diff --git a/code/backend/nest_backend/routes/repository/alerts/alert.py b/code/backend/nest_backend/routes/repository/alerts/alert.py
index dea557f..de55f54 100644
--- a/code/backend/nest_backend/routes/repository/alerts/alert.py
+++ b/code/backend/nest_backend/routes/repository/alerts/alert.py
@@ -50,7 +50,7 @@ def page_alert(aid):
         security:
         - jwt: []
         responses:
-            '200':
+            '204':
                 description: The repository has been deleted successfully.
             '404':
                 description: Could not find the requested repository.
@@ -88,7 +88,7 @@ def page_alert(aid):
           schema: AlertParameterSchema
 
         responses:
-            '200':
+            '204':
                 description: The alert has been updated successfully.
                 content:
                     application/json:
@@ -131,14 +131,14 @@ def page_alert(aid):
         if 'window_size' in request.json:
             alert.window_size = request.json['window_size']
         ext.session.commit()
-        return json_success(alert.to_json()), 200
+        return json_success(alert.to_json()), 204
     elif request.method == "DELETE":
         try:
             ext.session.delete(alert)
             ext.session.commit()
         except Exception:
             return json_error("Something went wrong while deleting alert."), 500
-        return json_success("Deletion completed."), 200
+        return json_success("Deletion completed."), 204
     elif request.method == "PUT":
         if not json_request_authorizer(request.json, alert):
             return json_error("Missing one or more parameters in repository json."), 400
@@ -185,6 +185,7 @@ def page_alert(aid):
             return json_error("One of the provided IDs is incorrect"), 404
         except KeyError:
             return json_error("Unknown field specified."), 400
+        return json_success(alert.to_json()), 200
 
 
 def create_node(node, ext, json, id):
diff --git a/code/backend/nest_backend/routes/repository/alerts/repository_alerts.py b/code/backend/nest_backend/routes/repository/alerts/repository_alerts.py
index bff0a20..ebee173 100644
--- a/code/backend/nest_backend/routes/repository/alerts/repository_alerts.py
+++ b/code/backend/nest_backend/routes/repository/alerts/repository_alerts.py
@@ -48,7 +48,7 @@ def page_repository_alerts(rid):
                 application/json:
                     schema: CreateAlert
         responses:
-            '200':
+            '201':
                 description: The alert has been created successfully.
                 content:
                     application/json:
@@ -89,4 +89,4 @@ def page_repository_alerts(rid):
         ext.session.add(alert)
         ext.session.commit()
 
-        return json_success(alert.to_json()), 200
+        return json_success(alert.to_json()), 201
diff --git a/code/backend/nest_backend/routes/repository/conditions/condition.py b/code/backend/nest_backend/routes/repository/conditions/condition.py
index 3754abb..b04ccad 100644
--- a/code/backend/nest_backend/routes/repository/conditions/condition.py
+++ b/code/backend/nest_backend/routes/repository/conditions/condition.py
@@ -48,7 +48,7 @@ def page_condition(cid):
         security:
         - jwt: []
         responses:
-            '200':
+            '204':
                 description: The deletion was successful.
             '401':
                 description: The user is not logged in.
@@ -80,7 +80,7 @@ def page_condition(cid):
                 application/json:
                     schema: CreateCondition
         responses:
-            '200':
+            '204':
                 description: The user is not logged in.
                 content:
                     application/json:
@@ -124,8 +124,8 @@ def page_condition(cid):
         if content := request.json.get("content"):
             condition.content = content
         ext.session.commit()
-        return json_success(condition.to_json()), 200
+        return json_success(condition.to_json()), 204
     if request.method == "DELETE":
         ext.session.delete(condition)
         ext.session.commit()
-        return json_success("Deleted."), 200
+        return json_success("Deleted."), 204
diff --git a/code/backend/nest_backend/routes/repository/conditions/repository_conditions.py b/code/backend/nest_backend/routes/repository/conditions/repository_conditions.py
index 5ed9e03..298fab2 100644
--- a/code/backend/nest_backend/routes/repository/conditions/repository_conditions.py
+++ b/code/backend/nest_backend/routes/repository/conditions/repository_conditions.py
@@ -49,7 +49,7 @@ def page_repository_conditions(rid):
                 application/json:
                     schema: CreateCondition
         responses:
-            '200':
+            '201':
                 description: The user has been created successfully.
                 content:
                     application/json:
@@ -95,4 +95,4 @@ def page_repository_conditions(rid):
         extension_sqlalchemy.session.add(condition)
         extension_sqlalchemy.session.commit()
 
-        return json_success(condition.to_json()), 200
+        return json_success(condition.to_json()), 201
diff --git a/code/backend/nest_backend/routes/repository/repositories.py b/code/backend/nest_backend/routes/repository/repositories.py
index 630c1bf..1596ba6 100644
--- a/code/backend/nest_backend/routes/repository/repositories.py
+++ b/code/backend/nest_backend/routes/repository/repositories.py
@@ -38,9 +38,9 @@ def page_repositories():
             required: true
             content:
                 application/json:
-                    schema: CreateRepository
+                    schema: Repository
         responses:
-            '200':
+            '201':
                 description: The user has been created successfully.
                 content:
                     application/json:
@@ -73,10 +73,25 @@ def page_repositories():
         return json_success({"owner": [r.to_json() for r in owner],
                              "spectator": [r.repository.to_json() for r in spectator]})
     elif request.method == "POST":
+        # Users will be tolerated if they change parameters they're not supposed to touch. We'll ignore them for now.
+        if not request.json.get("name") or not request.json.get("conditions") or not request.json.get("evaluation_mode"):
+            return json_error("Missing arguments."), 400
         name = request.json.get("name")
-        if not name:
-            return json_error("Missing one or more parameters"), 400
-        repository = Repository(name=name, owner_id=user.email)
+        try:
+            evaluation_mode = ConditionMode(request.json['evaluation_mode'])
+        except KeyError:
+            return json_error("Unknown `type` specified."), 400
+        repository = Repository(name=name, owner_id=user.email, is_active=False, evaluation_mode=evaluation_mode)
         ext.session.add(repository)
         ext.session.commit()
-        return json_success(repository.to_json()), 200
+        ids = [c['id'] for c in request.json['conditions'] if c['id']]
+        # Create brand new conditions
+        for c in request.json['conditions']:
+            if not c['id']:
+                try:
+                    type_ = ConditionType(c['type'])
+                except KeyError:
+                    return json_error("Unknown `type` specified."), 400
+                ext.session.add(Condition(type=type_, content=c['content'], repository_id=repository.id))
+                ext.session.commit()
+        return json_success(repository.to_json()), 201
diff --git a/code/backend/nest_backend/routes/repository/repository.py b/code/backend/nest_backend/routes/repository/repository.py
index e21c7e1..5a97927 100644
--- a/code/backend/nest_backend/routes/repository/repository.py
+++ b/code/backend/nest_backend/routes/repository/repository.py
@@ -50,7 +50,7 @@ def page_repository(rid):
         security:
         - jwt: []
         responses:
-            '200':
+            '204':
                 description: The repository has been deleted successfully.
             '404':
                 description: Could not find the requested repository.
@@ -88,7 +88,7 @@ def page_repository(rid):
           schema: IntegerParameterSchema
 
         responses:
-            '200':
+            '204':
                 description: The repository has been updated successfully.
                 content:
                     application/json:
@@ -175,7 +175,7 @@ def page_repository(rid):
                 return json_error("Unknown `type` specified."), 400
             repository.evaluation_mode = evaluation_mode
         ext.session.commit()
-        return json_success(repository.to_json()), 200
+        return json_success(repository.to_json()), 204
     elif request.method == "DELETE":
         if repository.owner_id != user.email and not user.isAdmin:
             return json_error("You are not the owner of this repository."), 403
@@ -185,7 +185,7 @@ def page_repository(rid):
         except Exception as e:
             ext.session.rollback()
             return json_error("Cant delete repository because of dependencies."), 500
-        return json_success("Success"), 200
+        return json_success("Success"), 204
     elif request.method == "PUT":
         if not json_request_authorizer(request.json, repository):
             return json_error("Missing one or more parameters in repository json."), 400
diff --git a/code/backend/nest_backend/routes/users/user.py b/code/backend/nest_backend/routes/users/user.py
index 4cbb6da..e8c684d 100644
--- a/code/backend/nest_backend/routes/users/user.py
+++ b/code/backend/nest_backend/routes/users/user.py
@@ -48,7 +48,7 @@ def page_user(email):
         security:
         - jwt: []
         responses:
-            '200':
+            '204':
                 description: The user has been deleted successfully.
             '404':
                 description: Could not find the requested user.
@@ -86,7 +86,7 @@ def page_user(email):
         security:
         - jwt: []
         responses:
-            '200':
+            '204':
                 description: The user has been updated successfully.
                 content:
                     application/json:
@@ -133,7 +133,7 @@ def page_user(email):
         except Exception:
             ext.session.rollback()
             return json_error("Could not delete the user."), 500
-        return json_success("The user has been deleted."), 200
+        return json_success("The user has been deleted."), 204
     elif request.method == "PATCH":
         if not email == user.email and not user.isAdmin:
             return json_error("Thou art not authorized."), 403
@@ -143,4 +143,4 @@ def page_user(email):
         if request.json.get("password"):
             target.password = gen_password(request.json.get("password"))
         ext.session.commit()
-        return json_success(target.to_json()), 200
+        return json_success(target.to_json()), 204
diff --git a/code/backend/nest_backend/routes/users/users.py b/code/backend/nest_backend/routes/users/users.py
index e8764c4..04a83ad 100644
--- a/code/backend/nest_backend/routes/users/users.py
+++ b/code/backend/nest_backend/routes/users/users.py
@@ -39,7 +39,7 @@ def page_users():
                 application/json:
                     schema: CreateUser
         responses:
-            '200':
+            '201':
                 description: The user has been created successfully.
                 content:
                     application/json:
@@ -62,7 +62,7 @@ def page_users():
         if not user.isAdmin:
             return json_error("User is not admin. Thou art not authorized"), 403
         users = User.query.all()
-        return json_success([user.to_json() for user in users])
+        return json_success([user.to_json() for user in users]), 200
     if request.method == "POST":
         if not user.isAdmin:
             return json_error("User is not admin. Thou art not authorized."), 403
@@ -70,4 +70,4 @@ def page_users():
                         username=request.json.get("username"))
         ext.session.add(new_user)
         ext.session.commit()
-        return json_success(new_user.to_json())
+        return json_success(new_user.to_json()), 201