almost there

src/main/java/mc/unraveled/reforged/data/LoginManager.java

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+package mc.unraveled.reforged.data;
+
+import lombok.Getter;
+import mc.unraveled.reforged.api.Baker;
+import mc.unraveled.reforged.listening.AbstractListener;
+import mc.unraveled.reforged.plugin.Traverse;
+import mc.unraveled.reforged.storage.DBUser;
+import mc.unraveled.reforged.util.Pair;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerLoginEvent;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@Getter
+public class LoginManager implements Baker {
+    private final Traverse plugin;
+    private Set<Pair<Player, CustomLoginData>> dataSet = new HashSet<>(); // VALUE ONLY MODIFIED BY BAKER
+    private boolean baked = false;
+
+    public LoginManager(Traverse plugin) {
+        this.plugin = plugin;
+
+        new LoginListener(plugin);
+    }
+
+    public void add(Player player, CustomLoginData data) {
+        dataSet.add(new Pair<>(player, data));
+    }
+
+    public void remove(Player player) {
+        dataSet.removeIf(pair -> pair.getFirst().equals(player));
+    }
+
+    @Nullable
+    public CustomLoginData get(Player player) {
+        return dataSet.stream()
+                .filter(pair -> pair.getFirst().equals(player))
+                .map(Pair::getSecond)
+                .findFirst()
+                .orElse(null);
+    }
+
+    public void set(Player player, CustomLoginData data) {
+        remove(player);
+        add(player, data);
+    }
+
+    @Override
+    public void bake() {
+        if (baked) return;
+
+        dataSet.forEach(pair -> {
+            Player player = pair.getFirst();
+            CustomLoginData data = pair.getSecond();
+
+            DBUser user = new DBUser(plugin.getSQLManager().establish());
+            user.setLoginMessage(player.getUniqueId().toString(), data.getLoginMessage().toString());
+            user.close();
+        });
+
+        this.dataSet = dataSet.stream().collect(Collectors.toUnmodifiableSet());
+        this.baked = true;
+    }
+
+    @Override
+    public void unbake() {
+        if (!baked) return;
+
+        this.dataSet = new HashSet<>(dataSet);
+        this.baked = false;
+    }
+
+    private final class LoginListener extends AbstractListener {
+        public LoginListener(Traverse plugin) {
+            super(plugin);
+        }
+
+        @EventHandler
+        public void onLogin(PlayerLoginEvent event) {
+            Player player = event.getPlayer();
+        }
+    }
+}