diff --git a/.gitignore b/.gitignore
index e91237ad7..cb73be599 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,4 +41,7 @@ tunnel.log
 /.well-known-cache
 /**/tmp-*
 /testdata/bigAlloc_*.csv
-/sessions
\ No newline at end of file
+/sessions
+/changelog.json
+/.current-version
+/.current-changelog.md
\ No newline at end of file
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5ba71103e..a6a0e7ac3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,3 +1,9 @@
+workflow:
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "push"'
+      when: always
+    - when: never
+
 default:
   image:
     name: fpco/stack-build:lts-16.11
@@ -21,6 +27,7 @@ variables:
   UPLOAD_S3_KEY_ID: gOel7KvadwNKgjjy
   UPLOAD_S3_KEY: ugO5pkEla7F0JW9MdPwLi4MWLT5ZbqAL
   N_PREFIX: "${HOME}/.n"
+  PACKAGE_REGISTRY_URL: "${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/packages/generic/uni2work"
   
 stages:
   - setup
@@ -28,7 +35,10 @@ stages:
   - yesod:build
   - lint
   - test
-  - deploy
+  - prepare release
+  - upload packages
+  - release
+#  - deploy
   
 npm install:
   stage: setup
@@ -51,7 +61,7 @@ npm install:
   artifacts:
     paths:
       - node_modules/
-    name: "${CI_JOB_NAME}"
+    name: "${CI_JOB_NAME}-${CI_COMMIT_SHORT_SHA}"
     expire_in: "1 day"
   retry: 2
   interruptible: true
@@ -68,7 +78,7 @@ frontend:build:
       - static
       - well-known
       - config/webpack.yml
-    name: "${CI_JOB_NAME}"
+    name: "${CI_JOB_NAME}-${CI_COMMIT_SHORT_SHA}"
     expire_in: "1 day"
   dependencies:
     - npm install
@@ -112,14 +122,16 @@ yesod:build:dev:
   artifacts:
     paths:
       - bin/
-    name: "${CI_JOB_NAME}"
+    name: "${CI_JOB_NAME}-${CI_COMMIT_SHORT_SHA}"
     expire_in: "1 week"
   dependencies:
     - frontend:build
 
-  only:
-    variables:
-      - $CI_COMMIT_REF_NAME !~ /^v[0-9].*/
+  rules:
+    - if: $CI_COMMIT_REF_NAME =~ /(^v[0-9].*)|((^|\/)profile($|\/))/
+      when: manual
+    - when: always
+
   retry: 2
   interruptible: true
     
@@ -135,13 +147,42 @@ yesod:build:
   artifacts:
     paths:
       - bin/
-    name: "${CI_JOB_NAME}"
+    name: "${CI_JOB_NAME}-${CI_COMMIT_SHORT_SHA}"
   dependencies:
     - frontend:build
     
-  only:
-    variables:
-      - $CI_COMMIT_REF_NAME =~ /^v[0-9].*/
+  rules:
+    - if: $CI_COMMIT_REF_NAME =~ /^v[0-9].*/
+      when: always
+    - when: manual
+
+  retry: 2
+  interruptible: true
+  resource_group: ram
+  
+yesod:build:profile:
+  cache:
+    <<: *global_cache
+    policy: pull
+
+  stage: yesod:build
+  script:
+    - stack build --profile --copy-bins --local-bin-path $(pwd)/bin --flag uniworx:-library-only --flag uniworx:-dev --flag uniworx:pedantic --no-strip
+  needs:
+    - frontend:build
+  before_script: *haskell
+  artifacts:
+    paths:
+      - bin/
+    name: "${CI_JOB_NAME}-${CI_COMMIT_SHORT_SHA}"
+  dependencies:
+    - frontend:build
+
+  rules:
+    - if: $CI_COMMIT_REF_NAME =~ /(^|\/)profile($|\/)/
+      when: always
+    - when: manual
+
   retry: 2
   interruptible: true
   resource_group: ram
@@ -170,28 +211,106 @@ frontend:test:
   retry: 2
   interruptible: true
 
-deploy:uniworx3:
+parse-changelog:
   cache: {}
-  stage: deploy
-  variables:
-    GIT_STRATEGY: none
-  script:
-    - zip -qj - bin/uniworx bin/uniworxdb | ssh root@uniworx3.ifi.lmu.de /root/bin/accept_uni2work
+  stage: prepare release
+  dependencies:
+    - npm install
   needs:
-    - yesod:build
-    - frontend:test # For sanity
+    - npm install
+  rules:
+    - if: $CI_COMMIT_REF_NAME =~ /^v[0-9].*/
+      when: always
   before_script:
     - rm -rvf /etc/apt/sources.list /etc/apt/sources.list.d
     - install -v -T -m 0644 ${APT_SOURCES_LIST} /etc/apt/sources.list
     - apt-get update -y
-    - apt-get install -y --no-install-recommends openssh-client
-    - install -v -m 0700 -d ~/.ssh
-    - install -v -T -m 0644 ${SSH_KNOWN_HOSTS} ~/.ssh/known_hosts
-    - install -v -T -m 0400 ${SSH_PRIVATE_KEY_UNIWORX3} ~/.ssh/uniworx3; echo "IdentityFile ~/.ssh/uniworx3" >> ~/.ssh/config; 
+    - apt-get install -y --no-install-recommends jq
+  script:
+    - npm run parse-changelog
+    - |
+      jq -r '.versions[0].version' changelog.json > .current-version
+    - |
+      jq -r '.versions[0].body' changelog.json > .current-changelog.md
+  artifacts:
+    paths:
+      - .current-version
+      - .current-changelog.md
+    name: "changelog-${CI_COMMIT_SHORT_SHA}"
+    expire_in: "1 day"
+  retry: 2
+  interruptible: true
+
+upload:
+  cache: {}
+  stage: upload packages
+  image: curlimages/curl:latest
+  needs:
+    - yesod:build
+    - parse-changelog
   dependencies:
     - yesod:build
+    - parse-changelog
+  rules:
+    - if: $CI_COMMIT_REF_NAME =~ /^v[0-9].*/
+      when: always
+  before_script:
+    - export VERSION="$(cat .current-version)"
+  script:
+    - |
+      curl --header "JOB-TOKEN: ${CI_JOB_TOKEN}" --upload-file bin/uniworx ${PACKAGE_REGISTRY_URL}/${VERSION}/uniworx
+    - |
+      curl --header "JOB-TOKEN: ${CI_JOB_TOKEN}" --upload-file bin/uniworxdb ${PACKAGE_REGISTRY_URL}/${VERSION}/uniworxdb
+    - |
+      curl --header "JOB-TOKEN: ${CI_JOB_TOKEN}" --upload-file bin/uniworxload ${PACKAGE_REGISTRY_URL}/${VERSION}/uniworxload
+    - |
+      curl --header "JOB-TOKEN: ${CI_JOB_TOKEN}" --upload-file bin/uniworx-wflint ${PACKAGE_REGISTRY_URL}/${VERSION}/uniworx-wflint
+
+release:
+  cache: {}
+  stage: release
+  image: registry.gitlab.com/gitlab-org/release-cli:latest
+  needs:
+    - upload
+    - parse-changelog
+  dependencies:
+    - parse-changelog
+  rules:
+    - if: $CI_COMMIT_REF_NAME =~ /^v[0-9].*/
+      when: always
+  before_script:
+    - export VERSION="$(cat .current-version)"
+  script:
+    - |
+      release-cli create --name "${VERSION}" --tag-name $CI_COMMIT_TAG --description ./current-changelog.md  \
+        --assets-link "{\"name\":\"uniworx\",\"url\":\"${PACKAGE_REGISTRY_URL}/${VERSION}/uniworx\",\"filepath\":\"uniworx\"}" \
+        --assets-link "{\"name\":\"uniworxdb\",\"url\":\"${PACKAGE_REGISTRY_URL}/${VERSION}/uniworxdb\",\"filepath\":\"uniworxdb\"}" \
+        --assets-link "{\"name\":\"uniworxload\",\"url\":\"${PACKAGE_REGISTRY_URL}/${VERSION}/uniworxload\",\"filepath\":\"uniworxload\"}" \
+        --assets-link "{\"name\":\"uniworx-wflint\",\"url\":\"${PACKAGE_REGISTRY_URL}/${VERSION}/uniworx-wflint\",\"filepath\":\"uniworx-wflint\"}"
+
+
+# deploy:uniworx3:
+#   cache: {}
+#   stage: deploy
+#   variables:
+#     GIT_STRATEGY: none
+#   script:
+#     - zip -qj - bin/uniworx bin/uniworxdb | ssh root@uniworx3.ifi.lmu.de /root/bin/accept_uni2work
+#   needs:
+#     - yesod:build
+#     - frontend:test # For sanity
+#   before_script:
+#     - rm -rvf /etc/apt/sources.list /etc/apt/sources.list.d
+#     - install -v -T -m 0644 ${APT_SOURCES_LIST} /etc/apt/sources.list
+#     - apt-get update -y
+#     - apt-get install -y --no-install-recommends openssh-client
+#     - install -v -m 0700 -d ~/.ssh
+#     - install -v -T -m 0644 ${SSH_KNOWN_HOSTS} ~/.ssh/known_hosts
+#     - install -v -T -m 0400 ${SSH_PRIVATE_KEY_UNIWORX3} ~/.ssh/uniworx3; echo "IdentityFile ~/.ssh/uniworx3" >> ~/.ssh/config; 
+#   dependencies:
+#     - yesod:build
         
-  only:
-    variables:
-      - $CI_COMMIT_REF_NAME =~ /^v[0-9].*/
-  resource_group: uniworx3
+#   only:
+#     variables:
+#       - $CI_COMMIT_REF_NAME =~ /^v[0-9].*/
+#   resource_group: uniworx3
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44f426919..e22590a6d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,53 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [24.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v24.1.1...v24.1.2) (2021-02-09)
+
+## [24.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v24.1.0...v24.1.1) (2021-02-09)
+
+## [24.1.0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v24.0.0...v24.1.0) (2021-02-08)
+
+
+### Features
+
+* ensure cached study feature relevance is up to date ([8798f54](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/8798f547a60a7fa7c0849e20e1b0e9d012ac9312))
+
+
+### Bug Fixes
+
+* restore storting for exam-office exams ([5698e9c](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/5698e9ca0bb19585b9a9d2d3c10f8b5f99ae5db9))
+
+## [24.0.0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.7.0...v24.0.0) (2021-02-01)
+
+
+### ⚠ BREAKING CHANGES
+
+* **jobs:** Job offloading
+
+### Features
+
+* **jobs:** batch job offloading ([09fb26f](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/09fb26f1a892feba32185166223f8f95611ea9ef))
+
+
+### Bug Fixes
+
+* **workflows:** don't cache instance-list empty for correctness ([cb1e715](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/cb1e715e9b2da2f5ac0bd03b636de0f961307efd))
+
+## [23.7.0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.6.0...v23.7.0) (2021-01-27)
+
+
+### Features
+
+* **dbtable:** extra representations ([2c0fc63](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/2c0fc63be1de02e8acffbc6a9c5ee83b061c5825))
+* **exams:** exam sheets ([500000b](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/500000ba0f6f3b3c32cfd7593e5468796660d46b))
+
+
+### Bug Fixes
+
+* more verbose watchdog notification failures ([48028c4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/48028c40532577f74430340ed924af7116b8bd96))
+* **mass-input:** properly escape query selector ([9a3f401](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/9a3f401b38e86e2f9e7fa722698a437d853b422e))
+* nonmoving-gc still segfaults ([c404ce9](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/c404ce9b3529cf402a0f9d649ca3299df09ba089))
+
 ## [23.6.0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.5.0...v23.6.0) (2020-12-15)
 
 
@@ -23,16 +70,16 @@ All notable changes to this project will be documented in this file. See [standa
 * **tokens:** introduce clock leniency and remove start for downloads ([8939a8b](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/8939a8b90a39a26614da18dd3985aee253cd191f))
 * hopefully improve workflow auth performance ([1d3fd8c](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/1d3fd8c8a7824d6c6d043f4114067238af4bdc6e))
 
-### [23.4.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.4.2...v23.4.3) (2020-12-10)
+## [23.4.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.4.2...v23.4.3) (2020-12-10)
 
-### [23.4.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.4.1...v23.4.2) (2020-12-10)
+## [23.4.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.4.1...v23.4.2) (2020-12-10)
 
 
 ### Bug Fixes
 
 * hopefully speed up aeson via ffi ([a00ba10](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/a00ba10e9cf1ffa534908b9125730e88179052eb))
 
-### [23.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.4.0...v23.4.1) (2020-12-10)
+## [23.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.4.0...v23.4.1) (2020-12-10)
 
 ## [23.4.0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.3.0...v23.4.0) (2020-12-09)
 
@@ -55,14 +102,14 @@ All notable changes to this project will be documented in this file. See [standa
 * **admin-crontab:** export as json ([bbd4916](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/bbd4916f3a556ce4c05eb3b2b5268c9c072fdfdd))
 * **jobs:** queue by jobctl priority ([a27a553](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/a27a553e0a9782eda6023ec0b8b1055757bb511f))
 
-### [23.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.2.1...v23.2.2) (2020-12-09)
+## [23.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.2.1...v23.2.2) (2020-12-09)
 
 
 ### Bug Fixes
 
 * **jobs:** adjust job handling to hopefully reduce load ([ed38f93](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/ed38f93537b57b5b3e4563dc0259d805760071bc))
 
-### [23.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.2.0...v23.2.1) (2020-12-08)
+## [23.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.2.0...v23.2.1) (2020-12-08)
 
 
 ### Bug Fixes
@@ -82,14 +129,14 @@ All notable changes to this project will be documented in this file. See [standa
 
 * **auth:** fix infinite auth loop for workflow files ([21cf6cf](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/21cf6cfa873b841c2f9f8ab9f69c08ea72fc2420))
 
-### [23.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.1.1...v23.1.2) (2020-12-05)
+## [23.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.1.1...v23.1.2) (2020-12-05)
 
 
 ### Bug Fixes
 
 * submission download token generation broke viewing ([e1b6084](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/e1b60844cb77b1fd41900d0a3c4829ba21b6b3fe))
 
-### [23.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.1.0...v23.1.1) (2020-12-05)
+## [23.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.1.0...v23.1.1) (2020-12-05)
 
 
 ### Bug Fixes
@@ -118,7 +165,7 @@ All notable changes to this project will be documented in this file. See [standa
 * **tests:** generate sensible WorkflowPayloadLabels ([8a888d3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/8a888d3945f0fd0d67ef83bae621744c943b99de))
 * **workflows:** properly offer previous payload files ([aa0404a](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/aa0404a0075acbcd4c6f94984acdbb4d68f08d0a))
 
-### [23.0.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.0.2...v23.0.3) (2020-11-29)
+## [23.0.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.0.2...v23.0.3) (2020-11-29)
 
 
 ### Bug Fixes
@@ -129,7 +176,7 @@ All notable changes to this project will be documented in this file. See [standa
 * build ([43bb0ab](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/43bb0abe7218f6d43b52d9a64e62f0dc29b9972e))
 * **rooms:** honor roomHidden ([ed5d871](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/ed5d871182954e2f0a9a5063f61277d925628c40))
 
-### [23.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.0.1...v23.0.2) (2020-11-28)
+## [23.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.0.1...v23.0.2) (2020-11-28)
 
 
 ### Bug Fixes
@@ -137,7 +184,7 @@ All notable changes to this project will be documented in this file. See [standa
 * **tests:** remove invalid claim of commutativity ([d2f0361](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/d2f0361e49114e6dc6c55e64b677b8c842e93bee))
 * build ([23a21b9](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/23a21b905c902bea5fe88abd84da600e757a194e))
 
-### [23.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.0.0...v23.0.1) (2020-11-27)
+## [23.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v23.0.0...v23.0.1) (2020-11-27)
 
 
 ### Bug Fixes
@@ -196,7 +243,7 @@ Also improve efficiency of marking workflow files as referenced
 * **workflows:** refer by id in model ([94f78a0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/94f78a07d9376670122a2adce01cf7180a64d33d))
 * **workflows:** ui improvements ([c7f4fa0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/c7f4fa0e412d2b920a3819ffed5b79b8aeea2842))
 
-### [22.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v22.1.0...v22.1.1) (2020-11-14)
+## [22.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v22.1.0...v22.1.1) (2020-11-14)
 
 ## [22.1.0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v22.0.0...v22.1.0) (2020-11-10)
 
@@ -222,7 +269,7 @@ Also improve efficiency of marking workflow files as referenced
 
 * **html-field:** introduce stored-markup ([e25e8a2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/e25e8a2f4ca65afc29acc8a3884df9acf77d4398))
 
-### [21.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v21.1.0...v21.1.1) (2020-11-06)
+## [21.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v21.1.0...v21.1.1) (2020-11-06)
 
 
 ### Bug Fixes
@@ -236,21 +283,21 @@ Also improve efficiency of marking workflow files as referenced
 
 * **sheets:** upload-empty-ok ([ab1940c](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/ab1940cb09e824fbba03264b5451fa8b17c5c804))
 
-### [21.0.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v21.0.2...v21.0.3) (2020-11-05)
+## [21.0.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v21.0.2...v21.0.3) (2020-11-05)
 
 
 ### Bug Fixes
 
 * **mails:** prevent emails being resent to due archiving errors ([8cf39dc](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/8cf39dcbe68cefcc50691ae8a7194315d18420d6))
 
-### [21.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v21.0.1...v21.0.2) (2020-11-04)
+## [21.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v21.0.1...v21.0.2) (2020-11-04)
 
 
 ### Bug Fixes
 
 * build ([fa61b46](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/fa61b46d308753354623df17241b5312f324321e))
 
-### [21.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v21.0.0...v21.0.1) (2020-11-04)
+## [21.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v21.0.0...v21.0.1) (2020-11-04)
 
 
 ### Bug Fixes
@@ -301,7 +348,7 @@ Also improve efficiency of marking workflow files as referenced
 
 * **allocations:** fix allocation-course-accept-substitutes ([b4df980](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/b4df98069982752e36e69571f5557a6179b44cff))
 
-### [20.12.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.12.0...v20.12.1) (2020-10-14)
+## [20.12.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.12.0...v20.12.1) (2020-10-14)
 
 
 ### Bug Fixes
@@ -316,7 +363,7 @@ Also improve efficiency of marking workflow files as referenced
 
 * **ldap:** expose active directory errors ([51ed7e0](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/51ed7e0a26a94d2178a4ca10ad7ea36b99076b54))
 
-### [20.11.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.11.0...v20.11.1) (2020-10-14)
+## [20.11.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.11.0...v20.11.1) (2020-10-14)
 
 
 ### Bug Fixes
@@ -351,7 +398,7 @@ Also improve efficiency of marking workflow files as referenced
 * **exams:** auth ExamResults by ExamExamOfficeSchools ([29a3e24](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/29a3e24bcf01cd9c893857eda00dcd249e6cbbe2))
 * **exams:** exam staff & additional schools ([94436ee](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/94436ee0e1ce2cbf13a66f9ad81883d7286acb9b))
 
-### [20.8.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.8.0...v20.8.1) (2020-10-12)
+## [20.8.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.8.0...v20.8.1) (2020-10-12)
 
 
 ### Bug Fixes
@@ -384,7 +431,7 @@ Also improve efficiency of marking workflow files as referenced
 
 * **study-features:** also apply caching to table columns ([564c0b9](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/564c0b975ae65881cb3a168855b36e4b1614a6cb))
 
-### [20.5.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.5.0...v20.5.1) (2020-09-29)
+## [20.5.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.5.0...v20.5.1) (2020-09-29)
 
 
 ### Bug Fixes
@@ -409,7 +456,7 @@ Also improve efficiency of marking workflow files as referenced
 * **allocations:** notify for new course upon registration ([9e0b43a](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/9e0b43a60d26a05f6e1b9d4dae2b2f75dd52fff1))
 * tests ([ca81f3b](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/ca81f3b0f2913431cbaf399c33ed30a21979ce69))
 
-### [20.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.4.0...v20.4.1) (2020-09-23)
+## [20.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.4.0...v20.4.1) (2020-09-23)
 
 
 ### Bug Fixes
@@ -428,14 +475,14 @@ Also improve efficiency of marking workflow files as referenced
 
 * **jobs:** better flushing, correct metrics, better etas ([e4416e7](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/e4416e7f0e2ea2cf9db0e61cf2d20c27260ccaf8))
 
-### [20.3.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.3.1...v20.3.2) (2020-09-22)
+## [20.3.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.3.1...v20.3.2) (2020-09-22)
 
 
 ### Bug Fixes
 
 * **files:** don't inject serializable ([2ca024b](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/2ca024b9351df800b57d3235c4a00776cd669952))
 
-### [20.3.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.3.0...v20.3.1) (2020-09-22)
+## [20.3.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.3.0...v20.3.1) (2020-09-22)
 
 
 ### Bug Fixes
@@ -463,7 +510,7 @@ Also improve efficiency of marking workflow files as referenced
 
 * **exam-form:** sort occurrences and parts ([6d47549](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/6d475497c0caee49ad34c5c3c6e7b1bf91ca0ba2))
 
-### [20.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.1.0...v20.1.1) (2020-09-18)
+## [20.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v20.1.0...v20.1.1) (2020-09-18)
 
 
 ### Bug Fixes
@@ -505,7 +552,7 @@ Also improve efficiency of marking workflow files as referenced
 
 * zip handling & tests ([350ee79](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/350ee79af3c8fcc480970166a559596873beab2a))
 
-### [19.3.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.3.0...v19.3.1) (2020-09-10)
+## [19.3.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.3.0...v19.3.1) (2020-09-10)
 
 
 ### Bug Fixes
@@ -539,14 +586,14 @@ Also improve efficiency of marking workflow files as referenced
 * tests ([018d26f](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/018d26f4a1a1cf411324aeac56ce4d4203670942))
 * tests ([5541619](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/5541619372f4a4e46ccc403004e869afdfaed7b0))
 
-### [19.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.2.1...v19.2.2) (2020-08-26)
+## [19.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.2.1...v19.2.2) (2020-08-26)
 
 
 ### Bug Fixes
 
 * have exam deregistration always delete stored grades ([24f428b](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/24f428b13bb181bec99417b4e69fc538e35acbcf))
 
-### [19.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.2.0...v19.2.1) (2020-08-26)
+## [19.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.2.0...v19.2.1) (2020-08-26)
 
 
 ### Bug Fixes
@@ -568,23 +615,23 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [19.1.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.4...v19.1.5) (2020-08-19)
+## [19.1.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.4...v19.1.5) (2020-08-19)
 
 
 
-### [19.1.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.3...v19.1.4) (2020-08-18)
+## [19.1.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.3...v19.1.4) (2020-08-18)
 
 
 
-### [19.1.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.2...v19.1.3) (2020-08-17)
+## [19.1.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.2...v19.1.3) (2020-08-17)
 
 
 
-### [19.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.1...v19.1.2) (2020-08-17)
+## [19.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.1...v19.1.2) (2020-08-17)
 
 
 
-### [19.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.0...v19.1.1) (2020-08-17)
+## [19.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v19.1.0...v19.1.1) (2020-08-17)
 
 
 
@@ -728,7 +775,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [18.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v18.2.1...v18.2.2) (2020-07-23)
+## [18.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v18.2.1...v18.2.2) (2020-07-23)
 
 
 ### Bug Fixes
@@ -738,7 +785,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [18.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v18.2.0...v18.2.1) (2020-07-22)
+## [18.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v18.2.0...v18.2.1) (2020-07-22)
 
 
 
@@ -824,7 +871,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [17.6.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.4...v17.6.5) (2020-06-26)
+## [17.6.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.4...v17.6.5) (2020-06-26)
 
 
 ### Bug Fixes
@@ -833,19 +880,19 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [17.6.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.3...v17.6.4) (2020-06-24)
+## [17.6.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.3...v17.6.4) (2020-06-24)
 
 
 
-### [17.6.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.2...v17.6.3) (2020-06-24)
+## [17.6.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.2...v17.6.3) (2020-06-24)
 
 
 
-### [17.6.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.1...v17.6.2) (2020-06-24)
+## [17.6.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.1...v17.6.2) (2020-06-24)
 
 
 
-### [17.6.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.0...v17.6.1) (2020-06-24)
+## [17.6.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.6.0...v17.6.1) (2020-06-24)
 
 
 ### Bug Fixes
@@ -890,7 +937,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [17.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.4.0...v17.4.1) (2020-06-15)
+## [17.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.4.0...v17.4.1) (2020-06-15)
 
 
 
@@ -925,7 +972,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [17.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.2.0...v17.2.1) (2020-05-28)
+## [17.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.2.0...v17.2.1) (2020-05-28)
 
 
 
@@ -944,7 +991,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [17.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.1.0...v17.1.1) (2020-05-26)
+## [17.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v17.1.0...v17.1.1) (2020-05-26)
 
 
 ### Bug Fixes
@@ -1013,11 +1060,11 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [16.4.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.4.1...v16.4.2) (2020-05-13)
+## [16.4.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.4.1...v16.4.2) (2020-05-13)
 
 
 
-### [16.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.4.0...v16.4.1) (2020-05-13)
+## [16.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.4.0...v16.4.1) (2020-05-13)
 
 
 ### Bug Fixes
@@ -1045,7 +1092,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [16.3.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.3.0...v16.3.1) (2020-05-10)
+## [16.3.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.3.0...v16.3.1) (2020-05-10)
 
 
 ### Bug Fixes
@@ -1063,7 +1110,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [16.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.2.1...v16.2.2) (2020-05-08)
+## [16.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.2.1...v16.2.2) (2020-05-08)
 
 
 ### Bug Fixes
@@ -1072,7 +1119,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [16.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.2.0...v16.2.1) (2020-05-08)
+## [16.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.2.0...v16.2.1) (2020-05-08)
 
 
 ### Bug Fixes
@@ -1110,7 +1157,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [16.0.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.4...v16.0.5) (2020-05-06)
+## [16.0.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.4...v16.0.5) (2020-05-06)
 
 
 ### Bug Fixes
@@ -1119,7 +1166,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [16.0.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.3...v16.0.4) (2020-05-06)
+## [16.0.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.3...v16.0.4) (2020-05-06)
 
 
 ### Bug Fixes
@@ -1128,7 +1175,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [16.0.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.2...v16.0.3) (2020-05-05)
+## [16.0.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.2...v16.0.3) (2020-05-05)
 
 
 ### Bug Fixes
@@ -1138,7 +1185,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [16.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.1...v16.0.2) (2020-05-05)
+## [16.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.1...v16.0.2) (2020-05-05)
 
 
 ### Bug Fixes
@@ -1148,7 +1195,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [16.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.0...v16.0.1) (2020-05-05)
+## [16.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v16.0.0...v16.0.1) (2020-05-05)
 
 
 ### Bug Fixes
@@ -1177,7 +1224,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [15.6.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v15.6.0...v15.6.1) (2020-04-30)
+## [15.6.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v15.6.0...v15.6.1) (2020-04-30)
 
 
 ### Bug Fixes
@@ -1221,7 +1268,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [15.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v15.4.0...v15.4.1) (2020-04-26)
+## [15.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v15.4.0...v15.4.1) (2020-04-26)
 
 
 ### Bug Fixes
@@ -1281,7 +1328,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [15.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v15.1.1...v15.1.2) (2020-04-19)
+## [15.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v15.1.1...v15.1.2) (2020-04-19)
 
 
 ### Bug Fixes
@@ -1290,7 +1337,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [15.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v15.1.0...v15.1.1) (2020-04-17)
+## [15.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v15.1.0...v15.1.1) (2020-04-17)
 
 
 ### Bug Fixes
@@ -1442,7 +1489,7 @@ Also improve efficiency of marking workflow files as referenced
 
 
 
-### [14.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v14.1.0...v14.1.1) (2020-03-06)
+## [14.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v14.1.0...v14.1.1) (2020-03-06)
 
 
 ### Bug Fixes
@@ -1497,7 +1544,7 @@ relative when priorities are ordinal
 
 
 
-### [13.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v13.0.0...v13.0.1) (2020-02-24)
+## [13.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v13.0.0...v13.0.1) (2020-02-24)
 
 
 ### Bug Fixes
@@ -1566,7 +1613,7 @@ relative when priorities are ordinal
 
 
 
-### [11.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v11.1.0...v11.1.1) (2020-02-14)
+## [11.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v11.1.0...v11.1.1) (2020-02-14)
 
 
 ### Bug Fixes
@@ -1764,7 +1811,7 @@ relative when priorities are ordinal
 
 
 
-### [10.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v10.4.0...v10.4.1) (2020-01-17)
+## [10.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v10.4.0...v10.4.1) (2020-01-17)
 
 
 ### Bug Fixes
@@ -1874,7 +1921,7 @@ relative when priorities are ordinal
 
 
 
-### [10.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v10.0.0...v10.0.1) (2019-12-19)
+## [10.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v10.0.0...v10.0.1) (2019-12-19)
 
 
 ### Bug Fixes
@@ -1934,7 +1981,7 @@ relative when priorities are ordinal
 
 
 
-### [9.0.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v9.0.2...v9.0.3) (2019-12-03)
+## [9.0.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v9.0.2...v9.0.3) (2019-12-03)
 
 
 ### Bug Fixes
@@ -1943,7 +1990,7 @@ relative when priorities are ordinal
 
 
 
-### [9.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v9.0.1...v9.0.2) (2019-12-02)
+## [9.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v9.0.1...v9.0.2) (2019-12-02)
 
 
 ### Bug Fixes
@@ -1952,7 +1999,7 @@ relative when priorities are ordinal
 
 
 
-### [9.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v9.0.0...v9.0.1) (2019-11-28)
+## [9.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v9.0.0...v9.0.1) (2019-11-28)
 
 
 ### Bug Fixes
@@ -1975,7 +2022,7 @@ relative when priorities are ordinal
 
 
 
-### [8.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v8.0.0...v8.0.1) (2019-11-27)
+## [8.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v8.0.0...v8.0.1) (2019-11-27)
 
 
 ### Bug Fixes
@@ -2013,7 +2060,7 @@ relative when priorities are ordinal
 
 
 
-### [7.25.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.25.0...v7.25.1) (2019-11-22)
+## [7.25.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.25.0...v7.25.1) (2019-11-22)
 
 
 
@@ -2043,7 +2090,7 @@ relative when priorities are ordinal
 
 
 
-### [7.23.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.23.1...v7.23.2) (2019-11-19)
+## [7.23.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.23.1...v7.23.2) (2019-11-19)
 
 
 ### Bug Fixes
@@ -2053,7 +2100,7 @@ relative when priorities are ordinal
 
 
 
-### [7.23.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.23.0...v7.23.1) (2019-11-19)
+## [7.23.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.23.0...v7.23.1) (2019-11-19)
 
 
 ### Bug Fixes
@@ -2080,7 +2127,7 @@ relative when priorities are ordinal
 
 
 
-### [7.22.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.22.0...v7.22.1) (2019-11-14)
+## [7.22.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.22.0...v7.22.1) (2019-11-14)
 
 
 
@@ -2102,23 +2149,23 @@ relative when priorities are ordinal
 
 
 
-### [7.21.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.4...v7.21.5) (2019-11-13)
+## [7.21.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.4...v7.21.5) (2019-11-13)
 
 
 
-### [7.21.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.3...v7.21.4) (2019-11-13)
+## [7.21.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.3...v7.21.4) (2019-11-13)
 
 
 
-### [7.21.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.2...v7.21.3) (2019-11-13)
+## [7.21.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.2...v7.21.3) (2019-11-13)
 
 
 
-### [7.21.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.1...v7.21.2) (2019-11-12)
+## [7.21.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.1...v7.21.2) (2019-11-12)
 
 
 
-### [7.21.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.0...v7.21.1) (2019-11-11)
+## [7.21.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.21.0...v7.21.1) (2019-11-11)
 
 
 
@@ -2187,7 +2234,7 @@ relative when priorities are ordinal
 
 
 
-### [7.19.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.19.1...v7.19.2) (2019-10-28)
+## [7.19.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.19.1...v7.19.2) (2019-10-28)
 
 
 ### Bug Fixes
@@ -2196,7 +2243,7 @@ relative when priorities are ordinal
 
 
 
-### [7.19.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.19.0...v7.19.1) (2019-10-25)
+## [7.19.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.19.0...v7.19.1) (2019-10-25)
 
 
 ### Bug Fixes
@@ -2219,7 +2266,7 @@ relative when priorities are ordinal
 
 
 
-### [7.18.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.18.2...v7.18.3) (2019-10-23)
+## [7.18.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.18.2...v7.18.3) (2019-10-23)
 
 
 ### Bug Fixes
@@ -2228,11 +2275,11 @@ relative when priorities are ordinal
 
 
 
-### [7.18.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.18.1...v7.18.2) (2019-10-20)
+## [7.18.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.18.1...v7.18.2) (2019-10-20)
 
 
 
-### [7.18.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.18.0...v7.18.1) (2019-10-20)
+## [7.18.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.18.0...v7.18.1) (2019-10-20)
 
 
 ### Bug Fixes
@@ -2256,7 +2303,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.14](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.13...v7.17.14) (2019-10-17)
+## [7.17.14](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.13...v7.17.14) (2019-10-17)
 
 
 ### Bug Fixes
@@ -2265,7 +2312,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.13](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.12...v7.17.13) (2019-10-17)
+## [7.17.13](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.12...v7.17.13) (2019-10-17)
 
 
 ### Bug Fixes
@@ -2274,11 +2321,11 @@ relative when priorities are ordinal
 
 
 
-### [7.17.12](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.11...v7.17.12) (2019-10-17)
+## [7.17.12](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.11...v7.17.12) (2019-10-17)
 
 
 
-### [7.17.11](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.10...v7.17.11) (2019-10-16)
+## [7.17.11](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.10...v7.17.11) (2019-10-16)
 
 
 ### Bug Fixes
@@ -2287,7 +2334,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.10](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.9...v7.17.10) (2019-10-16)
+## [7.17.10](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.9...v7.17.10) (2019-10-16)
 
 
 ### Bug Fixes
@@ -2296,7 +2343,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.9](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.8...v7.17.9) (2019-10-16)
+## [7.17.9](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.8...v7.17.9) (2019-10-16)
 
 
 ### Bug Fixes
@@ -2305,7 +2352,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.8](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.7...v7.17.8) (2019-10-16)
+## [7.17.8](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.7...v7.17.8) (2019-10-16)
 
 
 ### Bug Fixes
@@ -2314,7 +2361,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.7](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.6...v7.17.7) (2019-10-15)
+## [7.17.7](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.6...v7.17.7) (2019-10-15)
 
 
 ### Bug Fixes
@@ -2323,7 +2370,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.6](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.5...v7.17.6) (2019-10-15)
+## [7.17.6](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.5...v7.17.6) (2019-10-15)
 
 
 ### Bug Fixes
@@ -2332,7 +2379,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.4...v7.17.5) (2019-10-15)
+## [7.17.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.4...v7.17.5) (2019-10-15)
 
 
 ### Bug Fixes
@@ -2341,7 +2388,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.3...v7.17.4) (2019-10-15)
+## [7.17.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.3...v7.17.4) (2019-10-15)
 
 
 ### Bug Fixes
@@ -2350,11 +2397,11 @@ relative when priorities are ordinal
 
 
 
-### [7.17.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.2...v7.17.3) (2019-10-14)
+## [7.17.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.2...v7.17.3) (2019-10-14)
 
 
 
-### [7.17.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.1...v7.17.2) (2019-10-14)
+## [7.17.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.1...v7.17.2) (2019-10-14)
 
 
 ### Bug Fixes
@@ -2363,7 +2410,7 @@ relative when priorities are ordinal
 
 
 
-### [7.17.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.0...v7.17.1) (2019-10-14)
+## [7.17.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.17.0...v7.17.1) (2019-10-14)
 
 
 ### Bug Fixes
@@ -2401,7 +2448,7 @@ relative when priorities are ordinal
 
 
 
-### [7.14.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.14.0...v7.14.1) (2019-10-13)
+## [7.14.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.14.0...v7.14.1) (2019-10-13)
 
 
 ### Bug Fixes
@@ -2490,7 +2537,7 @@ relative when priorities are ordinal
 
 
 
-### [7.9.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.9.0...v7.9.1) (2019-10-07)
+## [7.9.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.9.0...v7.9.1) (2019-10-07)
 
 
 ### Bug Fixes
@@ -2508,7 +2555,7 @@ relative when priorities are ordinal
 
 
 
-### [7.8.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.4...v7.8.5) (2019-10-05)
+## [7.8.5](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.4...v7.8.5) (2019-10-05)
 
 
 ### Bug Fixes
@@ -2517,7 +2564,7 @@ relative when priorities are ordinal
 
 
 
-### [7.8.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.3...v7.8.4) (2019-10-05)
+## [7.8.4](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.3...v7.8.4) (2019-10-05)
 
 
 ### Bug Fixes
@@ -2526,7 +2573,7 @@ relative when priorities are ordinal
 
 
 
-### [7.8.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.2...v7.8.3) (2019-10-05)
+## [7.8.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.2...v7.8.3) (2019-10-05)
 
 
 ### Bug Fixes
@@ -2535,7 +2582,7 @@ relative when priorities are ordinal
 
 
 
-### [7.8.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.1...v7.8.2) (2019-10-04)
+## [7.8.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.1...v7.8.2) (2019-10-04)
 
 
 ### Bug Fixes
@@ -2544,7 +2591,7 @@ relative when priorities are ordinal
 
 
 
-### [7.8.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.0...v7.8.1) (2019-10-04)
+## [7.8.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.8.0...v7.8.1) (2019-10-04)
 
 
 ### Bug Fixes
@@ -2597,7 +2644,7 @@ relative when priorities are ordinal
 
 
 
-### [7.4.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.4.1...v7.4.2) (2019-10-01)
+## [7.4.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.4.1...v7.4.2) (2019-10-01)
 
 
 ### Bug Fixes
@@ -2606,7 +2653,7 @@ relative when priorities are ordinal
 
 
 
-### [7.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.4.0...v7.4.1) (2019-10-01)
+## [7.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.4.0...v7.4.1) (2019-10-01)
 
 
 ### Bug Fixes
@@ -2624,7 +2671,7 @@ relative when priorities are ordinal
 
 
 
-### [7.3.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.3.1...v7.3.2) (2019-10-01)
+## [7.3.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.3.1...v7.3.2) (2019-10-01)
 
 
 ### Bug Fixes
@@ -2634,7 +2681,7 @@ relative when priorities are ordinal
 
 
 
-### [7.3.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.3.0...v7.3.1) (2019-09-30)
+## [7.3.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.3.0...v7.3.1) (2019-09-30)
 
 
 ### Bug Fixes
@@ -2657,7 +2704,7 @@ relative when priorities are ordinal
 
 
 
-### [7.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.2.1...v7.2.2) (2019-09-30)
+## [7.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.2.1...v7.2.2) (2019-09-30)
 
 
 ### Bug Fixes
@@ -2666,7 +2713,7 @@ relative when priorities are ordinal
 
 
 
-### [7.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.2.0...v7.2.1) (2019-09-28)
+## [7.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.2.0...v7.2.1) (2019-09-28)
 
 
 ### Bug Fixes
@@ -2691,7 +2738,7 @@ relative when priorities are ordinal
 
 
 
-### [7.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.1.1...v7.1.2) (2019-09-26)
+## [7.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.1.1...v7.1.2) (2019-09-26)
 
 
 ### Bug Fixes
@@ -2700,7 +2747,7 @@ relative when priorities are ordinal
 
 
 
-### [7.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.1.0...v7.1.1) (2019-09-26)
+## [7.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v7.1.0...v7.1.1) (2019-09-26)
 
 
 ### Bug Fixes
@@ -2767,7 +2814,7 @@ relative when priorities are ordinal
 
 
 
-### [6.11.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v6.11.0...v6.11.1) (2019-09-17)
+## [6.11.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v6.11.0...v6.11.1) (2019-09-17)
 
 
 ### Bug Fixes
@@ -2916,7 +2963,7 @@ relative when priorities are ordinal
 
 
 
-### [6.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v6.2.0...v6.2.1) (2019-09-04)
+## [6.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v6.2.0...v6.2.1) (2019-09-04)
 
 
 ### Bug Fixes
@@ -3050,7 +3097,7 @@ relative when priorities are ordinal
 
 
 
-### [5.2.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.2.2...v5.2.3) (2019-08-22)
+## [5.2.3](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.2.2...v5.2.3) (2019-08-22)
 
 
 ### Bug Fixes
@@ -3059,11 +3106,11 @@ relative when priorities are ordinal
 
 
 
-### [5.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.2.1...v5.2.2) (2019-08-22)
+## [5.2.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.2.1...v5.2.2) (2019-08-22)
 
 
 
-### [5.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.2.0...v5.2.1) (2019-08-21)
+## [5.2.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.2.0...v5.2.1) (2019-08-21)
 
 
 ### Bug Fixes
@@ -3103,7 +3150,7 @@ relative when priorities are ordinal
 
 
 
-### [5.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.0.1...v5.0.2) (2019-08-13)
+## [5.0.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.0.1...v5.0.2) (2019-08-13)
 
 
 ### Bug Fixes
@@ -3112,7 +3159,7 @@ relative when priorities are ordinal
 
 
 
-### [5.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.0.0...v5.0.1) (2019-08-12)
+## [5.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v5.0.0...v5.0.1) (2019-08-12)
 
 
 
@@ -3173,7 +3220,7 @@ them together now)
 
 
 
-### [4.13.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.13.0...v4.13.1) (2019-08-07)
+## [4.13.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.13.0...v4.13.1) (2019-08-07)
 
 
 ### Bug Fixes
@@ -3193,7 +3240,7 @@ them together now)
 
 
 
-### [4.12.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.12.0...v4.12.1) (2019-08-06)
+## [4.12.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.12.0...v4.12.1) (2019-08-06)
 
 
 ### Bug Fixes
@@ -3357,7 +3404,7 @@ them together now)
 
 
 
-### [4.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.1.1...v4.1.2) (2019-07-17)
+## [4.1.2](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.1.1...v4.1.2) (2019-07-17)
 
 
 ### Bug Fixes
@@ -3366,7 +3413,7 @@ them together now)
 
 
 
-### [4.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.1.0...v4.1.1) (2019-07-17)
+## [4.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.1.0...v4.1.1) (2019-07-17)
 
 
 ### Bug Fixes
@@ -3387,7 +3434,7 @@ them together now)
 
 
 
-### [4.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.0.0...v4.0.1) (2019-07-16)
+## [4.0.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v4.0.0...v4.0.1) (2019-07-16)
 
 
 ### Bug Fixes
@@ -3437,7 +3484,7 @@ them together now)
 
 
 
-### [2.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v2.1.0...v2.1.1) (2019-07-10)
+## [2.1.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v2.1.0...v2.1.1) (2019-07-10)
 
 
 ### Bug Fixes
@@ -3484,7 +3531,7 @@ them together now)
 
 
 
-### [1.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v1.4.0...v1.4.1) (2019-07-04)
+## [1.4.1](https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/v1.4.0...v1.4.1) (2019-07-04)
 
 
 
diff --git a/config/settings.yml b/config/settings.yml
index c1fc4edbd..fa8a65f81 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -63,6 +63,9 @@ health-check-matching-cluster-config-timeout: "_env:HEALTHCHECK_MATCHING_CLUSTER
 synchronise-ldap-users-within: "_env:SYNCHRONISE_LDAP_WITHIN:1209600"
 synchronise-ldap-users-interval: "_env:SYNCHRONISE_LDAP_INTERVAL:3600"
 
+study-features-recache-relevance-within: 172800
+study-features-recache-relevance-interval: 293
+
 log-settings:
   detailed:      "_env:DETAILED_LOGGING:false"
   all:           "_env:LOG_ALL:false"
diff --git a/hlint.sh b/hlint.sh
index c6772fda7..5f30751cc 100755
--- a/hlint.sh
+++ b/hlint.sh
@@ -4,4 +4,15 @@ set -e
 
 [ "${FLOCKER}" != "$0" ] && exec env FLOCKER="$0" flock -en .stack-work.lock "$0" "$@" || :
 
+move-back() {
+    mv -v .stack-work .stack-work-test
+    [[ -d .stack-work-build ]] && mv -v .stack-work-build .stack-work
+}
+
+if [[ -d .stack-work-test ]]; then
+    [[ -d .stack-work ]] && mv -v .stack-work .stack-work-build
+    mv -v .stack-work-test .stack-work
+    trap move-back EXIT
+fi
+
 exec -- stack build --test --fast --flag uniworx:dev --flag uniworx:library-only uniworx:test:hlint
diff --git a/models/study-features.model b/models/study-features.model
index 71b72ad0f..1c0b2e111 100644
--- a/models/study-features.model
+++ b/models/study-features.model
@@ -8,7 +8,7 @@ StudyFeatures  -- multiple entries possible for students pursuing several degree
     firstObserved UTCTime Maybe
     lastObserved  UTCTime default=now() -- last update from LDAP
     valid         Bool default=true
-    relevanceCached Bool default=false
+    relevanceCached UUID Maybe
     UniqueStudyFeatures user degree field type semester
     deriving Eq Show
     -- UniqueUserSubject ubuser degree field -- There exists a counterexample
diff --git a/models/workflows.model b/models/workflows.model
index 590b79744..7561e9c65 100644
--- a/models/workflows.model
+++ b/models/workflows.model
@@ -1,5 +1,10 @@
-WorkflowDefinition
+SharedWorkflowGraph
+    hash        WorkflowGraphReference
     graph       (WorkflowGraph FileReference SqlBackendKey) -- UserId
+    Primary     hash
+
+WorkflowDefinition
+    graph       SharedWorkflowGraphId
     scope       WorkflowScope'
     name        WorkflowDefinitionName 
     instanceCategory WorkflowInstanceCategory Maybe
@@ -21,7 +26,7 @@ WorkflowDefinitionInstanceDescription
 
 WorkflowInstance
     definition  WorkflowDefinitionId Maybe
-    graph       (WorkflowGraph FileReference SqlBackendKey)  -- UserId
+    graph       SharedWorkflowGraphId
     scope       (WorkflowScope TermIdentifier SchoolShorthand SqlBackendKey)  -- TermId, SchoolId, CourseId
     name        WorkflowInstanceName
     category    WorkflowInstanceCategory Maybe
@@ -37,5 +42,5 @@ WorkflowInstanceDescription
 WorkflowWorkflow
     instance    WorkflowInstanceId Maybe
     scope       (WorkflowScope TermIdentifier SchoolShorthand SqlBackendKey)  -- TermId, SchoolId, CourseId
-    graph       (WorkflowGraph FileReference SqlBackendKey)  -- UserId
+    graph       SharedWorkflowGraphId
     state       (WorkflowState FileReference SqlBackendKey)  -- UserId
diff --git a/package-lock.json b/package-lock.json
index 0d1379a39..e16333912 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "uni2work",
-  "version": "23.6.0",
+  "version": "24.1.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -5115,6 +5115,16 @@
         "supports-color": "^5.3.0"
       }
     },
+    "changelog-parser": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npmjs.org/changelog-parser/-/changelog-parser-2.8.0.tgz",
+      "integrity": "sha512-ZtSwN0hY7t+WpvaXqqXz98RHCNhWX9HsvCRAv1aBLlqJ7BpKtqdM6Nu6JOiUhRAWR7Gov0aN0fUnmflTz0WgZg==",
+      "dev": true,
+      "requires": {
+        "line-reader": "^0.2.4",
+        "remove-markdown": "^0.2.2"
+      }
+    },
     "chardet": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
@@ -5648,22 +5658,45 @@
       "dev": true
     },
     "conventional-changelog": {
-      "version": "3.1.23",
-      "resolved": "https://registry.npmjs.org/conventional-changelog/-/conventional-changelog-3.1.23.tgz",
-      "integrity": "sha512-sScUu2NHusjRC1dPc5p8/b3kT78OYr95/Bx7Vl8CPB8tF2mG1xei5iylDTRjONV5hTlzt+Cn/tBWrKdd299b7A==",
+      "version": "3.1.24",
+      "resolved": "https://registry.npmjs.org/conventional-changelog/-/conventional-changelog-3.1.24.tgz",
+      "integrity": "sha512-ed6k8PO00UVvhExYohroVPXcOJ/K1N0/drJHx/faTH37OIZthlecuLIRX/T6uOp682CAoVoFpu+sSEaeuH6Asg==",
       "dev": true,
       "requires": {
-        "conventional-changelog-angular": "^5.0.11",
-        "conventional-changelog-atom": "^2.0.7",
-        "conventional-changelog-codemirror": "^2.0.7",
-        "conventional-changelog-conventionalcommits": "^4.4.0",
-        "conventional-changelog-core": "^4.2.0",
-        "conventional-changelog-ember": "^2.0.8",
-        "conventional-changelog-eslint": "^3.0.8",
-        "conventional-changelog-express": "^2.0.5",
-        "conventional-changelog-jquery": "^3.0.10",
-        "conventional-changelog-jshint": "^2.0.8",
+        "conventional-changelog-angular": "^5.0.12",
+        "conventional-changelog-atom": "^2.0.8",
+        "conventional-changelog-codemirror": "^2.0.8",
+        "conventional-changelog-conventionalcommits": "^4.5.0",
+        "conventional-changelog-core": "^4.2.1",
+        "conventional-changelog-ember": "^2.0.9",
+        "conventional-changelog-eslint": "^3.0.9",
+        "conventional-changelog-express": "^2.0.6",
+        "conventional-changelog-jquery": "^3.0.11",
+        "conventional-changelog-jshint": "^2.0.9",
         "conventional-changelog-preset-loader": "^2.3.4"
+      },
+      "dependencies": {
+        "conventional-changelog-angular": {
+          "version": "5.0.12",
+          "resolved": "https://registry.npmjs.org/conventional-changelog-angular/-/conventional-changelog-angular-5.0.12.tgz",
+          "integrity": "sha512-5GLsbnkR/7A89RyHLvvoExbiGbd9xKdKqDTrArnPbOqBqG/2wIosu0fHwpeIRI8Tl94MhVNBXcLJZl92ZQ5USw==",
+          "dev": true,
+          "requires": {
+            "compare-func": "^2.0.0",
+            "q": "^1.5.1"
+          }
+        },
+        "conventional-changelog-conventionalcommits": {
+          "version": "4.5.0",
+          "resolved": "https://registry.npmjs.org/conventional-changelog-conventionalcommits/-/conventional-changelog-conventionalcommits-4.5.0.tgz",
+          "integrity": "sha512-buge9xDvjjOxJlyxUnar/+6i/aVEVGA7EEh4OafBCXPlLUQPGbRUBhBUveWRxzvR8TEjhKEP4BdepnpG2FSZXw==",
+          "dev": true,
+          "requires": {
+            "compare-func": "^2.0.0",
+            "lodash": "^4.17.15",
+            "q": "^1.5.1"
+          }
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     "conventional-changelog-angular": {
@@ -5677,18 +5710,18 @@
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-      "resolved": "https://registry.npmjs.org/conventional-changelog-atom/-/conventional-changelog-atom-2.0.7.tgz",
-      "integrity": "sha512-7dOREZwzB+tCEMjRTDfen0OHwd7vPUdmU0llTy1eloZgtOP4iSLVzYIQqfmdRZEty+3w5Jz+AbhfTJKoKw1JeQ==",
+      "version": "2.0.8",
+      "resolved": "https://registry.npmjs.org/conventional-changelog-atom/-/conventional-changelog-atom-2.0.8.tgz",
+      "integrity": "sha512-xo6v46icsFTK3bb7dY/8m2qvc8sZemRgdqLb/bjpBsH2UyOS8rKNTgcb5025Hri6IpANPApbXMg15QLb1LJpBw==",
       "dev": true,
       "requires": {
         "q": "^1.5.1"
       }
     },
     "conventional-changelog-codemirror": {
-      "version": "2.0.7",
-      "resolved": "https://registry.npmjs.org/conventional-changelog-codemirror/-/conventional-changelog-codemirror-2.0.7.tgz",
-      "integrity": "sha512-Oralk1kiagn3Gb5cR5BffenWjVu59t/viE6UMD/mQa1hISMPkMYhJIqX+CMeA1zXgVBO+YHQhhokEj99GP5xcg==",
+      "version": "2.0.8",
+      "resolved": "https://registry.npmjs.org/conventional-changelog-codemirror/-/conventional-changelog-codemirror-2.0.8.tgz",
+      "integrity": "sha512-z5DAsn3uj1Vfp7po3gpt2Boc+Bdwmw2++ZHa5Ak9k0UKsYAO5mH1UBTN0qSCuJZREIhX6WU4E1p3IW2oRCNzQw==",
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@@ -5712,175 +5745,118 @@
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-      "resolved": "https://registry.npmjs.org/conventional-changelog-core/-/conventional-changelog-core-4.2.0.tgz",
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+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/conventional-changelog-core/-/conventional-changelog-core-4.2.2.tgz",
+      "integrity": "sha512-7pDpRUiobQDNkwHyJG7k9f6maPo9tfPzkSWbRq97GGiZqisElhnvUZSvyQH20ogfOjntB5aadvv6NNcKL1sReg==",
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       "requires": {
         "add-stream": "^1.0.0",
-        "conventional-changelog-writer": "^4.0.17",
-        "conventional-commits-parser": "^3.1.0",
+        "conventional-changelog-writer": "^4.0.18",
+        "conventional-commits-parser": "^3.2.0",
         "dateformat": "^3.0.0",
         "get-pkg-repo": "^1.0.0",
-        "git-raw-commits": "2.0.0",
+        "git-raw-commits": "^2.0.8",
         "git-remote-origin-url": "^2.0.0",
-        "git-semver-tags": "^4.1.0",
+        "git-semver-tags": "^4.1.1",
         "lodash": "^4.17.15",
-        "normalize-package-data": "^2.3.5",
+        "normalize-package-data": "^3.0.0",
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         "read-pkg": "^3.0.0",
         "read-pkg-up": "^3.0.0",
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-        "through2": "^3.0.0"
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+            "decamelize-keys": "^1.1.0",
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+            "trim-newlines": "^3.0.0",
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+            "yargs-parser": "^20.2.3"
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@@ -5895,6 +5871,18 @@
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       "dev": true
     },
     "uglify-js": {
-      "version": "3.9.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.9.0.tgz",
-      "integrity": "sha512-j5wNQBWaql8gr06dOUrfaohHlscboQZ9B8sNsoK5o4sBjm7Ht9dxSbrMXyktQpA16Acaij8AcoozteaPYZON0g==",
+      "version": "3.12.7",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.12.7.tgz",
+      "integrity": "sha512-SIZhkoh+U/wjW+BHGhVwE9nt8tWJspncloBcFapkpGRwNPqcH8pzX36BXe3TPBjzHWPMUZotpCigak/udWNr1Q==",
       "dev": true,
-      "optional": true,
-      "requires": {
-        "commander": "~2.20.3"
-      },
-      "dependencies": {
-        "commander": {
-          "version": "2.20.3",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
-          "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
-          "dev": true,
-          "optional": true
-        }
-      }
+      "optional": true
     },
     "underscore": {
       "version": "1.11.0",
@@ -21411,6 +21605,12 @@
       "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk=",
       "dev": true
     },
+    "yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true
+    },
     "yup": {
       "version": "0.27.0",
       "resolved": "https://registry.npmjs.org/yup/-/yup-0.27.0.tgz",
diff --git a/package.json b/package.json
index fbda3c014..403fe9fd8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "uni2work",
-  "version": "23.6.0",
+  "version": "24.1.2",
   "description": "",
   "keywords": [],
   "author": "",
@@ -26,7 +26,8 @@
     "i18n:test": "./missing-translations.sh",
     "prerelease": "./is-clean.sh && npm run test",
     "release": "standard-version -a",
-    "postrelease": "git push --follow-tags origin master"
+    "postrelease": "git push --follow-tags origin master",
+    "parse-changelog": "changelog-parser ./CHANGELOG.md > changelog.json"
   },
   "husky": {
     "hooks": {
@@ -42,7 +43,8 @@
   },
   "standard-version": {
     "scripts": {
-      "postbump": "./sync-versions.hs && git add -- package.yaml"
+      "postbump": "./sync-versions.hs && git add -- package.yaml",
+      "postchangelog": "sed 's/^### \\[/## [/g' -i CHANGELOG.md"
     },
     "commitUrlFormat": "https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/commit/{{hash}}",
     "compareUrlFormat": "https://gitlab2.rz.ifi.lmu.de/uni2work/uni2work/compare/{{previousTag}}...{{currentTag}}",
@@ -70,6 +72,7 @@
     "babel-plugin-transform-decorators-legacy": "^1.3.5",
     "babel-preset-es2015": "^6.24.1",
     "cbt_tunnels": "^1.2.2",
+    "changelog-parser": "^2.8.0",
     "clean-webpack-plugin": "^3.0.0",
     "copy-webpack-plugin": "^6.0.3",
     "css-loader": "^2.1.1",
@@ -104,13 +107,13 @@
     "sass": "^1.26.10",
     "sass-loader": "^7.3.1",
     "semver": "^6.3.0",
-    "standard-version": "^9.0.0",
+    "standard-version": "^9.1.0",
     "style-loader": "^0.23.1",
     "terser-webpack-plugin": "^2.3.8",
     "tmp": "^0.1.0",
     "typeface-roboto": "0.0.75",
-    "typeface-source-sans-pro": "0.0.75",
     "typeface-source-code-pro": "^1.1.3",
+    "typeface-source-sans-pro": "0.0.75",
     "webpack": "^4.44.1",
     "webpack-cli": "^3.3.12",
     "webpack-manifest-plugin": "^2.2.0",
diff --git a/package.yaml b/package.yaml
index ee9cd9830..ca2df3648 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name:    uniworx
-version: 23.6.0
+version: 24.1.2
 
 dependencies:
   - base
diff --git a/src/Application.hs b/src/Application.hs
index c7619cbed..6dc58f427 100644
--- a/src/Application.hs
+++ b/src/Application.hs
@@ -89,6 +89,7 @@ import Control.Concurrent.STM.Delay
 import Control.Monad.Trans.Cont (runContT, callCC)
 
 import qualified Data.Set as Set
+import qualified Data.Map as Map
 
 import Handler.Utils.Routes (classifyHandler)
 
@@ -148,6 +149,7 @@ mkYesodDispatch "UniWorX" resourcesUniWorX
 makeFoundation :: (MonadResource m, MonadUnliftIO m, MonadCatch m) => AppSettings -> m UniWorX
 makeFoundation appSettings''@AppSettings{..} = do
     registerGHCMetrics
+    registerHealthCheckInterval appHealthCheckInterval
 
     -- Some basic initializations: HTTP connection manager, logger, and static
     -- subsite.
@@ -553,41 +555,46 @@ appMain = runResourceT $ do
         Just wInterval
           | maybe True (== myProcessID) watchdogProcess
             -> let notifyWatchdog :: forall a m'. ( MonadLogger m', MonadIO m') => m' a
-                   notifyWatchdog = go Nothing
-                     where
-                       go :: Maybe (Set (UTCTime, HealthReport)) -> m' a
-                       go pResults = do
-                         let delay = floor $ wInterval % 4
-                         d <- liftIO $ newDelay delay
+                   notifyWatchdog = forever' Nothing $ \pResults -> do
+                     let delay = floor $ wInterval % 4
+                     d <- liftIO $ newDelay delay
+ 
+                     $logDebugS "Notify" $ "Waiting up to " <> tshow delay <> "µs..."
+                     mResults <- atomically $ asum
+                       [ pResults <$ waitDelay d
+                       , do
+                           results <- readTVar $ foundation ^. _appHealthReport
+                           guardOn (pResults /= Just results) $ Just results
+                       ]
 
-                         $logDebugS "Notify" $ "Waiting up to " <> tshow delay <> "µs..."
-                         mResults <- atomically $ asum
-                           [ pResults <$ waitDelay d
-                           , do
-                               results <- readTVar $ foundation ^. _appHealthReport
-                               guardOn (pResults /= Just results) $ Just results
-                           ]
+                     $logDebugS "Notify" "Checking for status/watchdog..."
+                     mResults <$ do
+                       void . runMaybeT $ do
+                         results <- hoistMaybe mResults
 
-                         $logDebugS "Notify" "Checking for status/watchdog..."
-                         (*> go mResults) . void . runMaybeT $ do
-                           results <- hoistMaybe mResults
+                         let latestResults = Map.fromListWith (\_ x -> x) $ Set.toAscList results
+                         Min status <- hoistMaybe $ ofoldMap1 (Min . healthReportStatus) <$> fromNullable latestResults
+                         $logInfoS "NotifyStatus" $ toPathPiece status
+                         liftIO . void . Systemd.notifyStatus . unpack $ toPathPiece status
 
-                           Min status <- hoistMaybe $ ofoldMap1 (Min . healthReportStatus . view _2) <$> fromNullable results
-                           $logInfoS "NotifyStatus" $ toPathPiece status
-                           liftIO . void . Systemd.notifyStatus . unpack $ toPathPiece status
+                       now <- liftIO getCurrentTime
+                       let missing = flip ifoldMap (foundation ^. _appHealthCheckInterval) $ \hc mInterval -> fromMaybe mempty $ do
+                             interval <- mInterval
+                             let lastSuccess = maybeMonoid mResults
+                                   & Set.filter (\(_, rep) -> classifyHealthReport rep == hc)
+                                   & Set.filter (\(_, rep) -> healthReportStatus rep >= HealthSuccess)
+                                   & Set.mapMonotonic (view _1)
+                                   & Set.lookupMax
 
-                           now <- liftIO getCurrentTime
-                           iforM_ (foundation ^. _appHealthCheckInterval) . curry $ \case
-                             (_, Nothing) -> return ()
-                             (hc, Just interval) -> do
-                               lastSuccess <- hoistMaybe $ results
-                                 & Set.filter (\(_, rep) -> classifyHealthReport rep == hc)
-                                 & Set.filter (\(_, rep) -> healthReportStatus rep >= HealthSuccess)
-                                 & Set.mapMonotonic (view _1)
-                                 & Set.lookupMax
-                               guard $ lastSuccess > addUTCTime (negate interval) now
-                           $logInfoS "NotifyWatchdog" "Notify"
-                           liftIO $ void Systemd.notifyWatchdog
+                                 successIsCurrent = lastSuccess > Just (negate interval `addUTCTime` now)
+
+                             return . guardMonoid (not successIsCurrent) $ Set.singleton hc
+
+                       if | Set.null missing -> do
+                              $logInfoS "NotifyWatchdog" "Notify"
+                              liftIO $ void Systemd.notifyWatchdog
+                          | otherwise ->
+                              $logWarnS "NotifyWatchdog" $ "No notify; missing \n\t   " <> tshow (toList missing) <> "\n\tin " <> tshow (toList <$> mResults)
                 in do
                      $logDebugS "Notify" "Spawning notify thread..."
                      void $ allocateLinkedAsync notifyWatchdog
diff --git a/src/Foundation/Authorization.hs b/src/Foundation/Authorization.hs
index 6a1e3d3d1..a6420a109 100644
--- a/src/Foundation/Authorization.hs
+++ b/src/Foundation/Authorization.hs
@@ -1254,7 +1254,7 @@ tagAccessPredicate AuthRegisterGroup = APDB $ \_ _ mAuthId route _ -> case route
         return Authorized
   r -> $unsupportedAuthPredicate AuthRegisterGroup r
 tagAccessPredicate AuthEmpty = APDB $ \_ _ mAuthId route _
-  -> let workflowInstanceWorkflowsEmpty rScope win = selectLanguageI18n <=< $memcacheAuthHere' (Right diffDay) (mAuthId, route) . maybeT (unauthorizedI18n MsgUnauthorizedWorkflowWorkflowsNotEmpty) $ do
+  -> let workflowInstanceWorkflowsEmpty rScope win = selectLanguageI18n <=< $cachedHereBinary (mAuthId, route) . maybeT (unauthorizedI18n MsgUnauthorizedWorkflowWorkflowsNotEmpty) $ do
            scope <- fromRouteWorkflowScope rScope
            let dbScope = scope ^. _DBWorkflowScope
                getWorkflowWorkflows = E.selectSource . E.from $ \(workflowWorkflow `E.InnerJoin` workflowInstance) -> do
@@ -1416,9 +1416,8 @@ tagAccessPredicate AuthWorkflow = APDB $ \evalCtx eval' mAuthId route isWrite ->
       wInitiate win rScope = selectLanguageI18n <=< $memcacheAuthHere' (Right diffDay) (evalCtx, route, mAuthId) . maybeT (unauthorizedI18n MsgUnauthorizedWorkflowInitiate) $ do -- @isWrite@ not included since it should make no difference regarding initiation (in the end that will always be a write)
         scope <- MaybeT . $cachedHereBinary rScope . runMaybeT $ fromRouteWorkflowScope rScope
         Entity _ WorkflowInstance{..} <- $cachedHereBinary (win, scope) . MaybeT . getBy . UniqueWorkflowInstance win $ scope ^. _DBWorkflowScope
+        wiGraph <- lift $ getSharedIdWorkflowGraph workflowInstanceGraph
         let
-          wiGraph :: IdWorkflowGraph
-          wiGraph = _DBWorkflowGraph # workflowInstanceGraph
           edges = do
             WGN{..} <- wiGraph ^.. _wgNodes . folded
             WorkflowGraphEdgeInitial{..} <- wgnEdges ^.. folded
@@ -1434,11 +1433,9 @@ tagAccessPredicate AuthWorkflow = APDB $ \evalCtx eval' mAuthId route isWrite ->
             (wwId, edges) <- memcacheAuth' (Right diffDay) (AuthCacheWorkflowWorkflowEdgeActors cID) $ do
               wwId <- catchIfMaybeT (const True :: CryptoIDError -> Bool) $ decrypt cID
               WorkflowWorkflow{..} <- MaybeT . $cachedHereBinary wwId $ get wwId
+              wwGraph <- lift $ getSharedIdWorkflowGraph workflowWorkflowGraph
 
               let
-                wwGraph :: IdWorkflowGraph
-                wwGraph = _DBWorkflowGraph # workflowWorkflowGraph
-
                 wwNode = wpTo $ last workflowWorkflowState
 
               return . (wwId, ) . (Set.fromList :: _ -> Set (WorkflowRole UserId)) . foldMap toNullable $ do
@@ -1455,11 +1452,9 @@ tagAccessPredicate AuthWorkflow = APDB $ \evalCtx eval' mAuthId route isWrite ->
             (wwId, roles) <- memcacheAuth' (Right diffDay) (AuthCacheWorkflowWorkflowViewers cID) $ do
               wwId <- catchIfMaybeT (const True :: CryptoIDError -> Bool) $ decrypt cID
               WorkflowWorkflow{..} <- MaybeT . $cachedHereBinary wwId $ get wwId
+              wwGraph <- lift $ getSharedIdWorkflowGraph workflowWorkflowGraph
 
               let
-                wwGraph :: IdWorkflowGraph
-                wwGraph = _DBWorkflowGraph # workflowWorkflowGraph
-
                 nodeViewers = do
                   WorkflowAction{..} <- otoList workflowWorkflowState
                   (node, WGN{..}) <- itoListOf (_wgNodes . ifolded) wwGraph
@@ -1483,9 +1478,7 @@ tagAccessPredicate AuthWorkflow = APDB $ \evalCtx eval' mAuthId route isWrite ->
         wwId <- catchIfMaybeT (const True :: CryptoIDError -> Bool) $ decrypt wwCID
         WorkflowWorkflow{..} <- MaybeT . $cachedHereBinary wwId $ get wwId
         stIx <- catchIfMaybeT (const True :: CryptoIDError -> Bool) $ decryptWorkflowStateIndex wwId stCID
-        let
-          wwGraph :: IdWorkflowGraph
-          wwGraph = _DBWorkflowGraph # workflowWorkflowGraph
+        wwGraph <- lift $ getSharedIdWorkflowGraph workflowWorkflowGraph
         act <- workflowStateIndex stIx $ _DBWorkflowState # workflowWorkflowState 
         let
           cState = wpTo act
@@ -1764,8 +1757,8 @@ mayViewWorkflowAction' eval mAuthId wwId WorkflowAction{..} = hoist (withReaderT
   WorkflowWorkflow{..} <- MaybeT . lift $ get wwId
   rScope <- hoist lift . toRouteWorkflowScope $ _DBWorkflowScope # workflowWorkflowScope
   cID <- hoist lift . catchMaybeT (Proxy @CryptoIDError) . lift $ encrypt wwId
-  let WorkflowGraph{..} = _DBWorkflowGraph # workflowWorkflowGraph
-      canonRoute = _WorkflowScopeRoute # (rScope, WorkflowWorkflowR cID WWWorkflowR)
+  WorkflowGraph{..} <- lift . lift $ getSharedIdWorkflowGraph workflowWorkflowGraph
+  let canonRoute = _WorkflowScopeRoute # (rScope, WorkflowWorkflowR cID WWWorkflowR)
       evalWorkflowRole'' role = lift $ is _Authorized <$> evalWorkflowRoleFor' eval mAuthId (Just wwId) role canonRoute False
   WorkflowNodeView{..} <- hoistMaybe $ Map.lookup wpTo wgNodes >>= wgnViewers
   guardM $ orM
diff --git a/src/Foundation/Yesod/Auth.hs b/src/Foundation/Yesod/Auth.hs
index f1c1c3a40..f114b23e4 100644
--- a/src/Foundation/Yesod/Auth.hs
+++ b/src/Foundation/Yesod/Auth.hs
@@ -352,7 +352,7 @@ upsertCampusUser upsertMode ldapData = do
                     , studyFeaturesFirstObserved = Just now
                     , studyFeaturesLastObserved = now
                     , studyFeaturesValid = True
-                    , studyFeaturesRelevanceCached = False
+                    , studyFeaturesRelevanceCached = Nothing
                     }
               (sf :) <$> assimilateSubTerms subterms unusedFeats
         Nothing
diff --git a/src/Foundation/Yesod/Middleware.hs b/src/Foundation/Yesod/Middleware.hs
index 473f50de3..650236778 100644
--- a/src/Foundation/Yesod/Middleware.hs
+++ b/src/Foundation/Yesod/Middleware.hs
@@ -143,6 +143,7 @@ yesodMiddleware = cacheControlMiddleware . storeBearerMiddleware . csrfMiddlewar
         MetricsR -> mzero
         HealthR -> mzero
         InstanceR -> mzero
+        AdminCrontabR -> mzero
         _other -> return ()
   
       reqHost <- MaybeT $ W.requestHeaderHost <$> waiRequest
@@ -313,7 +314,8 @@ routeNormalizers = map (hoist (hoist liftHandler . withReaderT projectBackend) .
       (_, WorkflowWorkflowR cID (WWFilesR wpl _)) <- hoistMaybe $ route ^? _WorkflowScopeRoute
       wwId <- decrypt cID
       WorkflowWorkflow{..} <- MaybeT . $cachedHereBinary wwId . lift $ get wwId
-      [wpl'] <- return . filter (== wpl) . sortOn (CI.original . unWorkflowPayloadLabel) . foldMap Map.keys $ wgnPayloadView <$> wgNodes workflowWorkflowGraph
+      wwGraph <- lift . lift $ getSharedDBWorkflowGraph workflowWorkflowGraph
+      [wpl'] <- return . filter (== wpl) . sortOn (CI.original . unWorkflowPayloadLabel) . foldMap Map.keys $ wgnPayloadView <$> wgNodes wwGraph
       (caseChanged `on` unWorkflowPayloadLabel) wpl wpl'
       return $ route
         & typesUsing @RouteChildren @WorkflowPayloadLabel . filtered (== wpl) .~ wpl'
diff --git a/src/Handler/Admin/Crontab.hs b/src/Handler/Admin/Crontab.hs
index daff2070f..18225b5cb 100644
--- a/src/Handler/Admin/Crontab.hs
+++ b/src/Handler/Admin/Crontab.hs
@@ -17,6 +17,8 @@ import qualified Data.Text.Lazy.Builder as Text.Builder
 import qualified Data.HashSet as HashSet
 import qualified Data.HashMap.Strict as HashMap
 
+import qualified Data.UUID as UUID
+
 
 deriveJSON defaultOptions
   { constructorTagModifier = camelToPathPiece' 1
@@ -32,9 +34,12 @@ getAdminCrontabR = do
 
   let mCrontab = mCrontab' <&> _2 %~ filter (hasn't $ _3 . _MatchNone)
 
+  instanceId <- getsYesod appInstanceID
+
   selectRep $ do
     provideRep $ do
       crontabBearer <- runMaybeT . hoist runDB $ do
+        guardM $ hasGlobalGetParam GetGenerateToken
         uid <- MaybeT maybeAuthId
         guardM . lift . existsBy $ UniqueUserGroupMember UserGroupCrontab uid
 
@@ -49,6 +54,10 @@ getAdminCrontabR = do
             <section>
               <pre .token>
                 #{toPathPiece t}
+          <section>
+            <dl .deflist>
+              <dt .deflist__dt>_{MsgInstanceId}
+              <dd .deflist__dd .uuid>#{UUID.toText instanceId}
           <section>
             $maybe (genTime, crontab) <- mCrontab
               <p>
diff --git a/src/Handler/ExamOffice/Exams.hs b/src/Handler/ExamOffice/Exams.hs
index f4f957c4c..7b98ed007 100644
--- a/src/Handler/ExamOffice/Exams.hs
+++ b/src/Handler/ExamOffice/Exams.hs
@@ -15,6 +15,8 @@ import qualified Database.Esqueleto.Utils as E
 
 import qualified Colonnade
 
+import qualified Data.Conduit.Combinators as C
+
 
 type ExamsTableExpr = (               E.SqlExpr (Maybe (Entity Exam))
                         `E.InnerJoin` E.SqlExpr (Maybe (Entity Course))
@@ -38,54 +40,6 @@ querySchool = to $ $(E.sqlIJproj 3 3) . $(E.sqlFOJproj 2 1)
 queryExternalExam :: Getter ExamsTableExpr (E.SqlExpr (Maybe (Entity ExternalExam)))
 queryExternalExam = to $(E.sqlFOJproj 2 2)
 
-querySynchronised :: E.SqlExpr (E.Value UserId) -> Getter ExamsTableExpr (E.SqlExpr (E.Value Word64))
-querySynchronised office = to . runReader $ do
-  exam' <- view queryExam
-  externalExam' <- view queryExternalExam
-  let
-    examSynchronised examId = E.subSelectCount . E.from $ \examResult -> do
-      E.where_ $ examResult E.^. ExamResultExam E.==. examId
-      E.where_ $ Exam.examOfficeExamResultAuth office examResult
-      E.where_ $ Exam.resultIsSynced office examResult
-    externalExamSynchronised externalExamId = E.subSelectCount . E.from $ \externalExamResult -> do
-      E.where_ $ externalExamResult E.^. ExternalExamResultExam E.==. externalExamId
-      E.where_ $ ExternalExam.examOfficeExternalExamResultAuth office externalExamResult
-      E.where_ $ ExternalExam.resultIsSynced office externalExamResult
-  return $ E.maybe (E.val 0) examSynchronised (exam' E.?. ExamId) E.+. E.maybe (E.val 0) externalExamSynchronised (externalExam' E.?. ExternalExamId)
-
-queryResults :: E.SqlExpr (E.Value UserId) -> Getter ExamsTableExpr (E.SqlExpr (E.Value Word64))
-queryResults office = to . runReader $ do
-  exam' <- view queryExam
-  externalExam' <- view queryExternalExam
-  let
-    results examId = E.subSelectCount . E.from $ \examResult -> do
-      E.where_ $ examResult E.^. ExamResultExam E.==. examId
-      E.where_ $ Exam.examOfficeExamResultAuth office examResult
-    externalResults externalExamId = E.subSelectCount . E.from $ \externalExamResult -> do
-      E.where_ $ externalExamResult E.^. ExternalExamResultExam E.==. externalExamId
-      E.where_ $ ExternalExam.examOfficeExternalExamResultAuth office externalExamResult
-  return $ E.maybe (E.val 0) results (exam' E.?. ExamId) E.+. E.maybe (E.val 0) externalResults (externalExam' E.?. ExternalExamId)
-
-queryIsSynced :: UTCTime -> E.SqlExpr (E.Value UserId) -> Getter ExamsTableExpr (E.SqlExpr (E.Value Bool))
-queryIsSynced now office = to . runReader $ do
-  exam' <- view queryExam
-  externalExam' <- view queryExternalExam
-  school' <- view querySchool
-  let
-    examSynchronised examId = E.not_ . E.exists . E.from $ \examResult -> do
-      E.where_ $ examResult E.^. ExamResultExam E.==. examId
-      E.where_ $ Exam.examOfficeExamResultAuth office examResult
-      E.where_ . E.not_ $ Exam.resultIsSynced office examResult
-    externalExamSynchronised externalExamId = E.not_ . E.exists . E.from $ \externalExamResult -> do
-      E.where_ $ externalExamResult E.^. ExternalExamResultExam E.==. externalExamId
-      E.where_ $ ExternalExam.examOfficeExternalExamResultAuth office externalExamResult
-      E.where_ . E.not_ $ ExternalExam.resultIsSynced office externalExamResult
-    open examClosed' examFinished'
-      = E.bool (E.maybe E.true (E.>. E.val now) $ E.min examClosed' examFinished')
-               (E.maybe E.true (E.>. E.val now) examClosed')
-               (E.maybe E.false (E.==. E.val ExamCloseSeparate) (school' E.?. SchoolExamCloseMode))
-  return $ E.maybe E.false examSynchronised (exam' E.?. ExamId) E.||. E.maybe2 E.false open (exam' E.?. ExamClosed) (exam' E.?. ExamFinished) E.||. E.maybe E.false externalExamSynchronised (externalExam' E.?. ExternalExamId)
-
 
 resultExam :: Traversal' ExamsTableData (Entity Exam)
 resultExam = _dbrOutput . _1 . _Right . _1
@@ -128,10 +82,6 @@ getEOExamsR = do
       externalExamLink ExternalExam{..}
         = SomeRoute $ EExamR externalExamTerm externalExamSchool externalExamCourseName externalExamExamName EEGradesR
 
-      querySynchronised' = querySynchronised $ E.val uid
-      queryResults' = queryResults $ E.val uid
-      queryIsSynced' = queryIsSynced now $ E.val uid
-
       examsDBTable = DBTable{..}
         where
           dbtSQLQuery = runReaderT $ do
@@ -140,19 +90,15 @@ getEOExamsR = do
             school <- view querySchool
             externalExam <- view queryExternalExam
 
-            synchronised <- view querySynchronised'
-            results <- view queryResults'
-
             lift $ do
               E.on   E.false
               E.on $ school E.?. SchoolId E.==. course E.?. CourseSchool
               E.on $ exam E.?. ExamCourse E.==. course E.?. CourseId
 
-              E.where_ $ results E.>. E.val 0
               E.where_ $ (E.not_ (E.isNothing $ exam E.?. ExamId) E.&&. E.not_ (E.isNothing $ course E.?. CourseId) E.&&.         E.isNothing  (externalExam E.?. ExternalExamId))
                    E.||. (        E.isNothing  (exam E.?. ExamId) E.&&.         E.isNothing  (course E.?. CourseId) E.&&. E.not_ (E.isNothing $ externalExam E.?. ExternalExamId))
 
-            return (exam, course, school, externalExam, synchronised, results)
+            return (exam, course, school, externalExam)
           dbtRowKey = views ($(multifocusG 2) queryExam queryExternalExam) (bimap (E.?. ExamId) (E.?. ExternalExamId))
 
           dbtProj :: DBRow _ -> DB ExamsTableData
@@ -162,11 +108,24 @@ getEOExamsR = do
             school <- view _3
             externalExam <- view _4
 
+            let
+              getExamResults = for_ exam $ \(Entity examId _) -> E.selectSource . E.from $ \examResult -> do
+                E.where_ $ examResult E.^. ExamResultExam E.==. E.val examId
+                E.where_ $ Exam.examOfficeExamResultAuth (E.val uid) examResult
+                return $ Exam.resultIsSynced (E.val uid) examResult
+              getExternalExamResults = for_ externalExam $ \(Entity externalExamId _) -> E.selectSource . E.from $ \externalExamResult -> do
+                E.where_ $ externalExamResult E.^. ExternalExamResultExam E.==. E.val externalExamId
+                E.where_ $ ExternalExam.examOfficeExternalExamResultAuth (E.val uid) externalExamResult
+                return $ ExternalExam.resultIsSynced (E.val uid) externalExamResult
+              getResults = getExamResults >> getExternalExamResults
+              foldResult (E.Value isSynced) = (Sum 1, guardMonoid isSynced $ Sum 1)
+            (Sum resultCount, Sum syncedCount) <- lift . runConduit $ getResults .| C.foldMap foldResult
+
             case (exam, course, school, externalExam) of
-              (Just exam', Just course', Just school', Nothing) ->
-                (Right (exam', course', school'),,) <$> view (_5 . _Value . _Integral) <*> view (_6 . _Value . _Integral)
-              (Nothing, Nothing, Nothing, Just externalExam') ->
-                (Left externalExam',,) <$> view (_5 . _Value . _Integral) <*> view (_6 . _Value . _Integral)
+              (Just exam', Just course', Just school', Nothing) -> return
+                (Right (exam', course', school'), syncedCount, resultCount)
+              (Nothing, Nothing, Nothing, Just externalExam') -> return
+                (Left externalExam', syncedCount, resultCount)
               _other -> return $ error "Got exam & externalExam in same result"
 
 
@@ -216,8 +175,10 @@ getEOExamsR = do
             , emptyOpticColonnade (resultCourse . _entityVal . _courseTerm <> resultExternalExam . _entityVal . _externalExamTerm) colTermShort
             ]
           dbtSorting = mconcat
-            [ singletonMap "synced" . SortColumn $ (E./.) <$> view querySynchronised' <*> view queryResults'
-            , singletonMap "is-synced" . SortColumn $ view queryIsSynced'
+            [ singletonMap "synced" $
+                SortProjected . comparing $ ((/) `on` toRational) <$> view resultSynchronised <*> view resultResults
+            , singletonMap "is-synced" $
+                SortProjected . comparing $ (>=) <$> view resultSynchronised <*> view resultResults
             , sortExamName (to $ E.unsafeCoalesce . sequence [views queryExam (E.?. ExamName), views queryExternalExam (E.?. ExternalExamExamName)])
             , sortExamTime (queryExam . $(multifocusG 2) (to $ E.joinV . (E.?. ExamStart)) (to $ E.joinV . (E.?. ExamEnd)))
             , sortExamFinished (queryExam . to (E.joinV . (E.?. ExamFinished)))
@@ -236,12 +197,14 @@ getEOExamsR = do
                 -> hasReadAccessTo . urlRoute $ externalExamLink eexam :: DB Bool
                 | otherwise
                 -> return $ error "Got neither exam nor externalExam in result"
+            , singletonMap "has-results" . FilterProjected $ \(Any b) r -> (return $ b == (r ^. resultResults > 0) :: DB Bool)
+            , singletonMap "is-synced" . FilterProjected $ \(Any b) r -> (return $ b == (r ^. resultSynchronised >= r ^. resultResults) :: DB Bool)
             ]
           dbtFilterUI = mconcat
-            [
+            [ flip (prismAForm $ singletonFilter "is-synced" . maybePrism _PathPiece) $ aopt (boolField . Just $ SomeMessage MsgBoolIrrelevant) (fslI MsgExamSynchronised)
             ]
 
-          dbtStyle = def -- { dbsFilterLayout = defaultDBSFilterLayout }
+          dbtStyle = def { dbsFilterLayout = defaultDBSFilterLayout }
           dbtParams = def
 
           dbtIdent :: Text
@@ -255,6 +218,7 @@ getEOExamsR = do
       examsDBTableValidator = def
         & defaultSorting [SortAscBy "is-synced", SortAscBy "exam-time"]
         & forceFilter "may-access" (Any True)
+        & forceFilter "has-results" (Any True)
 
     dbTableWidget' examsDBTableValidator examsDBTable
 
diff --git a/src/Handler/Metrics.hs b/src/Handler/Metrics.hs
index 8eef6305d..4aa4c9a84 100644
--- a/src/Handler/Metrics.hs
+++ b/src/Handler/Metrics.hs
@@ -26,6 +26,7 @@ getMetricsR = selectRep $ do
       samples <- sortBy metricSort <$> collectMetrics
 
       metricsBearer <- runMaybeT . hoist runDB $ do
+        guardM $ hasGlobalGetParam GetGenerateToken
         uid <- MaybeT maybeAuthId
         guardM . lift . existsBy $ UniqueUserGroupMember UserGroupMetrics uid
 
diff --git a/src/Handler/Utils/StudyFeatures.hs b/src/Handler/Utils/StudyFeatures.hs
index 7e3dc481a..213657cdd 100644
--- a/src/Handler/Utils/StudyFeatures.hs
+++ b/src/Handler/Utils/StudyFeatures.hs
@@ -30,6 +30,8 @@ import qualified Database.Esqueleto as E
 import qualified Database.Esqueleto.PostgreSQL as E
 import qualified Database.Esqueleto.Utils as E
 
+import qualified Data.Conduit.Combinators as C
+
 
 data UserTableStudyFeature = UserTableStudyFeature
   { userTableField
@@ -114,20 +116,16 @@ isRelevantStudyFeature termField record studyFeatures
                E.&&. overlap studyFeatures' E.>. overlap studyFeatures
 
 isRelevantStudyFeatureCached :: PersistEntity record
-                             => EntityField record TermId
-                             -> E.SqlExpr (Entity record)
-                             -> E.SqlExpr (Entity StudyFeatures)
-                             -> E.SqlExpr (E.Value Bool)
+                              => EntityField record TermId
+                              -> E.SqlExpr (Entity record)
+                              -> E.SqlExpr (Entity StudyFeatures)
+                              -> E.SqlExpr (E.Value Bool)
 isRelevantStudyFeatureCached termField record studyFeatures
-  = E.bool calcNow useCache $ studyFeatures E.^. StudyFeaturesRelevanceCached
-  where
-    useCache
-      = E.exists . E.from $ \relevantStudyFeatures ->
-          E.where_ $ relevantStudyFeatures E.^. RelevantStudyFeaturesTerm E.==. record E.^. termField
-               E.&&. relevantStudyFeatures E.^. RelevantStudyFeaturesStudyFeatures E.==. studyFeatures E.^. StudyFeaturesId
-    calcNow = isRelevantStudyFeature termField record studyFeatures
+  = E.exists . E.from $ \relevantStudyFeatures ->
+      E.where_ $ relevantStudyFeatures E.^. RelevantStudyFeaturesTerm E.==. record E.^. termField
+           E.&&. relevantStudyFeatures E.^. RelevantStudyFeaturesStudyFeatures E.==. studyFeatures E.^. StudyFeaturesId
 
-cacheStudyFeatureRelevance :: MonadIO m
+cacheStudyFeatureRelevance :: MonadResource m
                            => (E.SqlExpr (Entity StudyFeatures) -> E.SqlExpr (E.Value Bool))
                            -> SqlPersistT m ()
 cacheStudyFeatureRelevance fFilter = do
@@ -139,9 +137,15 @@ cacheStudyFeatureRelevance fFilter = do
         return $ RelevantStudyFeatures E.<# (term E.^. TermId) E.<&> (studyFeatures E.^. StudyFeaturesId)
     )
     ( \_current _excluded -> [] )
-  E.update $ \studyFeatures -> do
-    E.set studyFeatures [ StudyFeaturesRelevanceCached E.=. E.true ]
-    E.where_ $ fFilter studyFeatures
+
+  let getStudyFeatures = E.selectSource . E.from $ \studyFeatures -> do
+        E.where_ $ fFilter studyFeatures
+        E.where_ . E.isNothing $ studyFeatures E.^. StudyFeaturesRelevanceCached
+        return $ studyFeatures E.^. StudyFeaturesId
+      migrateStudyFeatures genUUID lift' (E.Value sfId) = do
+        uuid <- genUUID
+        lift' $ update sfId [ StudyFeaturesRelevanceCached =. Just uuid ]
+   in runConduit $ getStudyFeatures .| randUUIDC (\genUUID lift' -> C.mapM_ $ migrateStudyFeatures genUUID lift')
 
 isCourseStudyFeature :: E.SqlExpr (Entity Course) -> E.SqlExpr (Entity StudyFeatures) -> E.SqlExpr (E.Value Bool)
 isCourseStudyFeature = isRelevantStudyFeatureCached CourseTerm
diff --git a/src/Handler/Utils/StudyFeatures/Parse.hs b/src/Handler/Utils/StudyFeatures/Parse.hs
index a0e749f86..516dd1b95 100644
--- a/src/Handler/Utils/StudyFeatures/Parse.hs
+++ b/src/Handler/Utils/StudyFeatures/Parse.hs
@@ -43,7 +43,7 @@ pStudyFeatures studyFeaturesUser now = do
           studyFeaturesSuperField = Nothing
           studyFeaturesFirstObserved = Just now
           studyFeaturesLastObserved = now
-          studyFeaturesRelevanceCached = False
+          studyFeaturesRelevanceCached = Nothing
       return StudyFeatures{..}
 
   pStudyFeature `sepBy1` char '#'
diff --git a/src/Handler/Utils/Users.hs b/src/Handler/Utils/Users.hs
index 65a7af6c0..cfd159c74 100644
--- a/src/Handler/Utils/Users.hs
+++ b/src/Handler/Utils/Users.hs
@@ -758,7 +758,7 @@ assimilateUser newUserId oldUserId = mapReaderT execWriterT $ do
               , StudyFeaturesFirstObserved =. (min `on` studyFeaturesFirstObserved) oldStudyFeatures newStudyFeatures
               , StudyFeaturesLastObserved =. (max `on` studyFeaturesLastObserved) oldStudyFeatures newStudyFeatures
               , StudyFeaturesValid =. ((||) `on` studyFeaturesValid) oldStudyFeatures newStudyFeatures
-              , StudyFeaturesRelevanceCached =. ((||) `on` studyFeaturesRelevanceCached) oldStudyFeatures newStudyFeatures
+              , StudyFeaturesRelevanceCached =. ((<|>) `on` studyFeaturesRelevanceCached) oldStudyFeatures newStudyFeatures
               ]
             E.insertSelectWithConflict
               UniqueRelevantStudyFeatures
diff --git a/src/Handler/Utils/Workflow/EdgeForm.hs b/src/Handler/Utils/Workflow/EdgeForm.hs
index 1e6b033f1..d7b932e82 100644
--- a/src/Handler/Utils/Workflow/EdgeForm.hs
+++ b/src/Handler/Utils/Workflow/EdgeForm.hs
@@ -81,14 +81,15 @@ workflowEdgeForm mwwId mPrev = runMaybeT $ do
   MsgRenderer mr <- getMsgRenderer
 
   ctx' <- bitraverse (MaybeT . getEntity) (MaybeT . getEntity) mwwId
-  let (scope, graph) = case ctx of
-        Left  WorkflowInstance{..} -> ( _DBWorkflowScope # workflowInstanceScope
-                                      , _DBWorkflowGraph # workflowInstanceGraph
-                                      )
-        Right WorkflowWorkflow{..} -> ( _DBWorkflowScope # workflowWorkflowScope
-                                      , _DBWorkflowGraph # workflowWorkflowGraph
-                                      )
-      wState = ctx ^? _Right . _workflowWorkflowState . to last . _wpTo
+  let (scope, sharedGraphId) = case ctx' of
+        Left  (Entity _ WorkflowInstance{..}) -> ( _DBWorkflowScope # workflowInstanceScope
+                                                 , workflowInstanceGraph
+                                                 )
+        Right (Entity _ WorkflowWorkflow{..}) -> ( _DBWorkflowScope # workflowWorkflowScope
+                                                 , workflowWorkflowGraph
+                                                 )
+  graph <- lift $ getSharedIdWorkflowGraph sharedGraphId
+  let wState = ctx ^? _Right . _workflowWorkflowState . to last . _wpTo
       wPayload' = ctx ^? _Right . _workflowWorkflowState . re _DBWorkflowState 
       ctx = bimap entityVal entityVal ctx'
   mAuthId <- maybeAuthId
diff --git a/src/Handler/Workflow/Definition/Edit.hs b/src/Handler/Workflow/Definition/Edit.hs
index 1f7dbf8cc..1967fc958 100644
--- a/src/Handler/Workflow/Definition/Edit.hs
+++ b/src/Handler/Workflow/Definition/Edit.hs
@@ -5,6 +5,7 @@ module Handler.Workflow.Definition.Edit
   ) where
 
 import Import
+import Utils.Workflow
 import Handler.Utils
 import Handler.Workflow.Definition.Form
 
@@ -29,7 +30,7 @@ postAWDEditR wds' wdn = do
             | Entity _ WorkflowDefinitionInstanceDescription{..} <- iDescs
             ]
 
-      wdfGraph <- toWorkflowGraphForm workflowDefinitionGraph
+      wdfGraph <- toWorkflowGraphForm =<< getSharedDBWorkflowGraph workflowDefinitionGraph
 
       return WorkflowDefinitionForm
         { wdfScope = workflowDefinitionScope
@@ -44,9 +45,10 @@ postAWDEditR wds' wdn = do
 
     act <- formResultMaybe editRes $ \WorkflowDefinitionForm{..} -> do
       wdfGraph' <- fromWorkflowGraphForm wdfGraph
+      wdfGraph'' <- insertSharedWorkflowGraph wdfGraph'
       
       insConflict <- replaceUnique wdId WorkflowDefinition
-        { workflowDefinitionGraph = wdfGraph'
+        { workflowDefinitionGraph = wdfGraph''
         , workflowDefinitionScope = wdfScope
         , workflowDefinitionName = wdfName
         , workflowDefinitionInstanceCategory = wdfInstanceCategory
diff --git a/src/Handler/Workflow/Definition/Instantiate.hs b/src/Handler/Workflow/Definition/Instantiate.hs
index 4f0773167..fbac35cd6 100644
--- a/src/Handler/Workflow/Definition/Instantiate.hs
+++ b/src/Handler/Workflow/Definition/Instantiate.hs
@@ -3,6 +3,7 @@ module Handler.Workflow.Definition.Instantiate
   ) where
 
 import Import
+import Utils.Workflow
 import Handler.Utils
 import Handler.Utils.Workflow.Form
 
@@ -22,9 +23,10 @@ postAWDInstantiateR wds' wdn = do
             & over _wisTerm   unTermKey
             & over _wisSchool unSchoolKey
             & over _wisCourse (view _SqlKey)
+      workflowInstanceGraph <- insertSharedWorkflowGraph wifGraph'
       instId <- insertUnique WorkflowInstance
         { workflowInstanceDefinition = Just wdId
-        , workflowInstanceGraph = wifGraph'
+        , workflowInstanceGraph
         , workflowInstanceScope = wifScope'
         , workflowInstanceName = wifName
         , workflowInstanceCategory = wifCategory
diff --git a/src/Handler/Workflow/Definition/New.hs b/src/Handler/Workflow/Definition/New.hs
index 898c3b831..827986354 100644
--- a/src/Handler/Workflow/Definition/New.hs
+++ b/src/Handler/Workflow/Definition/New.hs
@@ -5,6 +5,7 @@ module Handler.Workflow.Definition.New
 import Import
 import Handler.Utils
 import Handler.Workflow.Definition.Form
+import Utils.Workflow
 
 
 getAdminWorkflowDefinitionNewR, postAdminWorkflowDefinitionNewR :: Handler Html
@@ -15,9 +16,10 @@ postAdminWorkflowDefinitionNewR = do
 
     act <- formResultMaybe newRes $ \WorkflowDefinitionForm{ .. } -> do
       wdfGraph' <- fromWorkflowGraphForm wdfGraph
+      workflowDefinitionGraph <- insertSharedWorkflowGraph wdfGraph'
       
       insRes <- insertUnique WorkflowDefinition
-        { workflowDefinitionGraph = wdfGraph'
+        { workflowDefinitionGraph
         , workflowDefinitionScope = wdfScope
         , workflowDefinitionName = wdfName
         , workflowDefinitionInstanceCategory = wdfInstanceCategory
diff --git a/src/Handler/Workflow/Instance/Form.hs b/src/Handler/Workflow/Instance/Form.hs
index 549158565..246ac38cf 100644
--- a/src/Handler/Workflow/Instance/Form.hs
+++ b/src/Handler/Workflow/Instance/Form.hs
@@ -64,7 +64,7 @@ workflowInstanceForm forcedDefId template = renderWForm FormStandard $ do
       [ (workflowDefinitionInstanceDescriptionLanguage, (workflowDefinitionInstanceDescriptionTitle, workflowDefinitionInstanceDescriptionDescription))
       | Entity _ WorkflowDefinitionInstanceDescription{..} <- descs
       ]
-  defGraph <- for defEnt $ toWorkflowGraphForm . workflowDefinitionGraph . entityVal
+  defGraph <- for defEnt $ toWorkflowGraphForm <=< lift . lift . getSharedDBWorkflowGraph . workflowDefinitionGraph . entityVal
 
   wifScopeRes <- aFormToWForm . hoistAForm lift $ workflowInstanceScopeForm (workflowDefinitionScope . entityVal <$> defEnt) (fslI MsgWorkflowScope) (wifScope <$> template)
   wifNameRes <- wreq ciField (fslI MsgWorkflowInstanceName) (fmap wifName template <|> fmap (workflowDefinitionName . entityVal) defEnt)
diff --git a/src/Handler/Workflow/Instance/Initiate.hs b/src/Handler/Workflow/Instance/Initiate.hs
index f9f5677b2..fda1576d6 100644
--- a/src/Handler/Workflow/Instance/Initiate.hs
+++ b/src/Handler/Workflow/Instance/Initiate.hs
@@ -45,7 +45,8 @@ workflowInstanceInitiateR rScope win = do
     ((edgeRes, edgeView), edgeEnc) <- liftHandler . runFormPost $ renderAForm FormStandard edgeForm
 
     edgeAct <- formResultMaybe edgeRes $ \edgeRes' -> do
-      workflowWorkflowState <- view _DBWorkflowState <$> followEdge (_DBWorkflowGraph # workflowInstanceGraph) edgeRes' Nothing
+      wGraph <- getSharedIdWorkflowGraph workflowInstanceGraph
+      workflowWorkflowState <- view _DBWorkflowState <$> followEdge wGraph edgeRes' Nothing
       
       wwId <- insert WorkflowWorkflow
         { workflowWorkflowInstance = Just wiId
diff --git a/src/Handler/Workflow/Instance/New.hs b/src/Handler/Workflow/Instance/New.hs
index c02f6d2e8..e715c62ba 100644
--- a/src/Handler/Workflow/Instance/New.hs
+++ b/src/Handler/Workflow/Instance/New.hs
@@ -25,13 +25,14 @@ adminWorkflowInstanceNewR wdId = do
 
     act <- formResultMaybe instRes $ \WorkflowInstanceForm{..} -> do
       wifGraph' <- fromWorkflowGraphForm wifGraph
+      workflowInstanceGraph <- insertSharedWorkflowGraph wifGraph'
       let wifScope' = wifScope
             & over _wisTerm   unTermKey
             & over _wisSchool unSchoolKey
             & over _wisCourse (view _SqlKey)
       instId <- insertUnique WorkflowInstance
         { workflowInstanceDefinition = wdId
-        , workflowInstanceGraph = wifGraph'
+        , workflowInstanceGraph
         , workflowInstanceScope = wifScope'
         , workflowInstanceName = wifName
         , workflowInstanceCategory = wifCategory
diff --git a/src/Handler/Workflow/Workflow/List.hs b/src/Handler/Workflow/Workflow/List.hs
index c9333ccbb..97d56fb28 100644
--- a/src/Handler/Workflow/Workflow/List.hs
+++ b/src/Handler/Workflow/Workflow/List.hs
@@ -231,8 +231,8 @@ workflowWorkflowList (title, heading) WWListColumns{..} sqlPred = do
               MaybeT $ selectWorkflowInstanceDescription wiId
             cID <- encrypt wwId
             rScope <- lift . runMaybeT . toRouteWorkflowScope $ _DBWorkflowScope # workflowWorkflowScope
-            let WorkflowGraph{..} = ww ^. _entityVal . _workflowWorkflowGraph . from _DBWorkflowGraph
-                hasWorkflowRole' :: WorkflowRole UserId -> DB Bool
+            WorkflowGraph{..} <- lift . getSharedIdWorkflowGraph $ ww ^. _entityVal . _workflowWorkflowGraph
+            let hasWorkflowRole' :: WorkflowRole UserId -> DB Bool
                 hasWorkflowRole' role = maybeT (return False) $ do
                   rScope' <- hoistMaybe rScope
                   let canonRoute = _WorkflowScopeRoute # (rScope', WorkflowWorkflowR cID WWWorkflowR)
@@ -360,6 +360,8 @@ workflowWorkflowList (title, heading) WWListColumns{..} sqlPred = do
                 jwiScope <- toRouteWorkflowScope $ _DBWorkflowScope # workflowInstanceScope
                 let jwiName = workflowInstanceName
                 return JsonWorkflowInstance{..}
+              let Entity _ WorkflowWorkflow{..} = res ^. resultWorkflowWorkflow
+              WorkflowGraph{..} <- getSharedIdWorkflowGraph workflowWorkflowGraph
               (fmap getLast -> wState) <-
                 let go :: forall m.
                           ( MonadHandler m
@@ -410,9 +412,7 @@ workflowWorkflowList (title, heading) WWListColumns{..} sqlPred = do
 
                       tell . Just $ Last (stCID, nTo, aUser, wpTime, payload)
 
-                    Entity _ WorkflowWorkflow{..} = res ^. resultWorkflowWorkflow
                     wState = review _DBWorkflowState workflowWorkflowState
-                    WorkflowGraph{..} = _DBWorkflowGraph # workflowWorkflowGraph
                  in runConduit $ sourceWorkflowActionInfos wwId wState .| execWriterC (C.mapM_ go)
 
               let jwwLastAction = wState <&> \(jwaIx, jwaTo, jwaUser, jwaTime, _) -> JsonWorkflowAction{..}
diff --git a/src/Handler/Workflow/Workflow/Workflow.hs b/src/Handler/Workflow/Workflow/Workflow.hs
index f63f95e43..430d8aa59 100644
--- a/src/Handler/Workflow/Workflow/Workflow.hs
+++ b/src/Handler/Workflow/Workflow/Workflow.hs
@@ -83,8 +83,8 @@ workflowR rScope cID = do
     WorkflowWorkflow{..} <- get404 wwId
     maybeT notFound . void . assertM (== review _DBWorkflowScope workflowWorkflowScope) $ fromRouteWorkflowScope rScope
     mEdgeForm <- workflowEdgeForm (Right wwId) Nothing
+    wGraph <- getSharedIdWorkflowGraph workflowWorkflowGraph
     let canonRoute = _WorkflowScopeRoute # (rScope, WorkflowWorkflowR cID WWWorkflowR)
-        wGraph = _DBWorkflowGraph # workflowWorkflowGraph
 
     mEdge <- for mEdgeForm $ \edgeForm -> do
       ((edgeRes, edgeView), edgeEnc) <- liftHandler . runFormPost $ renderAForm FormStandard edgeForm
diff --git a/src/Jobs.hs b/src/Jobs.hs
index 642692491..a5ebcb40d 100644
--- a/src/Jobs.hs
+++ b/src/Jobs.hs
@@ -10,6 +10,7 @@ module Jobs
 import Import hiding (StateT)
 import Jobs.Types as Types hiding (JobCtl(JobCtlQueue))
 import Jobs.Queue
+import Jobs.Offload
 import Jobs.Crontab
 
 import qualified Data.Conduit.List as C
@@ -64,6 +65,7 @@ import Jobs.Handler.Files
 import Jobs.Handler.ExternalApis
 import Jobs.Handler.PersonalisedSheetFiles
 import Jobs.Handler.PruneOldSentMails
+import Jobs.Handler.StudyFeatures
 
 import Jobs.HealthReport
 
@@ -106,6 +108,7 @@ handleJobs foundation@UniWorX{..}
       jobShutdown <- liftIO newEmptyTMVarIO
       jobCurrentCrontab <- liftIO $ newTVarIO Nothing
       jobHeldLocks <- liftIO $ newTVarIO Set.empty
+      jobOffload <- liftIO newEmptyTMVarIO
       registerJobHeldLocksCount jobHeldLocks
       registerJobWorkerQueueDepth appJobState
       atomically $ putTMVar appJobState JobState
@@ -156,7 +159,9 @@ manageJobPool foundation@UniWorX{..} unmask = shutdownOnException $ \routeExc ->
       atomically . asum $
         [ spawnMissingWorkers
         , reapDeadWorkers
-        ] ++ maybe [] (\(cTime, delay) -> [return () <$ waitDelay delay, transferJobs cTime]) transferInfo ++
+        ] ++ maybe [] (\(cTime, delay) -> [return () <$ waitDelay delay, transferJobs cTime]) transferInfo
+          ++ maybeToList (manageOffloadHandler <$> mkJobOffloadHandler (appDatabaseConf appSettings') (appJobMode appSettings'))
+          ++
         [ terminateGracefully terminate'
         ]
   where
@@ -287,6 +292,27 @@ manageJobPool foundation@UniWorX{..} unmask = shutdownOnException $ \routeExc ->
 
       return $ $logWarnS "JobPoolManager" [st|Moved #{tshow (olength movePairs)} long-unadressed jobs from #{tshow (olength senders)} senders to #{tshow (olength receivers)} receivers|]
 
+    manageOffloadHandler :: ReaderT UniWorX m JobOffloadHandler -> STM (ContT () m ())
+    manageOffloadHandler spawn = do
+      shouldTerminate' <- readTMVar appJobState >>= fmap not . isEmptyTMVar . jobShutdown
+      guard $ not shouldTerminate'
+
+      JobContext{jobOffload} <- jobContext <$> readTMVar appJobState
+      cOffload <- tryReadTMVar jobOffload
+
+      let respawn = do
+            nOffload <- lift $ runReaderT spawn foundation
+            atomically $ do
+              putTMVar jobOffload nOffload
+              whenIsJust cOffload $ \pOffload -> do
+                pOutgoing <- readTVar $ jobOffloadOutgoing pOffload
+                modifyTVar (jobOffloadOutgoing nOffload) (pOutgoing <>)
+
+      respawn <$ case cOffload of
+        Nothing -> return ()
+        Just JobOffloadHandler{..} -> waitSTM jobOffloadHandler
+      
+
 stopJobCtl :: MonadUnliftIO m => UniWorX -> m ()
 -- ^ Stop all worker threads currently running
 stopJobCtl UniWorX{appJobState} = do
@@ -472,46 +498,55 @@ handleJobs' wNum = C.mapM_ $ \jctl -> hoist delimitInternalState . withJobWorker
       $logDebugS logIdent "JobCtlQueue..."
       lift $ queueJob' job
       $logInfoS logIdent "JobCtlQueue"
-    handleCmd (JobCtlPerform jId) = handle handleQueueException . jLocked jId $ \(Entity _ j@QueuedJob{..}) -> lift $ do
-      content <- case fromJSON queuedJobContent of
-        Aeson.Success c -> return c
-        Aeson.Error t -> do
-          $logErrorS logIdent $ "Aeson decoding error: " <> pack t
-          throwM $ JInvalid jId j
-      
-      $logInfoS logIdent $ tshow content
-      $logDebugS logIdent . LT.toStrict . decodeUtf8 $ Aeson.encode content
+    handleCmd (JobCtlPerform jId) = do
+      jMode <- getsYesod $ view _appJobMode
+      case jMode of
+        JobsLocal{} -> performLocal
+        JobsOffload -> performOffload
+      where
+        performOffload = hoist atomically $ do
+          JobOffloadHandler{..} <- lift . readTMVar =<< asks jobOffload
+          lift $ modifyTVar jobOffloadOutgoing (`snoc` jId)
+        performLocal = handle handleQueueException . jLocked jId $ \(Entity _ j@QueuedJob{..}) -> lift $ do
+          content <- case fromJSON queuedJobContent of
+            Aeson.Success c -> return c
+            Aeson.Error t -> do
+              $logErrorS logIdent $ "Aeson decoding error: " <> pack t
+              throwM $ JInvalid jId j
 
-      instanceID' <- getsYesod $ view instanceID
-      now <- liftIO getCurrentTime
+          $logInfoS logIdent $ tshow content
+          $logDebugS logIdent . LT.toStrict . decodeUtf8 $ Aeson.encode content
 
-      let cleanup = do
-            when queuedJobWriteLastExec $
-              void $ upsertBy
-                (UniqueCronLastExec queuedJobContent)
-                CronLastExec
-                  { cronLastExecJob = queuedJobContent
-                  , cronLastExecTime = now
-                  , cronLastExecInstance = instanceID'
-                  }
-                [ CronLastExecTime =. now
-                , CronLastExecInstance =. instanceID'
-                ]
-            delete jId
+          instanceID' <- getsYesod $ view instanceID
+          now <- liftIO getCurrentTime
 
-      case performJob content of
-        JobHandlerAtomic act -> runDBJobs . setSerializableBatch $ do
-          act & withJobWorkerState wNum (JobWorkerExecJob content)
-          hoist lift cleanup
-        JobHandlerException act -> do
-          act & withJobWorkerState wNum (JobWorkerExecJob content)
-          runDB $ setSerializableBatch cleanup
-        JobHandlerAtomicWithFinalizer act fin -> do
-          res <- runDBJobs . setSerializableBatch $ do
-            res <- act & withJobWorkerState wNum (JobWorkerExecJob content)
-            hoist lift cleanup
-            return res
-          fin res
+          let cleanup = do
+                when queuedJobWriteLastExec $
+                  void $ upsertBy
+                    (UniqueCronLastExec queuedJobContent)
+                    CronLastExec
+                      { cronLastExecJob = queuedJobContent
+                      , cronLastExecTime = now
+                      , cronLastExecInstance = instanceID'
+                      }
+                    [ CronLastExecTime =. now
+                    , CronLastExecInstance =. instanceID'
+                    ]
+                delete jId
+
+          case performJob content of
+            JobHandlerAtomic act -> runDBJobs . setSerializableBatch $ do
+              act & withJobWorkerState wNum (JobWorkerExecJob content)
+              hoist lift cleanup
+            JobHandlerException act -> do
+              act & withJobWorkerState wNum (JobWorkerExecJob content)
+              runDB $ setSerializableBatch cleanup
+            JobHandlerAtomicWithFinalizer act fin -> do
+              res <- runDBJobs . setSerializableBatch $ do
+                res <- act & withJobWorkerState wNum (JobWorkerExecJob content)
+                hoist lift cleanup
+                return res
+              fin res
     handleCmd JobCtlDetermineCrontab = do
       $logDebugS logIdent "DetermineCrontab..."
       newCTab <- liftHandler . runDB $ setSerializableBatch determineCrontab'
diff --git a/src/Jobs/Crontab.hs b/src/Jobs/Crontab.hs
index c4944141c..dfacd3172 100644
--- a/src/Jobs/Crontab.hs
+++ b/src/Jobs/Crontab.hs
@@ -27,17 +27,6 @@ determineCrontab :: DB (Crontab JobCtl)
 determineCrontab = execWriterT $ do
   UniWorX{ appSettings' = AppSettings{..} } <- getYesod
 
-  case appJobFlushInterval of
-    Just interval -> tell $ HashMap.singleton
-      JobCtlFlush
-      Cron
-        { cronInitial = CronAsap
-        , cronRepeat = CronRepeatScheduled CronAsap
-        , cronRateLimit = interval
-        , cronNotAfter = Right CronNotScheduled
-        }
-    Nothing -> return ()
-
   whenIsJust appJobCronInterval $ \interval ->
     tell $ HashMap.singleton
       JobCtlDetermineCrontab
@@ -48,77 +37,6 @@ determineCrontab = execWriterT $ do
         , cronNotAfter = Right CronNotScheduled
         }
 
-  oldestInvitationMUTC <- lift $ preview (_head . _entityVal . _invitationExpiresAt . _Just) <$> selectList [InvitationExpiresAt !=. Nothing] [Asc InvitationExpiresAt, LimitTo 1]
-  whenIsJust oldestInvitationMUTC $ \oldestInvUTC -> tell $ HashMap.singleton
-    (JobCtlQueue JobPruneInvitations)
-    Cron
-      { cronInitial   = CronTimestamp $ utcToLocalTime oldestInvUTC
-      , cronRepeat    = CronRepeatOnChange
-      , cronRateLimit = nominalDay
-      , cronNotAfter  = Right CronNotScheduled
-      }
-
-  oldestSessionFile <- lift $ preview (_head . _entityVal . _sessionFileTouched) <$> selectList [] [Asc SessionFileTouched, LimitTo 1]
-  whenIsJust oldestSessionFile $ \oldest -> tell $ HashMap.singleton
-    (JobCtlQueue JobPruneSessionFiles)
-    Cron
-      { cronInitial   = CronTimestamp . utcToLocalTime $ addUTCTime appSessionFilesExpire oldest
-      , cronRepeat    = CronRepeatOnChange
-      , cronRateLimit = appSessionFilesExpire / 2
-      , cronNotAfter  = Right CronNotScheduled
-      }
-
-  oldestFallbackPersonalisedSheetFilesKey <- lift $ preview (_head . _entityVal . _fallbackPersonalisedSheetFilesKeyGenerated) <$> selectList [] [Asc FallbackPersonalisedSheetFilesKeyGenerated, LimitTo 1]
-  whenIsJust oldestFallbackPersonalisedSheetFilesKey $ \oldest -> tell $ HashMap.singleton
-    (JobCtlQueue JobPruneFallbackPersonalisedSheetFilesKeys)
-    Cron
-      { cronInitial   = CronTimestamp . utcToLocalTime $ addUTCTime appFallbackPersonalisedSheetFilesKeysExpire oldest
-      , cronRepeat    = CronRepeatOnChange
-      , cronRateLimit = appFallbackPersonalisedSheetFilesKeysExpire / 2
-      , cronNotAfter  = Right CronNotScheduled
-      }
-
-  oldestSentMail <- lift $ preview (_head . _entityVal . _sentMailSentAt) <$> selectList [] [Asc SentMailSentAt, LimitTo 1]
-  whenIsJust ((,) <$> appMailRetainSent <*> oldestSentMail) $ \(retain, oldest) -> tell $ HashMap.singleton
-    (JobCtlQueue JobPruneOldSentMails)
-    Cron
-      { cronInitial   = CronTimestamp . utcToLocalTime $ addUTCTime retain oldest
-      , cronRepeat    = CronRepeatOnChange
-      , cronRateLimit = retain / 2
-      , cronNotAfter  = Right CronNotScheduled
-      }
-
-
-  whenIsJust (appInjectFiles <* appUploadCacheConf) $ \iInterval ->
-    tell $ HashMap.singleton
-      (JobCtlQueue JobInjectFiles)
-      Cron
-        { cronInitial   = CronAsap
-        , cronRepeat    = CronRepeatScheduled CronAsap
-        , cronRateLimit = iInterval
-        , cronNotAfter  = Right CronNotScheduled
-        }
-
-  whenIsJust appRechunkFiles $ \rInterval ->
-    tell $ HashMap.singleton
-      (JobCtlQueue JobRechunkFiles)
-      Cron
-        { cronInitial   = CronAsap
-        , cronRepeat    = CronRepeatScheduled CronAsap
-        , cronRateLimit = rInterval
-        , cronNotAfter  = Right CronNotScheduled
-        }
-
-  whenIsJust appCheckMissingFiles $ \rInterval ->
-    tell $ HashMap.singleton
-      (JobCtlQueue JobDetectMissingFiles)
-      Cron
-        { cronInitial     = CronAsap
-        , cronRepeat      = CronRepeatScheduled CronAsap
-        , cronRateLimit   = rInterval
-        , cronNotAfter    = Right CronNotScheduled
-        }
-
   tell . flip foldMap universeF $ \kind ->
     case appHealthCheckInterval kind of
       Just int -> HashMap.singleton
@@ -131,368 +49,478 @@ determineCrontab = execWriterT $ do
           }
       Nothing  -> mempty
 
-  let newyear = cronCalendarAny
-        { cronDayOfYear  = cronMatchOne 1
-        }
-   in tell $ HashMap.singleton
-        (JobCtlQueue JobTruncateTransactionLog)
+  when (is _JobsLocal appJobMode) $ do
+    case appJobFlushInterval of
+      Just interval -> tell $ HashMap.singleton
+        JobCtlFlush
         Cron
-          { cronInitial = newyear
-          , cronRepeat = CronRepeatScheduled newyear
-          , cronRateLimit = minNominalYear
+          { cronInitial = CronAsap
+          , cronRepeat = CronRepeatScheduled CronAsap
+          , cronRateLimit = interval
           , cronNotAfter = Right CronNotScheduled
           }
+      Nothing -> return ()
 
-  oldestLogEntry <- fmap listToMaybe . lift . E.select . E.from $ \transactionLog -> do
-    E.where_ . E.not_ . E.isNothing $ transactionLog E.^. TransactionLogRemote
-    E.orderBy [E.asc $ transactionLog E.^. TransactionLogTime]
-    E.limit 1
-    return $ transactionLog E.^. TransactionLogTime
-  for_ oldestLogEntry $ \(E.Value oldestEntry) ->
-    tell $ HashMap.singleton
-      (JobCtlQueue JobDeleteTransactionLogIPs)
+    oldestInvitationMUTC <- lift $ preview (_head . _entityVal . _invitationExpiresAt . _Just) <$> selectList [InvitationExpiresAt !=. Nothing] [Asc InvitationExpiresAt, LimitTo 1]
+    whenIsJust oldestInvitationMUTC $ \oldestInvUTC -> tell $ HashMap.singleton
+      (JobCtlQueue JobPruneInvitations)
       Cron
-        { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appTransactionLogIPRetentionTime oldestEntry
+        { cronInitial   = CronTimestamp $ utcToLocalTime oldestInvUTC
         , cronRepeat    = CronRepeatOnChange
         , cronRateLimit = nominalDay
         , cronNotAfter  = Right CronNotScheduled
         }
 
-  let
-    getNextIntervals within interval cInterval = do
-      now <- liftIO getPOSIXTime
-      return $ do
-        let
-          epochInterval = within / 2
-          (currEpoch, epochNow) = now `divMod'` epochInterval
-          currInterval = epochNow `div'` interval
-          numIntervals = max 1 . floor $ epochInterval / interval
-          n = ceiling $ 4 * cInterval / interval
-        i <- [ negate (ceiling $ n % 2) .. ceiling $ n % 2 ]
-        let
-          ((+ currEpoch) -> nextEpoch, nextInterval) = (currInterval + i) `divMod` numIntervals
-          nextIntervalTime
-            = posixSecondsToUTCTime $ fromInteger nextEpoch * epochInterval + fromInteger nextInterval * interval
-        return (nextEpoch, nextInterval, nextIntervalTime, numIntervals)
-
-  if
-    | is _Just appLdapConf
-    , Just syncWithin <- appSynchroniseLdapUsersWithin
-    , Just cInterval <- appJobCronInterval
-      -> do
-        nextIntervals <- getNextIntervals syncWithin appSynchroniseLdapUsersInterval cInterval
-
-        forM_ nextIntervals $ \(nextEpoch, nextInterval, nextIntervalTime, numIntervals) -> do
-          tell $ HashMap.singleton
-            (JobCtlQueue JobSynchroniseLdap
-               { jEpoch         = fromInteger nextEpoch
-               , jNumIterations = fromInteger numIntervals
-               , jIteration     = fromInteger nextInterval
-               })
-            Cron
-              { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ nextIntervalTime
-              , cronRepeat    = CronRepeatNever
-              , cronRateLimit = appSynchroniseLdapUsersInterval
-              , cronNotAfter  = Left syncWithin
-              }
-    | otherwise
-     -> return ()
-
-  whenIsJust ((,) <$> appPruneUnreferencedFilesWithin <*> appJobCronInterval) $ \(within, cInterval) -> do
-    nextIntervals <- getNextIntervals within appPruneUnreferencedFilesInterval cInterval
-    forM_ nextIntervals $ \(nextEpoch, nextInterval, nextIntervalTime, numIntervals) -> do
-      tell $ HashMap.singleton
-        (JobCtlQueue JobPruneUnreferencedFiles
-           { jEpoch         = fromInteger nextEpoch
-           , jNumIterations = fromInteger numIntervals
-           , jIteration     = fromInteger nextInterval
-           }
-        )
-        Cron
-          { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ nextIntervalTime
-          , cronRepeat    = CronRepeatNever
-          , cronRateLimit = appPruneUnreferencedFilesInterval
-          , cronNotAfter  = Left within
-          }
-
-  let
-    sheetJobs (Entity nSheet Sheet{..}) = do
-      for_ (max <$> sheetVisibleFrom <*> sheetActiveFrom) $ \aFrom ->
-        tell $ HashMap.singleton
-          (JobCtlQueue $ JobQueueNotification NotificationSheetActive{..})
-          Cron
-            { cronInitial = CronTimestamp $ utcToLocalTimeTZ appTZ aFrom
-            , cronRepeat = CronRepeatNever
-            , cronRateLimit = appNotificationRateLimit
-            , cronNotAfter = maybe (Left appNotificationExpiration) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) sheetActiveTo
-            }
-      for_ (max <$> sheetVisibleFrom <*> sheetHintFrom) $ \hFrom -> maybeT (return ()) $ do
-        guard $ maybe True (\aFrom -> abs (diffUTCTime aFrom hFrom) > 300) sheetActiveFrom
-        guardM $ or2M (return $ maybe True (\sFrom -> abs (diffUTCTime sFrom hFrom) > 300) sheetSolutionFrom)
-                      (fmap not . lift . lift $ exists [SheetFileType ==. SheetSolution, SheetFileSheet ==. nSheet])
-        guardM . lift . lift $ exists [SheetFileType ==. SheetHint, SheetFileSheet ==. nSheet]
-        tell $ HashMap.singleton
-          (JobCtlQueue $ JobQueueNotification NotificationSheetHint{..})
-          Cron
-            { cronInitial = CronTimestamp $ utcToLocalTimeTZ appTZ hFrom
-            , cronRepeat = CronRepeatNever
-            , cronRateLimit = appNotificationRateLimit
-            , cronNotAfter = maybe (Left appNotificationExpiration) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) sheetActiveTo
-            }
-      for_ (max <$> sheetVisibleFrom <*> sheetSolutionFrom) $ \sFrom -> maybeT (return ()) $ do
-        guard $ maybe True (\aFrom -> abs (diffUTCTime aFrom sFrom) > 300) sheetActiveFrom
-        guardM . lift . lift $ exists [SheetFileType ==. SheetSolution, SheetFileSheet ==. nSheet]
-        tell $ HashMap.singleton
-          (JobCtlQueue $ JobQueueNotification NotificationSheetSolution{..})
-          Cron
-            { cronInitial = CronTimestamp $ utcToLocalTimeTZ appTZ sFrom
-            , cronRepeat = CronRepeatNever
-            , cronRateLimit = appNotificationRateLimit
-            , cronNotAfter = Left nominalDay
-            }
-      for_ sheetActiveTo $ \aTo -> do
-        whenIsJust (max aTo <$> sheetVisibleFrom) $ \aTo' -> do
-          tell $ HashMap.singleton
-            (JobCtlQueue $ JobQueueNotification NotificationSheetSoonInactive{..})
-            Cron
-              { cronInitial = CronTimestamp . utcToLocalTimeTZ appTZ . maybe id max sheetActiveFrom $ addUTCTime (-nominalDay) aTo'
-              , cronRepeat = CronRepeatOnChange -- Allow repetition of the notification (if something changes), but wait at least an hour
-              , cronRateLimit = appNotificationRateLimit
-              , cronNotAfter = Right . CronTimestamp $ utcToLocalTimeTZ appTZ aTo
-              }
-          tell $ HashMap.singleton
-            (JobCtlQueue $ JobQueueNotification NotificationSheetInactive{..})
-            Cron
-              { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ aTo
-              , cronRepeat    = CronRepeatOnChange
-              , cronRateLimit = appNotificationRateLimit
-              , cronNotAfter  = Left appNotificationExpiration
-              }
-        when sheetAutoDistribute $
-          tell $ HashMap.singleton
-            (JobCtlQueue $ JobDistributeCorrections nSheet)
-            Cron
-              { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ aTo
-              , cronRepeat    = CronRepeatNever
-              , cronRateLimit = 3600 -- Irrelevant due to `cronRepeat`
-              , cronNotAfter  = Left nominalDay
-              }
-
-  runConduit $ transPipe lift (selectSource [] []) .| C.mapM_ sheetJobs
-
-  let
-    correctorNotifications :: Map (UserId, SheetId) (Max UTCTime) -> WriterT (Crontab JobCtl) DB ()
-    correctorNotifications = (tell .) . Map.foldMapWithKey $ \(nUser, nSheet) (Max time) -> HashMap.singleton
-      (JobCtlQueue $ JobQueueNotification NotificationCorrectionsAssigned { nUser, nSheet } )
+    oldestSessionFile <- lift $ preview (_head . _entityVal . _sessionFileTouched) <$> selectList [] [Asc SessionFileTouched, LimitTo 1]
+    whenIsJust oldestSessionFile $ \oldest -> tell $ HashMap.singleton
+      (JobCtlQueue JobPruneSessionFiles)
       Cron
-        { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appNotificationCollateDelay time
-        , cronRepeat    = CronRepeatNever
-        , cronRateLimit = appNotificationRateLimit
-        , cronNotAfter  = Left appNotificationExpiration
+        { cronInitial   = CronTimestamp . utcToLocalTime $ addUTCTime appSessionFilesExpire oldest
+        , cronRepeat    = CronRepeatOnChange
+        , cronRateLimit = appSessionFilesExpire / 2
+        , cronNotAfter  = Right CronNotScheduled
         }
 
-    submissionsByCorrector :: Entity Submission -> Map (UserId, SheetId) (Max UTCTime)
-    submissionsByCorrector (Entity _ sub)
-      | Just ratingBy <- submissionRatingBy sub
-      , Just assigned <- submissionRatingAssigned sub
-      , not $ submissionRatingDone sub
-      = Map.singleton (ratingBy, submissionSheet sub) $ Max assigned
-      | otherwise
-      = Map.empty
+    oldestFallbackPersonalisedSheetFilesKey <- lift $ preview (_head . _entityVal . _fallbackPersonalisedSheetFilesKeyGenerated) <$> selectList [] [Asc FallbackPersonalisedSheetFilesKeyGenerated, LimitTo 1]
+    whenIsJust oldestFallbackPersonalisedSheetFilesKey $ \oldest -> tell $ HashMap.singleton
+      (JobCtlQueue JobPruneFallbackPersonalisedSheetFilesKeys)
+      Cron
+        { cronInitial   = CronTimestamp . utcToLocalTime $ addUTCTime appFallbackPersonalisedSheetFilesKeysExpire oldest
+        , cronRepeat    = CronRepeatOnChange
+        , cronRateLimit = appFallbackPersonalisedSheetFilesKeysExpire / 2
+        , cronNotAfter  = Right CronNotScheduled
+        }
 
-    collateSubmissionsByCorrector acc entity = Map.unionWith (<>) acc $ submissionsByCorrector entity
-  correctorNotifications <=< runConduit $
-       transPipe lift ( selectSource [ SubmissionRatingBy !=. Nothing, SubmissionRatingAssigned !=. Nothing ] []
-                      )
-    .| C.fold collateSubmissionsByCorrector Map.empty
+    oldestSentMail <- lift $ preview (_head . _entityVal . _sentMailSentAt) <$> selectList [] [Asc SentMailSentAt, LimitTo 1]
+    whenIsJust ((,) <$> appMailRetainSent <*> oldestSentMail) $ \(retain, oldest) -> tell $ HashMap.singleton
+      (JobCtlQueue JobPruneOldSentMails)
+      Cron
+        { cronInitial   = CronTimestamp . utcToLocalTime $ addUTCTime retain oldest
+        , cronRepeat    = CronRepeatOnChange
+        , cronRateLimit = retain / 2
+        , cronNotAfter  = Right CronNotScheduled
+        }
 
 
-  let
-    examSelect = E.selectSource . E.from $ \(exam `E.InnerJoin` course `E.InnerJoin` school) -> do
-      E.on $ school E.^. SchoolId E.==. course E.^. CourseSchool
-      E.on $ course E.^. CourseId E.==. exam E.^. ExamCourse
-      return (exam, course, school)
-    examJobs (Entity nExam Exam{..}, _, Entity _ School{..}) = do
-      newestResult <- lift . E.select . E.from $ \examResult -> do
-        E.where_ $ examResult E.^. ExamResultExam E.==. E.val nExam
-        return . E.max_ $ examResult E.^. ExamResultLastChanged
+    whenIsJust (appInjectFiles <* appUploadCacheConf) $ \iInterval ->
+      tell $ HashMap.singleton
+        (JobCtlQueue JobInjectFiles)
+        Cron
+          { cronInitial   = CronAsap
+          , cronRepeat    = CronRepeatScheduled CronAsap
+          , cronRateLimit = iInterval
+          , cronNotAfter  = Right CronNotScheduled
+          }
 
-      whenIsJust examVisibleFrom $ \visibleFrom -> do
-        case over (mapped . _Value) ((max `on` NTop) examFinished) newestResult of
-          [E.Value (NTop (Just ts))] ->
+    whenIsJust appRechunkFiles $ \rInterval ->
+      tell $ HashMap.singleton
+        (JobCtlQueue JobRechunkFiles)
+        Cron
+          { cronInitial   = CronAsap
+          , cronRepeat    = CronRepeatScheduled CronAsap
+          , cronRateLimit = rInterval
+          , cronNotAfter  = Right CronNotScheduled
+          }
+
+    whenIsJust appCheckMissingFiles $ \rInterval ->
+      tell $ HashMap.singleton
+        (JobCtlQueue JobDetectMissingFiles)
+        Cron
+          { cronInitial     = CronAsap
+          , cronRepeat      = CronRepeatScheduled CronAsap
+          , cronRateLimit   = rInterval
+          , cronNotAfter    = Right CronNotScheduled
+          }
+
+    let newyear = cronCalendarAny
+          { cronDayOfYear  = cronMatchOne 1
+          }
+     in tell $ HashMap.singleton
+          (JobCtlQueue JobTruncateTransactionLog)
+          Cron
+            { cronInitial = newyear
+            , cronRepeat = CronRepeatScheduled newyear
+            , cronRateLimit = minNominalYear
+            , cronNotAfter = Right CronNotScheduled
+            }
+
+    oldestLogEntry <- fmap listToMaybe . lift . E.select . E.from $ \transactionLog -> do
+      E.where_ . E.not_ . E.isNothing $ transactionLog E.^. TransactionLogRemote
+      E.orderBy [E.asc $ transactionLog E.^. TransactionLogTime]
+      E.limit 1
+      return $ transactionLog E.^. TransactionLogTime
+    for_ oldestLogEntry $ \(E.Value oldestEntry) ->
+      tell $ HashMap.singleton
+        (JobCtlQueue JobDeleteTransactionLogIPs)
+        Cron
+          { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appTransactionLogIPRetentionTime oldestEntry
+          , cronRepeat    = CronRepeatOnChange
+          , cronRateLimit = nominalDay
+          , cronNotAfter  = Right CronNotScheduled
+          }
+
+    let
+      getNextIntervals within interval cInterval = do
+        now <- liftIO getPOSIXTime
+        return $ do
+          let
+            epochInterval = within / 2
+            (currEpoch, epochNow) = now `divMod'` epochInterval
+            currInterval = epochNow `div'` interval
+            numIntervals = max 1 . floor $ epochInterval / interval
+            n = ceiling $ 4 * cInterval / interval
+          i <- [ negate (ceiling $ n % 2) .. ceiling $ n % 2 ]
+          let
+            ((+ currEpoch) -> nextEpoch, nextInterval) = (currInterval + i) `divMod` numIntervals
+            nextIntervalTime
+              = posixSecondsToUTCTime $ fromInteger nextEpoch * epochInterval + fromInteger nextInterval * interval
+          return (nextEpoch, nextInterval, nextIntervalTime, numIntervals)
+
+    if
+      | is _Just appLdapConf
+      , Just syncWithin <- appSynchroniseLdapUsersWithin
+      , Just cInterval <- appJobCronInterval
+        -> do
+          nextIntervals <- getNextIntervals syncWithin appSynchroniseLdapUsersInterval cInterval
+
+          forM_ nextIntervals $ \(nextEpoch, nextInterval, nextIntervalTime, numIntervals) -> do
             tell $ HashMap.singleton
-              (JobCtlQueue $ JobQueueNotification NotificationExamResult{..})
+              (JobCtlQueue JobSynchroniseLdap
+                 { jEpoch         = fromInteger nextEpoch
+                 , jNumIterations = fromInteger numIntervals
+                 , jIteration     = fromInteger nextInterval
+                 })
               Cron
-                { cronInitial = CronTimestamp . utcToLocalTimeTZ appTZ $ max visibleFrom ts
-                , cronRepeat = CronRepeatOnChange
+                { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ nextIntervalTime
+                , cronRepeat    = CronRepeatNever
+                , cronRateLimit = appSynchroniseLdapUsersInterval
+                , cronNotAfter  = Left syncWithin
+                }
+      | otherwise
+       -> return ()
+
+    whenIsJust ((,) <$> appPruneUnreferencedFilesWithin <*> appJobCronInterval) $ \(within, cInterval) -> do
+      nextIntervals <- getNextIntervals within appPruneUnreferencedFilesInterval cInterval
+      forM_ nextIntervals $ \(nextEpoch, nextInterval, nextIntervalTime, numIntervals) -> do
+        tell $ HashMap.singleton
+          (JobCtlQueue JobPruneUnreferencedFiles
+             { jEpoch         = fromInteger nextEpoch
+             , jNumIterations = fromInteger numIntervals
+             , jIteration     = fromInteger nextInterval
+             }
+          )
+          Cron
+            { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ nextIntervalTime
+            , cronRepeat    = CronRepeatNever
+            , cronRateLimit = appPruneUnreferencedFilesInterval
+            , cronNotAfter  = Left within
+            }
+
+    whenIsJust ((,) <$> appStudyFeaturesRecacheRelevanceWithin <*> appJobCronInterval) $ \(within, cInterval) -> do
+      nextIntervals <- getNextIntervals within appStudyFeaturesRecacheRelevanceInterval cInterval
+      forM_ nextIntervals $ \(nextEpoch, nextInterval, nextIntervalTime, numIntervals) -> do
+        tell $ HashMap.singleton
+          (JobCtlQueue JobStudyFeaturesRecacheRelevance
+             { jEpoch         = fromInteger nextEpoch
+             , jNumIterations = fromInteger numIntervals
+             , jIteration     = fromInteger nextInterval
+             }
+          )
+          Cron
+            { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ nextIntervalTime
+            , cronRepeat    = CronRepeatNever
+            , cronRateLimit = appStudyFeaturesRecacheRelevanceInterval
+            , cronNotAfter  = Left within
+            }
+
+    let
+      sheetJobs (Entity nSheet Sheet{..}) = do
+        for_ (max <$> sheetVisibleFrom <*> sheetActiveFrom) $ \aFrom ->
+          tell $ HashMap.singleton
+            (JobCtlQueue $ JobQueueNotification NotificationSheetActive{..})
+            Cron
+              { cronInitial = CronTimestamp $ utcToLocalTimeTZ appTZ aFrom
+              , cronRepeat = CronRepeatNever
+              , cronRateLimit = appNotificationRateLimit
+              , cronNotAfter = maybe (Left appNotificationExpiration) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) sheetActiveTo
+              }
+        for_ (max <$> sheetVisibleFrom <*> sheetHintFrom) $ \hFrom -> maybeT (return ()) $ do
+          guard $ maybe True (\aFrom -> abs (diffUTCTime aFrom hFrom) > 300) sheetActiveFrom
+          guardM $ or2M (return $ maybe True (\sFrom -> abs (diffUTCTime sFrom hFrom) > 300) sheetSolutionFrom)
+                        (fmap not . lift . lift $ exists [SheetFileType ==. SheetSolution, SheetFileSheet ==. nSheet])
+          guardM . lift . lift $ exists [SheetFileType ==. SheetHint, SheetFileSheet ==. nSheet]
+          tell $ HashMap.singleton
+            (JobCtlQueue $ JobQueueNotification NotificationSheetHint{..})
+            Cron
+              { cronInitial = CronTimestamp $ utcToLocalTimeTZ appTZ hFrom
+              , cronRepeat = CronRepeatNever
+              , cronRateLimit = appNotificationRateLimit
+              , cronNotAfter = maybe (Left appNotificationExpiration) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) sheetActiveTo
+              }
+        for_ (max <$> sheetVisibleFrom <*> sheetSolutionFrom) $ \sFrom -> maybeT (return ()) $ do
+          guard $ maybe True (\aFrom -> abs (diffUTCTime aFrom sFrom) > 300) sheetActiveFrom
+          guardM . lift . lift $ exists [SheetFileType ==. SheetSolution, SheetFileSheet ==. nSheet]
+          tell $ HashMap.singleton
+            (JobCtlQueue $ JobQueueNotification NotificationSheetSolution{..})
+            Cron
+              { cronInitial = CronTimestamp $ utcToLocalTimeTZ appTZ sFrom
+              , cronRepeat = CronRepeatNever
+              , cronRateLimit = appNotificationRateLimit
+              , cronNotAfter = Left nominalDay
+              }
+        for_ sheetActiveTo $ \aTo -> do
+          whenIsJust (max aTo <$> sheetVisibleFrom) $ \aTo' -> do
+            tell $ HashMap.singleton
+              (JobCtlQueue $ JobQueueNotification NotificationSheetSoonInactive{..})
+              Cron
+                { cronInitial = CronTimestamp . utcToLocalTimeTZ appTZ . maybe id max sheetActiveFrom $ addUTCTime (-nominalDay) aTo'
+                , cronRepeat = CronRepeatOnChange -- Allow repetition of the notification (if something changes), but wait at least an hour
                 , cronRateLimit = appNotificationRateLimit
-                , cronNotAfter = Right . CronTimestamp . utcToLocalTimeTZ appTZ . addUTCTime appNotificationExpiration $ max visibleFrom ts
+                , cronNotAfter = Right . CronTimestamp $ utcToLocalTimeTZ appTZ aTo
+                }
+            tell $ HashMap.singleton
+              (JobCtlQueue $ JobQueueNotification NotificationSheetInactive{..})
+              Cron
+                { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ aTo
+                , cronRepeat    = CronRepeatOnChange
+                , cronRateLimit = appNotificationRateLimit
+                , cronNotAfter  = Left appNotificationExpiration
+                }
+          when sheetAutoDistribute $
+            tell $ HashMap.singleton
+              (JobCtlQueue $ JobDistributeCorrections nSheet)
+              Cron
+                { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ aTo
+                , cronRepeat    = CronRepeatNever
+                , cronRateLimit = 3600 -- Irrelevant due to `cronRepeat`
+                , cronNotAfter  = Left nominalDay
+                }
+
+    runConduit $ transPipe lift (selectSource [] []) .| C.mapM_ sheetJobs
+
+    let
+      correctorNotifications :: Map (UserId, SheetId) (Max UTCTime) -> WriterT (Crontab JobCtl) DB ()
+      correctorNotifications = (tell .) . Map.foldMapWithKey $ \(nUser, nSheet) (Max time) -> HashMap.singleton
+        (JobCtlQueue $ JobQueueNotification NotificationCorrectionsAssigned { nUser, nSheet } )
+        Cron
+          { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appNotificationCollateDelay time
+          , cronRepeat    = CronRepeatNever
+          , cronRateLimit = appNotificationRateLimit
+          , cronNotAfter  = Left appNotificationExpiration
+          }
+
+      submissionsByCorrector :: Entity Submission -> Map (UserId, SheetId) (Max UTCTime)
+      submissionsByCorrector (Entity _ sub)
+        | Just ratingBy <- submissionRatingBy sub
+        , Just assigned <- submissionRatingAssigned sub
+        , not $ submissionRatingDone sub
+        = Map.singleton (ratingBy, submissionSheet sub) $ Max assigned
+        | otherwise
+        = Map.empty
+
+      collateSubmissionsByCorrector acc entity = Map.unionWith (<>) acc $ submissionsByCorrector entity
+    correctorNotifications <=< runConduit $
+         transPipe lift ( selectSource [ SubmissionRatingBy !=. Nothing, SubmissionRatingAssigned !=. Nothing ] []
+                        )
+      .| C.fold collateSubmissionsByCorrector Map.empty
+
+
+    let
+      examSelect = E.selectSource . E.from $ \(exam `E.InnerJoin` course `E.InnerJoin` school) -> do
+        E.on $ school E.^. SchoolId E.==. course E.^. CourseSchool
+        E.on $ course E.^. CourseId E.==. exam E.^. ExamCourse
+        return (exam, course, school)
+      examJobs (Entity nExam Exam{..}, _, Entity _ School{..}) = do
+        newestResult <- lift . E.select . E.from $ \examResult -> do
+          E.where_ $ examResult E.^. ExamResultExam E.==. E.val nExam
+          return . E.max_ $ examResult E.^. ExamResultLastChanged
+
+        whenIsJust examVisibleFrom $ \visibleFrom -> do
+          case over (mapped . _Value) ((max `on` NTop) examFinished) newestResult of
+            [E.Value (NTop (Just ts))] ->
+              tell $ HashMap.singleton
+                (JobCtlQueue $ JobQueueNotification NotificationExamResult{..})
+                Cron
+                  { cronInitial = CronTimestamp . utcToLocalTimeTZ appTZ $ max visibleFrom ts
+                  , cronRepeat = CronRepeatOnChange
+                  , cronRateLimit = appNotificationRateLimit
+                  , cronNotAfter = Right . CronTimestamp . utcToLocalTimeTZ appTZ . addUTCTime appNotificationExpiration $ max visibleFrom ts
+                  }
+            _other -> return ()
+
+          whenIsJust examRegisterFrom $ \registerFrom ->
+            tell $ HashMap.singleton
+              (JobCtlQueue $ JobQueueNotification NotificationExamRegistrationActive{..})
+              Cron
+                { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ max visibleFrom registerFrom
+                , cronRepeat    = CronRepeatOnChange
+                , cronRateLimit = appNotificationRateLimit
+                , cronNotAfter  = maybe (Left appNotificationExpiration) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) examRegisterTo
+                }
+          whenIsJust ((,) <$> examRegisterFrom <*> examRegisterTo) $ \(registerFrom, registerTo) ->
+            tell $ HashMap.singleton
+              (JobCtlQueue $ JobQueueNotification NotificationExamRegistrationSoonInactive{..})
+              Cron
+                { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ . max visibleFrom . max registerFrom $ addUTCTime (-nominalDay) registerTo
+                , cronRepeat    = CronRepeatOnChange
+                , cronRateLimit = appNotificationRateLimit
+                , cronNotAfter  = Right . CronTimestamp $ utcToLocalTimeTZ appTZ registerTo
+                }
+          whenIsJust ((,) <$> examRegisterFrom <*> examDeregisterUntil) $ \(registerFrom, deregisterUntil) ->
+            tell $ HashMap.singleton
+              (JobCtlQueue $ JobQueueNotification NotificationExamDeregistrationSoonInactive{..})
+              Cron
+                { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ . max visibleFrom . max registerFrom $ addUTCTime (-nominalDay) deregisterUntil
+                , cronRepeat    = CronRepeatOnChange
+                , cronRateLimit = appNotificationRateLimit
+                , cronNotAfter  = Right . CronTimestamp $ utcToLocalTimeTZ appTZ deregisterUntil
+                }
+
+        let closeTime = case (examClosed, examFinished) of
+              (mClose, Just finish)
+                | isn't _ExamCloseSeparate schoolExamCloseMode -> Just $ maybe id min mClose finish
+              (Just close, _)
+                | is _ExamCloseSeparate schoolExamCloseMode -> Just close
+              _other -> Nothing
+
+        case closeTime of
+          Just close -> do
+            -- If an exam that was previously under `ExamCloseSeparate` rules transitions to `ExamCloseOnFinish`, it might suddenly have been closed an arbitrary time ago
+            -- If `cronNotAfter` was only `appNotificationExpiration` in that case, no notification might ever be sent
+            -- That's probably fine.
+
+            changedResults <- lift . E.select . E.from $ \examResult -> do
+              E.where_ $ examResult E.^. ExamResultExam E.==. E.val nExam
+                   E.&&. examResult E.^. ExamResultLastChanged E.>. E.val close
+              return $ examResult E.^. ExamResultId
+
+            case newestResult of
+              [E.Value (Just lastChange)]
+                | not $ null changedResults
+                  -> tell $ HashMap.singleton
+                       (JobCtlQueue $ JobQueueNotification NotificationExamOfficeExamResultsChanged{ nExamResults = Set.fromList $ map E.unValue changedResults })
+                       Cron
+                         { cronInitial = CronTimestamp  . utcToLocalTimeTZ appTZ $ addUTCTime appNotificationCollateDelay lastChange
+                         , cronRepeat = CronRepeatNever
+                         , cronRateLimit = appNotificationRateLimit
+                         , cronNotAfter = Left appNotificationExpiration
+                         }
+              _other -> return ()
+
+            tell $ HashMap.singleton
+              (JobCtlQueue $ JobQueueNotification NotificationExamOfficeExamResults{..})
+              Cron
+                { cronInitial = CronTimestamp $ utcToLocalTimeTZ appTZ close
+                , cronRepeat = CronRepeatNever
+                , cronRateLimit = appNotificationRateLimit
+                , cronNotAfter = Left appNotificationExpiration
+                }
+          Nothing -> return ()
+     in runConduit $ transPipe lift examSelect .| C.mapM_ examJobs
+
+
+    let
+      externalExamJobs nExternalExam = do
+        newestResult <- lift . E.select . E.from $ \externalExamResult -> do
+          E.where_ $ externalExamResult E.^. ExternalExamResultExam E.==. E.val nExternalExam
+          return . E.max_ $ externalExamResult E.^. ExternalExamResultLastChanged
+
+        case newestResult of
+          [E.Value (Just lastChange)] ->
+            tell $ HashMap.singleton
+              (JobCtlQueue $ JobQueueNotification NotificationExamOfficeExternalExamResults{..})
+              Cron
+                { cronInitial = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appNotificationCollateDelay lastChange
+                , cronRepeat = CronRepeatOnChange
+                , cronRateLimit = nominalDay
+                , cronNotAfter = Left appNotificationExpiration
                 }
           _other -> return ()
 
-        whenIsJust examRegisterFrom $ \registerFrom ->
-          tell $ HashMap.singleton
-            (JobCtlQueue $ JobQueueNotification NotificationExamRegistrationActive{..})
-            Cron
-              { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ max visibleFrom registerFrom
-              , cronRepeat    = CronRepeatOnChange
-              , cronRateLimit = appNotificationRateLimit
-              , cronNotAfter  = maybe (Left appNotificationExpiration) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) examRegisterTo
-              }
-        whenIsJust ((,) <$> examRegisterFrom <*> examRegisterTo) $ \(registerFrom, registerTo) ->
-          tell $ HashMap.singleton
-            (JobCtlQueue $ JobQueueNotification NotificationExamRegistrationSoonInactive{..})
-            Cron
-              { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ . max visibleFrom . max registerFrom $ addUTCTime (-nominalDay) registerTo
-              , cronRepeat    = CronRepeatOnChange
-              , cronRateLimit = appNotificationRateLimit
-              , cronNotAfter  = Right . CronTimestamp $ utcToLocalTimeTZ appTZ registerTo
-              }
-        whenIsJust ((,) <$> examRegisterFrom <*> examDeregisterUntil) $ \(registerFrom, deregisterUntil) ->
-          tell $ HashMap.singleton
-            (JobCtlQueue $ JobQueueNotification NotificationExamDeregistrationSoonInactive{..})
-            Cron
-              { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ . max visibleFrom . max registerFrom $ addUTCTime (-nominalDay) deregisterUntil
-              , cronRepeat    = CronRepeatOnChange
-              , cronRateLimit = appNotificationRateLimit
-              , cronNotAfter  = Right . CronTimestamp $ utcToLocalTimeTZ appTZ deregisterUntil
-              }
-
-      let closeTime = case (examClosed, examFinished) of
-            (mClose, Just finish)
-              | isn't _ExamCloseSeparate schoolExamCloseMode -> Just $ maybe id min mClose finish
-            (Just close, _)
-              | is _ExamCloseSeparate schoolExamCloseMode -> Just close
-            _other -> Nothing
-
-      case closeTime of
-        Just close -> do
-          -- If an exam that was previously under `ExamCloseSeparate` rules transitions to `ExamCloseOnFinish`, it might suddenly have been closed an arbitrary time ago
-          -- If `cronNotAfter` was only `appNotificationExpiration` in that case, no notification might ever be sent
-          -- That's probably fine.
-
-          changedResults <- lift . E.select . E.from $ \examResult -> do
-            E.where_ $ examResult E.^. ExamResultExam E.==. E.val nExam
-                 E.&&. examResult E.^. ExamResultLastChanged E.>. E.val close
-            return $ examResult E.^. ExamResultId
-
-          case newestResult of
-            [E.Value (Just lastChange)]
-              | not $ null changedResults
-                -> tell $ HashMap.singleton
-                     (JobCtlQueue $ JobQueueNotification NotificationExamOfficeExamResultsChanged{ nExamResults = Set.fromList $ map E.unValue changedResults })
-                     Cron
-                       { cronInitial = CronTimestamp  . utcToLocalTimeTZ appTZ $ addUTCTime appNotificationCollateDelay lastChange
-                       , cronRepeat = CronRepeatNever
-                       , cronRateLimit = appNotificationRateLimit
-                       , cronNotAfter = Left appNotificationExpiration
-                       }
-            _other -> return ()
-
-          tell $ HashMap.singleton
-            (JobCtlQueue $ JobQueueNotification NotificationExamOfficeExamResults{..})
-            Cron
-              { cronInitial = CronTimestamp $ utcToLocalTimeTZ appTZ close
-              , cronRepeat = CronRepeatNever
-              , cronRateLimit = appNotificationRateLimit
-              , cronNotAfter = Left appNotificationExpiration
-              }
-        Nothing -> return ()
-   in runConduit $ transPipe lift examSelect .| C.mapM_ examJobs
+    runConduit $ transPipe lift (selectKeys [] []) .| C.mapM_ externalExamJobs
 
 
-  let
-    externalExamJobs nExternalExam = do
-      newestResult <- lift . E.select . E.from $ \externalExamResult -> do
-        E.where_ $ externalExamResult E.^. ExternalExamResultExam E.==. E.val nExternalExam
-        return . E.max_ $ externalExamResult E.^. ExternalExamResultLastChanged
+    allocations <- lift $ selectList [] []
 
-      case newestResult of
-        [E.Value (Just lastChange)] ->
-          tell $ HashMap.singleton
-            (JobCtlQueue $ JobQueueNotification NotificationExamOfficeExternalExamResults{..})
-            Cron
-              { cronInitial = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appNotificationCollateDelay lastChange
-              , cronRepeat = CronRepeatOnChange
-              , cronRateLimit = nominalDay
-              , cronNotAfter = Left appNotificationExpiration
-              }
-        _other -> return ()
+    let
+      allocationTimes :: EntityField Allocation (Maybe UTCTime) -> MergeHashMap UTCTime [Entity Allocation]
+      allocationTimes aField = flip foldMap allocations $ \allocEnt -> case allocEnt ^. fieldLens aField of
+        Nothing -> mempty
+        Just t  -> _MergeHashMap # HashMap.singleton t (pure allocEnt)
 
-  runConduit $ transPipe lift (selectKeys [] []) .| C.mapM_ externalExamJobs
+    forM_ allocations $ \(Entity nAllocation _) -> do
+      doneSince <- lift $ fmap (E.unValue <=< listToMaybe) . E.select . E.from $ \participant -> do
+        E.where_ $ participant E.^. CourseParticipantAllocated E.==. E.just (E.val nAllocation)
+        return . E.max_ $ participant E.^. CourseParticipantRegistration
 
+      whenIsJust doneSince $ \doneSince' ->
+        tell $ HashMap.singleton
+          (JobCtlQueue $ JobQueueNotification NotificationAllocationResults{..})
+          Cron
+            { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appNotificationCollateDelay doneSince'
+            , cronRepeat    = CronRepeatOnChange
+            , cronRateLimit = appNotificationRateLimit
+            , cronNotAfter  = Right . CronTimestamp . utcToLocalTimeTZ appTZ . addUTCTime appNotificationCollateDelay $ addUTCTime appNotificationExpiration doneSince'
+            }
 
-  allocations <- lift $ selectList [] []
-
-  let
-    allocationTimes :: EntityField Allocation (Maybe UTCTime) -> MergeHashMap UTCTime [Entity Allocation]
-    allocationTimes aField = flip foldMap allocations $ \allocEnt -> case allocEnt ^. fieldLens aField of
-      Nothing -> mempty
-      Just t  -> _MergeHashMap # HashMap.singleton t (pure allocEnt)
-
-  forM_ allocations $ \(Entity nAllocation _) -> do
-    doneSince <- lift $ fmap (E.unValue <=< listToMaybe) . E.select . E.from $ \participant -> do
-      E.where_ $ participant E.^. CourseParticipantAllocated E.==. E.just (E.val nAllocation)
-      return . E.max_ $ participant E.^. CourseParticipantRegistration
-
-    whenIsJust doneSince $ \doneSince' ->
+    iforM_ (allocationTimes AllocationStaffRegisterFrom) $ \staffRegisterFrom allocs ->
       tell $ HashMap.singleton
-        (JobCtlQueue $ JobQueueNotification NotificationAllocationResults{..})
+        (JobCtlQueue $ JobQueueNotification NotificationAllocationStaffRegister{ nAllocations = setOf (folded . _entityKey) allocs })
         Cron
-          { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appNotificationCollateDelay doneSince'
+          { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ staffRegisterFrom
           , cronRepeat    = CronRepeatOnChange
           , cronRateLimit = appNotificationRateLimit
-          , cronNotAfter  = Right . CronTimestamp . utcToLocalTimeTZ appTZ . addUTCTime appNotificationCollateDelay $ addUTCTime appNotificationExpiration doneSince'
+          , cronNotAfter  = maybe (Right CronNotScheduled) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) $ nBot =<< minimumOf (folded . _entityVal . _allocationStaffRegisterTo . to NTop . filtered (> NTop (Just staffRegisterFrom))) allocs
+          }
+    iforM_ (allocationTimes AllocationRegisterFrom) $ \registerFrom allocs ->
+      tell $ HashMap.singleton
+        (JobCtlQueue $ JobQueueNotification NotificationAllocationRegister{ nAllocations = setOf (folded . _entityKey) allocs })
+        Cron
+          { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ registerFrom
+          , cronRepeat    = CronRepeatOnChange
+          , cronRateLimit = appNotificationRateLimit
+          , cronNotAfter  = maybe (Right CronNotScheduled) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) $ nBot =<< minimumOf (folded . _entityVal . _allocationRegisterTo . to NTop . filtered (> NTop (Just registerFrom))) allocs
+          }
+    iforM_ (allocationTimes AllocationStaffAllocationFrom) $ \staffAllocationFrom allocs ->
+      tell $ HashMap.singleton
+        (JobCtlQueue $ JobQueueNotification NotificationAllocationAllocation{ nAllocations = setOf (folded . _entityKey) allocs })
+        Cron
+          { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ staffAllocationFrom
+          , cronRepeat    = CronRepeatOnChange
+          , cronRateLimit = appNotificationRateLimit
+          , cronNotAfter  = maybe (Right CronNotScheduled) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) $ nBot =<< minimumOf (folded . _entityVal . _allocationStaffAllocationTo . to NTop . filtered (> NTop (Just staffAllocationFrom))) allocs
+          }
+    iforM_ (allocationTimes AllocationRegisterTo) $ \registerTo allocs' -> do
+      let allocs = flip filter allocs' $ \(Entity _ Allocation{..}) -> maybe True (> registerTo) allocationStaffAllocationTo
+      tell $ HashMap.singleton
+        (JobCtlQueue $ JobQueueNotification NotificationAllocationUnratedApplications{ nAllocations = setOf (folded . _entityKey) allocs })
+        Cron
+          { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ registerTo
+          , cronRepeat    = CronRepeatOnChange
+          , cronRateLimit = appNotificationRateLimit
+          , cronNotAfter  = maybe (Right CronNotScheduled) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) $ nBot =<< minimumOf (folded . _entityVal . _allocationStaffAllocationTo . to NTop . filtered (> NTop (Just registerTo))) allocs
           }
 
 
-  let externalApiJobs (Entity jExternalApi ExternalApi{..}) =
-        tell $ HashMap.singleton
-          (JobCtlQueue JobExternalApiExpire{..})
-          Cron
-            { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appExternalApisExpiry externalApiLastAlive
-            , cronRepeat    = CronRepeatOnChange
-            , cronRateLimit = appExternalApisExpiry
-            , cronNotAfter  = Right CronNotScheduled
-            }
-
-  runConduit $ transPipe lift (selectSource [] []) .| C.mapM_ externalApiJobs
+    hasRelevanceUncached <- lift $ exists [StudyFeaturesRelevanceCached ==. Nothing]
+    when hasRelevanceUncached . tell $ HashMap.singleton
+      (JobCtlQueue JobStudyFeaturesCacheRelevance)
+      Cron
+        { cronInitial   = CronAsap
+        , cronRepeat    = CronRepeatOnChange
+        , cronRateLimit = nominalDay
+        , cronNotAfter  = Right CronNotScheduled
+        }
 
 
-  iforM_ (allocationTimes AllocationStaffRegisterFrom) $ \staffRegisterFrom allocs ->
-    tell $ HashMap.singleton
-      (JobCtlQueue $ JobQueueNotification NotificationAllocationStaffRegister{ nAllocations = setOf (folded . _entityKey) allocs })
-      Cron
-        { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ staffRegisterFrom
-        , cronRepeat    = CronRepeatOnChange
-        , cronRateLimit = appNotificationRateLimit
-        , cronNotAfter  = maybe (Right CronNotScheduled) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) $ nBot =<< minimumOf (folded . _entityVal . _allocationStaffRegisterTo . to NTop . filtered (> NTop (Just staffRegisterFrom))) allocs
-        }
-  iforM_ (allocationTimes AllocationRegisterFrom) $ \registerFrom allocs ->
-    tell $ HashMap.singleton
-      (JobCtlQueue $ JobQueueNotification NotificationAllocationRegister{ nAllocations = setOf (folded . _entityKey) allocs })
-      Cron
-        { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ registerFrom
-        , cronRepeat    = CronRepeatOnChange
-        , cronRateLimit = appNotificationRateLimit
-        , cronNotAfter  = maybe (Right CronNotScheduled) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) $ nBot =<< minimumOf (folded . _entityVal . _allocationRegisterTo . to NTop . filtered (> NTop (Just registerFrom))) allocs
-        }
-  iforM_ (allocationTimes AllocationStaffAllocationFrom) $ \staffAllocationFrom allocs ->
-    tell $ HashMap.singleton
-      (JobCtlQueue $ JobQueueNotification NotificationAllocationAllocation{ nAllocations = setOf (folded . _entityKey) allocs })
-      Cron
-        { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ staffAllocationFrom
-        , cronRepeat    = CronRepeatOnChange
-        , cronRateLimit = appNotificationRateLimit
-        , cronNotAfter  = maybe (Right CronNotScheduled) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) $ nBot =<< minimumOf (folded . _entityVal . _allocationStaffAllocationTo . to NTop . filtered (> NTop (Just staffAllocationFrom))) allocs
-        }
-  iforM (allocationTimes AllocationRegisterTo) $ \registerTo allocs' -> do
-    let allocs = flip filter allocs' $ \(Entity _ Allocation{..}) -> maybe True (> registerTo) allocationStaffAllocationTo
-    tell $ HashMap.singleton
-      (JobCtlQueue $ JobQueueNotification NotificationAllocationUnratedApplications{ nAllocations = setOf (folded . _entityKey) allocs })
-      Cron
-        { cronInitial   = CronTimestamp $ utcToLocalTimeTZ appTZ registerTo
-        , cronRepeat    = CronRepeatOnChange
-        , cronRateLimit = appNotificationRateLimit
-        , cronNotAfter  = maybe (Right CronNotScheduled) (Right . CronTimestamp . utcToLocalTimeTZ appTZ) $ nBot =<< minimumOf (folded . _entityVal . _allocationStaffAllocationTo . to NTop . filtered (> NTop (Just registerTo))) allocs
-        }
+    let externalApiJobs (Entity jExternalApi ExternalApi{..}) =
+          tell $ HashMap.singleton
+            (JobCtlQueue JobExternalApiExpire{..})
+            Cron
+              { cronInitial   = CronTimestamp . utcToLocalTimeTZ appTZ $ addUTCTime appExternalApisExpiry externalApiLastAlive
+              , cronRepeat    = CronRepeatOnChange
+              , cronRateLimit = appExternalApisExpiry
+              , cronNotAfter  = Right CronNotScheduled
+              }
+
+    runConduit $ transPipe lift (selectSource [] []) .| C.mapM_ externalApiJobs
diff --git a/src/Jobs/Handler/Files.hs b/src/Jobs/Handler/Files.hs
index e100c571d..0415a1083 100644
--- a/src/Jobs/Handler/Files.hs
+++ b/src/Jobs/Handler/Files.hs
@@ -23,14 +23,8 @@ import qualified Network.Minio as Minio
 
 import Crypto.Hash (hashDigestSize, digestFromByteString)
 
-import Data.List ((!!), unfoldr, maximumBy, init, genericLength)
-import qualified Data.ByteString as ByteString
-import Data.Bits (Bits(shiftR))
-
 import qualified Data.Map.Strict as Map
 
-import Control.Monad.Random.Lazy (evalRand, mkStdGen)
-import System.Random.Shuffle (shuffleM)
 import System.IO.Unsafe
 
 import Handler.Utils.Files (sourceFileDB)
@@ -44,6 +38,8 @@ import qualified Data.Sequence as Seq
 
 import Jobs.Queue (YesodJobDB)
 
+import Jobs.Handler.Intervals.Utils
+
 
 dispatchJobPruneSessionFiles :: JobHandler UniWorX
 dispatchJobPruneSessionFiles = JobHandlerAtomicWithFinalizer act fin
@@ -73,9 +69,7 @@ fileReferences (E.just -> fHash)
     ]
 
 workflowFileReferences :: MonadResource m => ConduitT () FileContentReference (SqlPersistT m) ()
-workflowFileReferences = mconcat [ E.selectSource (E.from $ pure . (E.^. WorkflowDefinitionGraph)) .| awaitForever (mapMOf_ (typesCustom @WorkflowChildren . _fileReferenceContent . _Just) yield . E.unValue)
-                                 , E.selectSource (E.from $ pure . (E.^. WorkflowInstanceGraph  )) .| awaitForever (mapMOf_ (typesCustom @WorkflowChildren . _fileReferenceContent . _Just) yield . E.unValue)
-                                 , E.selectSource (E.from $ pure . (E.^. WorkflowWorkflowGraph  )) .| awaitForever (mapMOf_ (typesCustom @WorkflowChildren . _fileReferenceContent . _Just) yield . E.unValue)
+workflowFileReferences = mconcat [ E.selectSource (E.from $ pure . (E.^. SharedWorkflowGraphGraph)) .| awaitForever (mapMOf_ (typesCustom @WorkflowChildren . _fileReferenceContent . _Just) yield . E.unValue)
                                  , E.selectSource (E.from $ pure . (E.^. WorkflowWorkflowState  )) .| awaitForever (mapMOf_ (typesCustom @WorkflowChildren . _fileReferenceContent . _Just) yield . E.unValue)
                                  ]
 
@@ -161,52 +155,10 @@ dispatchJobPruneUnreferencedFiles numIterations epoch iteration = JobHandlerAtom
                          ( Unwrapped FileContentChunkReference ~ Digest h )
                       => Integer
         chunkHashBytes = fromIntegral (hashDigestSize (error "hashDigestSize inspected argument" :: h))
-        chunkHashBits = chunkHashBytes * 8
-        base :: Integer
-        base = 2 ^ chunkHashBits
-        intervals :: [Integer]
-        -- | Exclusive upper bounds
-        intervals
-          | numIterations <= 0 = pure base
-          | otherwise = go protoIntervals ^.. folded . _1
-          where
-            go [] = []
-            go ints
-              | maximumOf (folded . _1) ints == Just base = ints
-              | otherwise = go $ lts ++ over _1 succ (over _2 (subtract $ toInteger numIterations) closest) : map (over _1 succ) gts
-              where
-                closest = maximumBy (comparing $ view _2) ints
-                (lts, geqs) = partition (((>) `on` view _1) closest) ints
-                gts = filter (((<) `on` view _1) closest) geqs
-            -- | Exclusive upper bounds
-            protoIntervals :: [(Integer, Integer)]
-            protoIntervals = [ over _1 (i *) $ base `divMod` toInteger numIterations
-                             | i <- [1 .. toInteger numIterations]
-                             ]
 
-        intervalsDgsts' = zipWith (curry . over both $ toDigest <=< assertM' (> 0)) (0 : init intervals) intervals 
-
-        toDigest :: Integer -> Maybe FileContentChunkReference
-        toDigest = fmap (review _Wrapped) . digestFromByteString . pad . ByteString.pack . reverse . unfoldr step
-          where step i
-                  | i <= 0 = Nothing
-                  | otherwise = Just (fromIntegral i, i `shiftR` 8)
-                pad bs
-                  | toInteger (ByteString.length bs) >= chunkHashBytes = bs
-                  | otherwise = pad $ ByteString.cons 0 bs
-
-      intervalsDgsts <- atomically $ do
-        cachedDgsts <- readTVar pruneUnreferencedFilesIntervalsCache
-        case Map.lookup numIterations cachedDgsts of
-          Just c -> return c
-          Nothing -> do
-            modifyTVar' pruneUnreferencedFilesIntervalsCache $ force . Map.insert numIterations intervalsDgsts'
-            return intervalsDgsts'
+      (minBoundDgst, maxBoundDgst) <- currentIntervalCached pruneUnreferencedFilesIntervalsCache chunkHashBytes (fmap (review _Wrapped) . digestFromByteString) numIterations epoch iteration
 
       let
-        permIntervalsDgsts = shuffleM intervalsDgsts `evalRand` mkStdGen (hash epoch)
-
-        (minBoundDgst, maxBoundDgst) = permIntervalsDgsts !! fromIntegral (toInteger iteration `mod` genericLength permIntervalsDgsts)
         chunkIdFilter :: E.SqlExpr (E.Value FileContentChunkReference) -> E.SqlExpr (E.Value Bool)
         chunkIdFilter cRef = E.and $ catMaybes
           [ minBoundDgst <&> \b -> cRef E.>=. E.val b
diff --git a/src/Jobs/Handler/Intervals/Utils.hs b/src/Jobs/Handler/Intervals/Utils.hs
new file mode 100644
index 000000000..fb487b062
--- /dev/null
+++ b/src/Jobs/Handler/Intervals/Utils.hs
@@ -0,0 +1,77 @@
+module Jobs.Handler.Intervals.Utils
+  ( mkIntervals, mkIntervalsCached
+  , getCurrentInterval
+  , currentIntervalCached
+  ) where
+
+import Import hiding (init, maximumBy, cached)
+
+import Control.Monad.Random.Lazy (evalRand, mkStdGen)
+import System.Random.Shuffle (shuffleM)
+import Data.List ((!!), unfoldr, maximumBy, init, genericLength)
+import qualified Data.ByteString as ByteString
+import Data.Bits (Bits(shiftR))
+
+import qualified Data.Map.Strict as Map
+  
+
+mkIntervals :: forall a. Integer -> (ByteString -> Maybe a) -> Natural -> [(Maybe a, Maybe a)]
+mkIntervals bytes fromBS numIterations = zip (Nothing : init intervals') intervals'
+  where
+    bits = bytes * 8
+    base :: Integer
+    base = 2 ^ bits
+
+    -- | Exclusive upper bounds
+    intervals
+      | numIterations <= 0 = pure base
+      | otherwise = go protoIntervals ^.. folded . _1
+      where
+        go [] = []
+        go ints
+          | maximumOf (folded . _1) ints == Just base = ints
+          | otherwise = go $ lts ++ over _1 succ (over _2 (subtract $ toInteger numIterations) closest) : map (over _1 succ) gts
+          where
+            closest = maximumBy (comparing $ view _2) ints
+            (lts, geqs) = partition (((>) `on` view _1) closest) ints
+            gts = filter (((<) `on` view _1) closest) geqs
+        -- | Exclusive upper bounds
+        protoIntervals :: [(Integer, Integer)]
+        protoIntervals = [ over _1 (i *) $ base `divMod` toInteger numIterations
+                         | i <- [1 .. toInteger numIterations]
+                         ]
+
+    intervals' = map (fromBS' <=< assertM' (> 0)) intervals
+
+    fromBS' :: Integer -> Maybe a
+    fromBS' = fromBS . pad . ByteString.pack . reverse . unfoldr step
+      where step i
+              | i <= 0 || i >= base = Nothing
+              | otherwise = Just (fromIntegral i, i `shiftR` 8)
+            pad bs
+              | toInteger (ByteString.length bs) >= bytes = bs
+              | otherwise = pad $ ByteString.cons 0 bs
+
+getCurrentInterval :: forall a. Natural -> Natural -> [a] -> a
+getCurrentInterval epoch iteration intervals = permIntervals !! fromIntegral (toInteger iteration `mod` genericLength permIntervals)
+  where permIntervals = shuffleM intervals `evalRand` mkStdGen (hash epoch)
+
+
+mkIntervalsCached :: forall m a. (NFData a, MonadIO m)
+                  => TVar (Map Natural [(Maybe a, Maybe a)])
+                  -> Integer -> (ByteString -> Maybe a) -> Natural -> m [(Maybe a, Maybe a)]
+mkIntervalsCached cacheTVar bytes fromBS numIterations = atomically $ do
+    cached <- readTVar cacheTVar
+    case Map.lookup numIterations cached of
+      Just c -> return c
+      Nothing -> do
+        modifyTVar' cacheTVar $ force . Map.insert numIterations intervals'
+        return intervals'
+  where intervals' = mkIntervals bytes fromBS numIterations
+
+currentIntervalCached :: forall m a. (NFData a, MonadIO m)
+                      => TVar (Map Natural [(Maybe a, Maybe a)])
+                      -> Integer -> (ByteString -> Maybe a)
+                      -> Natural -> Natural -> Natural -> m (Maybe a, Maybe a)
+currentIntervalCached cacheTVar bytes fromBS numIterations epoch iteration
+  = getCurrentInterval epoch iteration <$> mkIntervalsCached cacheTVar bytes fromBS numIterations
diff --git a/src/Jobs/Handler/StudyFeatures.hs b/src/Jobs/Handler/StudyFeatures.hs
new file mode 100644
index 000000000..4ebf56b04
--- /dev/null
+++ b/src/Jobs/Handler/StudyFeatures.hs
@@ -0,0 +1,45 @@
+module Jobs.Handler.StudyFeatures
+  ( dispatchJobStudyFeaturesCacheRelevance
+  , dispatchJobStudyFeaturesRecacheRelevance 
+  ) where
+
+import Import
+
+import Handler.Utils.StudyFeatures
+
+import qualified Database.Esqueleto as E
+import qualified Database.Esqueleto.Utils as E
+
+import qualified Data.Map.Strict as Map
+
+import System.IO.Unsafe
+
+import Jobs.Handler.Intervals.Utils
+
+import qualified Data.UUID as UUID
+  
+
+dispatchJobStudyFeaturesCacheRelevance :: JobHandler UniWorX
+dispatchJobStudyFeaturesCacheRelevance = JobHandlerAtomic $ 
+  cacheStudyFeatureRelevance $ \studyFeatures -> E.isNothing $ studyFeatures E.^. StudyFeaturesRelevanceCached
+
+{-# NOINLINE studyFeaturesRecacheRelevanceIntervalsCache #-}
+studyFeaturesRecacheRelevanceIntervalsCache :: TVar (Map Natural [(Maybe UUID, Maybe UUID)])
+studyFeaturesRecacheRelevanceIntervalsCache = unsafePerformIO $ newTVarIO Map.empty
+
+  
+dispatchJobStudyFeaturesRecacheRelevance :: Natural -> Natural -> Natural -> JobHandler UniWorX
+dispatchJobStudyFeaturesRecacheRelevance numIterations epoch iteration = JobHandlerAtomic $ do
+  (minBoundUUID, maxBoundUUID) <- currentIntervalCached studyFeaturesRecacheRelevanceIntervalsCache 16 (UUID.fromByteString . fromStrict) numIterations epoch iteration
+
+  let
+    uuidFilter :: E.SqlExpr (E.Value (Maybe UUID)) -> E.SqlExpr (E.Value Bool)
+    uuidFilter cRef = E.and $ catMaybes
+      [ pure $ E.isJust cRef
+      , minBoundUUID <&> \b -> cRef E.>=. E.justVal b
+      , maxBoundUUID <&> \b -> cRef E.<.  E.justVal b
+      ]
+
+  $logDebugS "StudyFeaturesRecacheRelevance" . tshow $ (minBoundUUID, maxBoundUUID)
+
+  cacheStudyFeatureRelevance $ \studyFeatures -> uuidFilter $ studyFeatures E.^. StudyFeaturesRelevanceCached
diff --git a/src/Jobs/Offload.hs b/src/Jobs/Offload.hs
new file mode 100644
index 000000000..2991e03f2
--- /dev/null
+++ b/src/Jobs/Offload.hs
@@ -0,0 +1,70 @@
+module Jobs.Offload
+  ( mkJobOffloadHandler
+  ) where
+
+import Import hiding (bracket, js)
+import Jobs.Types
+import Jobs.Queue
+
+import qualified Database.PostgreSQL.Simple as PG
+import qualified Database.PostgreSQL.Simple.Types as PG
+import qualified Database.PostgreSQL.Simple.Notification as PG
+
+import Database.Persist.Postgresql (PostgresConf, pgConnStr)
+
+import Data.Text.Encoding (decodeUtf8')
+
+import UnliftIO.Exception (bracket)
+
+
+jobOffloadChannel :: Text
+jobOffloadChannel = "job-offload"
+
+mkJobOffloadHandler :: forall m.
+                       ( MonadResource m
+                       , MonadUnliftIO m
+                       , MonadThrow m, MonadReader UniWorX m
+                       , MonadLogger m
+                       )
+                    => PostgresConf -> JobMode
+                    -> Maybe (m JobOffloadHandler)
+mkJobOffloadHandler dbConf jMode
+  | is _JobsLocal jMode, hasn't (_jobsAcceptOffload . only True) jMode = Nothing
+  | otherwise = Just $ do
+      jobOffloadOutgoing <- newTVarIO mempty
+      jobOffloadHandler <- allocateAsync . bracket (liftIO . PG.connectPostgreSQL $ pgConnStr dbConf) (liftIO . PG.close) $ \pgConn -> do
+        myPid <- liftIO $ PG.getBackendPID pgConn
+        let shouldListen = has (_jobsAcceptOffload . only True) jMode
+
+        when shouldListen $
+          void . liftIO $ PG.execute pgConn "LISTEN ?" (PG.Only $ PG.Identifier jobOffloadChannel)
+  
+        foreverBreak $ \(($ ()) -> terminate) -> do
+          UniWorX{appJobState} <- ask
+          shouldTerminate <- atomically $ readTMVar appJobState >>= fmap not . isEmptyTMVar . jobShutdown
+          when shouldTerminate terminate
+
+          let
+            getInput = do
+              n@PG.Notification{..} <- liftIO $ PG.getNotification pgConn
+              if | notificationPid == myPid || notificationChannel /= encodeUtf8 jobOffloadChannel -> getInput
+                 | otherwise -> return n
+            getOutput = atomically $ do
+              jQueue <- readTVar jobOffloadOutgoing
+              case jQueue of
+                j :< js -> j <$ writeTVar jobOffloadOutgoing js
+                _other  -> mzero
+
+          io <- lift $ if
+            | shouldListen -> getInput `race` getOutput
+            | otherwise    -> Right <$> getOutput
+
+          case io of
+            Left PG.Notification{..}
+              | Just jId <- fromPathPiece =<< either (const Nothing) Just (decodeUtf8' notificationData)
+                -> writeJobCtl $ JobCtlPerform jId
+              | otherwise
+                -> $logErrorS "JobOffloadHandler" $ "Could not parse incoming notification data: " <> tshow notificationData
+            Right jId -> void . liftIO $ PG.execute pgConn "NOTIFY ?, ?" (PG.Identifier jobOffloadChannel, encodeUtf8 $ toPathPiece jId)
+        
+      return JobOffloadHandler{..}
diff --git a/src/Jobs/Types.hs b/src/Jobs/Types.hs
index c640857c2..7d2341572 100644
--- a/src/Jobs/Types.hs
+++ b/src/Jobs/Types.hs
@@ -9,7 +9,7 @@ module Jobs.Types
   , classifyJobCtl
   , YesodJobDB
   , JobHandler(..), _JobHandlerAtomic, _JobHandlerException
-  , JobContext(..)
+  , JobOffloadHandler(..), JobContext(..)
   , JobState(..), _jobWorkers, _jobWorkerName, _jobContext, _jobPoolManager, _jobCron, _jobShutdown, _jobCurrentCrontab
   , jobWorkerNames
   , JobWorkerState(..), _jobWorkerJobCtl, _jobWorkerJob
@@ -99,6 +99,11 @@ data Job
   | JobRechunkFiles
   | JobDetectMissingFiles
   | JobPruneOldSentMails
+  | JobStudyFeaturesCacheRelevance
+  | JobStudyFeaturesRecacheRelevance { jNumIterations
+                                     , jEpoch
+                                     , jIteration :: Natural
+                                     }
   deriving (Eq, Ord, Show, Read, Generic, Typeable)
 data Notification
   = NotificationSubmissionRated { nSubmission :: SubmissionId }
@@ -240,10 +245,16 @@ showWorkerId = tshow . hashUnique . jobWorkerUnique
 newWorkerId :: MonadIO m => m JobWorkerId
 newWorkerId = JobWorkerId <$> liftIO newUnique
 
+data JobOffloadHandler = JobOffloadHandler
+  { jobOffloadHandler :: Async ()
+  , jobOffloadOutgoing :: TVar (Seq QueuedJobId)
+  }
+
 data JobContext = JobContext
   { jobCrontab :: TVar (Crontab JobCtl)
   , jobConfirm :: TVar (HashMap JobCtl (NonEmpty (TMVar (Maybe SomeException))))
   , jobHeldLocks :: TVar (Set QueuedJobId)
+  , jobOffload :: TMVar JobOffloadHandler
   }
 
 
diff --git a/src/Model/Migration/Definitions.hs b/src/Model/Migration/Definitions.hs
index 8fc1ae10d..2fe78d785 100644
--- a/src/Model/Migration/Definitions.hs
+++ b/src/Model/Migration/Definitions.hs
@@ -47,6 +47,8 @@ import Data.Time.Format
 
 import qualified Data.Time.Zones as TZ
 
+import Utils.Workflow
+
 
 data ManualMigration
   = Migration20180813SimplifyUserTheme
@@ -97,6 +99,8 @@ data ManualMigration
   | Migration20201106StoredMarkup
   | Migration20201119RoomTypes
   | Migration20210115ExamPartsFrom
+  | Migration20210201SharedWorkflowGraphs
+  | Migration20210208StudyFeaturesRelevanceCachedUUIDs
   deriving (Eq, Ord, Read, Show, Enum, Bounded, Generic, Typeable)
   deriving anyclass (Universe, Finite)
 
@@ -135,6 +139,7 @@ migrateManual = do
     , ("file_content_entry_chunk_hash",       "CREATE INDEX file_content_entry_chunk_hash ON \"file_content_entry\" (chunk_hash)"        )
     , ("sent_mail_bounce_secret",             "CREATE INDEX sent_mail_bounce_secret ON \"sent_mail\" (bounce_secret) WHERE bounce_secret IS NOT NULL")
     , ("sent_mail_recipient",                 "CREATE INDEX sent_mail_recipient ON \"sent_mail\" (recipient) WHERE recipient IS NOT NULL")
+    , ("study_features_relevance_cached",     "CREATE INDEX study_features_relevance_cached ON \"study_features\" (relevance_cached)")
     ]
   where
     addIndex :: Text -> Sql -> Migration
@@ -968,6 +973,73 @@ customMigrations = mapF $ \case
           migrateExam _ = return ()
        in runConduit $ getExam .| C.mapM_ migrateExam
 
+  Migration20210201SharedWorkflowGraphs -> do
+    unlessM (tableExists "shared_workflow_graph")
+      [executeQQ|CREATE TABLE "shared_workflow_graph" ("hash" bytea primary key, "graph" jsonb not null)|]
+
+    whenM (tableExists "workflow_definition") $ do
+      [executeQQ|ALTER TABLE "workflow_definition" ADD COLUMN "graph_id" bytea references shared_workflow_graph(hash)|]
+      let getDefinitions = [queryQQ|SELECT "id", "graph" FROM "workflow_definition"|]
+          migrateDefinition [ fromPersistValue -> Right (wdId :: WorkflowDefinitionId), fromPersistValue -> Right (graph :: DBWorkflowGraph) ] = do
+            swgId <- insertSharedWorkflowGraph graph
+            [executeQQ|UPDATE "workflow_definition" SET "graph_id" = #{swgId} WHERE "id" = #{wdId}|]
+          migrateDefinition _ = return ()
+       in runConduit $ getDefinitions .| C.mapM_ migrateDefinition
+
+      [executeQQ|
+        ALTER TABLE "workflow_definition" DROP COLUMN "graph";
+        ALTER TABLE "workflow_definition" ALTER COLUMN "graph_id" SET not null;
+        ALTER TABLE "workflow_definition" RENAME COLUMN "graph_id" TO "graph";
+      |]
+
+    whenM (tableExists "workflow_instance") $ do
+      [executeQQ|ALTER TABLE "workflow_instance" ADD COLUMN "graph_id" bytea references shared_workflow_graph(hash)|]
+      let getInstances = [queryQQ|SELECT "id", "graph" FROM "workflow_instance"|]
+          migrateInstance [ fromPersistValue -> Right (wiId :: WorkflowInstanceId), fromPersistValue -> Right (graph :: DBWorkflowGraph) ] = do
+            swgId <- insertSharedWorkflowGraph graph
+            [executeQQ|UPDATE "workflow_instance" SET "graph_id" = #{swgId} WHERE "id" = #{wiId}|]
+          migrateInstance _ = return ()
+       in runConduit $ getInstances .| C.mapM_ migrateInstance
+
+      [executeQQ|
+        ALTER TABLE "workflow_instance" DROP COLUMN "graph";
+        ALTER TABLE "workflow_instance" ALTER COLUMN "graph_id" SET not null;
+        ALTER TABLE "workflow_instance" RENAME COLUMN "graph_id" TO "graph";
+      |]
+
+    whenM (tableExists "workflow_workflow") $ do
+      [executeQQ|ALTER TABLE "workflow_workflow" ADD COLUMN "graph_id" bytea references shared_workflow_graph(hash)|]
+      let getWorkflows = [queryQQ|SELECT "id", "graph" FROM "workflow_workflow"|]
+          migrateWorkflow [ fromPersistValue -> Right (wwId :: WorkflowWorkflowId), fromPersistValue -> Right (graph :: DBWorkflowGraph) ] = do
+            swgId <- insertSharedWorkflowGraph graph
+            [executeQQ|UPDATE "workflow_workflow" SET "graph_id" = #{swgId} WHERE "id" = #{wwId}|]
+          migrateWorkflow _ = return ()
+       in runConduit $ getWorkflows .| C.mapM_ migrateWorkflow
+
+      [executeQQ|
+        ALTER TABLE "workflow_workflow" DROP COLUMN "graph";
+        ALTER TABLE "workflow_workflow" ALTER COLUMN "graph_id" SET not null;
+        ALTER TABLE "workflow_workflow" RENAME COLUMN "graph_id" TO "graph";
+      |]
+
+  Migration20210208StudyFeaturesRelevanceCachedUUIDs ->
+    whenM (tableExists "study_features") $ do
+      [executeQQ|
+        ALTER TABLE "study_features" ADD COLUMN "relevance_cached_uuid" uuid
+      |]
+
+      let getStudyFeatures = [queryQQ|SELECT "id" FROM "study_features" WHERE relevance_cached|]
+          migrateStudyFeatures genUUID lift' [ fromPersistValue -> Right (sfId :: StudyFeaturesId) ] = do
+            uuid <- genUUID
+            lift' [executeQQ|UPDATE "study_features" SET "relevance_cached_uuid" = #{uuid} WHERE "id" = #{sfId}|]
+          migrateStudyFeatures _ _ _ = return ()
+       in runConduit $ getStudyFeatures .| randUUIDC (\genUUID lift' -> C.mapM_ $ migrateStudyFeatures genUUID lift')
+
+      [executeQQ|
+        ALTER TABLE "study_features" DROP COLUMN "relevance_cached";
+        ALTER TABLE "study_features" RENAME COLUMN "relevance_cached_uuid" TO "relevance_cached";
+      |]
+
 
 tableExists :: MonadIO m => Text -> ReaderT SqlBackend m Bool
 tableExists table = do
diff --git a/src/Model/Types/Exam.hs b/src/Model/Types/Exam.hs
index 76588cb08..1a9cb0ef4 100644
--- a/src/Model/Types/Exam.hs
+++ b/src/Model/Types/Exam.hs
@@ -326,7 +326,10 @@ derivePersistFieldJSON ''ExamGradingRule
 
 newtype ExamPassed = ExamPassed { examPassed :: Bool }
   deriving (Read, Show, Generic, Typeable)
-  deriving newtype (Eq, Ord, Enum, Bounded, PersistField, PersistFieldSql)
+  deriving newtype (Eq, Ord, Enum, Bounded, PersistField)
+
+instance PersistFieldSql ExamPassed where
+  sqlType _ = sqlType $ Proxy @Bool
 
 deriveFinite ''ExamPassed
 finitePathPiece ''ExamPassed ["failed", "passed"]
diff --git a/src/Model/Types/File.hs b/src/Model/Types/File.hs
index 5beb0ef55..be8922eff 100644
--- a/src/Model/Types/File.hs
+++ b/src/Model/Types/File.hs
@@ -19,7 +19,7 @@ module Model.Types.File
 
 import Import.NoModel
    
-import Database.Persist.Sql (PersistFieldSql)
+import Database.Persist.Sql (PersistFieldSql(..))
 import Web.HttpApiData (ToHttpApiData, FromHttpApiData)
 import Data.ByteArray (ByteArrayAccess)
 
@@ -42,24 +42,30 @@ import qualified Data.Map as Map
 
 newtype FileContentChunkReference = FileContentChunkReference (Digest SHA3_512)
   deriving (Eq, Ord, Read, Show, Lift, Generic, Typeable)
-  deriving newtype ( PersistField, PersistFieldSql
+  deriving newtype ( PersistField
                    , PathPiece, ToHttpApiData, FromHttpApiData, ToJSON, FromJSON
                    , Hashable, NFData
                    , ByteArrayAccess
                    , Binary
                    )
 
+instance PersistFieldSql FileContentChunkReference where
+  sqlType _ = sqlType $ Proxy @(Digest SHA3_512)
+
 makeWrapped ''FileContentChunkReference
 
 newtype FileContentReference = FileContentReference (Digest SHA3_512)
   deriving (Eq, Ord, Read, Show, Lift, Generic, Typeable)
-  deriving newtype ( PersistField, PersistFieldSql
+  deriving newtype ( PersistField
                    , PathPiece, ToHttpApiData, FromHttpApiData, ToJSON, FromJSON
                    , Hashable, NFData
                    , ByteArrayAccess
                    , Binary
                    )
 
+instance PersistFieldSql FileContentReference where
+  sqlType _ = sqlType $ Proxy @(Digest SHA3_512)
+
 makeWrapped ''FileContentReference
 
 
diff --git a/src/Model/Types/Mail.hs b/src/Model/Types/Mail.hs
index be993e10b..a6e96ad4f 100644
--- a/src/Model/Types/Mail.hs
+++ b/src/Model/Types/Mail.hs
@@ -19,7 +19,7 @@ import qualified Data.HashSet as HashSet
 import qualified Data.HashMap.Strict as HashMap
 
 import Crypto.Hash (digestFromByteString, SHAKE128)
-import Database.Persist.Sql (PersistFieldSql)
+import Database.Persist.Sql (PersistFieldSql(..))
 
 import Data.ByteArray (ByteArrayAccess)
 import qualified Data.ByteArray as BA
@@ -102,11 +102,14 @@ derivePersistFieldJSON ''NotificationSettings
 
 newtype BounceSecret = BounceSecret (Digest (SHAKE128 64))
   deriving (Eq, Ord, Read, Show, Lift, Generic, Typeable)
-  deriving newtype ( PersistField, PersistFieldSql
+  deriving newtype ( PersistField
                    , Hashable, NFData
                    , ByteArrayAccess
                    )
 
+instance PersistFieldSql BounceSecret where
+  sqlType _ = sqlType $ Proxy @(Digest (SHAKE128 64))
+
 instance PathPiece BounceSecret where
   toPathPiece = CI.foldCase . encodeBase32Unpadded . BA.convert
   fromPathPiece = fmap BounceSecret . digestFromByteString <=< either (const Nothing) Just . decodeBase32Unpadded . encodeUtf8
@@ -120,10 +123,13 @@ derivePersistFieldJSON ''MailContent
 
 newtype MailContentReference = MailContentReference (Digest SHA3_512)
   deriving (Eq, Ord, Read, Show, Lift, Generic, Typeable)
-  deriving newtype ( PersistField, PersistFieldSql
+  deriving newtype ( PersistField
                    , PathPiece, ToHttpApiData, FromHttpApiData, ToJSON, FromJSON
                    , Hashable, NFData
                    , ByteArrayAccess
                    )
 
+instance PersistFieldSql MailContentReference where
+  sqlType _ = sqlType $ Proxy @(Digest SHA3_512)
+
 derivePersistFieldJSON ''MailHeaders
diff --git a/src/Model/Types/Submission.hs b/src/Model/Types/Submission.hs
index e46458607..737017dc8 100644
--- a/src/Model/Types/Submission.hs
+++ b/src/Model/Types/Submission.hs
@@ -52,9 +52,12 @@ type PseudonymWord = CI Text
 newtype Pseudonym = Pseudonym Word24
   deriving (Eq, Ord, Read, Show, Generic, Data)
   deriving newtype ( Bounded, Enum, Integral, Num, Real, Ix
-                   , PersistField, PersistFieldSql, Random
+                   , PersistField, Random
                    )
 
+instance PersistFieldSql Pseudonym where
+  sqlType _ = sqlType $ Proxy @Word24
+
 instance FromJSON Pseudonym where
   parseJSON v@(Aeson.Number _) = do
     w <- parseJSON v :: Aeson.Parser Word32
diff --git a/src/Model/Types/Workflow.hs b/src/Model/Types/Workflow.hs
index 852de6f04..99a9998cf 100644
--- a/src/Model/Types/Workflow.hs
+++ b/src/Model/Types/Workflow.hs
@@ -1,7 +1,7 @@
 {-# LANGUAGE UndecidableInstances #-}
 
 module Model.Types.Workflow
-  ( WorkflowGraph(..)
+  ( WorkflowGraph(..), WorkflowGraphReference(..)
   , WorkflowGraphNodeLabel
   , WorkflowGraphNode(..)
   , WorkflowNodeView(..)
@@ -37,6 +37,8 @@ import Model.Types.Security (AuthDNF, PredDNF)
 import Model.Types.File (FileContentReference, FileFieldUserOption, FileField, _fieldAdditionalFiles, FileReferenceTitleMapConvertible(..))
 
 import Database.Persist.Sql (PersistFieldSql(..))
+import Web.HttpApiData (ToHttpApiData, FromHttpApiData)
+import Data.ByteArray (ByteArrayAccess)
 
 import Data.Maybe (fromJust)
 
@@ -77,11 +79,26 @@ deriving instance (Eq fileid, Eq userid, Typeable fileid, Typeable userid, Eq (F
 deriving instance (Ord fileid, Ord userid, Typeable fileid, Typeable userid, Ord (FileField fileid)) => Ord (WorkflowGraph fileid userid)
 deriving instance (Show fileid, Show userid, Show (FileField fileid)) => Show (WorkflowGraph fileid userid)
 
+newtype WorkflowGraphReference = WorkflowGraphReference (Digest SHA3_256)
+  deriving (Eq, Ord, Read, Show, Lift, Generic, Typeable)
+  deriving newtype ( PersistField
+                   , PathPiece, ToHttpApiData, FromHttpApiData, ToJSON, FromJSON
+                   , Hashable, NFData
+                   , ByteArrayAccess
+                   , Binary
+                   )
+
+instance PersistFieldSql WorkflowGraphReference where
+  sqlType _ = sqlType $ Proxy @(Digest SHA3_256)
+
 -----  WORKFLOW GRAPH: NODES  -----
 
 newtype WorkflowGraphNodeLabel = WorkflowGraphNodeLabel { unWorkflowGraphNodeLabel :: CI Text }
   deriving stock (Eq, Ord, Read, Show, Data, Generic, Typeable)
-  deriving newtype (IsString, ToJSON, ToJSONKey, FromJSON, FromJSONKey, PathPiece, PersistField, PersistFieldSql, Binary)
+  deriving newtype (IsString, ToJSON, ToJSONKey, FromJSON, FromJSONKey, PathPiece, PersistField, Binary)
+
+instance PersistFieldSql WorkflowGraphNodeLabel where
+  sqlType _ = sqlType $ Proxy @(CI Text)
 
 data WorkflowGraphNode fileid userid = WGN
   { wgnFinal        :: Maybe Icon
@@ -112,7 +129,10 @@ data WorkflowNodeMessage userid = WorkflowNodeMessage
 
 newtype WorkflowGraphEdgeLabel = WorkflowGraphEdgeLabel { unWorkflowGraphEdgeLabel :: CI Text }
   deriving stock (Eq, Ord, Read, Show, Data, Generic, Typeable)
-  deriving newtype (IsString, ToJSON, ToJSONKey, FromJSON, FromJSONKey, PathPiece, PersistField, PersistFieldSql, Binary)
+  deriving newtype (IsString, ToJSON, ToJSONKey, FromJSON, FromJSONKey, PathPiece, PersistField, Binary)
+
+instance PersistFieldSql WorkflowGraphEdgeLabel where
+  sqlType _ = sqlType $ Proxy @(CI Text)
 
 data WorkflowGraphRestriction
   = WorkflowGraphRestrictionPayloadFilled { wgrPayloadFilled :: WorkflowPayloadLabel }
@@ -341,9 +361,12 @@ classifyWorkflowScope = \case
 
 newtype WorkflowPayloadLabel = WorkflowPayloadLabel { unWorkflowPayloadLabel :: CI Text }
   deriving stock (Eq, Ord, Show, Read, Data, Generic, Typeable)
-  deriving newtype (IsString, ToJSON, ToJSONKey, FromJSON, FromJSONKey, PathPiece, PersistField, PersistFieldSql, Binary)
+  deriving newtype (IsString, ToJSON, ToJSONKey, FromJSON, FromJSONKey, PathPiece, PersistField, Binary)
   deriving anyclass (Hashable)
 
+instance PersistFieldSql WorkflowPayloadLabel where
+  sqlType _ = sqlType $ Proxy @(CI Text)
+
 newtype WorkflowStateIndex = WorkflowStateIndex { unWorkflowStateIndex :: Word64 }
   deriving stock (Eq, Ord, Show, Read, Data, Generic, Typeable)
   deriving newtype (Num, Real, Integral, Enum, Bounded, ToJSON, FromJSON, PathPiece, Binary)
@@ -1052,3 +1075,7 @@ instance Binary WorkflowScope'
 instance (Binary termid, Binary schoolid, Binary courseid) => Binary (WorkflowScope termid schoolid courseid)
 
 instance Binary userid => Binary (WorkflowRole userid)
+
+-----  TH Jail  -----
+
+makeWrapped ''WorkflowGraphReference
diff --git a/src/Settings.hs b/src/Settings.hs
index fd7b542d3..7fa29ef5b 100644
--- a/src/Settings.hs
+++ b/src/Settings.hs
@@ -210,9 +210,19 @@ data AppSettings = AppSettings
     , appInitialInstanceID      :: Maybe (Either FilePath UUID)
     , appRibbon                 :: Maybe Text
 
+    , appJobMode                :: JobMode
+
+    , appStudyFeaturesRecacheRelevanceWithin :: Maybe NominalDiffTime
+    , appStudyFeaturesRecacheRelevanceInterval :: NominalDiffTime
+
     , appMemcacheAuth           :: Bool
     } deriving Show
 
+data JobMode = JobsLocal { jobsAcceptOffload :: Bool }
+             | JobsOffload
+  deriving (Eq, Ord, Read, Show, Generic, Typeable)
+  deriving anyclass (Hashable)
+
 data ApprootScope = ApprootUserGenerated | ApprootDefault
   deriving (Eq, Ord, Read, Show, Enum, Bounded, Generic, Typeable)
   deriving anyclass (Universe, Finite, Hashable)
@@ -346,6 +356,11 @@ deriveFromJSON defaultOptions
   { fieldLabelModifier = camelToPathPiece' 2
   } ''UserDefaultConf
 
+deriveJSON defaultOptions
+  { fieldLabelModifier = camelToPathPiece' 1
+  , constructorTagModifier = camelToPathPiece' 1
+  } ''JobMode
+
 instance FromJSON LdapConf where
     parseJSON = withObject "LdapConf" $ \o -> do
         ldapTls <- o .:? "tls"
@@ -532,7 +547,7 @@ instance FromJSON AppSettings where
         appFileChunkingHashWindow     <- o .:  "file-chunking-hash-window"
         appFileChunkingParams <- maybe (fail "Could not recommend FastCDCParameters") return $ recommendFastCDCParameters appFileChunkingTargetExponent appFileChunkingHashWindow
 
-        appPruneUnreferencedFilesWithin   <- o .:  "prune-unreferenced-files-within"
+        appPruneUnreferencedFilesWithin   <- o .:? "prune-unreferenced-files-within"
         appPruneUnreferencedFilesInterval <- o .:  "prune-unreferenced-files-interval"
 
         appMaximumContentLength   <- o .: "maximum-content-length"
@@ -603,6 +618,11 @@ instance FromJSON AppSettings where
 
         appMemcacheAuth <- o .:? "memcache-auth" .!= False
 
+        appJobMode <- o .:? "job-mode" .!= JobsLocal True
+
+        appStudyFeaturesRecacheRelevanceWithin   <- o .:? "study-features-recache-relevance-within"
+        appStudyFeaturesRecacheRelevanceInterval <- o .:  "study-features-recache-relevance-interval"
+
         return AppSettings{..}
 
 makeClassy_ ''AppSettings
diff --git a/src/Utils.hs b/src/Utils.hs
index dc118b3db..295aefcf0 100644
--- a/src/Utils.hs
+++ b/src/Utils.hs
@@ -70,6 +70,8 @@ import Control.Monad.Writer.Class (MonadWriter(..))
 import Control.Monad.Catch
 import Control.Monad.Morph (hoist)
 import Control.Monad.Fail
+import Control.Monad.Trans.Cont (ContT, evalContT, callCC)
+import qualified Control.Monad.State.Class as State
 
 import Language.Haskell.TH
 import Language.Haskell.TH.Instances ()
@@ -97,6 +99,7 @@ import qualified Crypto.MAC.KMAC as KMAC
 import qualified Crypto.Hash as Crypto
 import Crypto.Hash (HashAlgorithm, Digest)
 import Crypto.Hash.Instances ()
+import qualified Crypto.Random as Crypto
 
 import Data.ByteArray (ByteArrayAccess)
 
@@ -139,6 +142,9 @@ import Text.Hamlet (Translate)
 
 import Data.Ratio ((%))
 
+import Data.UUID (UUID)
+import qualified Data.UUID as UUID
+
 {-# ANN module ("HLint: ignore Use asum" :: String) #-}
 
 
@@ -462,6 +468,10 @@ guardMonoid True  x = x
 assertMonoid :: Monoid m => (m -> Bool) -> m -> m
 assertMonoid f x = guardMonoid (f x) x
 
+maybeMonoid :: Monoid m => Maybe m -> m
+-- ^ Identify `Nothing` with `mempty`
+maybeMonoid = fromMaybe mempty
+
 ------------
 -- Tuples --
 ------------
@@ -935,6 +945,17 @@ diffTimeout timeoutLength timeoutRes act = fromMaybe timeoutRes <$> timeout time
       = let (MkFixed micro :: Micro) = realToFrac timeoutLength
          in fromInteger micro
 
+forever' :: Monad m
+         => a
+         -> (a -> m a)
+         -> m b
+forever' start cont = cont start >>= flip forever' cont
+
+foreverBreak :: Monad m
+             => ((r -> ContT r m b) -> ContT r m a)
+             -> m r
+foreverBreak cont = evalContT . callCC $ forever . cont
+
 
 --------------
 -- Foldable --
@@ -1391,6 +1412,17 @@ uniforms :: (RandomGen g, MonadSplit g m, Foldable t) => t a -> m [a]
 uniforms xs = LazyRand.evalRand go <$> getSplit
   where go = (:) <$> interleave (uniform xs) <*> go
 
+randUUIDC :: MonadIO m
+          => (forall m'. Monad m' => m' UUID -> (forall a. m a -> m' a) -> ConduitT i o m' r)
+          -> ConduitT i o m r
+randUUIDC cont = do
+  drg <- liftIO Crypto.drgNew
+  let
+    mkUUID = do
+      uuidBS <- State.state $ Crypto.randomBytesGenerate 16
+      return . fromMaybe (error $ "Could not convert bytestring to uuid: " <> show uuidBS) . UUID.fromByteString $ fromStrict uuidBS
+  evalStateC drg $ cont mkUUID lift
+
 ----------
 -- Lens --
 ----------
diff --git a/src/Utils/DateTime.hs b/src/Utils/DateTime.hs
index d41b7fb76..de3f76087 100644
--- a/src/Utils/DateTime.hs
+++ b/src/Utils/DateTime.hs
@@ -16,8 +16,9 @@ module Utils.DateTime
   , day
   ) where
 
-import ClassyPrelude.Yesod hiding (lift)
+import ClassyPrelude.Yesod hiding (lift, Proxy(..))
 import System.Locale.Read
+import Data.Proxy
 
 import Data.Time (NominalDiffTime, nominalDay, LocalTime(..), TimeOfDay, midnight, ZonedTime(..), DiffTime)
 import Data.Time.Zones as Zones (TZ)
@@ -38,7 +39,7 @@ import Instances.TH.Lift ()
 import Data.Data (Data)
 import Data.Universe
 
-import Database.Persist.Sql (PersistFieldSql)
+import Database.Persist.Sql (PersistFieldSql(..))
 
 import Utils.PathPiece
 
@@ -98,7 +99,10 @@ instance HasLocalTime TimeOfDay where
 
 newtype DateTimeFormat = DateTimeFormat { unDateTimeFormat :: String }
   deriving (Eq, Ord, Read, Show, Data, Generic, Typeable)
-  deriving newtype (ToJSON, FromJSON, PersistField, PersistFieldSql, IsString)
+  deriving newtype (ToJSON, FromJSON, PersistField, IsString)
+
+instance PersistFieldSql DateTimeFormat where
+  sqlType _ = sqlType $ Proxy @String
 
 instance Hashable DateTimeFormat
 
diff --git a/src/Utils/Lens.hs b/src/Utils/Lens.hs
index 4197649a6..09a615353 100644
--- a/src/Utils/Lens.hs
+++ b/src/Utils/Lens.hs
@@ -5,6 +5,7 @@
 module Utils.Lens ( module Utils.Lens ) where
 
 import Import.NoModel
+import Settings
 import Model
 import Model.Rating
 import qualified ClassyPrelude.Yesod as Yesod (HasHttpManager(..))
@@ -274,6 +275,9 @@ makePrisms ''AllocationPriority
 makePrisms ''RoomReference
 makeLenses_ ''RoomReference
 
+makePrisms ''JobMode
+makeLenses_ ''JobMode
+
 -- makeClassy_ ''Load
 
 --------------------------
diff --git a/src/Utils/Metrics.hs b/src/Utils/Metrics.hs
index f8b21dad5..174a74cde 100644
--- a/src/Utils/Metrics.hs
+++ b/src/Utils/Metrics.hs
@@ -5,6 +5,7 @@ module Utils.Metrics
   , registerGHCMetrics
   , observeHTTPRequestLatency
   , registerReadyMetric
+  , registerHealthCheckInterval
   , withJobWorkerState
   , observeYesodCacheSize
   , observeFavouritesQuickActionsDuration
@@ -74,6 +75,17 @@ healthReportDuration = unsafeRegister . vector ("check", "status") $ histogram i
                 "Duration of last health check performed by this Uni2work-instance"
     buckets = histogramBuckets 5e-6 100e-3
 
+data HealthCheckInterval = MkHealthCheckInterval
+
+healthCheckInterval :: (HealthCheck -> Maybe NominalDiffTime) -> Metric HealthCheckInterval
+healthCheckInterval hcInts = Metric $ return (MkHealthCheckInterval, collectHealthCheckInterval)
+  where
+    collectHealthCheckInterval = return . pure . SampleGroup info GaugeType $ do
+      (hc, Just int) <- itoList hcInts
+      return . Sample "uni2work_health_check_interval_seconds" [("check", toPathPiece hc)] . encodeUtf8 $ tshow (realToFrac int :: Nano)
+    info = Info "uni2work_health_check_interval_seconds"
+                "Target interval at which health checks are executed by this Uni2work-instance"
+
 {-# NOINLINE httpRequestLatency #-}
 httpRequestLatency :: Vector Label3 Histogram
 httpRequestLatency = unsafeRegister . vector ("handler", "method", "status") $ histogram info buckets
@@ -219,9 +231,9 @@ missingFiles = unsafeRegister . vector "ref" $ gauge info
 
 withHealthReportMetrics :: MonadIO m => m HealthReport -> m HealthReport
 withHealthReportMetrics act = do
-  before <- liftIO $ getTime Monotonic
+  before <- liftIO getPOSIXTime
   report <- act
-  after <- liftIO $ getTime Monotonic
+  after <- liftIO getPOSIXTime
 
   let checkVal = toPathPiece $ classifyHealthReport report
       statusVal = toPathPiece $ healthReportStatus report
@@ -258,6 +270,9 @@ observeHTTPRequestLatency classifyHandler app req respond' = do
 registerReadyMetric :: MonadIO m => m ()
 registerReadyMetric = liftIO $ void . register . readyMetric =<< getPOSIXTime
 
+registerHealthCheckInterval :: MonadIO m => (HealthCheck -> Maybe NominalDiffTime) -> m ()
+registerHealthCheckInterval = liftIO . void . register . healthCheckInterval
+
 classifyJobWorkerState :: JobWorkerId -> JobWorkerState -> Prometheus.Label4
 classifyJobWorkerState wId jws = (showWorkerId wId, tag, maybe "n/a" pack mJobCtl, maybe "n/a" pack mJob)
   where
diff --git a/src/Utils/Parameters.hs b/src/Utils/Parameters.hs
index 5d8faa79f..679a9a46b 100644
--- a/src/Utils/Parameters.hs
+++ b/src/Utils/Parameters.hs
@@ -32,6 +32,7 @@ data GlobalGetParam = GetLang
                     | GetDownload
                     | GetError
                     | GetSelectTable
+                    | GetGenerateToken
   deriving (Eq, Ord, Enum, Bounded, Read, Show, Generic)
   deriving anyclass (Universe, Finite)
 
diff --git a/src/Utils/Workflow.hs b/src/Utils/Workflow.hs
index 8facd298d..5454c150a 100644
--- a/src/Utils/Workflow.hs
+++ b/src/Utils/Workflow.hs
@@ -10,6 +10,8 @@ module Utils.Workflow
   , decryptWorkflowStateIndex, encryptWorkflowStateIndex
   , isTopWorkflowScope, isTopWorkflowScopeSql
   , selectWorkflowInstanceDescription
+  , SharedWorkflowGraphException(..), getSharedDBWorkflowGraph, getSharedIdWorkflowGraph
+  , insertSharedWorkflowGraph
   ) where
 
 import Import.NoFoundation
@@ -19,11 +21,15 @@ import qualified Crypto.MAC.KMAC as Crypto
 import qualified Data.ByteArray as BA
 import qualified Data.Binary as Binary
 import Crypto.Hash.Algorithms (SHAKE256)
+import qualified Crypto.Hash as Crypto
 import Language.Haskell.TH (nameBase)
+import qualified Data.Aeson as Aeson
 
 import qualified Database.Esqueleto as E
 import qualified Database.Esqueleto.Utils as E
 
+{-# ANN module ("HLint: ignore Use newtype instead of data" :: String) #-}
+
 
 type RouteWorkflowScope = WorkflowScope TermId SchoolId (TermId, SchoolId, CourseShorthand)
 type DBWorkflowScope = WorkflowScope TermIdentifier SchoolShorthand SqlBackendKey
@@ -130,3 +136,35 @@ selectWorkflowInstanceDescription wiId = withReaderT (projectBackend @SqlReadBac
     return $ workflowInstanceDescription E.^. WorkflowInstanceDescriptionLanguage
   descLang <- traverse selectLanguage . nonEmpty $ E.unValue <$> descLangs
   fmap join . for descLang $ \descLang' -> getBy $ UniqueWorkflowInstanceDescription wiId descLang'
+
+
+data SharedWorkflowGraphException
+  = SharedWorkflowGraphNotFound SharedWorkflowGraphId
+  deriving (Eq, Ord, Read, Show, Generic, Typeable)
+  deriving anyclass (Exception)
+  
+getSharedDBWorkflowGraph :: ( MonadHandler m
+                            , BackendCompatible SqlReadBackend backend
+                            )
+                         => SharedWorkflowGraphId
+                         -> ReaderT backend m DBWorkflowGraph
+getSharedDBWorkflowGraph swgId = $cachedHereBinary swgId . withReaderT (projectBackend @SqlReadBackend) $ do
+  maybe (liftHandler . throwM $ SharedWorkflowGraphNotFound swgId) (return . sharedWorkflowGraphGraph) =<< get swgId
+  
+getSharedIdWorkflowGraph :: ( MonadHandler m
+                            , BackendCompatible SqlReadBackend backend
+                            )
+                         => SharedWorkflowGraphId
+                         -> ReaderT backend m IdWorkflowGraph
+getSharedIdWorkflowGraph = fmap (review _DBWorkflowGraph) . getSharedDBWorkflowGraph
+
+insertSharedWorkflowGraph :: ( MonadIO m
+                             , BackendCompatible SqlBackend backend
+                             )
+                          => DBWorkflowGraph
+                          -> ReaderT backend m SharedWorkflowGraphId
+insertSharedWorkflowGraph graph = withReaderT (projectBackend @SqlBackend) $
+    swgId' <$ repsert swgId' (SharedWorkflowGraph swgId graph)
+  where
+    swgId = WorkflowGraphReference . Crypto.hashlazy $ Aeson.encode graph
+    swgId' = SharedWorkflowGraphKey swgId
diff --git a/stack.nix b/stack.nix
index 0885ab569..53fb60f6b 100644
--- a/stack.nix
+++ b/stack.nix
@@ -9,7 +9,7 @@ in pkgs.haskell.lib.buildStackProject {
   inherit (haskellPackages) stack;
   name = "stackenv";
   buildInputs = (with pkgs;
-    [ postgresql zlib libsodium gmp
+    [ postgresql zlib libsodium gmp llvm_9
     ]) ++ (with haskellPackages;
     [ yesod-bin happy alex
     ]);
diff --git a/test/Database/Fill.hs b/test/Database/Fill.hs
index 654dc024d..f619a1044 100644
--- a/test/Database/Fill.hs
+++ b/test/Database/Fill.hs
@@ -34,6 +34,7 @@ import qualified Data.Conduit.Combinators as C
 
 import qualified Data.Yaml as Yaml
 
+import Utils.Workflow
 import Utils.Workflow.Lint
 
 import System.Directory (getModificationTime)
@@ -532,7 +533,7 @@ fillDb = do
     (Just now)
     now
     True
-    False
+    Nothing
   insert_ $ StudyFeatures
     maxMuster
     sdBsc
@@ -543,7 +544,7 @@ fillDb = do
     (Just now)
     now
     True
-    False
+    Nothing
   insert_ $ StudyFeatures
     tinaTester
     sdBsc
@@ -554,7 +555,7 @@ fillDb = do
     (Just now)
     now
     False
-    False
+    Nothing
   insert_ $ StudyFeatures
     tinaTester
     sdLAG
@@ -565,7 +566,7 @@ fillDb = do
     (Just now)
     now
     True
-    False
+    Nothing
   insert_ $ StudyFeatures
     tinaTester
     sdLAR
@@ -576,7 +577,7 @@ fillDb = do
     (Just now)
     now
     True
-    False
+    Nothing
   insert_ $ StudyFeatures
     tinaTester
     sdMst
@@ -587,7 +588,7 @@ fillDb = do
     (Just now)
     now
     True
-    False
+    Nothing
 
   -- FFP
   let nbrs :: [Int]
@@ -1330,8 +1331,9 @@ fillDb = do
       displayLinterIssue = liftIO . hPutStrLn stderr . displayException
 
   handleSql displayLinterIssue $ do
-    workflowDefinitionGraph <- Yaml.decodeFileThrow $ testdataDir </> "workflows" </> "theses.yaml"
-    for_ (lintWorkflowGraph workflowDefinitionGraph) $ mapM_ throwM
+    graph <- Yaml.decodeFileThrow $ testdataDir </> "workflows" </> "theses.yaml"
+    for_ (lintWorkflowGraph graph) $ mapM_ throwM
+    workflowDefinitionGraph <- insertSharedWorkflowGraph graph
     let
       thesesWorkflowDef = WorkflowDefinition{..}
         where workflowDefinitionInstanceCategory = Just "theses"
@@ -1366,8 +1368,9 @@ fillDb = do
       }
 
   handleSql displayLinterIssue $ do
-    workflowDefinitionGraph <- Yaml.decodeFileThrow $ testdataDir </> "workflows" </> "recognitions-ifi.yaml"
-    for_ (lintWorkflowGraph workflowDefinitionGraph) $ mapM_ throwM
+    graph <- Yaml.decodeFileThrow $ testdataDir </> "workflows" </> "recognitions-ifi.yaml"
+    for_ (lintWorkflowGraph graph) $ mapM_ throwM
+    workflowDefinitionGraph <- insertSharedWorkflowGraph graph
     let
       recognitionsWorkflowDef = WorkflowDefinition{..}
         where workflowDefinitionInstanceCategory = Just "recognitions-ifi"