Ignore error when removing data that was already removed

Affects issues:
- Fixed #4035

Author: AuroraLS3

Plan/common/src/main/java/com/djrapitops/plan/exceptions/database/DBOpException.java

@@ -31,6 +31,7 @@ public class DBOpException extends IllegalStateException implements ExceptionWit
 
     public static final String CONSTRAINT_VIOLATION = "Constraint Violation";
     public static final String DUPLICATE_KEY = "Duplicate key";
+    public static final String MODIFIED_SINCE_LAST_READ = "Modified since last read";
     private final ErrorContext context;
 
     public DBOpException(String message) {
@@ -147,6 +148,9 @@ public static DBOpException forCause(String sql, SQLException e) {
                 context.related("column byte length exceeded")
                         .whatToDo("Update your MySQL, column key size was exceeded (max key length is 767 bytes in 5.6) - MySQL 5.7 increases the limit.");
                 break;
+            case 1020: // MySQL error 'Record has changed since last read in table'
+                context.related(MODIFIED_SINCE_LAST_READ);
+                break;
             default:
                 context.related("Unknown SQL Error code");
         }
@@ -171,4 +175,9 @@ public boolean isDuplicateKeyViolation() {
         return context != null
                 && context.getRelated().contains(DBOpException.DUPLICATE_KEY);
     }
+
+    public boolean isModifiedSinceLastReadViolation() {
+        return context != null
+                && context.getRelated().contains(DBOpException.MODIFIED_SINCE_LAST_READ);
+    }
 }

Plan/common/src/main/java/com/djrapitops/plan/storage/database/transactions/init/RemoveOldSampledDataTransaction.java

@@ -17,6 +17,7 @@
 package com.djrapitops.plan.storage.database.transactions.init;
 
 import com.djrapitops.plan.delivery.domain.DateObj;
+import com.djrapitops.plan.exceptions.database.DBOpException;
 import com.djrapitops.plan.identification.ServerUUID;
 import com.djrapitops.plan.storage.database.queries.objects.TPSQueries;
 import com.djrapitops.plan.storage.database.sql.tables.PingTable;
@@ -57,8 +58,15 @@ public RemoveOldSampledDataTransaction(
     protected void performOperations() {
         Optional<Integer> allTimePeak = query(TPSQueries.fetchAllTimePeakPlayerCount(serverUUID)).map(DateObj::getValue);
 
-        execute(cleanTPSTable(allTimePeak.orElse(-1)));
-        execute(cleanPingTable());
+        try {
+            execute(cleanTPSTable(allTimePeak.orElse(-1)));
+            execute(cleanPingTable());
+        } catch (DBOpException e) {
+            if (e.isModifiedSinceLastReadViolation()) {
+                return;
+            }
+            throw e;
+        }
     }
 
     private Executable cleanTPSTable(int allTimePlayerPeak) {