixtures Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
fix(go): show "Expected: ?" in junior tooltip for unknown fees
2026-10-08 12:37:03 +02:00 · 2026-10-08 12:37:03 +02:00
16 changed files with 573 additions and 11 deletions
@@ -1,5 +1,14 @@
 # Changelog

+## 2026-10-08 12:37 CEST — feat(infer): messages starting with "other:" are not monthly fees
+
+- When the bank message starts with `other:` (case-insensitive), inference no longer looks for a month. It copies the trimmed message into Purpose, so the payment is linked to the person as an "other" transaction and not counted as a monthly fee. Messages that contain `other:` elsewhere are inferred as before.
+- If no person is found, Purpose is still written and the row shows under unmatched for a manual fix.
+- Reconcile applies the same rule to rows not yet processed by inference.
+- Existing rows are not re-inferred; clear Person and Purpose on a row to reprocess it.
+- Go and Python: `matching.IsOtherPurpose` / `is_other_purpose`, `InferTransactionDetails` / `infer_transaction_details`, reconcile fallback; four new parity fixtures.
+- Also fixed (Go): junior cell tooltip showed `Expected: 0` instead of `Expected: ?` when a month with unknown expected fee had a payment.
+
 ## 2026-10-08 12:16 CEST — feat(go): scheduled bank sync (Go only)

 - The Go server now runs the bank sync (sync → infer → flush cache) by itself at the times in `SYNC_SCHEDULE` (comma-separated `HH:MM`, default `04:00`, `off` disables), read in `SYNC_TZ` (default `Europe/Prague`). Nothing runs at startup; an invalid value stops the server at startup with an error.
@@ -164,6 +164,8 @@ Both implementations check the Drive API `modifiedTime` and serve a cached JSON

 `Person` and `Purpose` are written by the inference step (`fuj infer` / `infer_payments.py`) and can be manually corrected. `manual fix` column presence disables re-inference for that row. Multiple people or months are comma-separated in Person/Purpose.

+**Non-fee payments ("other")**: a Purpose that starts with `other:` (case-insensitive) is attached to the person's "other transactions" and is not counted against any month. Inference produces this by itself when the bank message starts with `other:`: it copies the trimmed message into Purpose and does not look for a month (neither in the text nor from the date). A message that only contains `other:` later in the text is inferred the normal way. The shared check is `matching.IsOtherPurpose` / `is_other_purpose`.
+
 ### QR codes

 `/qr?account=…&amount=…&message=…` generates a Czech QR Platba PNG (SPD format).
@@ -0,0 +1,109 @@
+# Inference: messages starting with "other:" are not monthly fees
+
+## Context
+
+Some payments are not monthly fees (tournament fees, jerseys, …). Reconcile
+already supports them: a row whose **Purpose** starts with `other:` is attached
+to the person's "other transactions" and is not counted against any month.
+Today that only happens when someone types the purpose by hand, because
+inference always tries to find a month — from the message, or failing that
+from the payment date.
+
+New rule: when the bank message for the recipient **starts with `other:`**,
+inference must not look for a month. It copies the message into Purpose, so
+the payment is linked to the person but not counted as a monthly fee. Messages
+that merely contain `other:` somewhere else are handled the old way.
+
+Implemented in both Go and legacy Python (this is inference behaviour, so the
+dual implementation rule applies).
+
+## Behaviour
+
+- Trigger: message, after trimming whitespace, starts with `other:`
+  (case-insensitive, same test reconcile already uses for Purpose).
+- Purpose written to the sheet: the trimmed message, unchanged
+  (e.g. `other: turnaj Praha`). No month parsing, no date fallback.
+- Person: inferred exactly as today (sender + message + VS, then sender
+  alone), including the `[?]` review marker.
+- Inferred Amount: the full amount, as today.
+- No person found: Purpose is still written, Person stays empty. The row then
+  shows up under "unmatched" for a manual fix instead of being guessed again
+  on every run.
+- Rows not yet processed by inference (Person and Purpose both empty) are
+  inferred on the fly by reconcile; that path follows the same rule, so such a
+  payment is never briefly counted as a monthly fee.
+- Existing rows are untouched: inference only fills rows where manual fix,
+  Person and Purpose are all empty. To reprocess an old row, clear its Person
+  and Purpose cells.
+
+## Implementation
+
+Branch `feat/infer-other-purpose` off `main`; MR via `tea`.
+
+The output shape of the inference function does not change: for an "other"
+message the months list holds the single purpose string. That is the same
+convention reconcile already uses internally (`matchedMonths = [purpose]`),
+and it means the sheet-writing code needs no change in either language.
+
+1. **Shared predicate**
+   - Go: `matching.IsOtherPurpose(s string) bool` in
+     `go/internal/domain/matching/infer.go`
+     (`strings.HasPrefix(strings.ToLower(strings.TrimSpace(s)), "other:")`).
+   - Python: `is_other_purpose(s)` in `legacy/scripts/match_payments.py`.
+   - Replace the two existing inline checks in reconcile with it
+     (`go/internal/domain/reconcile/reconcile.go`, `reconcile()` in
+     `match_payments.py`).
+
+2. **Inference**
+   - Go `matching.InferTransactionDetails` and Python
+     `infer_transaction_details`: after member matching, if the message is an
+     other-purpose, return `months = [trimmed message]` and skip
+     `ParseMonthReferences` and the date fallback. Update the doc comments
+     (months may hold one `other:…` purpose).
+   - `banksync.InferPayments` (`go/internal/services/banksync/infer.go`) and
+     `infer_payments.py`: no logic change — they already join months into
+     Purpose and write the row when either members or months are non-empty.
+
+3. **Reconcile fallback** (rows with empty Person/Purpose)
+   - In the inference-fallback branch of both reconcile implementations: if
+     the inferred months are a single other-purpose, set the row's purpose to
+     it and mark it as other, so it goes to the member's other-transactions
+     ledger instead of the month allocation.
+
+4. **Tests and fixtures**
+   - Seeds in `legacy/scripts/_fixture_seeds.py`, captured with the existing
+     capture/scrub scripts for these two functions only:
+     - `infer_transaction_details`: `other_prefix` (message
+       `other: tournament`, member in sender → that purpose, no month),
+       `other_prefix_uppercase` (`Other: …`), `other_not_at_start`
+       (`leden other: x` → old behaviour, month parsed).
+     - `reconcile`: `11_other_message_fallback` (empty Person/Purpose, message
+       starts with `other:` → lands in `other_transactions`, month stays
+       unpaid).
+   - Go unit tests: `IsOtherPurpose` table; cases in
+     `matching/infer_test.go`; a case in `banksync/infer_test.go` asserting
+     the written row (`Person`, `Purpose = "other: …"`, amount) and one with
+     no matching member; a fallback case in `reconcile/reconcile_test.go`.
+   - Python: cases in `legacy/tests/test_match_payments.py` for
+     `infer_transaction_details` and the reconcile fallback.
+   - Existing fixtures must stay byte-identical apart from the new files.
+
+5. **Docs**
+   - `CLAUDE.md`: add the rule to the payments-sheet / inference description.
+   - `CHANGELOG.md` entry; copy this plan to
+     `docs/plans/2026-10-08-HHMM-infer-other-purpose.md`.
+
+No change to the JSON API, schemas, templates or the sheet layout.
+
+## Verification
+
+1. `make go-test-all` (unit + parity, including the new fixtures) and
+   `make test`.
+2. `git status go/tests/fixtures` shows only the four new fixture files.
+3. Dry run against the live sheet in both implementations
+   (`fuj infer --dry-run`, Python `infer_payments.py --dry-run`): confirm it
+   runs cleanly and proposes nothing unexpected. The live sheet probably has
+   no un-inferred row starting with `other:`, so the new rule itself is
+   proven by the tests rather than by live data.
+4. `make parity` between the two servers (or the two-container run used
+   earlier) still reports 3/3 routes matching.
@@ -3,6 +3,7 @@ package matching
 import (
 	"fmt"
 	"fuj-management/go/internal/domain/czech"
+	"strings"
 	"time"
 )

@@ -17,12 +18,22 @@ type Transaction struct {
 }

 // InferredDetails is the result of InferTransactionDetails.
+// Months holds "YYYY-MM" keys, or exactly one "other:…" purpose when the
+// payment is not a monthly fee (see IsOtherPurpose).
 type InferredDetails struct {
 	Members    []Match
 	Months     []string
 	SearchText string
 }

+// IsOtherPurpose reports whether s marks a payment that is not a monthly fee:
+// it starts with "other:" (case-insensitive, leading whitespace ignored).
+// Used for both the Purpose column and the bank message.
+// Ports legacy/scripts/match_payments.py is_other_purpose.
+func IsOtherPurpose(s string) bool {
+	return strings.HasPrefix(strings.ToLower(strings.TrimSpace(s)), "other:")
+}
+
 // InferTransactionDetails infers which member(s) and month(s) a transaction belongs to.
 //
 // Search text for member matching: sender + message + user_id.
@@ -30,6 +41,10 @@ type InferredDetails struct {
 // Fallback 1: if no members found, retry match on sender alone.
 // Fallback 2: if no months found, derive from tx.Date (Sheets serial or YYYY-MM-DD).
 //
+// A message that starts with "other:" is not a monthly fee: no month is
+// inferred (neither from the text nor from the date) and Months holds the
+// trimmed message as the single purpose.
+//
 // defaultYear seeds czech.ParseMonthReferences (Python defaulted to the current year;
 // callers should pass time.Now().Year() or a fixed year for deterministic tests).
 //
@@ -38,12 +53,20 @@ func InferTransactionDetails(tx Transaction, memberNames []string, defaultYear i
 	searchText := fmt.Sprintf("%s %s %s", tx.Sender, tx.Message, tx.UserID)

 	members := MatchMembers(searchText, memberNames)
-	months := czech.ParseMonthReferences(tx.Message+" "+tx.UserID, defaultYear)
-
 	if len(members) == 0 {
 		members = MatchMembers(tx.Sender, memberNames)
 	}

+	if IsOtherPurpose(tx.Message) {
+		return InferredDetails{
+			Members:    members,
+			Months:     []string{strings.TrimSpace(tx.Message)},
+			SearchText: searchText,
+		}
+	}
+
+	months := czech.ParseMonthReferences(tx.Message+" "+tx.UserID, defaultYear)
+
 	if len(months) == 0 && tx.Date != nil && tx.Date != "" {
 		if ym := inferMonthFromDate(tx.Date); ym != "" {
 			months = []string{ym}
@@ -32,6 +32,74 @@ import (

 var inferMembers = []string{"Tomáš Němeček (Tov)", "Jana Nováková"}

+func TestIsOtherPurpose(t *testing.T) {
+	t.Parallel()
+	cases := map[string]bool{
+		"other: tournament":   true,
+		"other:shirt":         true,
+		"  Other: Tournament": true,
+		"OTHER:x":             true,
+		"leden other: x":      false,
+		"other tournament":    false,
+		"another: x":          false,
+		"2026-01":             false,
+		"":                    false,
+	}
+	for in, want := range cases {
+		if got := IsOtherPurpose(in); got != want {
+			t.Errorf("IsOtherPurpose(%q) = %v, want %v", in, got, want)
+		}
+	}
+}
+
+func TestInferTransactionDetails_OtherMessage(t *testing.T) {
+	t.Parallel()
+	jana := []Match{{Name: "Jana Nováková", Confidence: ConfidenceAuto}}
+	cases := []struct {
+		name        string
+		tx          Transaction
+		wantMembers []Match
+		wantMonths  []string
+	}{
+		{
+			// Month words and the date must both be ignored.
+			name:        "other prefix: message becomes the purpose, no month",
+			tx:          Transaction{Sender: "Jana Novakova", Message: " other: turnaj leden 2026 ", Date: "2026-04-15"},
+			wantMembers: jana,
+			wantMonths:  []string{"other: turnaj leden 2026"},
+		},
+		{
+			name:        "other prefix is case-insensitive and keeps the original text",
+			tx:          Transaction{Sender: "Jana Novakova", Message: "Other: Dres", Date: "2026-04-15"},
+			wantMembers: jana,
+			wantMonths:  []string{"Other: Dres"},
+		},
+		{
+			name:        "other prefix with no known member still yields the purpose",
+			tx:          Transaction{Sender: "Unknown Payer", Message: "other: dres", Date: "2026-04-15"},
+			wantMembers: nil,
+			wantMonths:  []string{"other: dres"},
+		},
+		{
+			name:        "other: not at the start is handled the old way",
+			tx:          Transaction{Sender: "Jana Novakova", Message: "leden other: dres", Date: "2026-04-15"},
+			wantMembers: jana,
+			wantMonths:  []string{"2026-01"},
+		},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			got := InferTransactionDetails(tc.tx, inferMembers, 2026)
+			if len(got.Members) != len(tc.wantMembers) || (len(got.Members) > 0 && !reflect.DeepEqual(got.Members, tc.wantMembers)) {
+				t.Errorf("Members = %v, want %v", got.Members, tc.wantMembers)
+			}
+			if !reflect.DeepEqual(got.Months, tc.wantMonths) {
+				t.Errorf("Months = %v, want %v", got.Months, tc.wantMonths)
+			}
+		})
+	}
+}
+
 func TestInferTransactionDetails(t *testing.T) {
 	t.Parallel()

@@ -203,7 +203,7 @@ func Reconcile(
 		personStr := strings.TrimSpace(tx.Person)
 		purposeStr := strings.TrimSpace(tx.Purpose)
 		personStr = questionMarkRe.ReplaceAllString(personStr, "")
-		isOther := strings.HasPrefix(strings.ToLower(purposeStr), "other:")
+		isOther := matching.IsOtherPurpose(purposeStr)

 		var matchedMembers []matching.Match
 		var matchedMonths []string
@@ -249,6 +249,11 @@ func Reconcile(
 			matchedMembers = inferred.Members
 			matchedMonths = inferred.Months
 			amount = tx.Amount
+			// A message starting with "other:" is inferred as a non-fee payment.
+			if len(matchedMonths) == 1 && matching.IsOtherPurpose(matchedMonths[0]) {
+				isOther = true
+				purposeStr = matchedMonths[0]
+			}
 		}

 		if len(matchedMembers) == 0 || len(matchedMonths) == 0 {
@@ -257,6 +257,33 @@ func TestReconcileQuestionMarkMarkerStripped(t *testing.T) {
 }

 // [Go] Purpose "other:shirt" puts payment in OtherTransactions, not in month ledger.
+// A row not yet processed by inference (empty Person/Purpose) whose message
+// starts with "other:" must land in the other ledger, not in a month.
+func TestReconcileOtherMessageFallback(t *testing.T) {
+	t.Parallel()
+	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}}}}
+	txs := []Transaction{{
+		Date: "2026-01-10", Amount: 300,
+		Sender: "Alice", Message: "other: shirt",
+	}}
+
+	result := Reconcile(members, []string{"2026-01"}, txs, nil, 2026)
+
+	alice := result.Members["Alice"]
+	if paid := alice.Months["2026-01"].Paid; paid != 0 {
+		t.Errorf("2026-01 paid = %v, want 0", paid)
+	}
+	if len(alice.OtherTransactions) != 1 {
+		t.Fatalf("other transactions = %d, want 1", len(alice.OtherTransactions))
+	}
+	if got := alice.OtherTransactions[0]; got.Amount != 300 || got.Purpose != "other: shirt" {
+		t.Errorf("other entry = %+v", got)
+	}
+	if len(result.Unmatched) != 0 {
+		t.Errorf("unmatched = %d, want 0", len(result.Unmatched))
+	}
+}
+
 func TestReconcileOtherPurpose(t *testing.T) {
 	t.Parallel()
 	members := []Member{{Name: "Alice", Tier: "A", Fees: map[string]FeeData{"2026-01": {Expected: 750, Attendance: 3}}}}
@@ -53,6 +53,42 @@ func TestInferPayments_BasicMatch(t *testing.T) {
 	}
 }

+func TestInferPayments_OtherMessage(t *testing.T) {
+	sh := &sheets.Fake{Values: map[string][][]any{
+		"SHEETID/A1:Z": {
+			paymentsHeader,
+			// Known member: Person filled, message copied to Purpose, no month.
+			{"2026-04-10", 300.0, "", "", "", "", "Jana Novakova", "", "other: dres", "", ""},
+			// Unknown sender: Purpose is still written, Person stays empty.
+			{"2026-04-11", 500.0, "", "", "", "", "Unknown Payer", "", "Other: turnaj", "", ""},
+		},
+	}}
+	att := &fakeAttendance{
+		adults: []reconcile.Member{{Name: "Jana Novakova", Tier: "A"}},
+	}
+
+	n, err := InferPayments(context.Background(), "SHEETID", sh, att, InferOpts{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if n != 2 {
+		t.Fatalf("want 2 rows updated, got %d", n)
+	}
+	updates := sh.BatchUpdated[0].Updates
+	want := [][]any{
+		{"Jana Novakova", "other: dres", "300"},
+		{"", "Other: turnaj", "500"},
+	}
+	for i, w := range want {
+		got := updates[i].Values[0]
+		for j := range w {
+			if got[j] != w[j] {
+				t.Errorf("row %d col %d: want %q, got %q", i, j, w[j], got[j])
+			}
+		}
+	}
+}
+
 func TestInferPayments_SkipRule_ManualFix(t *testing.T) {
 	sh := &sheets.Fake{Values: map[string][][]any{
 		"SHEETID/A1:Z": {
@@ -242,7 +242,12 @@ func buildJuniorMemberRow(

 		tooltip := ""
 		if (!md.IsUnknown && md.Expected > 0) || paid > 0 {
-			tooltip = fmt.Sprintf("Received: %d, Expected: %d", paid, md.Expected)
+			// Unknown expected (one session, manual review) shows as "?", as in Python.
+			expectedText := strconv.Itoa(md.Expected)
+			if md.IsUnknown {
+				expectedText = "?"
+			}
+			tooltip = fmt.Sprintf("Received: %d, Expected: %s", paid, expectedText)
 		}

 		row.Months = append(row.Months, MonthCell{
@@ -0,0 +1,36 @@
+{
+  "case": "other_not_at_start",
+  "func": "scripts.match_payments.infer_transaction_details",
+  "captured_at": "2026-10-08",
+  "input": {
+    "tx": {
+      "sender": "Jana Novakova",
+      "message": "leden other: dres",
+      "user_id": "",
+      "date": {
+        "type": "string",
+        "value": "2026-04-15"
+      }
+    },
+    "member_names": [
+      "Alžběta Testovická",
+      "Tomáš Fiktivný (Tov)",
+      "Pavel Smutný (Štrúdl)",
+      "Jana Nováková",
+      "Adam Novák"
+    ],
+    "default_year": 2026
+  },
+  "output": {
+    "matches": [
+      {
+        "name": "Jana Nováková",
+        "confidence": "auto"
+      }
+    ],
+    "months": [
+      "2026-01"
+    ],
+    "search_text": "Jana Novakova leden other: dres "
+  }
+}
@@ -0,0 +1,36 @@
+{
+  "case": "other_prefix",
+  "func": "scripts.match_payments.infer_transaction_details",
+  "captured_at": "2026-10-08",
+  "input": {
+    "tx": {
+      "sender": "Jana Novakova",
+      "message": "other: tournament leden 2026",
+      "user_id": "",
+      "date": {
+        "type": "string",
+        "value": "2026-04-15"
+      }
+    },
+    "member_names": [
+      "Alžběta Testovická",
+      "Tomáš Fiktivný (Tov)",
+      "Pavel Smutný (Štrúdl)",
+      "Jana Nováková",
+      "Adam Novák"
+    ],
+    "default_year": 2026
+  },
+  "output": {
+    "matches": [
+      {
+        "name": "Jana Nováková",
+        "confidence": "auto"
+      }
+    ],
+    "months": [
+      "other: tournament leden 2026"
+    ],
+    "search_text": "Jana Novakova other: tournament leden 2026 "
+  }
+}
@@ -0,0 +1,31 @@
+{
+  "case": "other_prefix_uppercase",
+  "func": "scripts.match_payments.infer_transaction_details",
+  "captured_at": "2026-10-08",
+  "input": {
+    "tx": {
+      "sender": "Test Payer",
+      "message": " Other: Dres ",
+      "user_id": "",
+      "date": {
+        "type": "string",
+        "value": "2026-04-15"
+      }
+    },
+    "member_names": [
+      "Alžběta Testovická",
+      "Tomáš Fiktivný (Tov)",
+      "Pavel Smutný (Štrúdl)",
+      "Jana Nováková",
+      "Adam Novák"
+    ],
+    "default_year": 2026
+  },
+  "output": {
+    "matches": [],
+    "months": [
+      "Other: Dres"
+    ],
+    "search_text": "Test Payer  Other: Dres  "
+  }
+}
@@ -0,0 +1,69 @@
+{
+  "case": "11_other_message_fallback",
+  "func": "scripts.match_payments.reconcile",
+  "captured_at": "2026-10-08",
+  "input": {
+    "members": [
+      {
+        "name": "Member_d035d9f9",
+        "tier": "A",
+        "fees": {
+          "2026-01": [
+            750,
+            3
+          ]
+        }
+      }
+    ],
+    "sorted_months": [
+      "2026-01"
+    ],
+    "transactions": [
+      {
+        "date": "2026-01-10",
+        "amount": 300,
+        "manual_fix": "",
+        "person": "",
+        "purpose": "",
+        "inferred_amount": 300,
+        "sender": "Member_d035d9f9",
+        "message": "other: tournament",
+        "bank_id": ""
+      }
+    ],
+    "exceptions": [],
+    "default_year": 2026
+  },
+  "output": {
+    "members": {
+      "Member_d035d9f9": {
+        "tier": "A",
+        "months": {
+          "2026-01": {
+            "expected": 750,
+            "original_expected": 750,
+            "attendance_count": 3,
+            "exception": null,
+            "paid": 0.0,
+            "transactions": []
+          }
+        },
+        "other_transactions": [
+          {
+            "amount": 300.0,
+            "date": "2026-01-10",
+            "sender": "Member_d035d9f9",
+            "message": "other: tournament",
+            "purpose": "other: tournament",
+            "confidence": "auto"
+          }
+        ],
+        "total_balance": -750
+      }
+    },
+    "unmatched": [],
+    "credits": {
+      "Member_d035d9f9": -750
+    }
+  }
+}
@@ -358,6 +358,36 @@ SEEDS[("infer_transaction_details", "serial_date")] = {
    "member_names": _ROSTER,
    "default_year": 2026,
 }
+SEEDS[("infer_transaction_details", "other_prefix")] = {
+    "tx": {
+        "sender": "Jana Novakova",
+        "message": "other: tournament leden 2026",
+        "user_id": "",
+        "date": {"type": "string", "value": "2026-04-15"},
+    },
+    "member_names": _ROSTER,
+    "default_year": 2026,
+}
+SEEDS[("infer_transaction_details", "other_prefix_uppercase")] = {
+    "tx": {
+        "sender": "Test Payer",
+        "message": " Other: Dres ",
+        "user_id": "",
+        "date": {"type": "string", "value": "2026-04-15"},
+    },
+    "member_names": _ROSTER,
+    "default_year": 2026,
+}
+SEEDS[("infer_transaction_details", "other_not_at_start")] = {
+    "tx": {
+        "sender": "Jana Novakova",
+        "message": "leden other: dres",
+        "user_id": "",
+        "date": {"type": "string", "value": "2026-04-15"},
+    },
+    "member_names": _ROSTER,
+    "default_year": 2026,
+}
 SEEDS[("infer_transaction_details", "no_member_no_month")] = {
    "tx": {
        "sender": "Unknown Person",
@@ -476,6 +506,14 @@ SEEDS[("reconcile", "07_other_purpose_split")] = _reconcile_seed(
    transactions=[_tx("2026-01-10", 800, "Alice Dvořák, Bob Kratochvíl", "other:tournament", sender="Alice Dvořák")],
 )

+# 11 — message starts with "other:" on a row not yet inferred (empty Person/Purpose):
+# goes to the other ledger, the month stays unpaid
+SEEDS[("reconcile", "11_other_message_fallback")] = _reconcile_seed(
+    members=[_member("Alice Dvořák", "A", {"2026-01": (750, 3)})],
+    sorted_months=["2026-01"],
+    transactions=[_tx("2026-01-10", 300, "", "", sender="Alice Dvořák", message="other: tournament")],
+)
+
 # 08 — junior with attendance=1 (expected=0 in reconcile, unknown in UI)
 SEEDS[("reconcile", "08_junior_question_mark")] = _reconcile_seed(
    members=[_member("Karel Junior", "A", {"2026-01": (0, 1)})],
@@ -150,27 +150,48 @@ def match_members(
 # Reconciliation
 # ---------------------------------------------------------------------------

+def is_other_purpose(text) -> bool:
+    """True when text marks a payment that is not a monthly fee.
+
+    It starts with "other:" (case-insensitive, leading whitespace ignored).
+    Used for both the Purpose column and the bank message.
+    """
+    return str(text or "").strip().lower().startswith("other:")
+
+
 def infer_transaction_details(tx: dict, member_names: list[str]) -> dict:
    """Infer member(s) and month(s) for a single transaction.
-    
+
+    A message that starts with "other:" is not a monthly fee: no month is
+    inferred (neither from the text nor from the date) and 'months' holds the
+    trimmed message as the single purpose.
+
    Returns:
        {
            'members': [(name, confidence)],
-            'months': [YYYY-MM],
+            'months': [YYYY-MM] or ['other:…'],
            'matched_text': str
        }
    """
    # Combine sender + message for searching
    search_text = f"{tx.get('sender', '')} {tx.get('message', '')} {tx.get('user_id', '')}"
    matched_members = match_members(search_text, member_names)
-    matched_months = parse_month_references(
-        tx.get("message", "") + " " + tx.get("user_id", "")
-    )

    if not matched_members:
        # Try matching sender name alone with more lenient matching
        matched_members = match_members(tx.get("sender", ""), member_names)

+    if is_other_purpose(tx.get("message", "")):
+        return {
+            "members": matched_members,
+            "months": [str(tx.get("message", "")).strip()],
+            "search_text": search_text
+        }
+
+    matched_months = parse_month_references(
+        tx.get("message", "") + " " + tx.get("user_id", "")
+    )
+
    if not matched_months:
        # If no month specified, try to infer from payment date
        tx_date = tx.get("date")
@@ -394,7 +415,7 @@ def reconcile(
        
        # Strip markers like [?]
        person_str = re.sub(r"\[\?\]\s*", "", person_str)
-        is_other = purpose_str.lower().startswith("other:")
+        is_other = is_other_purpose(purpose_str)

        if person_str and purpose_str:
            # We have pre-matched data (either from script or manual)
@@ -415,6 +436,10 @@ def reconcile(
            inference = infer_transaction_details(tx, member_names)
            matched_members = inference["members"]
            matched_months = inference["months"]
+            # A message starting with "other:" is inferred as a non-fee payment.
+            if len(matched_months) == 1 and is_other_purpose(matched_months[0]):
+                is_other = True
+                purpose_str = matched_months[0]
            amount = tx.get("amount", 0)
            try:
                amount = float(amount)
@@ -1,7 +1,9 @@
 import unittest
 from unittest.mock import MagicMock, patch

-from scripts.match_payments import canonical_member_key, fetch_sheet_data, reconcile
+from scripts.match_payments import (
+    canonical_member_key, fetch_sheet_data, infer_transaction_details, is_other_purpose, reconcile,
+)


 class TestCanonicalMemberKey(unittest.TestCase):
@@ -88,3 +90,44 @@ class TestFetchSheetDataVS(unittest.TestCase):

    def test_string_vs_is_kept(self):
        self.assertEqual(self._fetch("0308")[0]["vs"], "0308")
+
+
+class TestOtherPurposeInference(unittest.TestCase):
+    """A message starting with "other:" is not a monthly fee."""
+
+    MEMBERS = ["Jana Nováková", "Adam Novák"]
+
+    def test_is_other_purpose(self):
+        for text in ("other: tournament", "other:shirt", "  Other: Tournament", "OTHER:x"):
+            self.assertTrue(is_other_purpose(text), text)
+        for text in ("leden other: x", "other tournament", "another: x", "2026-01", "", None):
+            self.assertFalse(is_other_purpose(text), text)
+
+    def test_message_becomes_purpose_and_no_month_is_inferred(self):
+        tx = {"sender": "Jana Novakova", "message": " other: turnaj leden 2026 ", "date": "2026-04-15"}
+        result = infer_transaction_details(tx, self.MEMBERS)
+        self.assertEqual(result["members"], [("Jana Nováková", "auto")])
+        self.assertEqual(result["months"], ["other: turnaj leden 2026"])
+
+    def test_unknown_member_still_yields_purpose(self):
+        tx = {"sender": "Unknown Payer", "message": "Other: Dres", "date": "2026-04-15"}
+        result = infer_transaction_details(tx, self.MEMBERS)
+        self.assertEqual(result["members"], [])
+        self.assertEqual(result["months"], ["Other: Dres"])
+
+    def test_other_not_at_start_is_handled_the_old_way(self):
+        tx = {"sender": "Jana Novakova", "message": "leden other: dres", "date": "2026-04-15"}
+        result = infer_transaction_details(tx, self.MEMBERS)
+        self.assertEqual(result["months"], ["2026-01"])
+
+    def test_reconcile_fallback_puts_it_in_other_ledger(self):
+        members = [("Jana Nováková", "A", {"2026-01": (750, 3)})]
+        tx = {"date": "2026-01-10", "amount": 300, "person": "", "purpose": "",
+              "sender": "Jana Novakova", "message": "other: dres", "inferred_amount": ""}
+        result = reconcile(members, ["2026-01"], [tx], {})
+        member = result["members"]["Jana Nováková"]
+        self.assertEqual(member["months"]["2026-01"]["paid"], 0)
+        self.assertEqual(len(member["other_transactions"]), 1)
+        self.assertEqual(member["other_transactions"][0]["amount"], 300)
+        self.assertEqual(member["other_transactions"][0]["purpose"], "other: dres")
+        self.assertEqual(result["unmatched"], [])