diff --git a/persistence/scripts/mysql/local_development.sql b/persistence/scripts/mysql/local_development.sql
index 87186c4..6051486 100644
--- a/persistence/scripts/mysql/local_development.sql
+++ b/persistence/scripts/mysql/local_development.sql
@@ -36,7 +36,6 @@ version int default 1
 CREATE TABLE proofs
 (
   id                       INT NOT NULL AUTO_INCREMENT,
-  username                 VARCHAR(50) NOT NULL,
   branch                   VARCHAR(512) NOT NULL,
   referenced_definitions   JSON,
   referenced_theorems      JSON,
diff --git a/persistence/src/main/java/edu/msudenver/tsp/persistence/dto/ProofDto.java b/persistence/src/main/java/edu/msudenver/tsp/persistence/dto/ProofDto.java
index 195340e..3bf2579 100644
--- a/persistence/src/main/java/edu/msudenver/tsp/persistence/dto/ProofDto.java
+++ b/persistence/src/main/java/edu/msudenver/tsp/persistence/dto/ProofDto.java
@@ -1,4 +1,77 @@
 package edu.msudenver.tsp.persistence.dto;
 
-public class ProofDto extends BaseDto {
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import org.hibernate.annotations.Type;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import javax.persistence.*;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Size;
+import java.io.Serializable;
+import java.util.Date;
+
+@Entity(name = "proofs")
+@EntityListeners(AuditingEntityListener.class)
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class ProofDto extends BaseDto implements Serializable {
+    @NotBlank(groups = Insert.class)
+    @Size(min = 1, max = 512, message = "The branch must be at least 1 character and at most 512 characters")
+    private String branch;
+    @Type(type = "json") @Column(name = "referenced_definitions", columnDefinition = "jsonb") private String referencedDefinitions;
+    @Type(type = "json") @Column(name = "referenced_theorems", columnDefinition = "jsonb") private String referencedTheorems;
+    @Temporal(TemporalType.DATE) @Column(name = "date_created") private Date dateCreated;
+    @Temporal(TemporalType.DATE) @Column(name = "last_updated") private Date lastUpdated;
+
+
+    @JsonProperty("referenced_definitions")
+    public String getReferencedDefinitions() {
+        return referencedDefinitions;
+    }
+
+    @JsonProperty("referenced_definitions")
+    public void setReferencedDefinitions(final String referencedDefinitions) {
+        this.referencedDefinitions = referencedDefinitions;
+    }
+
+    @JsonProperty("referenced_theorems")
+    public String getReferencedTheorems() {
+        return referencedTheorems;
+    }
+
+    @JsonProperty("referenced_theorems")
+    public void setReferencedTheorems(final String referencedTheorems) {
+        this.referencedTheorems = referencedTheorems;
+    }
+
+    @JsonProperty("date_created")
+    public Date getDateCreated() {
+        return dateCreated;
+    }
+
+    @JsonProperty("date_created")
+    public void setDateCreated(final Date dateCreated) {
+        this.dateCreated = dateCreated;
+    }
+
+    @JsonProperty("last_updated")
+    public Date getLastUpdated() {
+        return lastUpdated;
+    }
+
+    @JsonProperty("last_updated")
+    public void setLastUpdated(final Date lastUpdated) {
+        this.lastUpdated = lastUpdated;
+    }
+
+    @PrePersist
+    public void prePersist() {
+        lastUpdated = new Date();
+    }
+
+    private static final long serialVersionUID = -7731220940349760402L;
+
+    public interface Insert {}
 }
diff --git a/persistence/src/main/java/edu/msudenver/tsp/persistence/repository/ProofRepository.java b/persistence/src/main/java/edu/msudenver/tsp/persistence/repository/ProofRepository.java
index 8466bbb..134897f 100644
--- a/persistence/src/main/java/edu/msudenver/tsp/persistence/repository/ProofRepository.java
+++ b/persistence/src/main/java/edu/msudenver/tsp/persistence/repository/ProofRepository.java
@@ -1,7 +1,7 @@
 package edu.msudenver.tsp.persistence.repository;
 
 import edu.msudenver.tsp.persistence.dto.BaseDto;
-import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.jpa.repository.JpaRepository;
 
-public interface ProofRepository extends CrudRepository<BaseDto, Long> {
+public interface ProofRepository extends JpaRepository<BaseDto, Integer> {
 }