Add WARNING on start-up if repository is missing latest AT state data

src/main/java/org/qortal/block/BlockChain.java

@@ -491,6 +491,8 @@ public class BlockChain {
 			rebuildBlockchain();
 
 		try (final Repository repository = RepositoryManager.getRepository()) {
+			repository.checkConsistency();
+
 			int startHeight = Math.max(repository.getBlockRepository().getBlockchainHeight() - 1440, 1);
 
 			BlockData detachedBlockData = repository.getBlockRepository().getDetachedBlockSignature(startHeight);

src/main/java/org/qortal/repository/ATRepository.java

@@ -148,4 +148,8 @@ public interface ATRepository {
 	 */
 	public NextTransactionInfo findNextTransaction(String recipient, int height, int sequence) throws DataException;
 
+	// Other
+
+	public void checkConsistency() throws DataException;
+
 }

src/main/java/org/qortal/repository/Repository.java

@@ -55,4 +55,6 @@ public interface Repository extends AutoCloseable {
 
 	public void importDataFromFile(String filename) throws DataException;
 
+	public void checkConsistency() throws DataException;
+
 }

src/main/java/org/qortal/repository/hsqldb/HSQLDBATRepository.java

@@ -5,6 +5,8 @@ import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.qortal.data.at.ATData;
 import org.qortal.data.at.ATStateData;
 import org.qortal.repository.ATRepository;
@@ -14,6 +16,8 @@ import com.google.common.primitives.Longs;
 
 public class HSQLDBATRepository implements ATRepository {
 
+	private static final Logger LOGGER = LogManager.getLogger(HSQLDBATRepository.class);
+
 	protected HSQLDBRepository repository;
 
 	public HSQLDBATRepository(HSQLDBRepository repository) {
@@ -577,7 +581,35 @@ public class HSQLDBATRepository implements ATRepository {
 		} catch (SQLException e) {
 			throw new DataException("Unable to find next transaction to AT from repository", e);
 		}
+	}
 
+	// Other
+
+	public void checkConsistency() throws DataException {
+		String sql = "SELECT COUNT(*) FROM ATs "
+				+ "CROSS JOIN LATERAL("
+					+ "SELECT height FROM ATStates "
+					+ "WHERE ATStates.AT_address = ATs.AT_address "
+					+ "ORDER BY AT_address DESC, height DESC "
+					+ "LIMIT 1"
+				+ ") AS LatestATState (height) "
+				+ "LEFT OUTER JOIN ATStatesData "
+				+ "ON ATStatesData.AT_address = ATs.AT_address AND ATStatesData.height = LatestATState.height "
+				+ "WHERE ATStatesData.AT_address IS NULL";
+
+		try (ResultSet resultSet = this.repository.checkedExecute(sql)) {
+			if (resultSet == null)
+				throw new DataException("Unable to check AT repository consistency");
+
+			int atCount = resultSet.getInt(1);
+
+			if (atCount > 0) {
+				LOGGER.warn(() -> String.format("Missing %d latest AT state data row%s!", atCount, (atCount != 1 ? "s" : "")));
+				LOGGER.warn("Export key data then resync using bootstrap as soon as possible");
+			}
+		} catch (SQLException e) {
+			throw new DataException("Unable to check AT repository consistency", e);
+		}
 	}
 
 }

src/main/java/org/qortal/repository/hsqldb/HSQLDBRepository.java

@@ -426,6 +426,11 @@ public class HSQLDBRepository implements Repository {
 		}
 	}
 
+	@Override
+	public void checkConsistency() throws DataException {
+		this.getATRepository().checkConsistency();
+	}
+
 	/** Returns DB pathname from passed connection URL. If memory DB, returns "mem". */
 	/*package*/ static String getDbPathname(String connectionUrl) {
 		Pattern pattern = Pattern.compile("hsqldb:(mem|file):(.*?)(;|$)");