Prevent HSQLDB prepared statement cache invalidation when rebuilding latest AT states cache

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

@@ -428,32 +428,27 @@ public class HSQLDBATRepository implements ATRepository {
 	@Override
 	public void prepareForAtStateTrimming() throws DataException {
 		// Rebuild cache of latest, non-finished AT states that we can't trim
-		String dropSql = "DROP TABLE IF EXISTS LatestATStates";
-
+		String deleteSql = "DELETE FROM LatestATStates";
 		try {
-			this.repository.executeCheckedUpdate(dropSql);
+			this.repository.executeCheckedUpdate(deleteSql);
 		} catch (SQLException e) {
 			repository.examineException(e);
-			throw new DataException("Unable to drop temporary latest AT states cache from repository", e);
+			throw new DataException("Unable to delete temporary latest AT states cache from repository", e);
 		}
 
-		String createSql = "CREATE TEMPORARY TABLE LatestATStates "
-				+ "AS ("
+		String insertSql = "INSERT INTO LatestATStates ("
 				+ "SELECT AT_address, height 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"
 				+ ") "
-				+ ") "
-				+ "WITH DATA "
-				+ "ON COMMIT PRESERVE ROWS";
-
+			+ ")";
 		try {
-			this.repository.executeCheckedUpdate(createSql);
+			this.repository.executeCheckedUpdate(insertSql);
 		} catch (SQLException e) {
 			repository.examineException(e);
-			throw new DataException("Unable to recreate temporary latest AT states cache in repository", e);
+			throw new DataException("Unable to populate temporary latest AT states cache in repository", e);
 		}
 	}
 

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

@@ -677,6 +677,14 @@ public class HSQLDBDatabaseUpdates {
 					stmt.execute("CREATE INDEX IF NOT EXISTS ATTransactionsRecipientIndex ON ATTransactions (recipient)");
 					break;
 
+				case 28:
+					// Latest AT state cache
+					stmt.execute("CREATE TEMPORARY TABLE IF NOT EXISTS LatestATStates ("
+								+ "AT_address QortalAddress NOT NULL, "
+								+ "height INT NOT NULL"
+							+ ")");
+					break;
+
 				default:
 					// nothing to do
 					return false;