diff --git a/backend/configuration.yml b/backend/configuration.yml
index 35f86dc..f6f2ad8 100644
--- a/backend/configuration.yml
+++ b/backend/configuration.yml
@@ -3,7 +3,7 @@ database:
   driverClass: org.h2.Driver
 
   # the JDBC URL
-  url: jdbc:h2:./sampledatabase.db
+  url: jdbc:h2:file:./sampledatabase.db
 
   # any properties specific to your JDBC driver:
   properties:
@@ -17,4 +17,4 @@ server:
     - type: console
       queueSize: 2048
 
-adminPassword: "testPassword"
\ No newline at end of file
+adminPassword: "testPassword"
diff --git a/backend/src/main/java/uk/co/neviyn/Observations/core/Observation.java b/backend/src/main/java/uk/co/neviyn/Observations/core/Observation.java
index d96716b..b6d7864 100644
--- a/backend/src/main/java/uk/co/neviyn/Observations/core/Observation.java
+++ b/backend/src/main/java/uk/co/neviyn/Observations/core/Observation.java
@@ -11,7 +11,6 @@ import java.io.Serializable;
 import java.util.List;
 import java.util.Set;
 
-@ToString(callSuper = true)
 @Entity
 @Table(name = "OBSERVATION")
 @Data
@@ -27,13 +26,13 @@ public class Observation implements Serializable {
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private long id;
 
-  @JsonProperty
   @ManyToOne
   @JoinColumn(name="site_id", nullable=false)
+  @EqualsAndHashCode.Exclude
   private Site site;
 
-  @JsonProperty
   @ManyToMany(mappedBy = "observations")
+  @EqualsAndHashCode.Exclude
   private Set<Tutor> tutors;
 
   @NonNull
diff --git a/backend/src/main/java/uk/co/neviyn/Observations/core/Site.java b/backend/src/main/java/uk/co/neviyn/Observations/core/Site.java
index 60fd954..7f42e74 100644
--- a/backend/src/main/java/uk/co/neviyn/Observations/core/Site.java
+++ b/backend/src/main/java/uk/co/neviyn/Observations/core/Site.java
@@ -1,20 +1,21 @@
 package uk.co.neviyn.Observations.core;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import lombok.*;
 
 import javax.persistence.*;
 import java.io.Serializable;
 import java.util.Set;
 
-@EqualsAndHashCode
-@ToString
 @Entity
 @Table(name = "SITE")
 @Data
 @NoArgsConstructor
 @Builder
 @AllArgsConstructor
+@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
 public class Site implements Serializable {
 
   @NonNull
@@ -27,12 +28,11 @@ public class Site implements Serializable {
   @JsonProperty
   private String name;
 
-  @JsonProperty
   @OneToMany(mappedBy="site")
+  @EqualsAndHashCode.Exclude
   private Set<Tutor> tutors;
 
-  @JsonProperty
   @OneToMany(mappedBy = "site")
+  @EqualsAndHashCode.Exclude
   private Set<Observation> observations;
-
 }
diff --git a/backend/src/main/java/uk/co/neviyn/Observations/core/Tutor.java b/backend/src/main/java/uk/co/neviyn/Observations/core/Tutor.java
index 423f1ef..e15c3bc 100644
--- a/backend/src/main/java/uk/co/neviyn/Observations/core/Tutor.java
+++ b/backend/src/main/java/uk/co/neviyn/Observations/core/Tutor.java
@@ -1,19 +1,21 @@
 package uk.co.neviyn.Observations.core;
 
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
 import lombok.*;
 
 import javax.persistence.*;
 import java.io.Serializable;
 import java.util.Set;
 
-@ToString
 @Entity
 @Table(name = "TUTOR")
 @Data
 @NoArgsConstructor
 @AllArgsConstructor
 @Builder
+@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
 public class Tutor implements Serializable {
 
   @NonNull
@@ -26,17 +28,17 @@ public class Tutor implements Serializable {
   @JsonProperty
   private String name;
 
-  @JsonProperty
   @ManyToOne
   @JoinColumn(name="site_id", nullable=false)
+  @EqualsAndHashCode.Exclude
   private Site site;
 
-  @JsonProperty
   @ManyToMany
   @JoinTable(
       name = "TUTOR_OBSERVATION",
       joinColumns = { @JoinColumn(name = "tutor_id")},
       inverseJoinColumns = { @JoinColumn(name = "observation_id")}
   )
+  @EqualsAndHashCode.Exclude
   private Set<Observation> observations;
 }
diff --git a/backend/src/main/java/uk/co/neviyn/Observations/resources/ObservationResource.java b/backend/src/main/java/uk/co/neviyn/Observations/resources/ObservationResource.java
index 88a50bb..346a5a9 100644
--- a/backend/src/main/java/uk/co/neviyn/Observations/resources/ObservationResource.java
+++ b/backend/src/main/java/uk/co/neviyn/Observations/resources/ObservationResource.java
@@ -37,26 +37,21 @@ public class ObservationResource {
 
   @POST
   @UnitOfWork
-  public long add(@NotNull @Valid NewObservation newObservation){
+  public long add(@NotNull @Valid NewObservation newObservation) {
     final DateTime submissionDate = LocalDate.now().toDateTimeAtStartOfDay();
     Set<Tutor> tutors = new HashSet<>();
-    for(long l: newObservation.getTutorIds()){
+    for (long l : newObservation.getTutorIds()) {
       tutors.add(tutorDao.get(l));
     }
     final Site site = siteDao.get(newObservation.getSiteId());
-    Observation observation = Observation.builder()
-        .site(site)
-        .tutors(tutors)
-        .observed(newObservation.getObserved())
-        .type(TrainingType.valueOf(newObservation.getType()))
-        .monitoring(newObservation.getMonitoring())
-        .control(newObservation.getControl())
-        .conservatism(newObservation.getConservatism())
-        .teamwork(newObservation.getTeamwork())
-        .knowledge(newObservation.getKnowledge())
-        .observations(newObservation.getRawData())
-        .date(submissionDate)
-        .build();
+    Observation observation = Observation.builder().site(site).tutors(tutors).observed(newObservation.getObserved())
+        .type(TrainingType.valueOf(newObservation.getType())).monitoring(newObservation.getMonitoring())
+        .control(newObservation.getControl()).conservatism(newObservation.getConservatism())
+        .teamwork(newObservation.getTeamwork()).knowledge(newObservation.getKnowledge())
+        .observations(newObservation.getRawData()).date(submissionDate).build();
+    for (Tutor t : tutors) {
+      t.getObservations().add(observation);
+    }
     observation = dao.persist(observation);
     log.info("Created observation with ID " + observation.getId() + " at " + DateTime.now().toString());
     return observation.getId();
@@ -64,23 +59,27 @@ public class ObservationResource {
 
   @Path("/average/all")
   @GET
-  public List<AverageStats> averageObservationScores(){
+  @UnitOfWork
+  public List<AverageStats> averageObservationScores() {
     return dao.averageStatsForAll();
   }
 
   @Path("/average/all/chartjs")
   @GET
-  public AverageStatsChartJs averageStatsChartJs(){
+  public AverageStatsChartJs averageStatsChartJs() {
     return new AverageStatsChartJs(averageObservationScores());
   }
 
   @Path("/average/{id}")
+  @GET
+  @UnitOfWork
   public List<AverageStats> averageObservationScoresForSite(@PathParam("id") long siteId) {
     Site site = siteDao.get(siteId);
     return dao.averageStatsForSite(site);
   }
 
   @Path("/average/{id}/chartjs")
+  @GET
   public AverageStatsChartJs averageObservationScoresForSiteChartJs(@PathParam("id") long siteId) {
     return new AverageStatsChartJs(averageObservationScoresForSite(siteId));
   }
diff --git a/backend/src/main/java/uk/co/neviyn/Observations/resources/SiteResource.java b/backend/src/main/java/uk/co/neviyn/Observations/resources/SiteResource.java
index 526c1a0..682a67d 100644
--- a/backend/src/main/java/uk/co/neviyn/Observations/resources/SiteResource.java
+++ b/backend/src/main/java/uk/co/neviyn/Observations/resources/SiteResource.java
@@ -5,14 +5,12 @@ import io.dropwizard.hibernate.UnitOfWork;
 import lombok.RequiredArgsConstructor;
 import uk.co.neviyn.Observations.api.SelectOption;
 import uk.co.neviyn.Observations.core.Site;
-import uk.co.neviyn.Observations.core.Tutor;
 import uk.co.neviyn.Observations.core.User;
 import uk.co.neviyn.Observations.dao.SiteDao;
 
 import javax.ws.rs.*;
 import javax.ws.rs.core.MediaType;
 import java.util.List;
-import java.util.Set;
 import java.util.stream.Collectors;
 
 @RequiredArgsConstructor
@@ -38,7 +36,7 @@ public class SiteResource {
   @Path("/{id}/tutors")
   @GET
   @UnitOfWork
-  public Set<Tutor> getSiteTutors(@PathParam("id") long id){
-    return dao.get(id).getTutors();
+  public List<SelectOption<Long>> getSiteTutors(@PathParam("id") long id) {
+    return dao.get(id).getTutors().stream().map(x -> new SelectOption<>(x.getName(), x.getId())).collect(Collectors.toList());
   }
 }
diff --git a/backend/src/main/java/uk/co/neviyn/Observations/resources/TutorResource.java b/backend/src/main/java/uk/co/neviyn/Observations/resources/TutorResource.java
index 93f0cd8..2f5f4ff 100644
--- a/backend/src/main/java/uk/co/neviyn/Observations/resources/TutorResource.java
+++ b/backend/src/main/java/uk/co/neviyn/Observations/resources/TutorResource.java
@@ -7,6 +7,7 @@ import lombok.AllArgsConstructor;
 import lombok.NoArgsConstructor;
 import lombok.NonNull;
 import lombok.RequiredArgsConstructor;
+import uk.co.neviyn.Observations.core.Observation;
 import uk.co.neviyn.Observations.core.Site;
 import uk.co.neviyn.Observations.core.Tutor;
 import uk.co.neviyn.Observations.core.User;
@@ -17,6 +18,7 @@ import javax.ws.rs.*;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.util.List;
+import java.util.Set;
 
 @RequiredArgsConstructor
 @Produces(MediaType.APPLICATION_JSON)
@@ -31,6 +33,7 @@ public class TutorResource {
   public Tutor add(@Auth User user, NewTutor newTutor) {
     final Site site = siteDao.get(newTutor.siteId);
     final Tutor tutor = Tutor.builder().name(newTutor.name).site(site).build();
+    site.getTutors().add(tutor);
     return dao.persist(tutor);
   }
 
@@ -44,6 +47,13 @@ public class TutorResource {
     throw new WebApplicationException("No tutors found!", Response.Status.NOT_FOUND);
   }
 
+  @Path("/{id}/observations")
+  @GET
+  @UnitOfWork
+  public Set<Observation> getSiteTutors(@PathParam("id") long id) {
+    return dao.get(id).getObservations();
+  }
+
   @AllArgsConstructor
   @NoArgsConstructor
   static class NewTutor {
diff --git a/backend/src/test/java/uk/co/neviyn/Observations/resources/ObservationResourceTest.java b/backend/src/test/java/uk/co/neviyn/Observations/resources/ObservationResourceTest.java
index 341c2b6..708df0e 100644
--- a/backend/src/test/java/uk/co/neviyn/Observations/resources/ObservationResourceTest.java
+++ b/backend/src/test/java/uk/co/neviyn/Observations/resources/ObservationResourceTest.java
@@ -15,6 +15,7 @@ import uk.co.neviyn.Observations.dao.TutorDao;
 import javax.ws.rs.client.Entity;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.HashSet;
 import java.util.List;
 
 import static org.mockito.Mockito.*;
@@ -40,7 +41,7 @@ public class ObservationResourceTest {
   @Test
   public void add() {
     final Site testSite = Site.builder().id(1).name("Test Site").build();
-    final List<Tutor> tutors = Arrays.asList(Tutor.builder().id(1).name("Mr A").build(), Tutor.builder().id(2).name("Mr B").build());
+    final List<Tutor> tutors = Arrays.asList(Tutor.builder().id(1).name("Mr A").observations(new HashSet<>()).build(), Tutor.builder().id(2).name("Mr B").observations(new HashSet<>()).build());
     when(siteDao.get(1)).thenReturn(testSite);
     when(tutorDao.get(1)).thenReturn(tutors.get(0));
     when(tutorDao.get(2)).thenReturn(tutors.get(1));
diff --git a/backend/src/test/java/uk/co/neviyn/Observations/resources/SiteResourceTest.java b/backend/src/test/java/uk/co/neviyn/Observations/resources/SiteResourceTest.java
index 3477708..bb07552 100644
--- a/backend/src/test/java/uk/co/neviyn/Observations/resources/SiteResourceTest.java
+++ b/backend/src/test/java/uk/co/neviyn/Observations/resources/SiteResourceTest.java
@@ -50,7 +50,7 @@ public class SiteResourceTest {
   @Test
   public void add() {
     resources.target("/site").request().header("Authorization", httpAuth).post(Entity.json("New Site"));
-    verify(dao, times(1)).persist(Site.builder().name("New Site").build());
+    verify(dao, times(1)).persist(Site.builder().name("New Site").tutors(new HashSet<>()).build());
   }
 
   @Test
@@ -66,9 +66,9 @@ public class SiteResourceTest {
   public void getSiteTutors() {
     Set<Tutor> tutors = new HashSet<>(Arrays.asList(Tutor.builder().id(1).name("Test 1").build(), Tutor.builder().id(2).name("Test 2").build()));
     when(dao.get(1)).thenReturn(Site.builder().id(1).name("Site").tutors(tutors).build());
-    Set<Tutor> result = resources.target("/site/1/tutors").request().get(new GenericType<Set<Tutor>>() {
+    List<SelectOption<Long>> result = resources.target("/site/1/tutors").request().get(new GenericType<List<SelectOption<Long>>>() {
     });
     assertNotNull(result);
-    assertEquals(tutors, result);
+    assertEquals(2, result.size());
   }
 }
\ No newline at end of file
diff --git a/backend/src/test/java/uk/co/neviyn/Observations/resources/TutorResourceTest.java b/backend/src/test/java/uk/co/neviyn/Observations/resources/TutorResourceTest.java
index a8ee81c..bb8a48b 100644
--- a/backend/src/test/java/uk/co/neviyn/Observations/resources/TutorResourceTest.java
+++ b/backend/src/test/java/uk/co/neviyn/Observations/resources/TutorResourceTest.java
@@ -17,6 +17,7 @@ import uk.co.neviyn.Observations.dao.TutorDao;
 import javax.ws.rs.client.Entity;
 import javax.ws.rs.core.GenericType;
 import java.util.Arrays;
+import java.util.HashSet;
 import java.util.List;
 
 import static org.junit.Assert.assertTrue;
@@ -48,7 +49,7 @@ public class TutorResourceTest {
 
   @Test
   public void add() {
-    final Site testSite = Site.builder().id(1).name("Test Site").build();
+    final Site testSite = Site.builder().id(1).name("Test Site").tutors(new HashSet<>()).build();
     when(siteDao.get(1)).thenReturn(testSite);
     resources.target("/tutor").request().header("Authorization", httpAuth).post(Entity.json(new TutorResource.NewTutor(1, "Mr X")));
     verify(dao, times(1)).persist(Tutor.builder().name("Mr X").site(testSite).build());