bc6488f063
- Replace Create+Get+Update with UpsertGame/UpsertSnakeGame queries - Extract free functions (saveGame, loadGame, etc.) from duplicated receiver methods on Store and Instance types - Remove duplicate generateID from snake package, reuse game.GenerateID - Throttle snake game DB writes to every 2s instead of every tick - Fix double-lock in c4game chat handler - Update all code for sqlc pointer types (*string instead of sql.NullString)