refactor: split casino.go, dedup helpers, remove audit docs

1 files changed, 8 insertions, 1 deletions

diff --git a/internal/net/server.go b/internal/net/server.go
index 0854426..d1a0492 100644
--- a/internal/net/server.go
+++ b/internal/net/server.go
@@ -570,7 +570,14 @@ func (h *Hub) RekeyRooms(idMap map[int]int) {
 	moved := make(map[int]map[*Session]bool, len(h.rooms))
 	for id, set := range h.rooms {
 		if newID, ok := idMap[id]; ok && newID != id {
-			moved[newID] = set
+			if moved[newID] == nil {
+				moved[newID] = make(map[*Session]bool)
+			}
+			// Merge rather than assign: a many-to-one idMap (A->C, B->C)
+			// would otherwise clobber the first source bucket's sessions.
+			for s := range set {
+				moved[newID][s] = true
+			}
 			delete(h.rooms, id)
 		}
 	}