diff --git a/back/src/Guide/Api/Types.hs b/back/src/Guide/Api/Types.hs
index 843bf9a..eaa1bc5 100644
--- a/back/src/Guide/Api/Types.hs
+++ b/back/src/Guide/Api/Types.hs
@@ -265,7 +265,7 @@ data TraitSite route = TraitSite
   deriving (Generic)
 
 -- | Site-wide search
-data SearchSite route = SearchSite
+newtype SearchSite route = SearchSite
   { _search :: route :-
       Summary "Search categories and items"
       :> Description "Note: returns at most 100 search results."
@@ -344,7 +344,7 @@ instance ToSchema CCreateTrait where
   declareNamedSchema = genericDeclareNamedSchema schemaOptions
 
 -- | Client type to move trait or item up or down.
-data CMove = CMove
+newtype CMove = CMove
   { cmDirection :: CDirection
   } deriving (Show, Eq, Generic)
 
@@ -360,7 +360,7 @@ instance ToSchema CMove where
 -- | A "light-weight" client type of 'Category', which describes a category
 -- but doesn't give the notes or the items.
 data CCategoryInfo = CCategoryInfo
-  { cciUid     :: Uid Category
+  { cciId      :: Uid Category
   , cciTitle   :: Text           ? "Category title"
   , cciCreated :: UTCTime        ? "When the category was created"
   , cciGroup_  :: Text           ? "Category group ('grandcategory')"
@@ -377,17 +377,17 @@ instance ToSchema CCategoryInfo where
 -- | Factory to create a 'CCategoryInfo' from a 'Category'
 toCCategoryInfo :: Category -> CCategoryInfo
 toCCategoryInfo Category{..} = CCategoryInfo
-  { cciUid     = _categoryUid
-  , cciTitle   = H $ _categoryTitle
-  , cciCreated = H $ _categoryCreated
-  , cciGroup_  = H $ _categoryGroup_
+  { cciId      = _categoryUid
+  , cciTitle   = H _categoryTitle
+  , cciCreated = H _categoryCreated
+  , cciGroup_  = H _categoryGroup_
   , cciStatus  = _categoryStatus
   }
 
 -- | A "light-weight" client type of 'Category', which gives all available
 -- information about a category
 data CCategoryFull = CCategoryFull
-  { ccfUid         :: Uid Category
+  { ccfId          :: Uid Category
   , ccfTitle       :: Text           ? "Category title"
   , ccfGroup       :: Text           ? "Category group ('grandcategory')"
   , ccfStatus      :: CategoryStatus
@@ -405,9 +405,9 @@ instance ToSchema CCategoryFull where
 -- | Factory to create a 'CCategoryFull' from a 'Category'
 toCCategoryFull :: Category -> CCategoryFull
 toCCategoryFull Category{..} = CCategoryFull
-  { ccfUid         = _categoryUid
-  , ccfTitle       = H $ _categoryTitle
-  , ccfGroup       = H $ _categoryGroup_
+  { ccfId          = _categoryUid
+  , ccfTitle       = H _categoryTitle
+  , ccfGroup       = H _categoryGroup_
   , ccfDescription = toCMarkdown _categoryNotes
   , ccfItems       = H $ fmap toCItemFull _categoryItems
   , ccfStatus      = _categoryStatus
@@ -439,7 +439,7 @@ instance ToSchema ItemSection where
 --
 -- When updating it, don't forget to update 'CItemInfoEdit' and 'setItemInfo'.
 data CItemInfo = CItemInfo
-  { ciiUid     :: Uid Item
+  { ciiId      :: Uid Item
   , ciiCreated :: UTCTime    ? "When the item was created"
   , ciiName    :: Text       ? "Item name"
   , ciiGroup   :: Maybe Text ? "Item group"
@@ -488,7 +488,7 @@ instance ToSchema CItemInfoEdit where
 
 -- | Client type of 'Item'
 data CItemFull = CItemFull
-  { cifUid         :: Uid Item
+  { cifId          :: Uid Item
   , cifName        :: Text                     ? "Item name"
   , cifCreated     :: UTCTime                  ? "When the item was created"
   , cifGroup       :: Maybe Text               ? "Item group"
@@ -511,28 +511,28 @@ instance ToSchema CItemFull where
 -- | Factory to create a 'CItemInfo' from an 'Item'
 toCItemInfo :: Item -> CItemInfo
 toCItemInfo Item{..} = CItemInfo
-  { ciiUid         = _itemUid
-  , ciiCreated     = H $ _itemCreated
-  , ciiName        = H $ _itemName
-  , ciiGroup       = H $ _itemGroup_
-  , ciiHackage     = H $ _itemHackage
-  , ciiLink        = H $ _itemLink
+  { ciiId          = _itemUid
+  , ciiCreated     = H _itemCreated
+  , ciiName        = H _itemName
+  , ciiGroup       = H _itemGroup_
+  , ciiHackage     = H _itemHackage
+  , ciiLink        = H _itemLink
   }
 
 -- | Factory to create a 'CItemFull' from an 'Item'
 toCItemFull :: Item -> CItemFull
 toCItemFull Item{..} = CItemFull
-  { cifUid         = _itemUid
-  , cifName        = H $ _itemName
-  , cifCreated     = H $ _itemCreated
-  , cifGroup       = H $ _itemGroup_
-  , cifHackage     = H $ _itemHackage
+  { cifId          = _itemUid
+  , cifName        = H _itemName
+  , cifCreated     = H _itemCreated
+  , cifGroup       = H _itemGroup_
+  , cifHackage     = H _itemHackage
   , cifSummary     = toCMarkdown _itemSummary
   , cifPros        = H $ fmap toCTrait _itemPros
   , cifCons        = H $ fmap toCTrait _itemCons
   , cifEcosystem   = toCMarkdown _itemEcosystem
   , cifNotes       = toCMarkdown _itemNotes
-  , cifLink        = H $ _itemLink
+  , cifLink        = H _itemLink
   , cifToc         = H $ map treeToCMD (markdownTreeMdTOC _itemNotes)
   }
   where
@@ -540,7 +540,7 @@ toCItemFull Item{..} = CItemFull
 
 -- | Client type of 'Trait'
 data CTrait = CTrait
-  { ctUid     :: Uid Trait
+  { ctId      :: Uid Trait
   , ctContent :: CMarkdown
   } deriving (Show, Generic)
 
@@ -553,7 +553,7 @@ instance ToSchema CTrait where
 -- | Factory to create a 'CTrait' from a 'Trait'
 toCTrait :: Trait -> CTrait
 toCTrait trait = CTrait
-  { ctUid     = trait ^. uid
+  { ctId     = trait ^. uid
   , ctContent = toCMarkdown $ trait ^. content
   }
 
diff --git a/front/client/components/Categories.vue b/front/client/components/Categories.vue
index c0cd10c..c1582f6 100644
--- a/front/client/components/Categories.vue
+++ b/front/client/components/Categories.vue
@@ -24,7 +24,7 @@
           <router-link
             class="category-title"
             v-for="category in groupCategories[CategoryStatus.finished]"
-            :key="category.uid"
+            :key="category.id"
             :to="`/haskell/${getCategoryUrl(category)}`"
           >
             <h6
@@ -43,7 +43,7 @@
           <router-link
             class="category-title ml-3"
             v-for="category in groupCategories[CategoryStatus.inProgress]"
-            :key="category.uid"
+            :key="category.id"
             :to="`/haskell/${getCategoryUrl(category)}`"
           >
             <h6
@@ -62,7 +62,7 @@
           <router-link
             class="category-title ml-3"
             v-for="category in groupCategories[CategoryStatus.toBeWritten]"
-            :key="category.uid"
+            :key="category.id"
             :to="`/haskell/${getCategoryUrl(category)}`"
           >
             <h6
@@ -135,7 +135,7 @@ export default class Categories extends Vue {
     this.isAddGroupDialogOpen = true
   }
   getCategoryUrl (category: ICategoryInfo): string {
-    return `${_toKebabCase(category.title)}-${category.uid}`
+    return `${_toKebabCase(category.title)}-${category.id}`
   }
 }
 </script>
diff --git a/front/client/components/Category.vue b/front/client/components/Category.vue
index 796ff99..9ff18ea 100644
--- a/front/client/components/Category.vue
+++ b/front/client/components/Category.vue
@@ -34,8 +34,8 @@
       <template v-if="category">
         <category-item
           v-for="value in category.items"
-          :key="value.uid"
-          :itemUid="value.uid"
+          :key="value.id"
+          :itemUid="value.id"
           :link="value.link"
           :name="value.name"
           :group="value.group"
@@ -101,7 +101,7 @@ export default class Category extends Vue {
   }
 
   get categoryUrl () {
-    return this.category && `${_toKebabCase(this.category.title)}-${this.category.uid}`
+    return this.category && `${_toKebabCase(this.category.title)}-${this.category.id}`
   }
 
   openAddItemDialog () {
diff --git a/front/client/components/CategoryItemTraits.vue b/front/client/components/CategoryItemTraits.vue
index cae313b..cbb6db9 100644
--- a/front/client/components/CategoryItemTraits.vue
+++ b/front/client/components/CategoryItemTraits.vue
@@ -135,7 +135,7 @@ export default class CategoryItemTraits extends Vue {
   async saveEdit (trait: any, modifiedText: string) {
     await this.$store.dispatch('categoryItem/updateItemTrait', {
       itemId: this.itemId,
-      traitId: trait.uid,
+      traitId: trait.id,
       original: trait.content.text,
       modified: modifiedText
     })
@@ -146,7 +146,7 @@ export default class CategoryItemTraits extends Vue {
   async moveTrait (trait: any, direction: string) {
     await this.$store.dispatch('categoryItem/moveItemTrait', {
       itemId: this.itemId,
-      traitId: trait.uid,
+      traitId: trait.id,
       direction
     })
     await this.$store.dispatch('category/reloadCategory')
@@ -170,7 +170,7 @@ export default class CategoryItemTraits extends Vue {
   async deleteTrait (trait: any) {
     await this.$store.dispatch('categoryItem/deleteItemTrait', {
       itemId: this.itemId,
-      traitId: trait.uid
+      traitId: trait.id
     })
     await this.$store.dispatch('category/reloadCategory')
   }
diff --git a/front/client/page/SearchResults.vue b/front/client/page/SearchResults.vue
index 42a2228..3bb59cb 100644
--- a/front/client/page/SearchResults.vue
+++ b/front/client/page/SearchResults.vue
@@ -17,7 +17,7 @@
             »
           <a-link
             openInNewTab
-            :url="`http://aelve.com:4801/haskell/${result.contents.info.uid}`"
+            :url="`http://aelve.com:4801/haskell/${result.contents.info.id}`"
           >
             {{ result.contents.info.title }}
           </a-link>
@@ -30,7 +30,7 @@
         <span class="search-result-title">
           <a-link
             openInNewTab
-            :url="`http://aelve.com:4801/haskell/${result.contents.category.uid}`"
+            :url="`http://aelve.com:4801/haskell/${result.contents.category.id}`"
           >
             {{ result.contents.category.title }}
           </a-link>
@@ -38,7 +38,7 @@
           <span>
             <a-link
               openInNewTab
-              :url="`http://aelve.com:4801/haskell/${result.contents.category.uid}#item-${result.contents.info.uid}`"
+              :url="`http://aelve.com:4801/haskell/${result.contents.category.id}#item-${result.contents.info.id}`"
             >
             <!-- Do not format next line to separate lines cause it adds extra space after </a-link>. -->
             {{ result.contents.info.name }}</a-link>'s ecosystem
diff --git a/front/client/service/Category.ts b/front/client/service/Category.ts
index 5953a34..dd72829 100644
--- a/front/client/service/Category.ts
+++ b/front/client/service/Category.ts
@@ -2,7 +2,7 @@ import axios from 'axios'
 import { ICategoryItem } from './CategoryItem'
 
 class CategoryService {
-  async getCategoryById (id: ICategoryInfo['uid']): Promise<ICategoryFull> {
+  async getCategoryById (id: ICategoryInfo['id']): Promise<ICategoryFull> {
     const { data } = await axios.get(`api/category/${id}`, {})
     return data
   }
@@ -14,7 +14,7 @@ class CategoryService {
 
   async createCategory (
     { title, group }: { title: ICategoryInfo['title'], group: ICategoryInfo['group'] }
-  ): Promise<ICategoryInfo['uid']> {
+  ): Promise<ICategoryInfo['id']> {
     const { data } = await axios.post('api/category', null, {
       params: {
         title,
@@ -32,7 +32,7 @@ export enum CategoryStatus {
 }
 
 export interface ICategoryInfo {
-  uid: string
+  id: string
   title: string
   created: string
   group: string
@@ -40,7 +40,7 @@ export interface ICategoryInfo {
 }
 
 export interface ICategoryFull {
-  uid: string
+  id: string
   title: string
   group: string
   status: CategoryStatus
diff --git a/front/client/service/CategoryItem.ts b/front/client/service/CategoryItem.ts
index 5871efa..3bf8782 100644
--- a/front/client/service/CategoryItem.ts
+++ b/front/client/service/CategoryItem.ts
@@ -11,19 +11,19 @@ class CategoryItemService {
     })
     return data
   }
-  async deleteItemById (id: ICategoryItem['uid']): Promise<void> {
+  async deleteItemById (id: ICategoryItem['id']): Promise<void> {
     await axios.delete(`api/item/${id}`)
   }
-  async  updateItemInfo (id: ICategoryItem['uid'], body: ICategoryItemInfo): Promise<void> {
+  async  updateItemInfo (id: ICategoryItem['id'], body: ICategoryItemInfo): Promise<void> {
     await axios.put(`api/item/${id}/info`, body)
   }
-  async moveItem (id: ICategoryItem['uid'], direction: string): Promise<void> {
+  async moveItem (id: ICategoryItem['id'], direction: string): Promise<void> {
     await axios.post(`api/item/${id}/move`, {
       direction
     })
   }
   async  updateItemSummary (
-    id: ICategoryItem['uid'],
+    id: ICategoryItem['id'],
     original: ICategoryItem['summary'],
     modified: ICategoryItem['summary']
   ): Promise<void> {
@@ -33,7 +33,7 @@ class CategoryItemService {
     })
   }
   async updateItemEcosystem (
-    id: ICategoryItem['uid'],
+    id: ICategoryItem['id'],
     original: ICategoryItem['ecosystem'],
     modified: ICategoryItem['ecosystem']
   ): Promise<void> {
@@ -43,7 +43,7 @@ class CategoryItemService {
     })
   }
   async updateItemNotes (
-    id: ICategoryItem['uid'],
+    id: ICategoryItem['id'],
     original: ICategoryItem['notes'],
     modified: ICategoryItem['notes']
   ): Promise<void> {
@@ -53,8 +53,8 @@ class CategoryItemService {
     })
   }
   async updateItemTrait (
-    itemId: ICategoryItem['uid'],
-    traitId: ITrait['uid'],
+    itemId: ICategoryItem['id'],
+    traitId: ITrait['id'],
     original: string,
     modified: string
   ): Promise<void> {
@@ -64,8 +64,8 @@ class CategoryItemService {
     })
   }
   async moveItemTrait (
-    itemId: ICategoryItem['uid'],
-    traitId: ITrait['uid'],
+    itemId: ICategoryItem['id'],
+    traitId: ITrait['id'],
     direction: string
   ): Promise<void> {
     await axios.post(`api/item/${itemId}/trait/${traitId}/move`, {
@@ -73,13 +73,13 @@ class CategoryItemService {
     })
   }
   async deleteItemTrait (
-    itemId: ICategoryItem['uid'],
-    traitId: ITrait['uid'],
+    itemId: ICategoryItem['id'],
+    traitId: ITrait['id'],
   ): Promise<void> {
     await axios.delete(`api/item/${itemId}/trait/${traitId}`)
   }
   async createItemTrait (
-    itemId: ICategoryItem['uid'],
+    itemId: ICategoryItem['id'],
     type: string,
     text: string,
   ): Promise<void> {
@@ -97,7 +97,7 @@ export interface ICreateCategoryItem {
 }
 
 export interface ICategoryItem {
-  uid: string
+  id: string
   name: string
   created: string
   group?: string
@@ -113,7 +113,7 @@ export interface ICategoryItem {
 }
 
 export interface ICategoryItemInfo {
-  uid?: string
+  id?: string
   name?: string
   created?: string
   link?: string
@@ -121,7 +121,7 @@ export interface ICategoryItemInfo {
 }
 
 export interface ITrait {
-  uid: string
+  id: string
   content: object
 }
 
diff --git a/front/client/store/modules/category.ts b/front/client/store/modules/category.ts
index 6d00ecf..f0dbc64 100644
--- a/front/client/store/modules/category.ts
+++ b/front/client/store/modules/category.ts
@@ -19,11 +19,11 @@ const actions: ActionTree<ICategoryState, any> = {
     if (!category) {
       return
     }
-    dispatch('loadCategory', category.uid)
+    dispatch('loadCategory', category.id)
   },
   async loadCategory (
     { commit }: ActionContext<ICategoryState, any>,
-    categoryId: ICategoryInfo['uid']
+    categoryId: ICategoryInfo['id']
   ): Promise<any> {
     const data: ICategoryFull = await CategoryService.getCategoryById(categoryId)
     // TODO create set function for all the store
@@ -36,7 +36,7 @@ const actions: ActionTree<ICategoryState, any> = {
   async createCategory (
     { dispatch }: ActionContext<ICategoryState, any>,
     { title, group }: { title: ICategoryInfo['title'], group: ICategoryInfo['group'] }
-  ): Promise<ICategoryInfo['uid']> {
+  ): Promise<ICategoryInfo['id']> {
     const createdId = await CategoryService.createCategory({
       title,
       group
diff --git a/front/client/store/modules/categoryItem.ts b/front/client/store/modules/categoryItem.ts
index d4cb676..f5f1902 100644
--- a/front/client/store/modules/categoryItem.ts
+++ b/front/client/store/modules/categoryItem.ts
@@ -21,7 +21,7 @@ const actions: ActionTree<ICategoryItemState, any> = {
   async createItem (
     { dispatch }: ActionContext<ICategoryItemState, any>,
     { category, name }: ICreateCategoryItem
-  ): Promise<ICategoryItem['uid']> {
+  ): Promise<ICategoryItem['id']> {
     const createdId = await CategoryItemService.createItem({
       category,
       name
@@ -29,36 +29,36 @@ const actions: ActionTree<ICategoryItemState, any> = {
     dispatch('category/reloadCategory', null, { root: true })
     return createdId
   },
-  async deleteItemById (context, id: ICategoryItem['uid']) {
+  async deleteItemById (context, id: ICategoryItem['id']) {
     await CategoryItemService.deleteItemById(id)
   },
   async updateItemInfo (
     context: ActionContext<ICategoryItemState, any>,
-    { id, body }: { id: ICategoryItem['uid'], body: ICategoryItemInfo }
+    { id, body }: { id: ICategoryItem['id'], body: ICategoryItemInfo }
   ): Promise<void> {
     await CategoryItemService.updateItemInfo(id, body)
   },
   async moveItem (
     context: ActionContext<ICategoryItemState, any>,
-    { id, direction }: { id: ICategoryItem['uid'], direction: string }
+    { id, direction }: { id: ICategoryItem['id'], direction: string }
   ): Promise<void> {
     await CategoryItemService.moveItem(id, direction)
   },
   async updateItemSummary (
     context: ActionContext<ICategoryItemState, any>,
-    { id, original, modified }: { id: ICategoryItem['uid'], original: ICategoryItem['summary'], modified: ICategoryItem['summary'] }
+    { id, original, modified }: { id: ICategoryItem['id'], original: ICategoryItem['summary'], modified: ICategoryItem['summary'] }
   ): Promise<void> {
     await CategoryItemService.updateItemSummary(id, original, modified)
   },
   async updateItemEcosystem (
     context: ActionContext<ICategoryItemState, any>,
-    { id, original, modified }: { id: ICategoryItem['uid'], original: ICategoryItem['ecosystem'], modified: ICategoryItem['ecosystem'] }
+    { id, original, modified }: { id: ICategoryItem['id'], original: ICategoryItem['ecosystem'], modified: ICategoryItem['ecosystem'] }
   ): Promise<void> {
     await CategoryItemService.updateItemEcosystem(id, original, modified)
   },
   async updateItemNotes (
     context: ActionContext<ICategoryItemState, any>,
-    { id, original, modified }: { id: ICategoryItem['uid'], original: ICategoryItem['notes'], modified: ICategoryItem['notes'] }
+    { id, original, modified }: { id: ICategoryItem['id'], original: ICategoryItem['notes'], modified: ICategoryItem['notes'] }
   ): Promise<void> {
     await CategoryItemService.updateItemNotes(id, original, modified)
   },
@@ -70,8 +70,8 @@ const actions: ActionTree<ICategoryItemState, any> = {
       original,
       modified
     }: {
-      itemId: ICategoryItem['uid'],
-      traitId: ITrait['uid'],
+      itemId: ICategoryItem['id'],
+      traitId: ITrait['id'],
       original: string,
       modified: string
     }
@@ -85,8 +85,8 @@ const actions: ActionTree<ICategoryItemState, any> = {
       traitId,
       direction
     }: {
-      itemId: ICategoryItem['uid'],
-      traitId: ITrait['uid'],
+      itemId: ICategoryItem['id'],
+      traitId: ITrait['id'],
       direction: string
     }
   ): Promise<void> {
@@ -98,8 +98,8 @@ const actions: ActionTree<ICategoryItemState, any> = {
       itemId,
       traitId,
     }: {
-      itemId: ICategoryItem['uid'],
-      traitId: ITrait['uid']
+      itemId: ICategoryItem['id'],
+      traitId: ITrait['id']
     }
   ): Promise<void> {
     await CategoryItemService.deleteItemTrait(itemId, traitId)
@@ -110,7 +110,7 @@ const actions: ActionTree<ICategoryItemState, any> = {
       type,
       text
     }: {
-      itemId: ICategoryItem['uid'],
+      itemId: ICategoryItem['id'],
       type: string,
       text: string,
     }