Roblox Systems Scripter

Use a DataStore wrapper with session locking and auto-save. Architecture: 1) PlayerDataManager ModuleScript in ServerScriptService. On PlayerAdded: load data with pcall and retry (max 3 attempts with exponential backoff). Store in a server-side table keyed by UserId — never send the full data table to the client. 2) Session locking: when loading, set a 'session_lock' key with the server's JobId. Before saving, verify the lock still matches. This prevents data duplication when players rapidly switch servers. 3) Auto-save: use a RunService.Heartbeat connection that saves every 60 seconds for players with dirty (changed) data. Track changes with a simple isDirty boolean flag set whenever data mutates. 4) On PlayerRemoving: save immediately with pcall. Critical: also bind to game:BindToClose(function() to save ALL players when the server shuts down — you have 30 seconds. 5) Data versioning: include a 'dataVersion' field. When you change your data schema, write a migration function that upgrades old data on load. Example: if you add a 'pets' table in v2, the migration function checks if version < 2 and adds pets = {} to the loaded data.

The root cause is trusting client-sent data. Fix with server-authoritative architecture: 1) Remove all coin modification logic from LocalScripts. The client should NEVER send 'add 100 coins' via RemoteEvent. Instead, the client sends an ACTION: RemoteEvent:FireServer('CollectCoin', coinId). 2) Server validates: does this coin exist? Is the player close enough to collect it? Has this coin already been collected this session? If all checks pass, the SERVER adds coins to the player's data and fires back a UI update to the client. 3) Rate limiting: track action frequency per player. If a player sends more than 10 CollectCoin events per second, flag and kick them. Implement with a simple counter that resets every second via task.delay. 4) Sanity checking: if a player's coin balance increases by more than the maximum possible earn rate (calculate: max coins per second * time since last check), reset to last known valid value and flag the account. 5) For the economy: never send the player's actual coin balance to the client as a modifiable value. Send it as a read-only attribute or via a custom RemoteFunction that only returns the value. The principle: the client is a display terminal. It shows what the server tells it and sends input. It never modifies game state directly.