diff --git a/auth/csvauth/csvauth_test.go b/auth/csvauth/csvauth_test.go
index 360032c..dc5254f 100644
--- a/auth/csvauth/csvauth_test.go
+++ b/auth/csvauth/csvauth_test.go
@@ -23,6 +23,8 @@ func TestCredentialCreationAndVerification(t *testing.T) {
 		{"service2", "acme", []string{"plain"}, nil, "token2", false, true},
 		{"service3", "user3", []string{"pbkdf2", "1000", "16", "SHA-256"}, nil, "token3", false, false},
 		{"service4", "user4", []string{"bcrypt"}, []string{"audit", "triage"}, "token4", false, false},
+		// {"token", "api~vkdAIZ2O", []string{"aes-128-gcm"}, nil, "api1", true, true},
+		// {"token", "api~b5ZF2sRQ", []string{"aes-128-gcm"}, nil, "api2", true, true},
 		{"login", "user1", []string{"pbkdf2", "1000", "16", "SHA-256"}, nil, "pass1", true, false},
 		{"login", "user2", []string{"bcrypt"}, nil, "pass2", true, false},
 		{"login", "user3", []string{"aes-128-gcm"}, nil, "pass3", true, true},
diff --git a/cmd/calendar/main.go b/cmd/calendar/main.go
index 948c1a8..fbd320e 100644
--- a/cmd/calendar/main.go
+++ b/cmd/calendar/main.go
@@ -82,6 +82,43 @@ var FIELDS = Fields{
 	R_LAST:  10,
 }
 
+func GetFieldIndex(header []string, name string) int {
+	name = strings.ToLower(name)
+	for i, h := range header {
+		h = strings.ToLower(h)
+		if strings.EqualFold(strings.TrimSpace(h), name) {
+			return i
+		}
+	}
+	return -1
+}
+
+func GetFieldIndexWithPrefix(header []string, pre string) int {
+	pre = strings.ToLower(pre)
+	for i, h := range header {
+		h = strings.TrimSpace(strings.ToLower(h))
+		if HasPrefixFold(h, pre) {
+			return i
+		}
+	}
+	return -1
+}
+
+func GetFieldLastIndexWithPrefix(header []string, pre string) int {
+	pre = strings.ToLower(pre)
+	for i := len(header) - 1; i >= 0; i-- {
+		h := strings.TrimSpace(strings.ToLower(header[i]))
+		if HasPrefixFold(h, pre) {
+			return i
+		}
+	}
+	return -1
+}
+
+func HasPrefixFold(s, prefix string) bool {
+	return len(s) >= len(prefix) && strings.EqualFold(s[:len(prefix)], prefix)
+}
+
 // ---------- 2. CSV → []Rule ----------
 func LoadRules(csvr *csv.Reader) ([]Rule, error) {
 	// first line is the header