diff --git a/exam/api/Users/Users.php b/exam/api/Users/Users.php
index 1bf0512..de61baa 100644
--- a/exam/api/Users/Users.php
+++ b/exam/api/Users/Users.php
@@ -42,12 +42,12 @@ class Users extends Api
     // Fetch all inputs.
     $username = Input::patch("username");
     $password = Input::patch("password");
-    $image = Input::file("image");
+    $email = Input::patch("email");
 
     // Try and update user.
     // Throw errors according to situation.
     try {
-      Response::json(User::getByID($id)->update($username, $password, $image));
+      Response::json(User::getByID($id)->update($username, $password, $email));
     } catch (Exception $err) {
       switch ($err->getMessage()) {
         case "NotFound":
@@ -65,12 +65,12 @@ class Users extends Api
     $token = Request::token();
     $username = Input::patch("username");
     $password = Input::patch("password");
-    $image = Input::file("image");
+    $email = Input::patch("email");
 
     // Try and update user.
     // Throw errors according to situation.
     try {
-      Response::json(User::getByToken($token)->update($username, $password, $image));
+      Response::json(User::getByToken($token)->update($username, $password, $email));
     } catch (Exception $err) {
       switch ($err->getMessage()) {
         case "NotFound":
diff --git a/exam/api/docs/api.yaml b/exam/api/docs/api.yaml
index ddde78e..52f0dd6 100644
--- a/exam/api/docs/api.yaml
+++ b/exam/api/docs/api.yaml
@@ -254,7 +254,12 @@ paths:
                 $ref: "#/components/schemas/FailedUpdateResponse"
               examples:
                 Failed:
-                  value: { "code": "FailedUpdate", "fields": ["content"] }
+                  value:
+                    {
+                      "code": "FailedUpdate",
+                      "fields": ["content"],
+                      "reasons": ["string"],
+                    }
       tags:
         - Post
     delete:
@@ -481,7 +486,8 @@ paths:
                   value:
                     {
                       "code": "FailedUpdate",
-                      "fields": ["username", "password", "image"],
+                      "fields": ["username", "password", "email"],
+                      "reasons": ["string", "string", "string"],
                     }
       tags:
         - User
@@ -572,6 +578,10 @@ components:
           type: array
           items:
             type: string
+        reasons:
+          type: array
+          items:
+            type: string
     ErrorResponse:
       type: object
       properties:
@@ -629,9 +639,8 @@ components:
           type: string
         password:
           type: string
-        image:
+        email:
           type: string
-          format: binary
     RegisterRequest:
       type: object
       required:
diff --git a/exam/api/docs/index.html b/exam/api/docs/index.html
index fa46510..c6b185c 100644
--- a/exam/api/docs/index.html
+++ b/exam/api/docs/index.html
@@ -490,13 +490,13 @@ data-styled.g137[id="sc-kvXgyf"]{content:"fBvPoH,"}/*!sc*/
 " class="sc-euGpHm sc-exayXG fwfkcU kqJXdD"><p>Update user with ID. <br> Use special ID <code>self</code> to update logged in user. <br> Requires logged in user to have admin permissions for any ID other than <code>self</code>.</p>
 </div></div><div class="sc-hWiVxH cCfxdS"><div class="sc-jHofgq febKCY"><h5 class="sc-dkjaqt sc-jRHPII gwrByh eGMvsx">Authorizations:</h5><svg class="sc-cBYhjr dJanPw" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></div><div class="sc-iRFtIJ juVMxG"><span class="sc-iHlJgr lkBZak"><span class="sc-blcnQh fyveIh"><i>BasicAuth</i></span></span><span class="sc-iHlJgr lkBZak"><span class="sc-blcnQh fyveIh"><i>BasicAuth</i></span></span></div></div><div><h5 class="sc-dkjaqt gwrByh">path<!-- --> Parameters</h5><table class="sc-dENhDJ ceVHDP"><tbody><tr class="last "><td kind="field" title="id" class="sc-tOkKi sc-epPVmt gbdrVc bUksBx"><span class="sc-hfvVTD hTjFRU"></span><span class="property-name">id</span><div class="sc-xuUkR sc-hrDJJk bJcEcT gLEAmN">required</div></td><td class="sc-fpSrms exGrJC"><div><div><span class="sc-xuUkR sc-cvzDha bJcEcT kDPMlG"></span><span class="sc-xuUkR sc-gKROGD bJcEcT etUsjc">integer</span><span class="sc-xuUkR sc-gKROGD bJcEcT etUsjc"> <!-- -->&lt;<!-- -->int14<!-- -->&gt;<!-- --> </span></div> <div><div html="&lt;p&gt;User ID&lt;/p&gt;
 " class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"><p>User ID</p>
-</div></div></div></td></tr></tbody></table></div><h5 class="sc-dkjaqt gwrByh">Request Body schema: <span class="sc-dwYcXH fafqZb">application/json</span></h5><div html="" class="sc-euGpHm sc-exayXG fwfkcU kqJXdD"></div><table class="sc-dENhDJ ceVHDP"><tbody><tr class=""><td kind="field" title="username" class="sc-tOkKi sc-epPVmt gbdrVc bUksBx"><span class="sc-hfvVTD hTjFRU"></span><span class="property-name">username</span></td><td class="sc-fpSrms exGrJC"><div><div><span class="sc-xuUkR sc-cvzDha bJcEcT kDPMlG"></span><span class="sc-xuUkR sc-gKROGD bJcEcT etUsjc">string</span></div> <div><div html="" class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"></div></div></div></td></tr><tr class=""><td kind="field" title="password" class="sc-tOkKi sc-epPVmt gbdrVc bUksBx"><span class="sc-hfvVTD hTjFRU"></span><span class="property-name">password</span></td><td class="sc-fpSrms exGrJC"><div><div><span class="sc-xuUkR sc-cvzDha bJcEcT kDPMlG"></span><span class="sc-xuUkR sc-gKROGD bJcEcT etUsjc">string</span></div> <div><div html="" class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"></div></div></div></td></tr><tr class="last "><td kind="field" title="image" class="sc-tOkKi sc-epPVmt gbdrVc bUksBx"><span class="sc-hfvVTD hTjFRU"></span><span class="property-name">image</span></td><td class="sc-fpSrms exGrJC"><div><div><span class="sc-xuUkR sc-cvzDha bJcEcT kDPMlG"></span><span class="sc-xuUkR sc-gKROGD bJcEcT etUsjc">string</span><span class="sc-xuUkR sc-gKROGD bJcEcT etUsjc"> <!-- -->&lt;<!-- -->binary<!-- -->&gt;<!-- --> </span></div> <div><div html="" class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"></div></div></div></td></tr></tbody></table><div><h3 class="sc-eiLgtK dbBFCU">Responses</h3><div><button class="sc-giOWAb gcYfHW"><svg class="sc-cBYhjr fqtTpb" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg><strong class="sc-catHVh gXPvFO">200<!-- --> </strong><div html="&lt;p&gt;Success.&lt;/p&gt;
+</div></div></div></td></tr></tbody></table></div><h5 class="sc-dkjaqt gwrByh">Request Body schema: <span class="sc-dwYcXH fafqZb">application/json</span></h5><div html="" class="sc-euGpHm sc-exayXG fwfkcU kqJXdD"></div><table class="sc-dENhDJ ceVHDP"><tbody><tr class=""><td kind="field" title="username" class="sc-tOkKi sc-epPVmt gbdrVc bUksBx"><span class="sc-hfvVTD hTjFRU"></span><span class="property-name">username</span></td><td class="sc-fpSrms exGrJC"><div><div><span class="sc-xuUkR sc-cvzDha bJcEcT kDPMlG"></span><span class="sc-xuUkR sc-gKROGD bJcEcT etUsjc">string</span></div> <div><div html="" class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"></div></div></div></td></tr><tr class=""><td kind="field" title="password" class="sc-tOkKi sc-epPVmt gbdrVc bUksBx"><span class="sc-hfvVTD hTjFRU"></span><span class="property-name">password</span></td><td class="sc-fpSrms exGrJC"><div><div><span class="sc-xuUkR sc-cvzDha bJcEcT kDPMlG"></span><span class="sc-xuUkR sc-gKROGD bJcEcT etUsjc">string</span></div> <div><div html="" class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"></div></div></div></td></tr><tr class="last "><td kind="field" title="email" class="sc-tOkKi sc-epPVmt gbdrVc bUksBx"><span class="sc-hfvVTD hTjFRU"></span><span class="property-name">email</span></td><td class="sc-fpSrms exGrJC"><div><div><span class="sc-xuUkR sc-cvzDha bJcEcT kDPMlG"></span><span class="sc-xuUkR sc-gKROGD bJcEcT etUsjc">string</span></div> <div><div html="" class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"></div></div></div></td></tr></tbody></table><div><h3 class="sc-eiLgtK dbBFCU">Responses</h3><div><button class="sc-giOWAb gcYfHW"><svg class="sc-cBYhjr fqtTpb" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg><strong class="sc-catHVh gXPvFO">200<!-- --> </strong><div html="&lt;p&gt;Success.&lt;/p&gt;
 " class="sc-euGpHm sc-exayXG fwfkcU kqJXdD sc-dHrNzZ dRdjww"><p>Success.</p>
 </div></button></div><div><button class="sc-giOWAb gbPhWg"><svg class="sc-cBYhjr ezFOZv" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg><strong class="sc-catHVh gXPvFO">404<!-- --> </strong><div html="&lt;p&gt;User not found.&lt;/p&gt;
 " class="sc-euGpHm sc-exayXG fwfkcU kqJXdD sc-dHrNzZ dRdjww"><p>User not found.</p>
 </div></button></div><div><button class="sc-giOWAb gbPhWg"><svg class="sc-cBYhjr ezFOZv" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg><strong class="sc-catHVh gXPvFO">500<!-- --> </strong><div html="&lt;p&gt;Update failed.&lt;/p&gt;
 " class="sc-euGpHm sc-exayXG fwfkcU kqJXdD sc-dHrNzZ dRdjww"><p>Update failed.</p>
-</div></button></div></div></div><div class="sc-iKTcqh sc-gnpbhQ fTxZsC drGLlX"><div class="sc-dKsqdn dCbPd"><button class="sc-iAlELC gsBSOU"><span type="patch" class="sc-oeqTF eUIOSr http-verb patch">patch</span><span class="sc-eowDPD jcAXWA">/users/{id}</span><svg class="sc-cBYhjr iMxoRf" style="margin-right:-25px" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button><div aria-hidden="true" class="sc-ezTrPE bFiOkX"><div class="sc-drnuxz hdRKqQ"><div html="" class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"></div><div tabindex="0" role="button"><div class="sc-hDcvty jpmGrk"><span>https://khofmann.userpage.fu-berlin.de/phpCourse/exam/api</span>/users/{id}</div></div></div></div></div><div><h3 class="sc-kkmypM jKNCPF"> <!-- -->Request samples<!-- --> </h3><div class="sc-bSlUec jxQggo" data-rttabs="true"><ul class="react-tabs__tab-list" role="tablist"><li class="react-tabs__tab react-tabs__tab--selected" role="tab" id="tab:R155qa:0" aria-selected="true" aria-disabled="false" aria-controls="panel:R155qa:0" tabindex="0" data-rttab="true">Payload</li></ul><div class="react-tabs__tab-panel react-tabs__tab-panel--selected" role="tabpanel" id="panel:R155qa:0" aria-labelledby="tab:R155qa:0"><div><div class="sc-WChnI iLXIA-d"><span class="sc-foMnoT dmNpjh">Content type</span><div class="sc-ZubPq KmnOC">application/json</div></div><div class="sc-AmOMz gDrQpr"><div class="sc-eTdEpr dgzSkD"><div class="sc-pFPEP bMXXJy"><button><div class="sc-eHujzY ecCAmX">Copy</div></button></div><div class="sc-euGpHm fwfkcU sc-fTgapq bDqsIm"><div class="redoc-json"><code><button class="collapser" aria-label="collapse"></button><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable "><span class="property token string">"username"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"password"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"image"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></code></div></div></div></div></div></div></div></div><div><h3 class="sc-kkmypM jKNCPF"> <!-- -->Response samples<!-- --> </h3><div class="sc-bSlUec jxQggo" data-rttabs="true"><ul class="react-tabs__tab-list" role="tablist"><li class="tab-success react-tabs__tab--selected" role="tab" id="tab:R175qa:0" aria-selected="true" aria-disabled="false" aria-controls="panel:R175qa:0" tabindex="0" data-rttab="true">200</li><li class="tab-error" role="tab" id="tab:R175qa:1" aria-selected="false" aria-disabled="false" aria-controls="panel:R175qa:1" data-rttab="true">404</li><li class="tab-error" role="tab" id="tab:R175qa:2" aria-selected="false" aria-disabled="false" aria-controls="panel:R175qa:2" data-rttab="true">500</li></ul><div class="react-tabs__tab-panel react-tabs__tab-panel--selected" role="tabpanel" id="panel:R175qa:0" aria-labelledby="tab:R175qa:0"><div><div class="sc-WChnI iLXIA-d"><span class="sc-foMnoT dmNpjh">Content type</span><div class="sc-ZubPq KmnOC">application/json</div></div><div class="sc-AmOMz gDrQpr"><div class="sc-eTdEpr dgzSkD"><div class="sc-pFPEP bMXXJy"><button><div class="sc-eHujzY ecCAmX">Copy</div></button><button> Expand all </button><button> Collapse all </button></div><div class="sc-euGpHm fwfkcU sc-fTgapq bDqsIm"><div class="redoc-json"><code><button class="collapser" aria-label="collapse"></button><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable "><span class="property token string">"id"</span>: <span class="token number">0</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"username"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"status"</span>: <span class="token number">0</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"email"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"image"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"isAdmin"</span>: <span class="token boolean">true</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"memberSince"</span>: <button class="collapser" aria-label="collapse"></button><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"date"</span>: <span class="token string">&quot;2019-08-24T14:15:22Z&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"timezone_type"</span>: <span class="token number">0</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"timezone"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"postCount"</span>: <span class="token number">0</span></div></li></ul><span class="token punctuation">}</span></code></div></div></div></div></div></div><div class="react-tabs__tab-panel" role="tabpanel" id="panel:R175qa:1" aria-labelledby="tab:R175qa:1"></div><div class="react-tabs__tab-panel" role="tabpanel" id="panel:R175qa:2" aria-labelledby="tab:R175qa:2"></div></div></div></div></div></div><div id="tag/User/paths/~1users~1{id}/delete" data-section-id="tag/User/paths/~1users~1{id}/delete" class="sc-dsLQwm kcRA-dj"><div class="sc-la-DxNn dSIRVR"><div class="sc-fQpRED htdgPt"><h2 class="sc-knesRu cbpGTP"><a class="sc-jCbFiK hSvuOo" href="#tag/User/paths/~1users~1{id}/delete" aria-label="tag/User/paths/~1users~1{id}/delete"></a>Delete user<!-- --> </h2><div class="sc-fpJhiv cQxXyG"><div html="&lt;p&gt;Delete user with ID.&lt;/p&gt;
+</div></button></div></div></div><div class="sc-iKTcqh sc-gnpbhQ fTxZsC drGLlX"><div class="sc-dKsqdn dCbPd"><button class="sc-iAlELC gsBSOU"><span type="patch" class="sc-oeqTF eUIOSr http-verb patch">patch</span><span class="sc-eowDPD jcAXWA">/users/{id}</span><svg class="sc-cBYhjr iMxoRf" style="margin-right:-25px" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button><div aria-hidden="true" class="sc-ezTrPE bFiOkX"><div class="sc-drnuxz hdRKqQ"><div html="" class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"></div><div tabindex="0" role="button"><div class="sc-hDcvty jpmGrk"><span>https://khofmann.userpage.fu-berlin.de/phpCourse/exam/api</span>/users/{id}</div></div></div></div></div><div><h3 class="sc-kkmypM jKNCPF"> <!-- -->Request samples<!-- --> </h3><div class="sc-bSlUec jxQggo" data-rttabs="true"><ul class="react-tabs__tab-list" role="tablist"><li class="react-tabs__tab react-tabs__tab--selected" role="tab" id="tab:R155qa:0" aria-selected="true" aria-disabled="false" aria-controls="panel:R155qa:0" tabindex="0" data-rttab="true">Payload</li></ul><div class="react-tabs__tab-panel react-tabs__tab-panel--selected" role="tabpanel" id="panel:R155qa:0" aria-labelledby="tab:R155qa:0"><div><div class="sc-WChnI iLXIA-d"><span class="sc-foMnoT dmNpjh">Content type</span><div class="sc-ZubPq KmnOC">application/json</div></div><div class="sc-AmOMz gDrQpr"><div class="sc-eTdEpr dgzSkD"><div class="sc-pFPEP bMXXJy"><button><div class="sc-eHujzY ecCAmX">Copy</div></button></div><div class="sc-euGpHm fwfkcU sc-fTgapq bDqsIm"><div class="redoc-json"><code><button class="collapser" aria-label="collapse"></button><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable "><span class="property token string">"username"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"password"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"email"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span></code></div></div></div></div></div></div></div></div><div><h3 class="sc-kkmypM jKNCPF"> <!-- -->Response samples<!-- --> </h3><div class="sc-bSlUec jxQggo" data-rttabs="true"><ul class="react-tabs__tab-list" role="tablist"><li class="tab-success react-tabs__tab--selected" role="tab" id="tab:R175qa:0" aria-selected="true" aria-disabled="false" aria-controls="panel:R175qa:0" tabindex="0" data-rttab="true">200</li><li class="tab-error" role="tab" id="tab:R175qa:1" aria-selected="false" aria-disabled="false" aria-controls="panel:R175qa:1" data-rttab="true">404</li><li class="tab-error" role="tab" id="tab:R175qa:2" aria-selected="false" aria-disabled="false" aria-controls="panel:R175qa:2" data-rttab="true">500</li></ul><div class="react-tabs__tab-panel react-tabs__tab-panel--selected" role="tabpanel" id="panel:R175qa:0" aria-labelledby="tab:R175qa:0"><div><div class="sc-WChnI iLXIA-d"><span class="sc-foMnoT dmNpjh">Content type</span><div class="sc-ZubPq KmnOC">application/json</div></div><div class="sc-AmOMz gDrQpr"><div class="sc-eTdEpr dgzSkD"><div class="sc-pFPEP bMXXJy"><button><div class="sc-eHujzY ecCAmX">Copy</div></button><button> Expand all </button><button> Collapse all </button></div><div class="sc-euGpHm fwfkcU sc-fTgapq bDqsIm"><div class="redoc-json"><code><button class="collapser" aria-label="collapse"></button><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable "><span class="property token string">"id"</span>: <span class="token number">0</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"username"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"status"</span>: <span class="token number">0</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"email"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"image"</span>: <span class="token string">&quot;string&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"isAdmin"</span>: <span class="token boolean">true</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"memberSince"</span>: <button class="collapser" aria-label="collapse"></button><span class="token punctuation">{</span><span class="ellipsis"></span><ul class="obj collapsible"><li><div class="hoverable collapsed"><span class="property token string">"date"</span>: <span class="token string">&quot;2019-08-24T14:15:22Z&quot;</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"timezone_type"</span>: <span class="token number">0</span><span class="token punctuation">,</span></div></li><li><div class="hoverable collapsed"><span class="property token string">"timezone"</span>: <span class="token string">&quot;string&quot;</span></div></li></ul><span class="token punctuation">}</span><span class="token punctuation">,</span></div></li><li><div class="hoverable "><span class="property token string">"postCount"</span>: <span class="token number">0</span></div></li></ul><span class="token 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 " class="sc-euGpHm sc-exayXG fwfkcU kqJXdD"><p>Delete user with ID.</p>
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 " class="sc-euGpHm sc-exayXG fwfkcU jYGAQp"><p>User ID</p>
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
       var container = document.getElementById('redoc');
       Redoc.hydrate(__redoc_state, container);
diff --git a/exam/classes/ApiError/ApiError.php b/exam/classes/ApiError/ApiError.php
index 56d6176..410679f 100644
--- a/exam/classes/ApiError/ApiError.php
+++ b/exam/classes/ApiError/ApiError.php
@@ -51,11 +51,12 @@ class ApiError extends Exception
     ]), 500);
   }
 
-  public static function failedUpdate(array $fields)
+  public static function failedUpdate(array $fields, array $reasons)
   {
     return new ApiError(json_encode([
       "code" => "FailedUpdate",
       "fields" => $fields,
+      "reasons" => $reasons,
     ]), 500);
   }
 }
diff --git a/exam/classes/Models/Post/Post.php b/exam/classes/Models/Post/Post.php
index 01ea468..f44a196 100644
--- a/exam/classes/Models/Post/Post.php
+++ b/exam/classes/Models/Post/Post.php
@@ -118,6 +118,10 @@ class Post implements JsonSerializable
   {
     $db = Database::getInstance();
 
+    $db->beginTransaction();
+
+    $failed = [];
+    $reason = [];
     if (!empty($content)) {
       $content = substr(trim($content), 0, 250);
 
@@ -125,11 +129,25 @@ class Post implements JsonSerializable
       $stmt->bindValue(":CON", nl2br(htmlspecialchars($content)));
       $stmt->bindValue(":ID", $this->id);
       try {
-        if (!$stmt->execute()) throw ApiError::failedUpdate(["content"]);
+        if (!$stmt->execute()) {
+          $failed = ["content"];
+          $reason = ["generic"];
+        }
       } catch (Exception $e) {
-        throw ApiError::failedUpdate(["content"]);
+        $failed = ["content"];
+        if ($e->getCode() === "23000") {
+          $pdoErr = $stmt->errorInfo()[1];
+          $reason = ["SQL: $pdoErr"];
+        } else $reason = ["{$e->getCode()}"];
       }
     }
+    if ($failed !== null) {
+      $db->rollBack();
+
+      throw ApiError::failedUpdate($failed, $reason);
+    }
+
+    $db->commit();
 
     return Post::getByID($this->id);
   }
diff --git a/exam/classes/Models/User/User.php b/exam/classes/Models/User/User.php
index 18a9406..5193cfb 100644
--- a/exam/classes/Models/User/User.php
+++ b/exam/classes/Models/User/User.php
@@ -270,19 +270,30 @@ class User implements JsonSerializable
     return $stmt->execute();
   }
 
-  public function update(?string $username, ?string $password, $image = null): User
+  public function update(?string $username, ?string $password, ?string $email): User
   {
     $db = Database::getInstance();
 
+    $db->beginTransaction();
+
     $failed = [];
+    $reasons = [];
     if (!empty($username)) {
       $stmt = $db->prepare("UPDATE egb_benutzer SET benutzer = :USR WHERE id = :ID");
       $stmt->bindValue(":USR", htmlspecialchars($username));
       $stmt->bindValue(":ID", $this->id);
       try {
-        if (!$stmt->execute()) array_push($failed, "username");
+        if (!$stmt->execute()) {
+          array_push($failed, "username");
+          array_push($reasons, "generic");
+        }
       } catch (Exception $e) {
         array_push($failed, "username");
+        if ($e->getCode() === "23000") {
+          $pdoErr = $stmt->errorInfo()[1];
+          if ($pdoErr === 1062) array_push($reasons, "Duplicate");
+          else array_push($reasons, "SQL: $pdoErr");
+        } else array_push($reasons, "{$e->getCode()}");
       }
     }
 
@@ -291,26 +302,48 @@ class User implements JsonSerializable
       $stmt->bindValue(":PAS", password_hash($password, PASSWORD_DEFAULT));
       $stmt->bindValue(":ID", $this->id);
       try {
-        if (!$stmt->execute()) array_push($failed, "password");
+        if (!$stmt->execute()) {
+          array_push($failed, "password");
+          array_push($reasons, "generic");
+        }
       } catch (Exception $e) {
         array_push($failed, "password");
+        if ($e->getCode() === "23000") {
+          $pdoErr = $stmt->errorInfo()[1];
+          if ($pdoErr === 1062) array_push($reasons, "Duplicate");
+          else array_push($reasons, "SQL: $pdoErr");
+        } else array_push($reasons, "{$e->getCode()}");
       }
     }
 
-    if (!empty($image)) {
-      $destinationFilename = sprintf('%s.%s', uniqid(), $image->getExtension());
-      $image->move(Config::getStoragePath() . "profilbilder/$destinationFilename");
+    if (!empty($email)) {
+      // $destinationFilename = sprintf('%s.%s', uniqid(), $image->getExtension());
+      // $image->move(Config::getStoragePath() . "profilbilder/$destinationFilename");
 
-      $stmt = $db->prepare("UPDATE egb_benutzer SET image = :IMG WHERE id = :ID");
-      $stmt->bindValue(":IMG", $destinationFilename);
+      $stmt = $db->prepare("UPDATE egb_benutzer SET email = :EMA WHERE id = :ID");
+      $stmt->bindValue(":EMA", $email);
       $stmt->bindValue(":ID", $this->id);
       try {
-        if (!$stmt->execute()) array_push($failed, "image");
+        if (!$stmt->execute()) {
+          array_push($failed, "email");
+          array_push($reasons, "generic");
+        }
       } catch (Exception $e) {
-        array_push($failed, "image");
+        array_push($failed, "email");
+        if ($e->getCode() === "23000") {
+          $pdoErr = $stmt->errorInfo()[1];
+          if ($pdoErr === 1062) array_push($reasons, "Duplicate");
+          else array_push($reasons, "SQL: $pdoErr");
+        } else array_push($reasons, "{$e->getCode()}");
       }
     }
-    if (count($failed) > 0) throw ApiError::failedUpdate($failed);
+    if (count($failed) > 0) {
+      $db->rollBack();
+
+      throw ApiError::failedUpdate($failed, $reasons);
+    }
+
+    $db->commit();
 
     return User::getByID($this->id);
   }