refactor: add save()/savePlayer() methods on game instances

Wrap free persistence functions in instance methods for cleaner call
sites (gi.save() instead of saveGame(gi.queries, gi.game)). Methods
log errors via zerolog before returning them.

snake/persist.go

@@ -4,8 +4,26 @@ import (
 	"context"
 
 	"github.com/ryanhamamura/c4/db/repository"
+
+	"github.com/rs/zerolog/log"
 )
 
+func (si *SnakeGameInstance) save() error {
+	err := saveSnakeGame(si.queries, si.game)
+	if err != nil {
+		log.Error().Err(err).Str("game_id", si.game.ID).Msg("failed to save snake game")
+	}
+	return err
+}
+
+func (si *SnakeGameInstance) savePlayer(player *Player) error {
+	err := saveSnakePlayer(si.queries, si.game.ID, player)
+	if err != nil {
+		log.Error().Err(err).Str("game_id", si.game.ID).Msg("failed to save snake player")
+	}
+	return err
+}
+
 // saveSnakeGame persists the snake game state via upsert.
 func saveSnakeGame(queries *repository.Queries, sg *SnakeGame) error {
 	boardJSON := "{}"