GiveBadge could treat a missing offline user as eligible for a badge and insert through a nullable user subquery. Depending on SQL mode this could fail late or persist an orphaned user_id value. Resolve the offline user first, return HABBO_NOT_FOUND when absent, and insert badges with the resolved user id only.
SetMotto updated the in-memory motto and then unconditionally broadcast RoomUserData through the current room. Online users without a current room could throw a null-pointer exception after the state change, making the RCON call report an error despite mutating the user. Only broadcast room data when a room is present and cover the invariant with a contract test.
GiveRespect inverted the offline SQL parameters for respects_given and respects_received. Online users received the intended counters, but offline users had the two persisted counters swapped. Bind respect_given to respects_given and respect_received to respects_received, with a contract test to keep the RCON offline path aligned.
GiveCredits treated offline UPDATE execution as success without checking whether any user row was changed. Nonexistent user ids could therefore return an offline success response while granting nothing. Use executeUpdate(), return HABBO_NOT_FOUND when no row is affected, and keep SQL errors from falling through to the offline success message.
RCONServerHandler released the inbound ByteBuf only after successfully parsing, writing, flushing, and closing the response. Any exception before the tail release could leak Netty buffers and let malformed RCON traffic consume memory over time. Guard non-ByteBuf messages, release accepted buffers from a finally block, and add a contract test for the release invariant.
RCON GivePixels previously used an UPDATE for offline users, so users without an existing users_currency type 0 row received no pixels while the command still returned success. Match the GivePoints and housekeeping paths with an upsert and add a contract test that keeps offline pixel grants creating missing currency rows.
simoleo89