smartcontract: add changelog for multicast group code-based PDA

Resolves: #3115

Author: martinsander00

CHANGELOG.md

@@ -15,6 +15,7 @@ All notable changes to this project will be documented in this file.
 - Smartcontract
   - Serviceability: add `Reservation` account and `ReserveConnection`/`CloseReservation` instructions for pre-reserving connection seats on devices, with `reserved_seats` factored into capacity checks on both reservation and user creation
   - Allow sentinel authority to add/remove multicast publisher and subscriber allowlist entries
+  - Multicast group PDA derivation now uses `code` instead of `account_index`, preventing duplicate codes at the PDA level; code-based lookups fall back to `getProgramAccounts` scan for legacy index-based accounts
 - Telemetry
   - Fix global monitor crash when IBRL and multicast users share the same client IP but are on different devices, by preferring non-multicast users in client IP lookups to match status device selection
 - E2E tests

e2e/compatibility_test.go

@@ -57,25 +57,21 @@ type knownIncompat struct {
 }
 
 var knownIncompatibilities = map[string]knownIncompat{
-	// multicast_group_create: The MulticastGroupCreateArgs Borsh struct changed in v0.8.1.
-	// The index and bump_seed fields were removed. Older CLIs send the old format which
-	// causes Borsh deserialization failure in the current program.
-	"write/multicast_group_create": {minVersion: "0.8.1"},
+	// multicast_group_create: v0.9.0 changed PDA derivation from account_index to code.
+	// Older CLIs compute the wrong PDA, causing an assertion failure in the onchain program.
+	"write/multicast_group_create": {minVersion: "0.9.0"},
 
 	// All multicast operations that depend on multicast_group_create. When the group
-	// can't be created (< 0.8.1), these all fail with "MulticastGroup not found".
-	"write/multicast_group_wait_activated": {minVersion: "0.8.1"},
-	// multicast_group_update: In addition to the dependency above, v0.8.1-v0.8.8 parsed
-	// --max-bandwidth as a plain integer. v0.8.9 added validate_parse_bandwidth (a855ca7a)
-	// which accepts unit strings like "200Mbps".
-	"write/multicast_group_update":               {minVersion: "0.8.9"},
-	"write/multicast_group_pub_allowlist_add":    {minVersion: "0.8.1"},
-	"write/multicast_group_pub_allowlist_remove": {minVersion: "0.8.1"},
-	"write/multicast_group_sub_allowlist_add":    {minVersion: "0.8.1"},
-	"write/user_subscribe":                       {minVersion: "0.8.1"},
-	"write/multicast_group_sub_allowlist_remove": {minVersion: "0.8.1"},
-	"write/multicast_group_get":                  {minVersion: "0.8.1"},
-	"write/multicast_group_delete":               {minVersion: "0.8.1"},
+	// can't be created (< 0.9.0), these all fail with "MulticastGroup not found".
+	"write/multicast_group_wait_activated":       {minVersion: "0.9.0"},
+	"write/multicast_group_update":               {minVersion: "0.9.0"},
+	"write/multicast_group_pub_allowlist_add":    {minVersion: "0.9.0"},
+	"write/multicast_group_pub_allowlist_remove": {minVersion: "0.9.0"},
+	"write/multicast_group_sub_allowlist_add":    {minVersion: "0.9.0"},
+	"write/user_subscribe":                       {minVersion: "0.9.0"},
+	"write/multicast_group_sub_allowlist_remove": {minVersion: "0.9.0"},
+	"write/multicast_group_get":                  {minVersion: "0.9.0"},
+	"write/multicast_group_delete":               {minVersion: "0.9.0"},
 
 	// set-health commands: The CLI subcommand was added in commit eb7ea308 (Jan 16).
 	// mainnet-beta v0.8.2 was built Jan 13 (before set-health) → doesn't have it.