diff --git a/src/main/java/it/cnr/isti/workflow/manager/auth/repo/LoginEntity.java b/src/main/java/it/cnr/isti/workflow/manager/auth/repo/LoginEntity.java
index 8754ad2..3429d65 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/auth/repo/LoginEntity.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/auth/repo/LoginEntity.java
@@ -1,4 +1,4 @@
-package it.cnr.isti.workflow.manager.auth.model;
+package it.cnr.isti.workflow.manager.auth.repo;
 
 import jakarta.persistence.Entity;
 import jakarta.persistence.Id;
diff --git a/src/main/java/it/cnr/isti/workflow/manager/blocks/Block.java b/src/main/java/it/cnr/isti/workflow/manager/blocks/Block.java
index ce63348..0c187f0 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/blocks/Block.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/blocks/Block.java
@@ -14,12 +14,12 @@ import lombok.Singular;
 
 @NoArgsConstructor(access = lombok.AccessLevel.PROTECTED)
 @Getter
-public class Block<T extends BlockType, C extends BlockConfiguration<T>> {
+public class Block<T extends BlockType> {
 
     final String id = UUID.randomUUID().toString();
 
     @Builder
-    public Block(C specificConfiguration, String name, T type, @Singular List<String> inputs, @Singular List<String> outputs, @Singular List<Brick> bricks) {
+    public Block(BlockConfiguration<T> specificConfiguration, String name, T type, @Singular List<String> inputs, @Singular List<String> outputs, @Singular List<Brick> bricks) {
         this.specificConfiguration = specificConfiguration;
         this.name = name;
         this.type = type;
@@ -35,6 +35,6 @@ public class Block<T extends BlockType, C extends BlockConfiguration<T>> {
 
     List<String> outputs;
 
-    C specificConfiguration;
+    BlockConfiguration<T> specificConfiguration;
 
 }
diff --git a/src/main/java/it/cnr/isti/workflow/manager/blocks/factories/BlockFactory.java b/src/main/java/it/cnr/isti/workflow/manager/blocks/factories/BlockFactory.java
index 972d5bb..4dbbd2c 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/blocks/factories/BlockFactory.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/blocks/factories/BlockFactory.java
@@ -13,7 +13,7 @@ public interface BlockFactory<T extends BlockType, C extends BlockConfiguration<
      * @param configuration the configuration for the block
      * @return a new Block instance
      */
-    Block<T, C> create(@Valid C configuration);
+    Block<T> create(@Valid C configuration);
 
     /**
      * Returns the type of block this factory creates.
diff --git a/src/main/java/it/cnr/isti/workflow/manager/blocks/factories/LLMBlockFactory.java b/src/main/java/it/cnr/isti/workflow/manager/blocks/factories/LLMBlockFactory.java
index 57a30df..ad08279 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/blocks/factories/LLMBlockFactory.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/blocks/factories/LLMBlockFactory.java
@@ -4,13 +4,12 @@ import java.util.HashSet;
 import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
-
 import it.cnr.isti.workflow.manager.blocks.Block;
 import it.cnr.isti.workflow.manager.blocks.configurations.LLMBlockConfiguration;
 import it.cnr.isti.workflow.manager.blocks.types.LLMBlockType;
+import jakarta.validation.Valid;
 
 @Component
 public class LLMBlockFactory implements BlockFactory<LLMBlockType, LLMBlockConfiguration> {
@@ -19,16 +18,7 @@ public class LLMBlockFactory implements BlockFactory<LLMBlockType, LLMBlockConfi
     @Autowired
     LLMBlockType blockType;
 
-    @Override
-    public Block<LLMBlockType, LLMBlockConfiguration> create(LLMBlockConfiguration configuration) {
-        String prompt =configuration.getPrompt();
-        Block<LLMBlockType, LLMBlockConfiguration> block = Block.<LLMBlockType, LLMBlockConfiguration>builder()
-                .type(blockType).inputs(retrieveInputs(prompt)).output("response")
-                .specificConfiguration(configuration)
-                .build();
-        
-        return block;
-    }
+    
 
     @Override
     public Class<LLMBlockType> getBlockType() {
@@ -46,4 +36,15 @@ public class LLMBlockFactory implements BlockFactory<LLMBlockType, LLMBlockConfi
         return names;
     }
 
+    @Override
+    public Block<LLMBlockType> create(@Valid LLMBlockConfiguration configuration) {
+        String prompt =configuration.getPrompt();
+        Block<LLMBlockType> block = Block.<LLMBlockType>builder()
+                .type(blockType).inputs(retrieveInputs(prompt)).output("response")
+                .specificConfiguration(configuration)
+                .build();
+
+        return block;    }
+
+
 }
diff --git a/src/main/java/it/cnr/isti/workflow/manager/bricks/LLMBrick.java b/src/main/java/it/cnr/isti/workflow/manager/bricks/LLMBrick.java
index 2c6dd84..c2f4c1c 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/bricks/LLMBrick.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/bricks/LLMBrick.java
@@ -1,20 +1,30 @@
 package it.cnr.isti.workflow.manager.bricks;
 
+import java.util.Map;
 
-public class LLMBrick extends Brick {
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import it.cnr.isti.workflow.manager.llms.providers.LLMProvider;
 
-    private final String provider;
+public class LLMBrick extends Brick  {
+
+    @JsonIgnore
+    private final LLMProvider provider;
+    
     private final String model;
 
+    public String generate(String prompt, Map<String, Object> executionParameters) {
+        return provider.generate(model, prompt);
+    }
 
-    public LLMBrick(String provider, String model, String brickManager) {
-        super(provider + "_" + model, brickManager);
+
+    public LLMBrick(LLMProvider provider, String model, String brickManager) {
+        super(provider.getName() + "_" + model, brickManager);
         this.provider = provider;
         this.model = model;
     }
 
     public String getProvider() {
-        return provider;
+        return provider.getName();
     }
 
     public String getModel() {
diff --git a/src/main/java/it/cnr/isti/workflow/manager/bricks/LLMBrickManager.java b/src/main/java/it/cnr/isti/workflow/manager/bricks/LLMBrickManager.java
index 0a244b9..9f8107e 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/bricks/LLMBrickManager.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/bricks/LLMBrickManager.java
@@ -21,7 +21,7 @@ public class LLMBrickManager extends BrickManager<LLMBrick> {
     public List<LLMBrick> getBricks() {
         List<LLMBrick> bricks = new ArrayList<>();
         llmProviders.forEach(p -> p.getRegisteredModels().stream()
-                .map(model -> new LLMBrick(p.getClass().getSimpleName(), model, "llmBrickProvider"))
+                .map(model -> new LLMBrick(p, model, "llmBrickProvider"))
                 .forEach(brick -> bricks.add(brick)));
         return bricks;
     }
diff --git a/src/main/java/it/cnr/isti/workflow/manager/bricks/extensions/ExecutionBrick.java b/src/main/java/it/cnr/isti/workflow/manager/bricks/extensions/ExecutionBrick.java
new file mode 100644
index 0000000..90fcaaa
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/bricks/extensions/ExecutionBrick.java
@@ -0,0 +1,8 @@
+package it.cnr.isti.workflow.manager.bricks.extensions;
+
+import java.util.Map;
+
+public interface ExecutionBrick<OUTPUT> {
+
+    OUTPUT execute(Map<String, Object> parameters, Map<String, Object> configParameters);
+}
diff --git a/src/main/java/it/cnr/isti/workflow/manager/controllers/BlocksController.java b/src/main/java/it/cnr/isti/workflow/manager/controllers/BlocksController.java
index 6aa2294..f04d28b 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/controllers/BlocksController.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/controllers/BlocksController.java
@@ -51,12 +51,12 @@ public class BlocksController {
 
     @SuppressWarnings("unchecked")
     @PostMapping
-    public <T extends BlockType, C extends BlockConfiguration<T>> Block<T, C> create(@RequestBody @Valid C blockConfiguration) {
+    public <T extends BlockType, C extends BlockConfiguration<T>> Block<T> create(@RequestBody @Valid C blockConfiguration) {
         BlockFactory<T, C> factory = (BlockFactory<T, C>) blockFactories.stream()
                 .filter(f -> f.getBlockType().equals(blockConfiguration.getType()))
                 .findFirst()
                 .orElseThrow(() -> new IllegalArgumentException("Block factory not found for type: " + blockConfiguration.getType()));
-        Block<T, C> block = factory.create(blockConfiguration);
+        Block<T> block = factory.create(blockConfiguration);
         return block;
     }
 
diff --git a/src/main/java/it/cnr/isti/workflow/manager/controllers/FlowController.java b/src/main/java/it/cnr/isti/workflow/manager/controllers/FlowController.java
index 3aeaa22..45079c7 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/controllers/FlowController.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/controllers/FlowController.java
@@ -1,21 +1,32 @@
 package it.cnr.isti.workflow.manager.controllers;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
+import it.cnr.isti.workflow.manager.auth.repo.LoginEntity;
+import it.cnr.isti.workflow.manager.flows.FlowService;
+import it.cnr.isti.workflow.manager.flows.model.Flow;
 import it.cnr.isti.workflow.manager.flows.repo.FlowEntity;
 
 @RestController
 @RequestMapping("/flows")
 public class FlowController {
 
+    @Autowired
+    FlowService flowService;
+
+   
 
     @PostMapping
-    public ResponseEntity<FlowEntity> createFlow(@RequestBody FlowEntity flowEntity) {
-        FlowEntity createdFlow = flowService.createFlow(flowEntity);
-        
+    public ResponseEntity<FlowEntity> createFlow(@RequestBody Flow flow,  @AuthenticationPrincipal 
+    LoginEntity userDetails) {
+        FlowEntity createdFlow = flowService.createFlow(userDetails.getUsername(), flow);
+        return ResponseEntity.ok(createdFlow);
     }
 
 }
diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/ExecutionContext.java b/src/main/java/it/cnr/isti/workflow/manager/executions/ExecutionContext.java
new file mode 100644
index 0000000..96d5ac8
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/ExecutionContext.java
@@ -0,0 +1,100 @@
+package it.cnr.isti.workflow.manager.executions;
+
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter()
+@NoArgsConstructor
+public class ExecutionContext {
+    
+    public enum Status {
+        CREATED(true, false, false),
+        INITIALIZING(true, false, false),
+        READY(true, false, false), 
+        RUNNING(false, false, false),
+        WAITING(false, false, true),
+        SUCCESS(false, true, false),
+        ERROR(false, true, false);
+        
+        private boolean initState;
+
+        private boolean finalState;
+        private boolean waitingState;
+
+        Status(boolean initState, boolean finalState, boolean waitingState) {
+            this.initState = initState;
+            this.finalState = finalState;
+            this.waitingState = waitingState;
+        }
+
+        public boolean isInitState() {
+            return initState;
+        }
+
+        public boolean isFinalState() {
+            return finalState;
+        }
+
+        public boolean isWaitingState() {
+            return waitingState ;
+        }
+
+        public boolean isRunningState() {
+            return !finalState && !initState && !waitingState;
+        }
+    }
+
+    Map<String, Object> inputs = new HashMap<>();
+
+    @Getter()
+    private Map<FieldKey, Object> result = new HashMap<>();
+
+    Long startTime = null;
+    Long endTime = null;
+
+    List<String> stepsUnderExecution = new ArrayList<>();
+    List<String> waitingSteps = new ArrayList<>();
+    Map<String, String> errors = new HashMap<>();
+    List<String> warnings = new ArrayList<>();
+
+
+    Map<String, Map<String, Object>> nodeResult = new HashMap<>();
+
+    Status status = Status.CREATED;
+
+    public void setStatus(Status status) {
+        this.status = status;
+        if (status == Status.RUNNING) {
+            this.startTime = System.currentTimeMillis();
+        } else if (status == Status.SUCCESS || status == Status.ERROR) {
+            this.endTime = System.currentTimeMillis();
+        }
+    }
+
+    public void addNodeResult(String nodeId, Map<String, Object> result) {
+        this.nodeResult.put(nodeId, result);
+    }
+
+    public void addResult(String nodeId, String key, Object value) {
+        this.result.put(new FieldKey(nodeId, key), value);
+    }
+
+    public void addInput(String key, Object value) {
+        this.inputs.put(key, value);
+    }
+
+    public void addError(String nodeId, String error) {
+        this.errors.put(nodeId, error);
+    }
+
+    public Map<FieldKey, Object> getExecutionResult() {
+        return Collections.unmodifiableMap(this.result);
+    }
+}
+
diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/ExecutorDescriptor.java b/src/main/java/it/cnr/isti/workflow/manager/executions/ExecutorDescriptor.java
new file mode 100644
index 0000000..d02dd5a
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/ExecutorDescriptor.java
@@ -0,0 +1,28 @@
+package it.cnr.isti.workflow.manager.executions;
+
+import java.util.List;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NonNull;
+import lombok.Singular;
+
+@Data
+@AllArgsConstructor
+@Builder
+public class ExecutorDescriptor {
+
+
+    @NonNull
+    String identifier;
+    @NonNull
+    String name;
+    
+    String description;
+    @Singular
+    List<String> inputNames;
+    @Singular
+    List<String> outputNames;
+
+}
diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/FieldKey.java b/src/main/java/it/cnr/isti/workflow/manager/executions/FieldKey.java
new file mode 100644
index 0000000..160e87f
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/FieldKey.java
@@ -0,0 +1,8 @@
+package it.cnr.isti.workflow.manager.executions;
+
+public record FieldKey(String nodeId, String fieldId) {
+    @Override
+    public final String toString() {
+        return nodeId + ":" + fieldId;
+    }
+}
diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/InputConsumer.java b/src/main/java/it/cnr/isti/workflow/manager/executions/InputConsumer.java
new file mode 100644
index 0000000..d476e7e
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/InputConsumer.java
@@ -0,0 +1,7 @@
+package it.cnr.isti.workflow.manager.executions;
+
+public interface InputConsumer {
+
+    void consumeInput(String key, Object value);
+
+}
diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/OutputProducer.java b/src/main/java/it/cnr/isti/workflow/manager/executions/OutputProducer.java
new file mode 100644
index 0000000..558e44b
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/OutputProducer.java
@@ -0,0 +1,9 @@
+package it.cnr.isti.workflow.manager.executions;
+
+public interface OutputProducer {
+
+    void produceOutput(String key, Object value);
+
+    void registerConsumer(InputConsumer consumer );
+
+}
diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/steps/Input.java b/src/main/java/it/cnr/isti/workflow/manager/executions/steps/Input.java
new file mode 100644
index 0000000..06e4f8a
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/steps/Input.java
@@ -0,0 +1,25 @@
+package it.cnr.isti.workflow.manager.executions.steps;
+
+import lombok.Getter;
+
+@Getter
+public class Input {
+
+    String name;
+    private Object value = null;
+
+    private boolean registered = false;
+
+    Input(String name) {
+        this.name = name; 
+    }
+
+    public void setValue(Object value) {
+        this.value = value;
+    }
+
+    protected void registered() {
+        this.registered = true;
+    }
+
+}
diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/steps/LLMStep.java b/src/main/java/it/cnr/isti/workflow/manager/executions/steps/LLMStep.java
new file mode 100644
index 0000000..38ba74d
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/steps/LLMStep.java
@@ -0,0 +1,15 @@
+package it.cnr.isti.workflow.manager.executions.steps;
+
+import it.cnr.isti.workflow.manager.blocks.Block;
+import it.cnr.isti.workflow.manager.blocks.types.LLMBlockType;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = lombok.AccessLevel.PRIVATE)
+public class LLMStep extends Step<LLMBlockType> {
+
+    LLMStep(Block<LLMBlockType> block) {
+        super(block);
+    }
+
+    
+}
diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/steps/Output.java b/src/main/java/it/cnr/isti/workflow/manager/executions/steps/Output.java
new file mode 100644
index 0000000..c3d4f40
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/steps/Output.java
@@ -0,0 +1,29 @@
+package it.cnr.isti.workflow.manager.executions.steps;
+
+import java.util.List;
+
+import lombok.Getter;
+
+public class Output {
+
+    @Getter
+    String name;
+
+    private List<Input> consumers = List.of();
+
+    Output(String name) {
+       this.name = name;
+    }
+
+    void register(Input input) {
+       this.consumers.add(input);
+       input.registered();
+    }
+
+    void setValue(Object value) {
+        for (Input consumer : consumers) {
+            consumer.setValue(value);
+        }
+    }
+    
+}
diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/steps/Step.java b/src/main/java/it/cnr/isti/workflow/manager/executions/steps/Step.java
new file mode 100644
index 0000000..ab52ebb
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/steps/Step.java
@@ -0,0 +1,32 @@
+package it.cnr.isti.workflow.manager.executions.steps;
+
+import java.util.List;
+
+import it.cnr.isti.workflow.manager.blocks.Block;
+import it.cnr.isti.workflow.manager.blocks.types.BlockType;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = lombok.AccessLevel.PROTECTED)
+@Getter
+public abstract class Step<B extends BlockType> {
+
+    private Block<B> block;
+
+    List<Input> inputs = List.of();
+    List<Output> outputs = List.of();
+
+    protected Step(Block<B> block) {
+        // Initialize the step with the provided block
+        this.block = block;
+        this.block.getOutputs().forEach(outputName -> {
+            Output output = new Output(outputName);
+            this.outputs.add(output);
+        });
+        this.block.getInputs().forEach(inputName -> {
+            Input input = new Input(inputName);
+            this.inputs.add(input);
+        });
+    }
+
+}
diff --git a/src/main/java/it/cnr/isti/workflow/manager/flows/FlowConverter.java b/src/main/java/it/cnr/isti/workflow/manager/flows/FlowConverter.java
new file mode 100644
index 0000000..7b3c3d0
--- /dev/null
+++ b/src/main/java/it/cnr/isti/workflow/manager/flows/FlowConverter.java
@@ -0,0 +1,37 @@
+package it.cnr.isti.workflow.manager.flows;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import it.cnr.isti.workflow.manager.flows.model.Flow;
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+
+@Converter(autoApply = false)
+public class FlowConverter implements AttributeConverter<Flow, String> {
+
+    private static final ObjectMapper objectMapper = new ObjectMapper();
+
+    @Override
+    public String convertToDatabaseColumn(Flow flow) {
+        if (flow == null) {
+            return null;
+        }
+        try {
+            return objectMapper.writeValueAsString(flow);
+        } catch (JsonProcessingException e) {
+            throw new IllegalArgumentException("Errore nella serializzazione di Flow in JSON", e);
+        }
+    }
+
+    @Override
+    public Flow convertToEntityAttribute(String dbData) {
+        if (dbData == null || dbData.isBlank()) {
+            return null;
+        }
+        try {
+            return objectMapper.readValue(dbData, Flow.class);
+        } catch (Exception e) {
+            throw new IllegalArgumentException("Errore nella deserializzazione di JSON in Flow", e);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/it/cnr/isti/workflow/manager/flows/FlowService.java b/src/main/java/it/cnr/isti/workflow/manager/flows/FlowService.java
index 51ee1c4..615038f 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/flows/FlowService.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/flows/FlowService.java
@@ -15,15 +15,13 @@ public class FlowService {
     @Autowired
     FlowRepository flowRepository;
 
-    public FlowEntity createFlow(String name, String description, String owner, Flow flow) {
+    public FlowEntity createFlow(String owner, Flow flow) {
         FlowEntity flowEntity = new FlowEntity();
         LocalDateTime now = LocalDateTime.now();
         flowEntity.setCreatedAt(now);
         flowEntity.setLastUpdateAt(now);
         flowEntity.setFlow(flow);
         flowEntity.setOwner(owner);
-        flowEntity.setName(name);
-        flowEntity.setDescription(description);
         return flowRepository.save(flowEntity);
     }
 }
diff --git a/src/main/java/it/cnr/isti/workflow/manager/flows/model/Connection.java b/src/main/java/it/cnr/isti/workflow/manager/flows/model/Connection.java
index d86e0fc..7a20d03 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/flows/model/Connection.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/flows/model/Connection.java
@@ -1,4 +1,4 @@
-package it.cnr.isti.workflow.manager.flows;
+package it.cnr.isti.workflow.manager.flows.model;
 
 import java.util.UUID;
 
diff --git a/src/main/java/it/cnr/isti/workflow/manager/flows/model/Flow.java b/src/main/java/it/cnr/isti/workflow/manager/flows/model/Flow.java
index 4cfe4f1..e285ae7 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/flows/model/Flow.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/flows/model/Flow.java
@@ -3,10 +3,12 @@ package it.cnr.isti.workflow.manager.flows.model;
 import java.util.List;
 
 import it.cnr.isti.workflow.manager.blocks.Block;
+import jakarta.validation.constraints.NotBlank;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
 import lombok.NoArgsConstructor;
+import lombok.NonNull;
 import lombok.Singular;
 
 @Data
@@ -15,8 +17,14 @@ import lombok.Singular;
 @AllArgsConstructor
 public class Flow {
 
+    @NonNull
+    @NotBlank
+    String name;
+
+    String description;
+
     @Singular
-    List<Block<?, ?>> blocks;
+    List<Block<?>> blocks;
 
     @Singular
     List<Connection> connections;
diff --git a/src/main/java/it/cnr/isti/workflow/manager/flows/repo/FlowEntity.java b/src/main/java/it/cnr/isti/workflow/manager/flows/repo/FlowEntity.java
index 67f6446..07c3962 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/flows/repo/FlowEntity.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/flows/repo/FlowEntity.java
@@ -1,10 +1,11 @@
 package it.cnr.isti.workflow.manager.flows.repo;
 
-import java.sql.Date;
 import java.time.LocalDateTime;
 
+import it.cnr.isti.workflow.manager.flows.FlowConverter;
 import it.cnr.isti.workflow.manager.flows.model.Flow;
 import jakarta.persistence.Column;
+import jakarta.persistence.Convert;
 import jakarta.persistence.Entity;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.GenerationType;
@@ -51,5 +52,6 @@ public class FlowEntity {
 
     @Lob
     @Column(name = "flow_data", columnDefinition = "TEXT")
+    @Convert(converter = FlowConverter.class)
     private Flow flow;
 }
diff --git a/src/main/java/it/cnr/isti/workflow/manager/llms/providers/LLMProvider.java b/src/main/java/it/cnr/isti/workflow/manager/llms/providers/LLMProvider.java
index 79b4659..1cb5db6 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/llms/providers/LLMProvider.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/llms/providers/LLMProvider.java
@@ -4,6 +4,7 @@ import java.util.List;
 
 public interface LLMProvider {
 
+    String getName();
     List<String> getRegisteredModels();
     String generate(String model, String prompt);
 
diff --git a/src/main/java/it/cnr/isti/workflow/manager/llms/providers/google/GeminiLLMProvider.java b/src/main/java/it/cnr/isti/workflow/manager/llms/providers/google/GeminiLLMProvider.java
index dda487d..a26dcb0 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/llms/providers/google/GeminiLLMProvider.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/llms/providers/google/GeminiLLMProvider.java
@@ -25,14 +25,17 @@ public class GeminiLLMProvider implements LLMProvider {
             "gemini-1.5-flash",
             "gemini-1.5-pro",
             "gemini-2.0-flash",
-            "gemini-2.0-flash-lite"
-    );
-
+            "gemini-2.0-flash-lite");
 
     public GeminiLLMProvider(WebClient.Builder webClientBuilder) {
         this.webClientBuilder = webClientBuilder;
     }
 
+    @Override
+    public String getName() {
+        return "GeminiLLMProvider";
+    }
+
     public void setApiKey(String apiKey) {
         this.apiKey = apiKey;
     }
@@ -40,9 +43,9 @@ public class GeminiLLMProvider implements LLMProvider {
     public String generate(String model, String prompt) {
         Objects.requireNonNull(prompt, "prompt cannot be null");
         Objects.requireNonNull(model, "model cannot be null");
-        if (!MODELS.contains(model)) 
+        if (!MODELS.contains(model))
             throw new IllegalArgumentException("Model not supported: " + model);
-        
+
         Map<String, Object> requestBody = Map.of(
                 "contents", List.of( // Usa List.of invece di new Object[]
                         Map.of(
@@ -68,7 +71,7 @@ public class GeminiLLMProvider implements LLMProvider {
                 .retryWhen(
                         Retry.backoff(10, Duration.ofSeconds(30))
                                 .filter(throwable -> throwable instanceof RuntimeException
-                                    || throwable instanceof java.util.concurrent.TimeoutException)
+                                        || throwable instanceof java.util.concurrent.TimeoutException)
                                 .onRetryExhaustedThrow((retryBackoffSpec, retrySignal) -> new RuntimeException(
                                         "Error contacting Gemini API", retrySignal.failure())));
 
diff --git a/src/main/java/it/cnr/isti/workflow/manager/llms/providers/ollama/InternalOllamaLLMProvider.java b/src/main/java/it/cnr/isti/workflow/manager/llms/providers/ollama/InternalOllamaLLMProvider.java
index 5086e9d..613c0a0 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/llms/providers/ollama/InternalOllamaLLMProvider.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/llms/providers/ollama/InternalOllamaLLMProvider.java
@@ -1,7 +1,5 @@
 package it.cnr.isti.workflow.manager.llms.providers.ollama;
 
-
-
 import java.time.Duration;
 import java.util.List;
 import java.util.Map;
@@ -23,82 +21,88 @@ import reactor.core.publisher.Mono;
 @Service
 public class InternalOllamaLLMProvider implements LLMProvider {
 
-    private static final Logger log = org.slf4j.LoggerFactory.getLogger(InternalOllamaLLMProvider.class);
-    private String ollamaKey;
+        private static final Logger log = org.slf4j.LoggerFactory.getLogger(InternalOllamaLLMProvider.class);
+        private String ollamaKey;
 
-    private final WebClient.Builder webClientBuilder;
-    private String ollamaURL;
+        private final WebClient.Builder webClientBuilder;
+        private String ollamaURL;
 
-    public InternalOllamaLLMProvider(WebClient.Builder webClientBuilder, @Value("${app.ollama.internal.key}") String ollamakey,
-            @Value("${app.ollama.internal.url}") String ollamaUri) {
-        Objects.requireNonNull(ollamakey, "ollamaKey cannot be null");
-        Objects.requireNonNull(ollamaUri, "ollamaUri cannot be null");
-        this.ollamaKey = ollamakey;
-        this.ollamaURL = ollamaUri;
+        public InternalOllamaLLMProvider(WebClient.Builder webClientBuilder,
+                        @Value("${app.ollama.internal.key}") String ollamakey,
+                        @Value("${app.ollama.internal.url}") String ollamaUri) {
+                Objects.requireNonNull(ollamakey, "ollamaKey cannot be null");
+                Objects.requireNonNull(ollamaUri, "ollamaUri cannot be null");
+                this.ollamaKey = ollamakey;
+                this.ollamaURL = ollamaUri;
 
-        this.webClientBuilder = webClientBuilder;
-    }
-
-    public String generate(String model, String prompt) {
-        Objects.requireNonNull(prompt, "prompt cannot be null");
-        Objects.requireNonNull(model, "model cannot be null");
-        ObjectMapper mapper = new ObjectMapper();
-        Map<String, Object> bodyMap = Map.of(
-                "model", model,
-                "prompt", prompt,
-                "stream", false);
-        String requestBody = null;
-        try{
-           requestBody =  mapper.writeValueAsString(bodyMap);
-        }catch (Exception e) {
-            log.error("Error serializing request body: {}", e.getMessage(), e);
-            throw new RuntimeException("Error serializing request body", e);
+                this.webClientBuilder = webClientBuilder;
         }
-        log.debug("ollama body request: {} ", requestBody);
 
-        // Implement the logic to call the Ollama API and return the response
-        WebClient webClient = webClientBuilder.baseUrl(this.ollamaURL).build();
+        @Override
+        public String getName() {
+                return "InternalOllamaLLMProvider";
+        }
 
-        Mono<GenerateResponse> result = webClient.post()
-                .uri(uriBuilder -> uriBuilder.pathSegment("generate")
-                        .build())
-                .header("Authorization", "Bearer " + ollamaKey)
-                .contentType(MediaType.APPLICATION_JSON)
-                .bodyValue(requestBody)
-                .retrieve()
-                .onStatus(
-                        status -> status.is5xxServerError(),
-                        clientResponse -> clientResponse.bodyToMono(String.class)
-                                .defaultIfEmpty("Error: server without body")
-                                .flatMap(body -> Mono.error(new RuntimeException("Error 5xx: " + body))))
-                .bodyToMono(GenerateResponse.class) // deserialize JSON in oggetto Java
-                .timeout(Duration.ofMinutes(2));
+        public String generate(String model, String prompt) {
+                Objects.requireNonNull(prompt, "prompt cannot be null");
+                Objects.requireNonNull(model, "model cannot be null");
+                ObjectMapper mapper = new ObjectMapper();
+                Map<String, Object> bodyMap = Map.of(
+                                "model", model,
+                                "prompt", prompt,
+                                "stream", false);
+                String requestBody = null;
+                try {
+                        requestBody = mapper.writeValueAsString(bodyMap);
+                } catch (Exception e) {
+                        log.error("Error serializing request body: {}", e.getMessage(), e);
+                        throw new RuntimeException("Error serializing request body", e);
+                }
+                log.debug("ollama body request: {} ", requestBody);
 
-        return result.block().getResponse(); // Placeholder for actual implementation
-    }
+                // Implement the logic to call the Ollama API and return the response
+                WebClient webClient = webClientBuilder.baseUrl(this.ollamaURL).build();
 
-    public List<String> getRegisteredModels() {
-        WebClient webClient = webClientBuilder.baseUrl(this.ollamaURL).build();
+                Mono<GenerateResponse> result = webClient.post()
+                                .uri(uriBuilder -> uriBuilder.pathSegment("generate")
+                                                .build())
+                                .header("Authorization", "Bearer " + ollamaKey)
+                                .contentType(MediaType.APPLICATION_JSON)
+                                .bodyValue(requestBody)
+                                .retrieve()
+                                .onStatus(
+                                                status -> status.is5xxServerError(),
+                                                clientResponse -> clientResponse.bodyToMono(String.class)
+                                                                .defaultIfEmpty("Error: server without body")
+                                                                .flatMap(body -> Mono.error(new RuntimeException(
+                                                                                "Error 5xx: " + body))))
+                                .bodyToMono(GenerateResponse.class) // deserialize JSON in oggetto Java
+                                .timeout(Duration.ofMinutes(2));
 
-        Mono<List<String>> result = webClient.get()
-                .uri(uriBuilder -> uriBuilder.pathSegment("tags")
-                        .build())
-                .header("Authorization", "Bearer " + ollamaKey)
-                .retrieve()
-                .onStatus(
-                        status -> status.is5xxServerError(),
-                        clientResponse -> clientResponse.bodyToMono(String.class)
-                                .defaultIfEmpty("Error: server without body")
-                                .flatMap(body -> Mono.error(new RuntimeException("Error 5xx: " + body))))
-                .bodyToMono(ModelResponse.class) // deserialize JSON in oggetto Java
-                .timeout(Duration.ofMinutes(1))
-                .map(modelResponse -> modelResponse.getModels().stream()
-                        .map(ModelInfo::getName)
-                        .toList());
+                return result.block().getResponse(); // Placeholder for actual implementation
+        }
 
-        return result.block();
-    }
+        public List<String> getRegisteredModels() {
+                WebClient webClient = webClientBuilder.baseUrl(this.ollamaURL).build();
 
+                Mono<List<String>> result = webClient.get()
+                                .uri(uriBuilder -> uriBuilder.pathSegment("tags")
+                                                .build())
+                                .header("Authorization", "Bearer " + ollamaKey)
+                                .retrieve()
+                                .onStatus(
+                                                status -> status.is5xxServerError(),
+                                                clientResponse -> clientResponse.bodyToMono(String.class)
+                                                                .defaultIfEmpty("Error: server without body")
+                                                                .flatMap(body -> Mono.error(new RuntimeException(
+                                                                                "Error 5xx: " + body))))
+                                .bodyToMono(ModelResponse.class) // deserialize JSON in oggetto Java
+                                .timeout(Duration.ofMinutes(1))
+                                .map(modelResponse -> modelResponse.getModels().stream()
+                                                .map(ModelInfo::getName)
+                                                .toList());
+
+                return result.block();
+        }
 
 }
-
diff --git a/src/test/java/it/cnr/isti/workflow/manager/MyTestConfiguration.java b/src/test/java/it/cnr/isti/workflow/manager/MyTestConfiguration.java
index 3958c47..adbc236 100644
--- a/src/test/java/it/cnr/isti/workflow/manager/MyTestConfiguration.java
+++ b/src/test/java/it/cnr/isti/workflow/manager/MyTestConfiguration.java
@@ -8,9 +8,10 @@ import org.springframework.context.annotation.Profile;
 
 import it.cnr.isti.workflow.manager.bricks.Brick;
 import it.cnr.isti.workflow.manager.bricks.BrickManager;
+import it.cnr.isti.workflow.manager.bricks.LLMBrick;
+import it.cnr.isti.workflow.manager.llms.providers.LLMProvider;
 
 @TestConfiguration
-@Profile("test")
 public class MyTestConfiguration {
 
     @Bean(name = "testProvider")
@@ -27,4 +28,35 @@ public class MyTestConfiguration {
         };
     }
 
+    @Bean(name = "llmBrickTestManager")
+    BrickManager<LLMBrick> llmBrickManagerProvider() {
+        return new BrickManager<LLMBrick>() {
+            @Override
+            public List<LLMBrick> getBricks() {
+                
+                LLMProvider provider = new LLMProvider() {
+                    @Override
+                    public String getName() {
+                        return "llmTestProvider";
+                    }
+
+                    @Override
+                    public List<String> getRegisteredModels() {
+                        return List.of("testModel");
+                    }
+
+                    @Override
+                    public String generate(String model, String prompt) {
+                        return "Generated response on " + model + " for prompt: " + prompt;
+                    }
+                };
+
+                LLMBrick b = new LLMBrick(provider, "testModel", "testBrickManager");
+
+                return List.of(b);
+            }
+           
+        };
+    }
+
 }
diff --git a/src/test/java/it/cnr/isti/workflow/manager/blocks/BlockTest.java b/src/test/java/it/cnr/isti/workflow/manager/blocks/BlockTest.java
index c1931e7..7d0217d 100644
--- a/src/test/java/it/cnr/isti/workflow/manager/blocks/BlockTest.java
+++ b/src/test/java/it/cnr/isti/workflow/manager/blocks/BlockTest.java
@@ -7,6 +7,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.context.annotation.Import;
+import org.springframework.test.context.ActiveProfiles;
 
 import it.cnr.isti.workflow.manager.MyTestConfiguration;
 import it.cnr.isti.workflow.manager.blocks.configurations.LLMBlockConfiguration;
@@ -23,7 +24,7 @@ public class BlockTest {
     @Autowired
     LLMBlockFactory llmBlockFactory;
 
-    @Qualifier("brickTestManager")
+    @Qualifier("llmBrickTestManager")
     @Autowired
     BrickManager<LLMBrick> llmBrickManager;
 
@@ -34,7 +35,7 @@ public class BlockTest {
     @Test
     void createLLMBlock() {
         BlockFactory<LLMBlockType, LLMBlockConfiguration> factory = llmBlockFactory;
-        LLMBrick brick = llmBrickManager.getBricks().getFirst();
+        LLMBrick brick = (LLMBrick) llmBrickManager.getBricks().getFirst();
         assertNotNull(factory);
         assertNotNull(brick);
         // Assuming LLMBlockConfiguration is a valid configuration class for
@@ -44,7 +45,7 @@ public class BlockTest {
                 .brick(brick)
                 .name("master")
                 .build();
-        Block<LLMBlockType, LLMBlockConfiguration> block = factory.create(config);
+        Block<LLMBlockType> block = factory.create(config);
         System.out.println("Created block: " + block);
 
     }
diff --git a/src/test/java/it/cnr/isti/workflow/manager/controllers/BlocksControllerTest.java b/src/test/java/it/cnr/isti/workflow/manager/controllers/BlocksControllerTest.java
index 11a604a..44dd6c8 100644
--- a/src/test/java/it/cnr/isti/workflow/manager/controllers/BlocksControllerTest.java
+++ b/src/test/java/it/cnr/isti/workflow/manager/controllers/BlocksControllerTest.java
@@ -11,7 +11,6 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.context.annotation.Import;
-import org.springframework.test.context.ActiveProfiles;
 
 import it.cnr.isti.workflow.manager.MyTestConfiguration;
 import it.cnr.isti.workflow.manager.blocks.Block;
@@ -23,11 +22,10 @@ import it.cnr.isti.workflow.manager.bricks.LLMBrick;
 
 @SpringBootTest
 @Import(MyTestConfiguration.class)
-@ActiveProfiles("test")
 public class BlocksControllerTest {
 
 
-    @Qualifier("brickTestManager")
+    @Qualifier("llmBrickTestManager")
     @Autowired
     BrickManager<LLMBrick> llmBrickManager;
 
@@ -51,7 +49,7 @@ public class BlocksControllerTest {
                      .name("master")
                      .brick(llmBrickManager.getBricks().get(0))
                      .build();
-        Block<LLMBlockType, LLMBlockConfiguration> block = blocksController.create(config);
+        Block<LLMBlockType> block = blocksController.create(config);
         assertNotNull(block);
         assertTrue(block.getInputs().size() == 1);
         assertTrue(block.getInputs().getFirst().equals("name"));
diff --git a/src/test/java/it/cnr/isti/workflow/manager/controllers/BricksControllerTest.java b/src/test/java/it/cnr/isti/workflow/manager/controllers/BricksControllerTest.java
index 4ee0b79..e0ea1a0 100644
--- a/src/test/java/it/cnr/isti/workflow/manager/controllers/BricksControllerTest.java
+++ b/src/test/java/it/cnr/isti/workflow/manager/controllers/BricksControllerTest.java
@@ -17,7 +17,6 @@ import java.util.List;
 
 @SpringBootTest()
 @Import(MyTestConfiguration.class)
-@ActiveProfiles("test")
 public class BricksControllerTest {
 
     @Autowired