diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/AccountModel.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/AccountModel.kt
index 7c2a7d0..00a23cc 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/AccountModel.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/AccountModel.kt
@@ -23,33 +23,42 @@ private const val EMPLOYEE_PASSWORD_EMPTY_MESSAGE = "Un mot de passe est requis"
 private const val EMPLOYEE_PASSWORD_TOO_SHORT_MESSAGE = "Le mot de passe doit contenir au moins 8 caractères"
 
 @Entity
+@Table(name = "employee")
 data class Employee(
     @Id
     override val id: Long,
 
+    @Column(name = "first_name")
     val firstName: String = "",
 
+    @Column(name = "last_name")
     val lastName: String = "",
 
     @JsonIgnore
     val password: String = "",
 
     @JsonIgnore
+    @Column(name = "default_group_user")
     val isDefaultGroupUser: Boolean = false,
 
     @JsonIgnore
+    @Column(name = "system_user")
     val isSystemUser: Boolean = false,
 
-    @field:ManyToOne
+    @ManyToOne
+    @JoinColumn(name = "group_id")
     @Fetch(FetchMode.SELECT)
     var group: EmployeeGroup? = null,
 
     @Enumerated(EnumType.STRING)
     @ElementCollection(fetch = FetchType.EAGER)
+    @CollectionTable(name = "employee_permission", joinColumns = [JoinColumn(name = "employee_id")])
+    @Column(name = "permission")
     @Fetch(FetchMode.SUBSELECT)
     @get:JsonIgnore
     val permissions: MutableSet<EmployeePermission> = mutableSetOf(),
 
+    @Column(name = "last_login_time")
     var lastLoginTime: LocalDateTime? = null
 ) : Model {
     @JsonProperty("permissions")
@@ -119,6 +128,7 @@ private const val GROUP_NAME_NULL_MESSAGE = "Un nom est requis"
 private const val GROUP_PERMISSIONS_EMPTY_MESSAGE = "Au moins une permission est requise"
 
 @Entity
+@Table(name = "employee_group")
 data class EmployeeGroup(
     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
@@ -129,9 +139,12 @@ data class EmployeeGroup(
 
     @Enumerated(EnumType.STRING)
     @ElementCollection(fetch = FetchType.EAGER)
+    @CollectionTable(name = "group_permission", joinColumns = [JoinColumn(name = "group_id")])
+    @Column(name = "permission")
+    @Fetch(FetchMode.SUBSELECT)
     val permissions: MutableSet<EmployeePermission> = mutableSetOf(),
 
-    @OneToMany
+    @OneToMany(mappedBy = "group")
     @JsonIgnore
     val employees: MutableSet<Employee> = mutableSetOf()
 ) : NamedModel {
diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Company.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Company.kt
index b971530..fb45019 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Company.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Company.kt
@@ -10,6 +10,7 @@ private const val COMPANY_ID_NULL_MESSAGE = "Un identifiant est requis"
 private const val COMPANY_NAME_NULL_MESSAGE = "Un nom est requis"
 
 @Entity
+@Table(name = "company")
 data class Company(
         @Id
         @GeneratedValue(strategy = GenerationType.SEQUENCE)
diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Material.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Material.kt
index a37379c..c97b836 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Material.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Material.kt
@@ -18,22 +18,33 @@ private const val MATERIAL_INVENTORY_QUANTITY_NEGATIVE_MESSAGE = "La quantité d
 private const val MATERIAL_TYPE_NULL_MESSAGE = "Un type de produit est requis"
 
 @Entity
+@Table(name = "material")
 data class Material(
-        @Id
-        @GeneratedValue(strategy = GenerationType.SEQUENCE)
-        override val id: Long?,
+    @Id
+    @GeneratedValue(strategy = GenerationType.SEQUENCE)
+    override val id: Long?,
 
-        @Column(unique = true)
-        override var name: String,
+    @Column(unique = true)
+    override var name: String,
 
-        var inventoryQuantity: Float,
+    @Column(name = "inventory_quantity")
+    var inventoryQuantity: Float,
 
-        val isMixType: Boolean,
+    @Column(name = "mix_type")
+    val isMixType: Boolean,
 
-        @ManyToOne
-        var materialType: MaterialType?
+    @ManyToOne
+    @JoinColumn(name = "material_type_id")
+    var materialType: MaterialType?
 ) : NamedModel {
-    constructor(name: String, inventoryQuantity: Float, isMixType: Boolean, materialType: MaterialType) : this(null, name, inventoryQuantity, isMixType, materialType)
+    constructor(name: String, inventoryQuantity: Float, isMixType: Boolean, materialType: MaterialType) : this(
+        null,
+        name,
+        inventoryQuantity,
+        isMixType,
+        materialType
+    )
+
     constructor() : this(null, "", 0f, false, null)
 
     override fun equals(other: Any?): Boolean = other is Material && name == other.name
@@ -41,48 +52,50 @@ data class Material(
 }
 
 open class MaterialSaveDto(
-        @field:NotBlank(message = MATERIAL_NAME_NULL_MESSAGE)
-        val name: String,
+    @field:NotBlank(message = MATERIAL_NAME_NULL_MESSAGE)
+    val name: String,
 
-        @field:NotNull(message = MATERIAL_INVENTORY_QUANTITY_NULL_MESSAGE)
-        @field:Min(value = 0, message = MATERIAL_INVENTORY_QUANTITY_NEGATIVE_MESSAGE)
-        val inventoryQuantity: Float,
+    @field:NotNull(message = MATERIAL_INVENTORY_QUANTITY_NULL_MESSAGE)
+    @field:Min(value = 0, message = MATERIAL_INVENTORY_QUANTITY_NEGATIVE_MESSAGE)
+    val inventoryQuantity: Float,
 
-        @field:NotNull(message = MATERIAL_TYPE_NULL_MESSAGE)
-        val materialType: MaterialType,
+    @field:NotNull(message = MATERIAL_TYPE_NULL_MESSAGE)
+    val materialType: MaterialType,
 
-        val simdutFile: MultipartFile? = null
+    val simdutFile: MultipartFile? = null
 ) : EntityDto<Material> {
     override fun toEntity(): Material = Material(null, name, inventoryQuantity, false, materialType)
     fun toMaterial() = toEntity()
 }
 
 open class MaterialUpdateDto(
-        @field:NotNull(message = MATERIAL_ID_NULL_MESSAGE)
-        val id: Long,
+    @field:NotNull(message = MATERIAL_ID_NULL_MESSAGE)
+    val id: Long,
 
-        @field:NullOrNotBlank(message = MATERIAL_NAME_NULL_MESSAGE)
-        val name: String?,
+    @field:NullOrNotBlank(message = MATERIAL_NAME_NULL_MESSAGE)
+    val name: String?,
 
-        @field:NullOrSize(min = 0, message = MATERIAL_INVENTORY_QUANTITY_NEGATIVE_MESSAGE)
-        val inventoryQuantity: Float?,
+    @field:NullOrSize(min = 0, message = MATERIAL_INVENTORY_QUANTITY_NEGATIVE_MESSAGE)
+    val inventoryQuantity: Float?,
 
-        val materialType: MaterialType?,
+    val materialType: MaterialType?,
 
-        val simdutFile: MultipartFile? = null
+    val simdutFile: MultipartFile? = null
 ) : EntityDto<Material> {
-    override fun toEntity(): Material = Material(id, name ?: "", inventoryQuantity
-            ?: Float.MIN_VALUE, false, materialType)
+    override fun toEntity(): Material = Material(
+        id, name ?: "", inventoryQuantity
+            ?: Float.MIN_VALUE, false, materialType
+    )
 
     fun toMaterial() = toEntity()
 }
 
 data class InventoryMaterial(
-        @NotNull val id: Long,
-        @NotNull val name: String,
-        @NotNull val inventoryQuantity: Float,
-        @NotNull val materialTypeName: String,
-        @NotNull val lowQuantity: Boolean = false
+    @NotNull val id: Long,
+    @NotNull val name: String,
+    @NotNull val inventoryQuantity: Float,
+    @NotNull val materialTypeName: String,
+    @NotNull val lowQuantity: Boolean = false
 )
 
 fun Material.toInventoryMaterial(minimumQuantity: Float): InventoryMaterial {
@@ -94,34 +107,36 @@ fun Material.toInventoryMaterial(minimumQuantity: Float): InventoryMaterial {
 
 // ==== DSL ====
 fun material(
-        id: Long? = null,
-        name: String = "name",
-        inventoryQuantity: Float = 0f,
-        isMixType: Boolean = false,
-        materialType: MaterialType? = materialType(),
-        op: Material.() -> Unit = {}
+    id: Long? = null,
+    name: String = "name",
+    inventoryQuantity: Float = 0f,
+    isMixType: Boolean = false,
+    materialType: MaterialType? = materialType(),
+    op: Material.() -> Unit = {}
 ) = Material(id, name, inventoryQuantity, isMixType, materialType).apply(op)
 
 fun material(
-        material: Material,
-        id: Long? = null,
-        name: String? = null,
-) = Material(id ?: material.id, name
-        ?: material.name, material.inventoryQuantity, material.isMixType, material.materialType)
+    material: Material,
+    id: Long? = null,
+    name: String? = null,
+) = Material(
+    id ?: material.id, name
+        ?: material.name, material.inventoryQuantity, material.isMixType, material.materialType
+)
 
 fun materialSaveDto(
-        name: String = "name",
-        inventoryQuantity: Float = 0f,
-        materialType: MaterialType = materialType(),
-        simdutFile: MultipartFile? = null,
-        op: MaterialSaveDto.() -> Unit = {}
+    name: String = "name",
+    inventoryQuantity: Float = 0f,
+    materialType: MaterialType = materialType(),
+    simdutFile: MultipartFile? = null,
+    op: MaterialSaveDto.() -> Unit = {}
 ) = MaterialSaveDto(name, inventoryQuantity, materialType, simdutFile).apply(op)
 
 fun materialUpdateDto(
-        id: Long = 0L,
-        name: String? = "name",
-        inventoryQuantity: Float? = 0f,
-        materialType: MaterialType? = materialType(),
-        simdutFile: MultipartFile? = null,
-        op: MaterialUpdateDto.() -> Unit = {}
+    id: Long = 0L,
+    name: String? = "name",
+    inventoryQuantity: Float? = 0f,
+    materialType: MaterialType? = materialType(),
+    simdutFile: MultipartFile? = null,
+    op: MaterialUpdateDto.() -> Unit = {}
 ) = MaterialUpdateDto(id, name, inventoryQuantity, materialType, simdutFile).apply(op)
diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MaterialType.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MaterialType.kt
index 2487102..3d5d281 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MaterialType.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MaterialType.kt
@@ -17,82 +17,93 @@ private const val MATERIAL_TYPE_PREFIX_SIZE_MESSAGE = "Le préfixe doit faire ex
 const val IDENTIFIER_PREFIX_NAME = "prefix"
 
 @Entity
+@Table(name = "material_type")
 data class MaterialType(
-        @Id
-        @GeneratedValue(strategy = GenerationType.SEQUENCE)
-        override val id: Long? = null,
+    @Id
+    @GeneratedValue(strategy = GenerationType.SEQUENCE)
+    override val id: Long? = null,
 
-        @Column(unique = true)
-        override val name: String = "",
+    @Column(unique = true)
+    override val name: String = "",
 
-        @Column(unique = true)
-        val prefix: String = "",
+    @Column(unique = true)
+    val prefix: String = "",
 
-        @ColumnDefault("false")
-        val usePercentages: Boolean = false,
+    @Column(name = "use_percentages")
+    @ColumnDefault("false")
+    val usePercentages: Boolean = false,
 
-        @ColumnDefault("false")
-        val systemType: Boolean = false
+    @Column(name = "system_type")
+    @ColumnDefault("false")
+    val systemType: Boolean = false
 ) : NamedModel {
     override fun equals(other: Any?): Boolean = other is MaterialType && name == other.name && prefix == other.prefix
     override fun hashCode(): Int = Objects.hash(name, prefix)
 }
 
 open class MaterialTypeSaveDto(
-        @field:NotBlank(message = MATERIAL_TYPE_NAME_NULL_MESSAGE)
-        val name: String,
+    @field:NotBlank(message = MATERIAL_TYPE_NAME_NULL_MESSAGE)
+    val name: String,
 
-        @field:NotBlank(message = MATERIAL_TYPE_PREFIX_NULL_MESSAGE)
-        @field:Size(min = 3, max = 3, message = MATERIAL_TYPE_PREFIX_SIZE_MESSAGE)
-        val prefix: String,
+    @field:NotBlank(message = MATERIAL_TYPE_PREFIX_NULL_MESSAGE)
+    @field:Size(min = 3, max = 3, message = MATERIAL_TYPE_PREFIX_SIZE_MESSAGE)
+    val prefix: String,
 
-        val usePercentages: Boolean = false
+    val usePercentages: Boolean = false
 ) : EntityDto<MaterialType> {
     override fun toEntity(): MaterialType =
-            MaterialType(null, name, prefix, usePercentages)
+        MaterialType(null, name, prefix, usePercentages)
 }
 
 open class MaterialTypeUpdateDto(
-        @field:NotNull(message = MATERIAL_TYPE_ID_NULL_MESSAGE)
-        val id: Long,
+    @field:NotNull(message = MATERIAL_TYPE_ID_NULL_MESSAGE)
+    val id: Long,
 
-        @field:NullOrNotBlank(message = MATERIAL_TYPE_NAME_NULL_MESSAGE)
-        val name: String?,
+    @field:NullOrNotBlank(message = MATERIAL_TYPE_NAME_NULL_MESSAGE)
+    val name: String?,
 
-        @field:NullOrSize(min = 3, max = 3, message = MATERIAL_TYPE_PREFIX_NULL_MESSAGE)
-        val prefix: String?
+    @field:NullOrSize(min = 3, max = 3, message = MATERIAL_TYPE_PREFIX_NULL_MESSAGE)
+    val prefix: String?
 ) : EntityDto<MaterialType> {
     override fun toEntity(): MaterialType =
-            MaterialType(id, name ?: "", prefix ?: "")
+        MaterialType(id, name ?: "", prefix ?: "")
 }
 
 // ==== DSL ====
 fun materialType(
-        id: Long? = null,
-        name: String = "name",
-        prefix: String = "PRE",
-        usePercentages: Boolean = false,
-        systemType: Boolean = false,
-        op: MaterialType.() -> Unit = {}
+    id: Long? = null,
+    name: String = "name",
+    prefix: String = "PRE",
+    usePercentages: Boolean = false,
+    systemType: Boolean = false,
+    op: MaterialType.() -> Unit = {}
 ) = MaterialType(id, name, prefix, usePercentages, systemType).apply(op)
 
 fun materialType(
-        materialType: MaterialType,
-        newId: Long? = null,
-        newName: String? = null,
-        newSystemType: Boolean? = null
-) = with(materialType) { MaterialType(newId ?: id, newName ?: name, prefix, usePercentages, newSystemType ?: systemType) }
+    materialType: MaterialType,
+    newId: Long? = null,
+    newName: String? = null,
+    newSystemType: Boolean? = null
+) = with(materialType) {
+    MaterialType(
+        newId ?: id,
+        newName ?: name,
+        prefix,
+        usePercentages,
+        newSystemType ?: systemType
+    )
+}
 
 fun materialTypeSaveDto(
-        name: String = "name",
-        prefix: String = "PRE",
-        usePercentages: Boolean = false,
-        op: MaterialTypeSaveDto.() -> Unit = {}
+    name: String = "name",
+    prefix: String = "PRE",
+    usePercentages: Boolean = false,
+    op: MaterialTypeSaveDto.() -> Unit = {}
 ) = MaterialTypeSaveDto(name, prefix, usePercentages).apply(op)
 
 fun materialTypeUpdateDto(
-        id: Long = 0L,
-        name: String? = null,
-        prefix: String? = null,
-        op: MaterialTypeUpdateDto.() -> Unit = {}
+    id: Long = 0L,
+    name: String? = null,
+    prefix: String? = null,
+    op: MaterialTypeUpdateDto.() -> Unit = {}
 ) = MaterialTypeUpdateDto(id, name, prefix).apply(op)
diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Mix.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Mix.kt
index 0b9f74a..fff6cfe 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Mix.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Mix.kt
@@ -15,6 +15,7 @@ private const val MIX_RECIPE_NULL_MESSAGE = "Un recette est requise"
 private const val MIX_MATERIAL_TYPE_NULL_MESSAGE = "Un type de prodsuit est requis"
 
 @Entity
+@Table(name = "mix")
 data class Mix(
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE)
@@ -24,12 +25,14 @@ data class Mix(
 
     @JsonIgnore
     @ManyToOne
+    @JoinColumn(name = "recipe_id")
     val recipe: Recipe,
 
     @ManyToOne
+    @JoinColumn(name = "mix_type_id")
     var mixType: MixType,
 
-    @OneToMany(cascade = [CascadeType.ALL])
+    @OneToMany(cascade = [CascadeType.ALL], mappedBy = "mix")
     var mixMaterials: MutableCollection<MixMaterial>,
 ) : Model {
     constructor(recipe: Recipe, mixType: MixType) : this(null, null, recipe, mixType, mutableListOf())
diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MixMaterial.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MixMaterial.kt
index b73cadf..af91cac 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MixMaterial.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MixMaterial.kt
@@ -5,6 +5,7 @@ import java.util.*
 import javax.persistence.*
 
 @Entity
+@Table(name = "mix_material")
 data class MixMaterial(
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE)
@@ -12,9 +13,11 @@ data class MixMaterial(
 
     @JsonIgnore
     @ManyToOne
+    @JoinColumn(name = "mix_id")
     val mix: Mix,
 
     @ManyToOne
+    @JoinColumn(name = "material_id")
     val material: Material,
 
     val quantity: Float
diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MixType.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MixType.kt
index 92d8cb9..5c23056 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MixType.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/MixType.kt
@@ -6,6 +6,7 @@ import javax.persistence.*
 const val IDENTIFIER_MATERIAL_NAME = "material"
 
 @Entity
+@Table(name = "mix_type")
 data class MixType(
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE)
@@ -15,6 +16,7 @@ data class MixType(
     override var name: String,
 
     @OneToOne(cascade = [CascadeType.ALL])
+    @JoinColumn(name = "material_id")
     var material: Material
 ) : NamedModel {
     constructor(name: String, material: Material) : this(null, name, material)
diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Recipe.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Recipe.kt
index 17f894f..a8a6763 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Recipe.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/Recipe.kt
@@ -18,6 +18,7 @@ private const val RECIPE_SAMPLE_TOO_SMALL_MESSAGE = "Le numéro d'échantillon d
 private const val RECIPE_COMPANY_NULL_MESSAGE = "Une bannière est requise"
 
 @Entity
+@Table(name = "recipe")
 data class Recipe(
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE)
@@ -30,6 +31,7 @@ data class Recipe(
 
     val sample: Int,
 
+    @Column(name = "approbation_date")
     val approbationDate: LocalDate?,
 
     /** A remark given by the creator of the recipe. */
@@ -39,12 +41,13 @@ data class Recipe(
     var note: String,
 
     @ManyToOne
+    @JoinColumn(name = "company_id")
     val company: Company,
 
-    @OneToMany(cascade = [CascadeType.ALL])
+    @OneToMany(cascade = [CascadeType.ALL], mappedBy = "recipe")
     val mixes: MutableCollection<Mix>,
 
-    @OneToMany(cascade = [CascadeType.ALL])
+    @OneToMany(cascade = [CascadeType.ALL], mappedBy = "recipe")
     var steps: MutableCollection<RecipeStep>
 ) : Model {
     constructor(
diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/RecipeStep.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/RecipeStep.kt
index 40cd5cf..15f356c 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/RecipeStep.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/model/RecipeStep.kt
@@ -7,6 +7,7 @@ import javax.persistence.*
 import javax.validation.constraints.NotNull
 
 @Entity
+@Table(name = "recipe_step")
 data class RecipeStep(
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE)
@@ -14,6 +15,7 @@ data class RecipeStep(
 
     @JsonIgnore
     @ManyToOne
+    @JoinColumn(name = "recipe_id")
     val recipe: Recipe?,
 
     val message: String
diff --git a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/service/RecipeService.kt b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/service/RecipeService.kt
index 62e8cbc..27ce618 100644
--- a/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/service/RecipeService.kt
+++ b/src/main/kotlin/dev/fyloz/trial/colorrecipesexplorer/service/RecipeService.kt
@@ -69,7 +69,7 @@ class RecipeServiceImpl(
                 note = persistedRecipe.note,
                 company = persistedRecipe.company,
                 mixes = persistedRecipe.mixes,
-                steps = steps?.toMutableList() ?: persistedRecipe.steps
+                steps = steps?.map { recipeStep(recipe = persistedRecipe, message = it.message) }?.toMutableList() ?: persistedRecipe.steps
             )
         })
     }