Make "Floodgate" nullable in StoredProfile

The Floodgate field is null in the database, if the player has not been migrated to the new database format.
It's a bit cleaner this way than storing the isFloodgateMigrated in a separate field in StoredProfile. One less variable in the already crowded constructor.
While this is not memory efficient, this is only temporary, as per TuxCoding#709 (comment) (last sentence).

Author: Smart123s

core/src/main/java/com/github/games647/fastlogin/core/StoredProfile.java

@@ -39,11 +39,11 @@ public class StoredProfile extends Profile {
     private final ReentrantLock saveLock = new ReentrantLock();
 
     private boolean premium;
-    private boolean floodgate;
+    private Boolean floodgate;
     private String lastIp;
     private Instant lastLogin;
 
-    public StoredProfile(long rowId, UUID uuid, String playerName, boolean premium, boolean floodgate, String lastIp,
+    public StoredProfile(long rowId, UUID uuid, String playerName, boolean premium, Boolean floodgate, String lastIp,
             Instant lastLogin) {
         super(uuid, playerName);
 
@@ -108,6 +108,10 @@ public synchronized boolean isFloodgate() {
         return floodgate;
     }
 
+    public synchronized boolean isFloodgateMigrated() {
+        return floodgate != null;
+    }
+
     public synchronized void setFloodgate(boolean floodgate) {
         this.floodgate = floodgate;
     }

core/src/main/java/com/github/games647/fastlogin/core/storage/SQLStorage.java

@@ -143,7 +143,11 @@ private Optional<StoredProfile> parseResult(ResultSet resultSet) throws SQLExcep
 
             String name = resultSet.getString("Name");
             boolean premium = resultSet.getBoolean("Premium");
-            boolean floodgate = resultSet.getBoolean("Floodgate");
+            Boolean floodgate = resultSet.getBoolean("Floodgate");
+            // if the player wasn't migrated to the new database format
+            if (resultSet.wasNull()) {
+                floodgate = null;
+            }
             String lastIp = resultSet.getString("LastIp");
             Instant lastLogin = resultSet.getTimestamp("LastLogin").toInstant();
             return Optional.of(new StoredProfile(userId, uuid, name, premium, floodgate, lastIp, lastLogin));