diff --git a/api/Diagram 2023-01-24 09-53-59.uxf b/api/Diagram 2023-01-24 09-53-59.uxf
index f49c4be..927ec1a 100644
--- a/api/Diagram 2023-01-24 09-53-59.uxf	
+++ b/api/Diagram 2023-01-24 09-53-59.uxf	
@@ -1,4 +1,4 @@
-<diagram program="umletino" version="15.0.0"><zoom_level>10</zoom_level><element><id>UMLClass</id><coordinates><x>279</x><y>60</y><w>210</w><h>140</h></coordinates><panel_attributes>USER
+<diagram program="umletino" version="15.0.0"><zoom_level>10</zoom_level><element><id>UMLClass</id><coordinates><x>200</x><y>40</y><w>210</w><h>140</h></coordinates><panel_attributes>USER
 --
 _id: INT_
 email: VARCHAR
@@ -6,8 +6,8 @@ password: VARCHAR
 name: VARCHAR
 picture_path: VARCHAR
 created_at: DATE
-updated_at: DATE</panel_attributes><additional_attributes></additional_attributes></element><element><id>Relation</id><coordinates><x>369</x><y>190</y><w>50</w><h>140</h></coordinates><panel_attributes>m1=1
-m2=0..*</panel_attributes><additional_attributes>10;10;10;120</additional_attributes></element><element><id>UMLClass</id><coordinates><x>279</x><y>310</y><w>210</w><h>170</h></coordinates><panel_attributes>SNIPPET
+updated_at: DATE</panel_attributes><additional_attributes></additional_attributes></element><element><id>Relation</id><coordinates><x>290</x><y>170</y><w>50</w><h>140</h></coordinates><panel_attributes>m1=1
+m2=0..*</panel_attributes><additional_attributes>10;10;10;120</additional_attributes></element><element><id>UMLClass</id><coordinates><x>200</x><y>290</y><w>210</w><h>160</h></coordinates><panel_attributes>SNIPPET
 --
 _id: INT_
 title: VARCHAR
@@ -15,24 +15,25 @@ code: LONGTEXT
 created_at: DATE
 updated_at: DATE
 _user_id: INT_
-_tag_id: INT_
 _category_id: INT_
-_language_id: INT_</panel_attributes><additional_attributes></additional_attributes></element><element><id>UMLClass</id><coordinates><x>619</x><y>520</y><w>100</w><h>60</h></coordinates><panel_attributes>TAG
---
-_id: INT_
-name: VARCHAR</panel_attributes><additional_attributes></additional_attributes></element><element><id>UMLClass</id><coordinates><x>79</x><y>330</y><w>110</w><h>80</h></coordinates><panel_attributes>CATEGORY
+_language_id: INT_</panel_attributes><additional_attributes></additional_attributes></element><element><id>UMLClass</id><coordinates><x>500</x><y>70</y><w>100</w><h>80</h></coordinates><panel_attributes>TAG
 --
 _id: INT_
 name: VARCHAR
-_user_id: INT_</panel_attributes><additional_attributes></additional_attributes></element><element><id>Relation</id><coordinates><x>179</x><y>350</y><w>120</w><h>40</h></coordinates><panel_attributes>m1=1
-m2=0..*</panel_attributes><additional_attributes>10;10;100;10</additional_attributes></element><element><id>UMLClass</id><coordinates><x>619</x><y>350</y><w>100</w><h>60</h></coordinates><panel_attributes>SNIPPET_TAG
---
-_snippet_id: INT_
-_tag_id: INT_</panel_attributes><additional_attributes></additional_attributes></element><element><id>Relation</id><coordinates><x>479</x><y>370</y><w>160</w><h>40</h></coordinates><panel_attributes>m1=1
-m2=0..*</panel_attributes><additional_attributes>10;10;140;10</additional_attributes></element><element><id>Relation</id><coordinates><x>659</x><y>400</y><w>50</w><h>140</h></coordinates><panel_attributes>m1=1
-m2=0..*</panel_attributes><additional_attributes>10;120;10;10</additional_attributes></element><element><id>UMLClass</id><coordinates><x>339</x><y>580</y><w>100</w><h>60</h></coordinates><panel_attributes>LANGUAGE
+_user_id: INT_</panel_attributes><additional_attributes></additional_attributes></element><element><id>UMLClass</id><coordinates><x>0</x><y>340</y><w>110</w><h>80</h></coordinates><panel_attributes>CATEGORY
 --
 _id: INT_
-name: VARCHAR</panel_attributes><additional_attributes></additional_attributes></element><element><id>Relation</id><coordinates><x>379</x><y>470</y><w>50</w><h>130</h></coordinates><panel_attributes>m1=0..*
-m2=1</panel_attributes><additional_attributes>10;10;10;110</additional_attributes></element><element><id>Relation</id><coordinates><x>119</x><y>120</y><w>180</w><h>230</h></coordinates><panel_attributes>m1=1
-m2=0..*</panel_attributes><additional_attributes>160;10;10;10;10;210</additional_attributes></element></diagram>
\ No newline at end of file
+name: VARCHAR
+_user_id: INT_</panel_attributes><additional_attributes></additional_attributes></element><element><id>Relation</id><coordinates><x>100</x><y>360</y><w>120</w><h>40</h></coordinates><panel_attributes>m1=1
+m2=0..*</panel_attributes><additional_attributes>10;10;100;10</additional_attributes></element><element><id>UMLClass</id><coordinates><x>500</x><y>340</y><w>100</w><h>60</h></coordinates><panel_attributes>SNIPPET_TAG
+--
+_snippet_id: INT_
+_tag_id: INT_</panel_attributes><additional_attributes></additional_attributes></element><element><id>Relation</id><coordinates><x>400</x><y>360</y><w>120</w><h>40</h></coordinates><panel_attributes>m1=1
+m2=0..*</panel_attributes><additional_attributes>10;10;100;10</additional_attributes></element><element><id>Relation</id><coordinates><x>540</x><y>140</y><w>50</w><h>220</h></coordinates><panel_attributes>m1=1
+m2=0..*</panel_attributes><additional_attributes>10;10;10;200</additional_attributes></element><element><id>UMLClass</id><coordinates><x>250</x><y>530</y><w>100</w><h>60</h></coordinates><panel_attributes>LANGUAGE
+--
+_id: INT_
+name: VARCHAR</panel_attributes><additional_attributes></additional_attributes></element><element><id>Relation</id><coordinates><x>290</x><y>440</y><w>50</w><h>110</h></coordinates><panel_attributes>m1=0..*
+m2=1</panel_attributes><additional_attributes>10;10;10;90</additional_attributes></element><element><id>Relation</id><coordinates><x>40</x><y>100</y><w>180</w><h>260</h></coordinates><panel_attributes>m1=1
+m2=0..*</panel_attributes><additional_attributes>160;10;10;10;10;240</additional_attributes></element><element><id>Relation</id><coordinates><x>400</x><y>100</y><w>120</w><h>40</h></coordinates><panel_attributes>m1=1
+m2=0..*</panel_attributes><additional_attributes>10;10;100;10</additional_attributes></element></diagram>
\ No newline at end of file
diff --git a/api/Diagramme relation entité.png b/api/Diagramme relation entité.png
index 47634c8..dac2035 100644
Binary files a/api/Diagramme relation entité.png and b/api/Diagramme relation entité.png differ
diff --git a/prisma/migrations/20230130094648_user_id_on_tags/migration.sql b/prisma/migrations/20230130094648_user_id_on_tags/migration.sql
new file mode 100644
index 0000000..cf7929a
--- /dev/null
+++ b/prisma/migrations/20230130094648_user_id_on_tags/migration.sql
@@ -0,0 +1,11 @@
+/*
+  Warnings:
+
+  - Added the required column `user_id` to the `Tag` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- AlterTable
+ALTER TABLE `Tag` ADD COLUMN `user_id` INTEGER NOT NULL;
+
+-- AddForeignKey
+ALTER TABLE `Tag` ADD CONSTRAINT `Tag_user_id_fkey` FOREIGN KEY (`user_id`) REFERENCES `User`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 1356a86..04ea00f 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -17,6 +17,7 @@ model User {
   updated_at   DateTime   @updatedAt
   Snippet      Snippet[]
   Category     Category[]
+  Tag          Tag[]
 }
 
 model Snippet {
@@ -61,5 +62,7 @@ model Snippet_tag {
 model Tag {
   id          Int           @id @default(autoincrement())
   name        String
+  user_id     Int
+  user        User          @relation(fields: [user_id], references: [id])
   Snippet_tag Snippet_tag[]
 }