diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/controller/PhasesController.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/controller/PhasesController.java
index 674aa63723ff3af2097b3abb29c465a42347385e..1bfe0ccd2c71a5a1e58ce7e7e677f98eee32c0b9 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/controller/PhasesController.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/controller/PhasesController.java
@@ -67,9 +67,7 @@ public class PhasesController {
             @PathVariable(name = "definitionId") Long definitionId,
             @ApiParam(value = "Phase type", allowableValues = "questionnaire, info, game", required = true)
             @RequestBody @Valid PhaseCreateDTO phaseCreateDTO) {
-
         AbstractPhaseDTO createdPhase = trainingPhaseFacade.createPhase(definitionId, phaseCreateDTO);
-
         return new ResponseEntity<>(createdPhase, HttpStatus.CREATED);
     }
 
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/AbstractPhase.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/AbstractPhase.java
index 98cf6f7609a821015a108bc55b06d9144e790d6d..c2a77de28ea3639d482df5294f912f191db42173 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/AbstractPhase.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/AbstractPhase.java
@@ -23,7 +23,7 @@ public abstract class AbstractPhase implements Serializable {
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "phaseGenerator")
     @SequenceGenerator(name = "phaseGenerator", sequenceName = "phase_seq")
-    @Column(name = "id_phase", nullable = false, unique = true)
+    @Column(name = "phase_id", nullable = false, unique = true)
     private Long id;
 
     private String title;
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/DecisionMatrixRow.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/DecisionMatrixRow.java
index b1ecdd639fa2499b53eb887637c4e96eeec5d4f2..964d9aa41fe0c9e4d824afa92dc6a915c2f93770 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/DecisionMatrixRow.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/DecisionMatrixRow.java
@@ -18,7 +18,7 @@ public class DecisionMatrixRow implements Serializable {
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "decisionMatrixRowGenerator")
     @SequenceGenerator(name = "decisionMatrixRowGenerator", sequenceName = "decision_matrix_row_seq")
-    @Column(name = "id_decision_matrix_row", nullable = false, unique = true)
+    @Column(name = "decision_matrix_row_id", nullable = false, unique = true)
     private Long id;
 
     @Column(name = "order_in_training_phase", nullable = false)
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Question.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Question.java
index 52bfc08e1f0551d36419b397f53f5165629d7fdf..4f02b68c4f239a213d47f7069199a2d85b94b9a5 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Question.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Question.java
@@ -31,7 +31,7 @@ public class Question implements Serializable {
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "questionGenerator")
     @SequenceGenerator(name = "questionGenerator", sequenceName = "question_seq")
-    @Column(name = "id_question", nullable = false, unique = true)
+    @Column(name = "question_id", nullable = false, unique = true)
     private Long id;
 
     @Enumerated(EnumType.STRING)
@@ -46,7 +46,7 @@ public class Question implements Serializable {
     private QuestionnairePhase questionnairePhase;
 
     @OrderBy
-    @OneToMany(mappedBy = "question", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
+    @OneToMany(mappedBy = "question", cascade = {CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE}, orphanRemoval = true, fetch = FetchType.LAZY)
     private List<QuestionChoice> choices = new ArrayList<>();
 
     @ManyToMany(mappedBy = "questions", fetch = FetchType.LAZY)
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionChoice.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionChoice.java
index e866cd4dfa5cfb0dfe8a06b61865d956d05fcfea..1aa21438b9876ffb2dbcc258a51affaa3e32b5f0 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionChoice.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionChoice.java
@@ -18,7 +18,7 @@ public class QuestionChoice implements Serializable {
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "questionChoiceGenerator")
     @SequenceGenerator(name = "questionChoiceGenerator", sequenceName = "question_choice_seq")
-    @Column(name = "id_question_choice", nullable = false, unique = true)
+    @Column(name = "question_choice_id", nullable = false, unique = true)
     private Long id;
 
     private String text;
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionPhaseRelation.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionPhaseRelation.java
index 17f17a526adf5cef28f18dfb4bf82ca0ac3d2752..87fd9068daffc46e90cd74ce0001ab6f0edb3a63 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionPhaseRelation.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionPhaseRelation.java
@@ -23,7 +23,7 @@ public class QuestionPhaseRelation implements Serializable {
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "questionPhaseGenerator")
     @SequenceGenerator(name = "questionPhaseGenerator", sequenceName = "question_phase_seq")
-    @Column(name = "id_question_phase_relation", nullable = false, unique = true)
+    @Column(name = "question_phase_relation_id", nullable = false, unique = true)
     private Long id;
 
     @Column(name = "order_in_questionnaire", nullable = false)
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionnairePhase.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionnairePhase.java
index 7fcfde158858a8a7ecdbc567193fd555a4ace138..85e53f08e5e2e5677c4fcca3a6375176b78ec124 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionnairePhase.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/QuestionnairePhase.java
@@ -14,18 +14,18 @@ import java.util.ArrayList;
 import java.util.List;
 
 @Entity
-@Table(name = "questionnairePhase")
+@Table(name = "questionnaire_phase")
 public class QuestionnairePhase extends AbstractPhase {
 
     @Enumerated(EnumType.STRING)
     private QuestionnaireType questionnaireType;
 
     @OrderBy
-    @OneToMany(mappedBy = "questionnairePhase", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
+    @OneToMany(mappedBy = "questionnairePhase", cascade = {CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE}, orphanRemoval = true, fetch = FetchType.LAZY)
     private List<Question> questions = new ArrayList<>();
 
     @OrderBy
-    @OneToMany(mappedBy = "questionnairePhase", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
+    @OneToMany(mappedBy = "questionnairePhase", cascade = {CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE}, orphanRemoval = true, fetch = FetchType.LAZY)
     private List<QuestionPhaseRelation> questionPhaseRelations = new ArrayList<>();
 
     public List<Question> getQuestions() {
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Task.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Task.java
index 60e04d8b7328ec7ce6e3a3c74c4003179c0bbe76..8a5cd20c69e6b3d8fb1e5f8a47bf9e70ff3f591a 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Task.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/Task.java
@@ -19,7 +19,7 @@ public class Task implements Serializable {
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "taskGenerator")
     @SequenceGenerator(name = "taskGenerator", sequenceName = "task_seq")
-    @Column(name = "id_task", nullable = false, unique = true)
+    @Column(name = "task_id", nullable = false, unique = true)
     private Long id;
 
     private String title;
@@ -27,6 +27,8 @@ public class Task implements Serializable {
     private String answer;
     private String solution;
     private int incorrectAnswerLimit;
+    private boolean isSandboxModified;
+    private int sandboxChangeExpectedDuration;
 
     @Column(name = "order_in_training_phase", nullable = false)
     private Integer order;
@@ -98,6 +100,21 @@ public class Task implements Serializable {
         this.trainingPhase = trainingPhase;
     }
 
+    public boolean isSandboxModified() {
+        return isSandboxModified;
+    }
+
+    public void setSandboxModified(boolean sandboxModified) {
+        isSandboxModified = sandboxModified;
+    }
+
+    public int getSandboxChangeExpectedDuration() {
+        return sandboxChangeExpectedDuration;
+    }
+
+    public void setSandboxChangeExpectedDuration(int sandboxChangeExpectedDuration) {
+        this.sandboxChangeExpectedDuration = sandboxChangeExpectedDuration;
+    }
 
     @Override
     public String toString() {
@@ -108,7 +125,10 @@ public class Task implements Serializable {
                 ", answer='" + answer + '\'' +
                 ", solution='" + solution + '\'' +
                 ", incorrectAnswerLimit=" + incorrectAnswerLimit +
+                ", isSandboxModified=" + isSandboxModified +
+                ", sandboxChangeExpectedDuration=" + sandboxChangeExpectedDuration +
                 ", order=" + order +
+                ", trainingPhase=" + trainingPhase.getId() +
                 '}';
     }
 }
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/TrainingPhase.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/TrainingPhase.java
index f63988c7afe46b8d0f44dc3912b3d2ca1c9f424d..be1db20ab43f314eef6258b2f61bff641484e8a9 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/TrainingPhase.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/domain/TrainingPhase.java
@@ -18,15 +18,15 @@ public class TrainingPhase extends AbstractPhase {
     private int allowedWrongAnswers;
 
     @OrderBy
-    @OneToMany(mappedBy = "trainingPhase", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
+    @OneToMany(mappedBy = "trainingPhase", cascade = CascadeType.REMOVE, orphanRemoval = true, fetch = FetchType.LAZY)
     private List<Task> tasks = new ArrayList<>();
 
     @OrderBy
-    @OneToMany(mappedBy = "trainingPhase", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
+    @OneToMany(mappedBy = "trainingPhase", cascade = {CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE}, orphanRemoval = true, fetch = FetchType.LAZY)
     private List<DecisionMatrixRow> decisionMatrix;
 
     @OrderBy
-    @OneToMany(mappedBy = "relatedTrainingPhase", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
+    @OneToMany(mappedBy = "relatedTrainingPhase", cascade = CascadeType.REMOVE, orphanRemoval = true, fetch = FetchType.LAZY)
     private List<QuestionPhaseRelation> questionPhaseRelations = new ArrayList<>();
 
     public int getEstimatedDuration() {
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/dto/training/TaskDTO.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/dto/training/TaskDTO.java
index d975486ab87e15708d4dc9ae767533d755432ff3..af151412a425139f006058a18b55e17752e0ae58 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/dto/training/TaskDTO.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/dto/training/TaskDTO.java
@@ -9,6 +9,8 @@ public class TaskDTO {
     private String answer;
     private String solution;
     private int incorrectAnswerLimit;
+    private boolean isSandboxModified;
+    private int sandboxChangeExpectedDuration;
 
     public Long getId() {
         return id;
@@ -66,9 +68,25 @@ public class TaskDTO {
         this.incorrectAnswerLimit = incorrectAnswerLimit;
     }
 
+    public boolean isSandboxModified() {
+        return isSandboxModified;
+    }
+
+    public void setSandboxModified(boolean sandboxModified) {
+        isSandboxModified = sandboxModified;
+    }
+
+    public int getSandboxChangeExpectedDuration() {
+        return sandboxChangeExpectedDuration;
+    }
+
+    public void setSandboxChangeExpectedDuration(int sandboxChangeExpectedDuration) {
+        this.sandboxChangeExpectedDuration = sandboxChangeExpectedDuration;
+    }
+
     @Override
     public String toString() {
-        return "TaskDto{" +
+        return "TaskDTO{" +
                 "id=" + id +
                 ", title='" + title + '\'' +
                 ", order=" + order +
@@ -76,6 +94,8 @@ public class TaskDTO {
                 ", answer='" + answer + '\'' +
                 ", solution='" + solution + '\'' +
                 ", incorrectAnswerLimit=" + incorrectAnswerLimit +
-                "} " + super.toString();
+                ", isSandboxModified=" + isSandboxModified +
+                ", sandboxChangeExpectedDuration=" + sandboxChangeExpectedDuration +
+                '}';
     }
 }
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/dto/training/TaskUpdateDTO.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/dto/training/TaskUpdateDTO.java
index bf3b10a3906d8ac6052f97b98a53cf5b6cbd7471..9e5d27868d9ad36663cf1cbb28d579f79489fd86 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/dto/training/TaskUpdateDTO.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/dto/training/TaskUpdateDTO.java
@@ -29,6 +29,13 @@ public class TaskUpdateDTO {
     @PositiveOrZero(message = "Limit of the number of provided incorrect answers must not be a negative number")
     private Integer incorrectAnswerLimit;
 
+    @ApiModelProperty(value = "It defines whether the sandbox can be modified", example = "true")
+    private boolean isSandboxModified;
+
+    @ApiModelProperty(value = "It defines the expected duration of sandbox change defined in seconds", example = "15")
+    @PositiveOrZero(message = "Estimated duration of sandbox change must not be a negative number")
+    private int sandboxChangeExpectedDuration;
+
     public String getTitle() {
         return title;
     }
@@ -69,14 +76,32 @@ public class TaskUpdateDTO {
         this.incorrectAnswerLimit = incorrectAnswerLimit;
     }
 
+    public boolean isSandboxModified() {
+        return isSandboxModified;
+    }
+
+    public void setSandboxModified(boolean sandboxModified) {
+        isSandboxModified = sandboxModified;
+    }
+
+    public int getSandboxChangeExpectedDuration() {
+        return sandboxChangeExpectedDuration;
+    }
+
+    public void setSandboxChangeExpectedDuration(int sandboxChangeExpectedDuration) {
+        this.sandboxChangeExpectedDuration = sandboxChangeExpectedDuration;
+    }
+
     @Override
     public String toString() {
-        return "TaskUpdateDto{" +
+        return "TaskUpdateDTO{" +
                 "title='" + title + '\'' +
                 ", content='" + content + '\'' +
                 ", answer='" + answer + '\'' +
                 ", solution='" + solution + '\'' +
                 ", incorrectAnswerLimit=" + incorrectAnswerLimit +
+                ", isSandboxModified=" + isSandboxModified +
+                ", sandboxChangeExpectedDuration=" + sandboxChangeExpectedDuration +
                 '}';
     }
 }
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/facade/TrainingPhaseFacade.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/facade/TrainingPhaseFacade.java
index e527581d134be522e8d3a177265b228c9879556c..f2fbf5e1f60bf53d92527018eb327b1ba9f5a661 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/facade/TrainingPhaseFacade.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/facade/TrainingPhaseFacade.java
@@ -50,11 +50,8 @@ public class TrainingPhaseFacade {
 
 
     public List<AbstractPhaseDTO> deletePhase(Long definitionId, Long phaseId) {
-
         phaseService.deletePhase(definitionId, phaseId);
-
         trainingPhaseService.alignDecisionMatrixForPhasesInTrainingDefinition(definitionId);
-
         return getPhases(definitionId);
     }
 
@@ -63,7 +60,6 @@ public class TrainingPhaseFacade {
     }
 
     public List<AbstractPhaseDTO> getPhases(Long definitionId) {
-
         return phaseService.getPhases(definitionId);
     }
 
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/InfoPhaseService.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/InfoPhaseService.java
index 5d109ab38897407f15c2fbc93666a8305bc1cafe..557d3466fb30108c1205b901dca5aac254267aa7 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/InfoPhaseService.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/InfoPhaseService.java
@@ -33,14 +33,12 @@ public class InfoPhaseService {
         infoPhase.setOrder(abstractPhaseRepository.getCurrentMaxOrder(trainingDefinitionId) + 1);
 
         InfoPhase persistedEntity = infoPhaseRepository.save(infoPhase);
-
         return BeanMapper.INSTANCE.toDto(persistedEntity);
     }
 
     public InfoPhaseDTO updateInfoPhase(Long definitionId, Long phaseId, InfoPhaseUpdateDTO infoPhaseUpdateDto) {
         InfoPhase infoPhaseUpdate = BeanMapper.INSTANCE.toEntity(infoPhaseUpdateDto);
         infoPhaseUpdate.setId(phaseId);
-
         InfoPhase persistedInfoPhase = infoPhaseRepository.findById(infoPhaseUpdate.getId())
                 .orElseThrow(() -> new RuntimeException("Info phase was not found"));
         // TODO throw proper exception once kypo2-training is migrated
@@ -51,7 +49,6 @@ public class InfoPhaseService {
         infoPhaseUpdate.setOrder(persistedInfoPhase.getOrder());
 
         InfoPhase savedEntity = infoPhaseRepository.save(infoPhaseUpdate);
-
         return BeanMapper.INSTANCE.toDto(savedEntity);
     }
 
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/PhaseService.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/PhaseService.java
index b4aab2b75c8419820a08fc9a7329b4c09f3e4204..db837ce5901184f5bedffcc0b9b78d4e3124ac5a 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/PhaseService.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/PhaseService.java
@@ -30,7 +30,6 @@ public class PhaseService {
 
         // TODO add check to trainingDefinitionId and phaseId (field structure will be probably changed)
 
-
         int phaseOrder = phase.getOrder();
         abstractPhaseRepository.decreaseOrderAfterPhaseWasDeleted(definitionId, phaseOrder);
 
@@ -60,9 +59,7 @@ public class PhaseService {
                 .orElseThrow(() -> new RuntimeException("Phase was not found"));
         // TODO throw proper exception once kypo2-training is migrated
 
-
         int fromOrder = phaseFrom.getOrder();
-
         if (fromOrder < newPosition) {
             abstractPhaseRepository.decreaseOrderOfPhasesOnInterval(phaseFrom.getTrainingDefinitionId(), fromOrder, newPosition);
         } else if (fromOrder > newPosition) {
@@ -74,7 +71,6 @@ public class PhaseService {
 
         phaseFrom.setOrder(newPosition);
         abstractPhaseRepository.save(phaseFrom);
-
         trainingPhaseService.alignDecisionMatrixForPhasesInTrainingDefinition(phaseFrom.getTrainingDefinitionId());
     }
 
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/QuestionnairePhaseService.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/QuestionnairePhaseService.java
index bd93d710804c0500698a52a31deb46a535b2b77a..04ed529a647a0ca54fcc63b4169d03aabd5e11b9 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/QuestionnairePhaseService.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/QuestionnairePhaseService.java
@@ -50,7 +50,6 @@ public class QuestionnairePhaseService {
     }
 
     public QuestionnairePhaseDTO createDefaultQuestionnairePhase(Long trainingDefinitionId, PhaseCreateDTO phaseCreateDTO) {
-
         QuestionnairePhase questionnairePhase = new QuestionnairePhase();
         questionnairePhase.setTitle("Title of questionnaire phase");
         questionnairePhase.setTrainingDefinitionId(trainingDefinitionId);
@@ -63,7 +62,6 @@ public class QuestionnairePhaseService {
         }
 
         QuestionnairePhase persistedEntity = questionnairePhaseRepository.save(questionnairePhase);
-
         return BeanMapper.INSTANCE.toDto(persistedEntity);
     }
 
@@ -92,10 +90,7 @@ public class QuestionnairePhaseService {
         }
 
         QuestionnairePhase savedEntity = questionnairePhaseRepository.save(questionnairePhase);
-
-        QuestionnairePhaseDTO result = BeanMapper.INSTANCE.toDto(savedEntity);
-
-        return result;
+        return BeanMapper.INSTANCE.toDto(savedEntity);
     }
 
     private List<QuestionPhaseRelation> resolveQuestionnairePhaseRelationsUpdate(QuestionnairePhase questionnairePhase, QuestionnaireUpdateDTO questionnaireUpdateDto) {
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/TaskService.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/TaskService.java
index a4498217eef466dea946e73f7b2d94c6e6c03997..67ccb756d62c6aa87d3ec87092b3dda88706b490 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/TaskService.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/TaskService.java
@@ -46,7 +46,6 @@ public class TaskService {
         task.setIncorrectAnswerLimit(1);
 
         Task persistedEntity = taskRepository.save(task);
-
         return BeanMapper.INSTANCE.toDto(persistedEntity);
     }
 
@@ -63,7 +62,6 @@ public class TaskService {
         task.setOrder(taskRepository.getCurrentMaxOrder(phaseId) + 1);
 
         Task persistedEntity = taskRepository.save(task);
-
         return BeanMapper.INSTANCE.toDto(persistedEntity);
     }
 
@@ -92,7 +90,6 @@ public class TaskService {
         taskUpdate.setOrder(persistedTask.getOrder());
 
         Task savedEntity = taskRepository.save(taskUpdate);
-
         return BeanMapper.INSTANCE.toDto(savedEntity);
     }
 
@@ -104,7 +101,6 @@ public class TaskService {
         // TODO add check to trainingDefinitionId and phaseId (field structure will be probably changed)
 
         taskRepository.decreaseOrderAfterTaskWasDeleted(phaseId, task.getOrder());
-
         taskRepository.delete(task);
     }
 
diff --git a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/TrainingPhaseService.java b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/TrainingPhaseService.java
index e733b29f6041e8cf2d8912288778a1f0b30fc813..eb966328881ed69d2ed02badf9162fec60e9dd8f 100644
--- a/src/main/java/cz/muni/ics/kypo/training/adaptive/service/TrainingPhaseService.java
+++ b/src/main/java/cz/muni/ics/kypo/training/adaptive/service/TrainingPhaseService.java
@@ -36,7 +36,6 @@ public class TrainingPhaseService {
     }
 
     public TrainingPhaseDTO createDefaultTrainingPhase(Long trainingDefinitionId) {
-
         TrainingPhase trainingPhase = new TrainingPhase();
         trainingPhase.setTitle("Title of training phase");
         trainingPhase.setTrainingDefinitionId(trainingDefinitionId);
@@ -45,7 +44,6 @@ public class TrainingPhaseService {
         trainingPhase.setDecisionMatrix(prepareDefaultDecisionMatrix(trainingDefinitionId, trainingPhase));
 
         TrainingPhase persistedEntity = trainingPhaseRepository.save(trainingPhase);
-
         return BeanMapper.INSTANCE.toDto(persistedEntity);
     }
 
@@ -68,7 +66,6 @@ public class TrainingPhaseService {
         }
 
         TrainingPhase savedEntity = trainingPhaseRepository.save(trainingPhase);
-
         return BeanMapper.INSTANCE.toDto(savedEntity);
     }
 
@@ -95,7 +92,6 @@ public class TrainingPhaseService {
 
             result.add(decisionMatrixRow);
         }
-
         return result;
     }
 
@@ -110,7 +106,6 @@ public class TrainingPhaseService {
         }
 
         final int expectedNumberOfRows = currentPhaseOrder + 1;
-
         if (numberOfRows == expectedNumberOfRows) {
             return;
         } else if (numberOfRows < expectedNumberOfRows) {
@@ -118,7 +113,6 @@ public class TrainingPhaseService {
             trainingPhase.getDecisionMatrix().addAll(newDecisionMatrixRows);
         } else {
             List<DecisionMatrixRow> neededDecisionMatrixRows = getOnlyNeededDecisionMatrixRows(expectedNumberOfRows, trainingPhase);
-
             trainingPhase.getDecisionMatrix().clear();
             trainingPhase.getDecisionMatrix().addAll(neededDecisionMatrixRows);
         }
@@ -135,13 +129,11 @@ public class TrainingPhaseService {
 
             result.add(decisionMatrixRow);
         }
-
         return result;
     }
 
     private List<DecisionMatrixRow> getOnlyNeededDecisionMatrixRows(int expectedNumberOfRows, TrainingPhase trainingPhase) {
         List<DecisionMatrixRow> decisionMatrix = trainingPhase.getDecisionMatrix();
-
         return decisionMatrix.stream()
                 .sorted(Comparator.comparingInt(DecisionMatrixRow::getOrder))
                 .limit(expectedNumberOfRows)