Merge branch 'master' into hunternif

80 files changed, 5633 insertions, 488 deletions

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..48e3403
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+# Auto detect text files and perform LF normalization
+*       text=auto
+
+# Shell scripts require LF
+*.sh    text eol=lf
diff --git a/.github/workflows/build-containers.yml b/.github/workflows/build-containers.yml
new file mode 100644
index 0000000..c688a5f
--- /dev/null
+++ b/.github/workflows/build-containers.yml
@@ -0,0 +1,108 @@
+name: Build Docker containers
+on:
+  push:
+    branches:
+      - master
+jobs:
+  build-client:
+    name: Build and push client/ Docker container
+    runs-on: ubuntu-latest
+    steps:
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Determine metadata
+        run: |
+          CLOSEST_VER="$(git describe --tags --abbrev=0 $GITHUB_SHA)"
+          CLOSEST_MAJOR_VER="$(echo ${CLOSEST_VER} | cut -d'.' -f1)"
+          CLOSEST_MINOR_VER="$(echo ${CLOSEST_VER} | cut -d'.' -f2)"
+          SHORT_COMMIT=$(echo $GITHUB_SHA | cut -c1-8)
+          BUILD_INFO="v${CLOSEST_VER}-${SHORT_COMMIT}"
+          BUILD_DATE="$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
+
+          echo "major_tag=${CLOSEST_MAJOR_VER}" >> $GITHUB_ENV
+          echo "minor_tag=${CLOSEST_MAJOR_VER}.${CLOSEST_MINOR_VER}" >> $GITHUB_ENV
+          echo "build_info=${BUILD_INFO}" >> $GITHUB_ENV
+          echo "build_date=${BUILD_DATE}" >> $GITHUB_ENV
+
+          echo "Build Info: ${BUILD_INFO}"
+          echo "Build Date: ${BUILD_DATE}"
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build container
+        run: >
+          docker buildx build --push
+          --platform linux/amd64,linux/arm/v7,linux/arm64/v8
+          --build-arg BUILD_INFO=${{ env.build_info }}
+          --build-arg BUILD_DATE=${{ env.build_date }}
+          --build-arg SOURCE_COMMIT=$GITHUB_SHA
+          --build-arg DOCKER_REPO=szurubooru/client
+          -t "szurubooru/client:latest"
+          -t "szurubooru/client:${{ env.major_tag }}"
+          -t "szurubooru/client:${{ env.minor_tag }}"
+          ./client
+
+  build-server:
+    name: Build and push server/ Docker container
+    runs-on: ubuntu-latest
+    steps:
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Determine metadata
+        run: |
+          CLOSEST_VER="$(git describe --tags --abbrev=0 $GITHUB_SHA)"
+          CLOSEST_MAJOR_VER="$(echo ${CLOSEST_VER} | cut -d'.' -f1)"
+          CLOSEST_MINOR_VER="$(echo ${CLOSEST_VER} | cut -d'.' -f2)"
+          SHORT_COMMIT=$(echo $GITHUB_SHA | cut -c1-8)
+          BUILD_INFO="v${CLOSEST_VER}-${SHORT_COMMIT}"
+          BUILD_DATE="$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
+
+          echo "major_tag=${CLOSEST_MAJOR_VER}" >> $GITHUB_ENV
+          echo "minor_tag=${CLOSEST_MAJOR_VER}.${CLOSEST_MINOR_VER}" >> $GITHUB_ENV
+          echo "build_info=${BUILD_INFO}" >> $GITHUB_ENV
+          echo "build_date=${BUILD_DATE}" >> $GITHUB_ENV
+
+          echo "Build Info: ${BUILD_INFO}"
+          echo "Build Date: ${BUILD_DATE}"
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build container
+        run: >
+          docker buildx build --push
+          --platform linux/amd64,linux/arm/v7,linux/arm64/v8
+          --build-arg BUILD_DATE=${{ env.build_date }}
+          --build-arg SOURCE_COMMIT=$GITHUB_SHA
+          --build-arg DOCKER_REPO=szurubooru/server
+          -t "szurubooru/server:latest"
+          -t "szurubooru/server:${{ env.major_tag }}"
+          -t "szurubooru/server:${{ env.minor_tag }}"
+          ./server
diff --git a/.github/workflows/run-unit-tests.yml b/.github/workflows/run-unit-tests.yml
new file mode 100644
index 0000000..9ea14ed
--- /dev/null
+++ b/.github/workflows/run-unit-tests.yml
@@ -0,0 +1,28 @@
+name: Run unit tests
+on: [push, pull_request]
+jobs:
+  test-server:
+    name: Run pytest for server/
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build test container
+        run: >
+          docker buildx build --load
+          --platform linux/amd64 --target testing
+          -t test_container
+          ./server
+
+      - name: Run unit tests
+        run: >
+          docker run --rm -t test_container
+          --color=no
+          --cov-report=term-missing:skip-covered
+          --cov=szurubooru
+          szurubooru/
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 5053b6e..75a55d6 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,28 +1,29 @@
 repos:
 
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v3.2.0
+    rev: v4.4.0
     hooks:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer
     -   id: check-yaml
     -   id: mixed-line-ending
 
+
 -   repo: https://github.com/Lucas-C/pre-commit-hooks
-    rev: v1.1.9
+    rev: v1.4.2
     hooks:
     -   id: remove-tabs
 
 -   repo: https://github.com/psf/black
-    rev: 20.8b1
+    rev: '23.1.0'
     hooks:
       - id: black
         files: 'server/'
         types: [python]
-        language_version: python3.8
+        language_version: python3.9
 
--   repo: https://github.com/timothycrosley/isort
-    rev: '5.4.2'
+-   repo: https://github.com/PyCQA/isort
+    rev: '5.12.0'
     hooks:
     -   id: isort
         files: 'server/'
@@ -31,8 +32,8 @@ repos:
         additional_dependencies:
         -   toml
 
--   repo: https://github.com/prettier/prettier
-    rev: '2.1.1'
+-   repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v2.7.1
     hooks:
     -   id: prettier
         files: client/js/
@@ -40,7 +41,7 @@ repos:
         args: ['--config', 'client/.prettierrc.yml']
 
 -   repo: https://github.com/pre-commit/mirrors-eslint
-    rev: v7.8.0
+    rev: v8.33.0
     hooks:
     -   id: eslint
         files: client/js/
@@ -48,8 +49,8 @@ repos:
         additional_dependencies:
         -   eslint-config-prettier
 
--   repo: https://gitlab.com/pycqa/flake8
-    rev: '3.8.3'
+-   repo: https://github.com/PyCQA/flake8
+    rev: '6.0.0'
     hooks:
     -   id: flake8
         files: server/szurubooru/
@@ -57,44 +58,5 @@ repos:
         -   flake8-print
         args: ['--config=server/.flake8']
 
--   repo: local
-    hooks:
-    -   id: docker-build-client
-        name: Docker - build client
-        entry: bash -c 'docker build client/'
-        language: system
-        types: [file]
-        files: client/
-        pass_filenames: false
-
-    -   id: docker-build-server
-        name: Docker - build server
-        entry: bash -c 'docker build server/'
-        language: system
-        types: [file]
-        files: server/
-        pass_filenames: false
-
-    -   id: pytest
-        name: pytest
-        entry: bash -c 'docker run --rm -t $(docker build --target testing -q server/) szurubooru/'
-        language: system
-        types: [python]
-        files: server/szurubooru/
-        exclude: server/szurubooru/migrations/
-        pass_filenames: false
-        stages: [push]
-
-    -   id: pytest-cov
-        name: pytest
-        entry: bash -c 'docker run --rm -t $(docker build --target testing -q server/) --cov-report=term-missing:skip-covered --cov=szurubooru szurubooru/'
-        language: system
-        types: [python]
-        files: server/szurubooru/
-        exclude: server/szurubooru/migrations/
-        pass_filenames: false
-        verbose: true
-        stages: [manual]
-
 fail_fast: true
 exclude: LICENSE.md
diff --git a/README.md b/README.md
index a86ef79..6a38501 100644
--- a/README.md
+++ b/README.md
@@ -3,12 +3,12 @@
 Szurubooru is an image board engine inspired by services such as Danbooru,
 Gelbooru and Moebooru dedicated for small and medium communities. Its name [has
 its roots in Polish language and has onomatopeic meaning of scraping or
-scrubbing](http://sjp.pwn.pl/sjp/;2527372). It is pronounced as *shoorubooru*.
+scrubbing](https://sjp.pwn.pl/sjp/;2527372). It is pronounced as *shoorubooru*.
 
 ## Features
 
 - Post content: images (JPG, PNG, GIF, animated GIF), videos (MP4, WEBM), Flash animations
-- Ability to retrieve web video content using [youtube-dl](https://github.com/ytdl-org/youtube-dl)
+- Ability to retrieve web video content using [yt-dlp](https://github.com/yt-dlp/yt-dlp)
 - Post comments
 - Post notes / annotations, including arbitrary polygons
 - Rich JSON REST API ([see documentation](doc/API.md))
diff --git a/client/Dockerfile b/client/Dockerfile
index d7091e3..35b83c2 100644
--- a/client/Dockerfile
+++ b/client/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:lts as builder
+FROM --platform=$BUILDPLATFORM node:lts as builder
 WORKDIR /opt/app
 
 COPY package.json package-lock.json ./
@@ -11,7 +11,7 @@ ARG CLIENT_BUILD_ARGS="--debug"
 RUN BASE_URL="__BASEURL__" node build.js --gzip ${CLIENT_BUILD_ARGS}
 
 
-FROM scratch as approot
+FROM --platform=$BUILDPLATFORM scratch as approot
 
 COPY docker-start.sh /
 
diff --git a/client/css/comment-control.styl b/client/css/comment-control.styl
index 0d5959b..cd2d729 100644
--- a/client/css/comment-control.styl
+++ b/client/css/comment-control.styl
@@ -127,6 +127,10 @@ $comment-border-color = #DDD
             color: mix($main-color, $inactive-link-color-darktheme)
 
 .comment-content
+    p
+        word-wrap: normal
+        word-break: break-word
+
     ul, ol
         list-style-position: inside
         margin: 1em 0
diff --git a/client/css/post-list-view.styl b/client/css/post-list-view.styl
index cfaf3e1..1609870 100644
--- a/client/css/post-list-view.styl
+++ b/client/css/post-list-view.styl
@@ -139,6 +139,29 @@
                     &[data-disabled]
                         background: rgba(200, 200, 200, 0.7)
 
+                .delete-flipper
+                    display: inline-block
+                    padding: 0.5em
+                    box-sizing: border-box
+                    border: 0
+                    &:after
+                        display: inline-block
+                        width: 1em
+                        height: 1em
+                        text-align: center
+                        line-height: 1em
+                        font-size: 2.2em
+                    &.delete
+                        background: rgba(255, 0, 0, 0.7)
+                        &:after
+                            color: white
+                            font-family: FontAwesome;
+                            content: "\f1f8"; // fa-trash
+                    &:not(.delete)
+                        background: rgba(200, 200, 200, 0.7)
+                        &:after
+                            color: white
+                            content: '-'
 
             .thumbnail
                 width: 100%
@@ -189,6 +212,9 @@
             vertical-align: top
         @media (max-width: 1000px)
             display: block
+            &.bulk-edit-tags:not(.opened), &.bulk-edit-safety:not(.opened)
+                float: left
+                margin-right: 1em
     input
         margin-bottom: 0.25em
         margin-right: 0.25em
@@ -286,6 +312,21 @@
             .hint
                 margin-right: 1em
 
+            @media (max-width: 1000px)
+                margin-left: 0
+    .bulk-edit-delete
+        &.opened
+            .start
+                @media (max-width: 1000px)
+                    margin-left: 0
+        &:not(.opened)
+            .start
+                display: none
+        .append.open
+            @media (max-width: 1000px)
+                margin-left: 0
+        .start
+            margin-left: 1em
     .safety
         margin-right: 0.25em
         &.safety-safe
diff --git a/client/css/post-main-view.styl b/client/css/post-main-view.styl
index a257b15..0ff29ec 100644
--- a/client/css/post-main-view.styl
+++ b/client/css/post-main-view.styl
@@ -15,7 +15,7 @@
             border: 0
             outline: 0
 
-        nav.buttons
+        >.sidebar>nav.buttons, >.content nav.buttons
             margin-top: 0
             display: flex
             flex-wrap: wrap
@@ -53,8 +53,11 @@
         .post-content
             margin: 0
 
+    .after-mobile-controls
+        width: 100%
+
 .darktheme .post-view
-    >.sidebar
+    >.sidebar, >.content
         nav.buttons
             article
                 a:not(.inactive):hover
@@ -64,6 +67,8 @@
 @media (max-width: 800px)
     .post-view
         flex-wrap: wrap
+        >.after-mobile-controls
+            order: 3
         >.sidebar
             order: 2
             min-width: 100%
@@ -127,7 +132,6 @@
         h1
             margin-bottom: 0.5em
         .thumbnail
-            background-position: 50% 30%
             width: 4em
             height: 3em
         li
diff --git a/client/css/post-upload.styl b/client/css/post-upload.styl
index 6dca386..572b74c 100644
--- a/client/css/post-upload.styl
+++ b/client/css/post-upload.styl
@@ -14,8 +14,14 @@ $cancel-button-color = tomato
         &.inactive input[type=submit],
         &.inactive .control-checkbox,
         &.inactive .tags,
+        &.inactive .skip-duplicates
+        &.inactive .always-upload-similar
+        &.inactive .pause-remain-on-error
         &.uploading input[type=submit],
         &.uploading .control-checkbox,
+        &.uploading .skip-duplicates,
+        &.uploading .always-upload-similar
+        &.uploading .pause-remain-on-error
         &:not(.uploading) .cancel
             display: none
 
@@ -54,6 +60,12 @@ $cancel-button-color = tomato
     .control-checkbox
         margin-left: 1em
 
+    .always-upload-similar
+        margin-left: 1em
+
+    .pause-remain-on-error
+        margin-left: 1em
+
     form>.messages
         margin-top: 1em
 
@@ -67,6 +79,14 @@ $cancel-button-color = tomato
             margin: 0 0 1.2em 0
             padding-left: 13em
 
+            img
+                width: 100%
+                height: 100%
+            
+            video
+                width: 100%
+                height: 100%
+
             &>.thumbnail-wrapper
                 float: left
                 width: 12em
diff --git a/client/css/user-list-view.styl b/client/css/user-list-view.styl
index f1569f8..64915b4 100644
--- a/client/css/user-list-view.styl
+++ b/client/css/user-list-view.styl
@@ -21,10 +21,11 @@
     .details
         font-size: 90%
         line-height: 130%
+    .image
+        margin: 0.25em 0.6em 0.25em 0
     .thumbnail
         width: 3em
         height: 3em
-        margin: 0.25em 0.6em 0 0
 
 .darktheme .user-list
     ul li
diff --git a/client/hooks/build b/client/hooks/build
deleted file mode 100755
index 46443f4..0000000
--- a/client/hooks/build
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-
-CLOSEST_VER=$(git describe --tags --abbrev=0 ${SOURCE_COMMIT})
-if git describe --exact-match --abbrev=0 ${SOURCE_COMMIT} 2> /dev/null; then
-    BUILD_INFO="v${CLOSEST_VER}"
-else
-    BUILD_INFO="v${CLOSEST_VER}-edge-$(git rev-parse --short ${SOURCE_COMMIT})"
-fi
-
-echo "Using BUILD_INFO=${BUILD_INFO}"
-docker build \
-    --build-arg BUILD_INFO=${BUILD_INFO} \
-    --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') \
-    --build-arg SOURCE_COMMIT \
-    --build-arg DOCKER_REPO \
-    -f $DOCKERFILE_PATH -t $IMAGE_NAME .
diff --git a/client/hooks/post_push b/client/hooks/post_push
deleted file mode 100755
index 1b1e0ad..0000000
--- a/client/hooks/post_push
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/bin/sh
-
-add_tag() {
-    echo "Also tagging image as ${DOCKER_REPO}:${1}"
-    docker tag $IMAGE_NAME $DOCKER_REPO:$1
-    docker push $DOCKER_REPO:$1
-}
-
-CLOSEST_VER=$(git describe --tags --abbrev=0)
-CLOSEST_MAJOR_VER=$(echo ${CLOSEST_VER} | cut -d'.' -f1)
-CLOSEST_MINOR_VER=$(echo ${CLOSEST_VER} | cut -d'.' -f2)
-
-add_tag "${CLOSEST_MAJOR_VER}-edge"
-add_tag "${CLOSEST_MAJOR_VER}.${CLOSEST_MINOR_VER}-edge"
-
-if git describe --exact-match --abbrev=0 2> /dev/null; then
-    add_tag "${CLOSEST_MAJOR_VER}"
-    add_tag "${CLOSEST_MAJOR_VER}.${CLOSEST_MINOR_VER}"
-fi
diff --git a/client/html/index.htm b/client/html/index.htm
index a5cd68e..2f0f4e4 100644
--- a/client/html/index.htm
+++ b/client/html/index.htm
@@ -2,7 +2,7 @@
 <html>
 <head>
     <meta charset='utf-8'/>
-    <meta name='viewport' content='width=device-width, initial-scale=1, minimum-scale=1'/>
+    <meta name='viewport' content='width=device-width, initial-scale=1.0'>
     <meta name='theme-color' content='#24aadd'/>
     <meta name='apple-mobile-web-app-capable' content='yes'/>
     <meta name='apple-mobile-web-app-status-bar-style' content='black'/>
diff --git a/client/html/post_merge_side.tpl b/client/html/post_merge_side.tpl
index fe70502..a08070f 100644
--- a/client/html/post_merge_side.tpl
+++ b/client/html/post_merge_side.tpl
@@ -42,6 +42,7 @@
                     'image/heic': 'HEIC',
                     'video/webm': 'WEBM',
                     'video/mp4': 'MPEG-4',
+                    'video/quicktime': 'MOV',
                     'application/x-shockwave-flash': 'SWF',
                 }[ctx.post.mimeType] +
                 ' (' +
diff --git a/client/html/post_readonly_sidebar.tpl b/client/html/post_readonly_sidebar.tpl
index 1cae84f..3e0927b 100644
--- a/client/html/post_readonly_sidebar.tpl
+++ b/client/html/post_readonly_sidebar.tpl
@@ -15,9 +15,10 @@
                     'image/heic': 'HEIC',
                     'video/webm': 'WEBM',
                     'video/mp4': 'MPEG-4',
+                    'video/quicktime': 'MOV',
                     'application/x-shockwave-flash': 'SWF',
-                }[ctx.post.mimeType] %>
-            </a>
+                }[ctx.post.mimeType] %><!--
+            --></a>
             (<%- ctx.post.canvasWidth %>x<%- ctx.post.canvasHeight %>)
             <% if (ctx.post.flags.length) { %><!--
                 --><% if (ctx.post.flags.includes('loop')) { %><i class='fa fa-redo-alt'></i><% } %><!--
@@ -57,7 +58,7 @@
             Search on
             <a target="_blank" href='http://iqdb.org/?url=<%- encodeURIComponent(ctx.post.fullContentUrl) %>'>IQDB</a> &middot;
             <a target="_blank" href='https://danbooru.donmai.us/posts?tags=md5:<%- ctx.post.checksumMD5 %>'>Danbooru</a> &middot;
-            <a target="_blank" href='https://www.google.com/searchbyimage?&image_url=<%- encodeURIComponent(ctx.post.fullContentUrl) %>'>Google Images</a>
+            <a target="_blank" href='https://lens.google.com/uploadbyurl?url=<%- encodeURIComponent(ctx.post.fullContentUrl) %>'>Google Images</a>
         </section>
 
         <section class='social'>
@@ -111,10 +112,10 @@
                         --><% if (ctx.canListPosts) { %><!--
                             --><a href='<%- ctx.formatClientLink('posts', {query: ctx.escapeTagName(tag.names[0])}) %>' class='<%= ctx.makeCssName(tag.category, 'tag') %>'><!--
                         --><% } %><!--
-                            --><%- ctx.getPrettyName(tag.names[0]) %>&#32;<!--
+                            --><%- ctx.getPrettyName(tag.names[0]) %><!--
                         --><% if (ctx.canListPosts) { %><!--
                             --></a><!--
-                        --><% } %><!--
+                        --><% } %>&#32;<!--
                         --><span class='tag-usages' data-pseudo-content='<%- tag.postCount %>'></span><!--
                     --></li><!--
                 --><% } %><!--
diff --git a/client/html/post_upload.tpl b/client/html/post_upload.tpl
index 0dc4f0b..c256e55 100644
--- a/client/html/post_upload.tpl
+++ b/client/html/post_upload.tpl
@@ -7,7 +7,7 @@
 
             <span class='skip-duplicates control-checkbox'>
                 <%= ctx.makeCheckbox({
-                    text: 'Skip duplicates',
+                    text: 'Skip duplicate',
                     name: 'skip-duplicates',
                     checked: false,
                 }) %>
@@ -17,10 +17,25 @@
                 <%= ctx.makeCheckbox({
                     text: 'Copy tags to originals',
                     name: 'copy-tags-to-originals',
+                }) %>
+            </span>
+
+            <span class='always-upload-similar'>
+                <%= ctx.makeCheckbox({
+                    text: 'Force upload similar',
+                    name: 'always-upload-similar',
                     checked: false,
                 }) %>
             </span>
 
+            <span class='pause-remain-on-error'>
+                <%= ctx.makeCheckbox({
+                    text: 'Pause on error',
+                    name: 'pause-remain-on-error',
+                    checked: true,
+                }) %>
+            </span>
+
             <div class='tags'>
                 <%= ctx.makeTextInput({}) %>
             </div>
diff --git a/client/html/post_upload_row.tpl b/client/html/post_upload_row.tpl
index 559e935..26f174b 100644
--- a/client/html/post_upload_row.tpl
+++ b/client/html/post_upload_row.tpl
@@ -61,6 +61,7 @@
                             text: 'Upload anonymously',
                             name: 'anonymous',
                             checked: ctx.uploadable.anonymous,
+                            readonly: ctx.uploadable.forceAnonymous,
                         }) %>
                     </div>
                 <% } %>
diff --git a/client/html/posts_header.tpl b/client/html/posts_header.tpl
index ef2e253..7d5fa78 100644
--- a/client/html/posts_header.tpl
+++ b/client/html/posts_header.tpl
@@ -76,6 +76,13 @@
             %><a href class='mousetrap button append open'>Mass add relation</a><%
             %><a href class='mousetrap button append close'>Stop adding relation</a><%
         %></form><%
+        if (ctx.canBulkDelete) {
+            %><form class='horizontal bulk-edit bulk-edit-delete'><%
+                %><a href class='mousetrap button append open'>Mass delete</a><%
+                %><input class='mousetrap start' type='submit' value='Delete selected posts'/><%
+                %><a href class='mousetrap button append close'>Stop deleting</a><%
+            %></form><%
+        }
     %></div><%
     if (ctx.canViewMetrics) {
     %><div class='metrics-block hidden'></div><%
diff --git a/client/html/posts_page.tpl b/client/html/posts_page.tpl
index 5336fe8..bbf6a2d 100644
--- a/client/html/posts_page.tpl
+++ b/client/html/posts_page.tpl
@@ -54,6 +54,10 @@
                                 <% } %>
                             </span>
                         <% } %>
+                        <% if (ctx.canBulkDelete && ctx.parameters && ctx.parameters.delete) { %>
+                            <a href class='delete-flipper'>
+                            </a>
+                        <% } %>
                     </span>
                 </li>
             <% } %>
diff --git a/client/js/controllers/home_controller.js b/client/js/controllers/home_controller.js
index ea2a411..528ce62 100644
--- a/client/js/controllers/home_controller.js
+++ b/client/js/controllers/home_controller.js
@@ -17,7 +17,7 @@ class HomeController {
             buildDate: config.meta.buildDate,
             canListSnapshots: api.hasPrivilege("snapshots:list"),
             canListPosts: api.hasPrivilege("posts:list"),
-            isDevelopmentMode: config.environment == "development"
+            isDevelopmentMode: config.environment == "development",
         });
 
         Info.get().then(
diff --git a/client/js/controllers/pool_controller.js b/client/js/controllers/pool_controller.js
index ad0b956..f49827f 100644
--- a/client/js/controllers/pool_controller.js
+++ b/client/js/controllers/pool_controller.js
@@ -91,16 +91,16 @@ class PoolController {
     _evtUpdate(e) {
         this._view.clearMessages();
         this._view.disableForm();
-        if (e.detail.names !== undefined) {
+        if (e.detail.names !== undefined && e.detail.names !== null) {
             e.detail.pool.names = e.detail.names;
         }
-        if (e.detail.category !== undefined) {
+        if (e.detail.category !== undefined && e.detail.category !== null) {
             e.detail.pool.category = e.detail.category;
         }
-        if (e.detail.description !== undefined) {
+        if (e.detail.description !== undefined && e.detail.description !== null) {
             e.detail.pool.description = e.detail.description;
         }
-        if (e.detail.posts !== undefined) {
+        if (e.detail.posts !== undefined && e.detail.posts !== null) {
             e.detail.pool.posts.clear();
             for (let postId of e.detail.posts) {
                 e.detail.pool.posts.add(
diff --git a/client/js/controllers/pool_list_controller.js b/client/js/controllers/pool_list_controller.js
index 91d655c..a66f816 100644
--- a/client/js/controllers/pool_list_controller.js
+++ b/client/js/controllers/pool_list_controller.js
@@ -43,6 +43,8 @@ class PoolListController {
         this._headerView.addEventListener(
             "submit",
             (e) => this._evtSubmit(e),
+        );
+        this._headerView.addEventListener(
             "navigate",
             (e) => this._evtNavigate(e)
         );
diff --git a/client/js/controllers/post_list_controller.js b/client/js/controllers/post_list_controller.js
index 7a8ff9e..0146e9e 100644
--- a/client/js/controllers/post_list_controller.js
+++ b/client/js/controllers/post_list_controller.js
@@ -47,6 +47,7 @@ class PostListController {
             canBulkEditTags: api.hasPrivilege("posts:bulk-edit:tags"),
             canBulkEditSafety: api.hasPrivilege("posts:bulk-edit:safety"),
             canViewMetrics: api.hasPrivilege("metrics:list"),
+            canBulkDelete: api.hasPrivilege("posts:bulk-edit:delete"),
             bulkEdit: {
                 tags: this._bulkEditTags,
             },
@@ -55,6 +56,16 @@ class PostListController {
             this._evtNavigate(e)
         );
 
+        if (this._headerView._bulkDeleteEditor) {
+            this._headerView._bulkDeleteEditor.addEventListener(
+                "deleteSelectedPosts",
+                (e) => {
+                    this._evtDeleteSelectedPosts(e);
+                }
+            );
+        }
+
+        this._postsMarkedForDeletion = [];
         this._syncPageController();
     }
 
@@ -143,6 +154,38 @@ class PostListController {
         this._ctx.parameters.relations = relations.join(" ") || " ";
     }
 
+    _evtMarkForDeletion(e) {
+        const postId = e.detail;
+
+        // Add or remove post from delete list
+        if (e.detail.delete) {
+            this._postsMarkedForDeletion.push(e.detail.post);
+        } else {
+            this._postsMarkedForDeletion = this._postsMarkedForDeletion.filter(
+                (x) => x.id != e.detail.post.id
+            );
+        }
+    }
+
+    _evtDeleteSelectedPosts(e) {
+        if (this._postsMarkedForDeletion.length == 0) return;
+
+        if (
+            confirm(
+                `Are you sure you want to delete ${this._postsMarkedForDeletion.length} posts?`
+            )
+        ) {
+            Promise.all(
+                this._postsMarkedForDeletion.map((post) => post.delete())
+            )
+                .catch((error) => window.alert(error.message))
+                .then(() => {
+                    this._postsMarkedForDeletion = [];
+                    this._headerView._navigate();
+                });
+        }
+    }
+
     _syncPageController() {
         this._pageController.run({
             parameters: this._ctx.parameters,
@@ -177,6 +220,11 @@ class PostListController {
                         tags: this._bulkEditTags,
                         relations: this._ctx.parameters.relations,
                     },
+                    canBulkDelete: api.hasPrivilege("posts:bulk-edit:delete"),
+                    bulkEdit: {
+                        tags: this._bulkEditTags,
+                        markedForDeletion: this._postsMarkedForDeletion,
+                    },
                     postFlow: settings.get().postFlow,
                 });
                 const view = new PostsPageView(pageCtx);
@@ -191,6 +239,9 @@ class PostListController {
                 view.addEventListener("removeRelation", (e) =>
                     this._evtRemoveRelation(e)
                 );
+                view.addEventListener("markForDeletion", (e) =>
+                    this._evtMarkForDeletion(e)
+                );
                 return view;
             },
             readPageFromCache: (rawPage) => PostList.fromResponse(rawPage),
diff --git a/client/js/controllers/post_main_controller.js b/client/js/controllers/post_main_controller.js
index d473788..7d6dcd3 100644
--- a/client/js/controllers/post_main_controller.js
+++ b/client/js/controllers/post_main_controller.js
@@ -160,22 +160,22 @@ class PostMainController extends BasePostController {
         this._view.sidebarControl.disableForm();
         this._view.sidebarControl.clearMessages();
         const post = e.detail.post;
-        if (e.detail.safety !== undefined) {
+        if (e.detail.safety !== undefined && e.detail.safety !== null) {
             post.safety = e.detail.safety;
         }
-        if (e.detail.flags !== undefined) {
+        if (e.detail.flags !== undefined && e.detail.flags !== null) {
             post.flags = e.detail.flags;
         }
-        if (e.detail.relations !== undefined) {
+        if (e.detail.relations !== undefined && e.detail.relations !== null) {
             post.relations = e.detail.relations;
         }
-        if (e.detail.content !== undefined) {
+        if (e.detail.content !== undefined && e.detail.content !== null) {
             post.newContent = e.detail.content;
         }
-        if (e.detail.thumbnail !== undefined) {
+        if (e.detail.thumbnail !== undefined && e.detail.thumbnail !== null) {
             post.newThumbnail = e.detail.thumbnail;
         }
-        if (e.detail.source !== undefined) {
+        if (e.detail.source !== undefined && e.detail.source !== null) {
             post.source = e.detail.source;
         }
         post.save().then(
diff --git a/client/js/controllers/post_upload_controller.js b/client/js/controllers/post_upload_controller.js
index 360dd4f..7ee63ac 100644
--- a/client/js/controllers/post_upload_controller.js
+++ b/client/js/controllers/post_upload_controller.js
@@ -13,7 +13,7 @@ const PostUploadView = require("../views/post_upload_view.js");
 const EmptyView = require("../views/empty_view.js");
 
 const genericErrorMessage =
-    "One of the posts needs your attention; " +
+    "One or more posts needs your attention; " +
     'click "resume upload" when you\'re ready.';
 
 class PostUploadController {
@@ -58,6 +58,7 @@ class PostUploadController {
         this._view.disableForm();
         this._view.clearMessages();
         const tagErrors = []; // to be displayed after all uploads
+        let anyFailures = false;
 
         e.detail.uploadables
             .reduce(
@@ -66,11 +67,45 @@ class PostUploadController {
                         this._uploadSinglePost(
                             uploadable,
                             e.detail.skipDuplicates,
-                            e.detail.copyTagsToOriginals
-                        )
+                            e.detail.copyTagsToOriginals,
+                            e.detail.alwaysUploadSimilar
+                        ).catch((error) => {
+                            anyFailures = true;
+                            if (error.uploadable) {
+                                if (error.similarPosts) {
+                                    error.uploadable.lookalikes =
+                                        error.similarPosts;
+                                    this._view.updateUploadable(
+                                        error.uploadable
+                                    );
+                                    this._view.showInfo(
+                                        error.message,
+                                        error.uploadable
+                                    );
+                                } else {
+                                    this._view.showError(
+                                        error.message,
+                                        error.uploadable
+                                    );
+                                }
+                            } else {
+                                this._view.showError(
+                                    error.message,
+                                    uploadable
+                                );
+                            }
+                            if (e.detail.pauseRemainOnError) {
+                                return Promise.reject();
+                            }
+                        })
                     ),
                 Promise.resolve()
             )
+            .then(() => {
+                if (anyFailures) {
+                    return Promise.reject();
+                }
+            })
             .then(
                 () => {
                     this._view.clearMessages();
@@ -82,31 +117,13 @@ class PostUploadController {
                     }
                 },
                 (error) => {
-                    if (error.uploadable) {
-                        if (error.similarPosts) {
-                            error.uploadable.lookalikes = error.similarPosts;
-                            this._view.updateUploadable(error.uploadable);
-                            this._view.showInfo(genericErrorMessage);
-                            this._view.showInfo(
-                                error.message,
-                                error.uploadable
-                            );
-                        } else {
-                            this._view.showError(genericErrorMessage);
-                            this._view.showError(
-                                error.message,
-                                error.uploadable
-                            );
-                        }
-                    } else {
-                        this._view.showError(error.message);
-                    }
+                    this._view.showError(genericErrorMessage);
                     this._view.enableForm();
                 }
             );
     }
 
-    _uploadSinglePost(uploadable, skipDuplicates, copyTagsToOriginals) {
+    _uploadSinglePost(uploadable, skipDuplicates, copyTagsToOriginals, alwaysUploadSimilar) {
         progress.start();
         let reverseSearchPromise = Promise.resolve();
         if (!uploadable.lookalikesConfirmed) {
@@ -145,7 +162,10 @@ class PostUploadController {
                     }
 
                     // notify about similar posts
-                    if (searchResult.similarPosts.length) {
+                    if (
+                        searchResult.similarPosts.length &&
+                        !alwaysUploadSimilar
+                    ) {
                         let error = new Error(
                             `Found ${searchResult.similarPosts.length} similar ` +
                                 "posts.\nYou can resume or discard this upload."
diff --git a/client/js/controllers/tag_controller.js b/client/js/controllers/tag_controller.js
index 326430b..b7e6ce3 100644
--- a/client/js/controllers/tag_controller.js
+++ b/client/js/controllers/tag_controller.js
@@ -105,13 +105,13 @@ class TagController {
     _evtUpdate(e) {
         this._view.clearMessages();
         this._view.disableForm();
-        if (e.detail.names !== undefined) {
+        if (e.detail.names !== undefined && e.detail.names !== null) {
             e.detail.tag.names = e.detail.names;
         }
-        if (e.detail.category !== undefined) {
+        if (e.detail.category !== undefined && e.detail.category !== null) {
             e.detail.tag.category = e.detail.category;
         }
-        if (e.detail.description !== undefined) {
+        if (e.detail.description !== undefined && e.detail.description !== null) {
             e.detail.tag.description = e.detail.description;
         }
         e.detail.tag.save().then(
diff --git a/client/js/controllers/user_controller.js b/client/js/controllers/user_controller.js
index 326736b..8cf4658 100644
--- a/client/js/controllers/user_controller.js
+++ b/client/js/controllers/user_controller.js
@@ -31,9 +31,8 @@ class UserController {
             userTokenPromise = UserToken.get(userName).then(
                 (userTokens) => {
                     return userTokens.map((token) => {
-                        token.isCurrentAuthToken = api.isCurrentAuthToken(
-                            token
-                        );
+                        token.isCurrentAuthToken =
+                            api.isCurrentAuthToken(token);
                         return token;
                     });
                 },
@@ -176,21 +175,21 @@ class UserController {
         const isLoggedIn = api.isLoggedIn(e.detail.user);
         const infix = isLoggedIn ? "self" : "any";
 
-        if (e.detail.name !== undefined) {
+        if (e.detail.name !== undefined && e.detail.name !== null) {
             e.detail.user.name = e.detail.name;
         }
-        if (e.detail.email !== undefined) {
+        if (e.detail.email !== undefined && e.detail.email !== null) {
             e.detail.user.email = e.detail.email;
         }
-        if (e.detail.rank !== undefined) {
+        if (e.detail.rank !== undefined && e.detail.rank !== null) {
             e.detail.user.rank = e.detail.rank;
         }
 
-        if (e.detail.password !== undefined) {
+        if (e.detail.password !== undefined && e.detail.password !== null) {
             e.detail.user.password = e.detail.password;
         }
 
-        if (e.detail.avatarStyle !== undefined) {
+        if (e.detail.avatarStyle !== undefined && e.detail.avatarStyle !== null) {
             e.detail.user.avatarStyle = e.detail.avatarStyle;
             if (e.detail.avatarContent) {
                 e.detail.user.avatarContent = e.detail.avatarContent;
@@ -303,7 +302,7 @@ class UserController {
         this._view.clearMessages();
         this._view.disableForm();
 
-        if (e.detail.note !== undefined) {
+        if (e.detail.note !== undefined && e.detail.note !== null) {
             e.detail.userToken.note = e.detail.note;
         }
 
diff --git a/client/js/controls/expander_control.js b/client/js/controls/expander_control.js
index c26bd03..f3105ca 100644
--- a/client/js/controls/expander_control.js
+++ b/client/js/controls/expander_control.js
@@ -49,9 +49,8 @@ class ExpanderControl {
     // eslint-disable-next-line accessor-pairs
     set title(newTitle) {
         if (this._expanderNode) {
-            this._expanderNode.querySelector(
-                "header span"
-            ).textContent = newTitle;
+            this._expanderNode.querySelector("header span").textContent =
+                newTitle;
         }
     }
 
diff --git a/client/js/controls/file_dropper_control.js b/client/js/controls/file_dropper_control.js
index 2dfb492..8d1fa16 100644
--- a/client/js/controls/file_dropper_control.js
+++ b/client/js/controls/file_dropper_control.js
@@ -48,6 +48,12 @@ class FileDropperControl extends events.EventTarget {
             this._urlInputNode.addEventListener("keydown", (e) =>
                 this._evtUrlInputKeyDown(e)
             );
+            this._urlInputNode.addEventListener("paste", (e) => {
+                // document.onpaste is used on the post-upload page.
+                // And this event is used on the post edit page.
+                if (document.getElementById("post-upload")) return;
+                this._evtPaste(e)
+            });
         }
         if (this._urlConfirmButtonNode) {
             this._urlConfirmButtonNode.addEventListener("click", (e) =>
@@ -55,6 +61,11 @@ class FileDropperControl extends events.EventTarget {
             );
         }
 
+        document.onpaste = (e) => {
+            if (!document.getElementById("post-upload")) return;
+            this._evtPaste(e)
+        }
+
         this._originalHtml = this._dropperNode.innerHTML;
         views.replaceContent(target, source);
     }
@@ -129,6 +140,17 @@ class FileDropperControl extends events.EventTarget {
         this._emitFiles(e.dataTransfer.files);
     }
 
+    _evtPaste(e) {
+        const items = (e.clipboardData || e.originalEvent.clipboardData).items;
+        const fileList = Array.from(items).map((x) => x.getAsFile()).filter(f => f);
+
+        if (!this._options.allowMultiple && fileList.length > 1) {
+            window.alert("Cannot select multiple files.");
+        } else if (fileList.length > 0) {
+            this._emitFiles(fileList);
+        }
+    }
+
     _evtUrlInputKeyDown(e) {
         if (e.which !== KEY_RETURN) {
             return;
diff --git a/client/js/controls/post_content_control.js b/client/js/controls/post_content_control.js
index 0023854..ed5e9a4 100644
--- a/client/js/controls/post_content_control.js
+++ b/client/js/controls/post_content_control.js
@@ -115,6 +115,30 @@ class PostContentControl {
     }
 
     _refreshSize() {
+        if (window.innerWidth <= 800) {
+            const buttons = document.querySelector(".sidebar > .buttons");
+            if (buttons) {
+                const content = document.querySelector(".content");
+                content.insertBefore(buttons, content.querySelector(".post-container + *"));
+
+                const afterControls = document.querySelector(".content > .after-mobile-controls");
+                if (afterControls) {
+                    afterControls.parentElement.parentElement.appendChild(afterControls);
+                }
+            }
+        } else {
+            const buttons = document.querySelector(".content > .buttons");
+            if (buttons) {
+                const sidebar = document.querySelector(".sidebar");
+                sidebar.insertBefore(buttons, sidebar.firstElementChild);
+            }
+
+            const afterControls = document.querySelector(".content + .after-mobile-controls");
+            if (afterControls) {
+                document.querySelector(".content").appendChild(afterControls);
+            }
+        }
+
         this._currentFitFunction();
     }
 
diff --git a/client/js/controls/post_edit_sidebar_control.js b/client/js/controls/post_edit_sidebar_control.js
index 053a317..a673495 100644
--- a/client/js/controls/post_edit_sidebar_control.js
+++ b/client/js/controls/post_edit_sidebar_control.js
@@ -221,9 +221,8 @@ class PostEditSidebarControl extends events.EventTarget {
         );
 
         if (this._formNode) {
-            const inputNodes = this._formNode.querySelectorAll(
-                "input, textarea"
-            );
+            const inputNodes =
+                this._formNode.querySelectorAll("input, textarea");
             for (let node of inputNodes) {
                 node.addEventListener("change", (e) =>
                     this.dispatchEvent(new CustomEvent("change"))
@@ -476,7 +475,7 @@ class PostEditSidebarControl extends events.EventTarget {
                         : undefined,
 
                     thumbnail:
-                        this._newPostThumbnail !== undefined
+                        this._newPostThumbnail !== undefined && this._newPostThumbnail !== null
                             ? this._newPostThumbnail
                             : undefined,
 
diff --git a/client/js/controls/post_notes_overlay_control.js b/client/js/controls/post_notes_overlay_control.js
index 030f7f2..e9aad04 100644
--- a/client/js/controls/post_notes_overlay_control.js
+++ b/client/js/controls/post_notes_overlay_control.js
@@ -727,9 +727,8 @@ class PostNotesOverlayControl extends events.EventTarget {
     }
 
     _showNoteText(note) {
-        this._textNode.querySelector(
-            ".wrapper"
-        ).innerHTML = misc.formatMarkdown(note.text);
+        this._textNode.querySelector(".wrapper").innerHTML =
+            misc.formatMarkdown(note.text);
         this._textNode.style.display = "block";
         const bodyRect = document.body.getBoundingClientRect();
         const noteRect = this._textNode.getBoundingClientRect();
diff --git a/client/js/controls/tag_input_control.js b/client/js/controls/tag_input_control.js
index 35bbe9f..0399d21 100644
--- a/client/js/controls/tag_input_control.js
+++ b/client/js/controls/tag_input_control.js
@@ -200,11 +200,9 @@ class TagInputControl extends events.EventTarget {
                 const listItemNode = this._createListItemNode(tag);
                 if (!tag.category) {
                     listItemNode.classList.add("new");
-                }
-                else if (source === SOURCE_IMPLICATION) {
+                } else if (source === SOURCE_IMPLICATION) {
                     listItemNode.classList.add("implication");
-                }
-                else {
+                } else {
                     listItemNode.classList.add("added");
                 }
                 this._tagListNode.prependChild(listItemNode);
diff --git a/client/js/main.js b/client/js/main.js
index 4f7436a..1d37865 100644
--- a/client/js/main.js
+++ b/client/js/main.js
@@ -4,12 +4,12 @@ const config = require("./config.js");
 
 if (config.environment == "development") {
     var ws = new WebSocket("ws://" + location.hostname + ":8080");
-    ws.addEventListener('open', function (event) {
+    ws.addEventListener("open", function (event) {
         console.log("Live-reloading websocket connected.");
     });
-    ws.addEventListener('message', (event) => {
+    ws.addEventListener("message", (event) => {
         console.log(event);
-        if (event.data == 'reload'){
+        if (event.data == "reload") {
             location.reload();
         }
     });
diff --git a/client/js/models/post.js b/client/js/models/post.js
index 1adaf5a..3df3b2c 100644
--- a/client/js/models/post.js
+++ b/client/js/models/post.js
@@ -296,7 +296,7 @@ class Post extends events.EventTarget {
         if (this._newContent) {
             files.content = this._newContent;
         }
-        if (this._newThumbnail !== undefined) {
+        if (this._newThumbnail !== undefined && this._newThumbnail !== null) {
             files.thumbnail = this._newThumbnail;
         }
         if (this._source !== this._orig._source) {
diff --git a/client/js/util/markdown.js b/client/js/util/markdown.js
index 22cdae5..e71e326 100644
--- a/client/js/util/markdown.js
+++ b/client/js/util/markdown.js
@@ -65,17 +65,6 @@ class TagPermalinkFixWrapper extends BaseMarkdownWrapper {
 // post, user and tags permalinks
 class EntityPermalinkWrapper extends BaseMarkdownWrapper {
     preprocess(text) {
-        // URL-based permalinks
-        text = text.replace(new RegExp("\\b/post/(\\d+)/?\\b", "g"), "@$1");
-        text = text.replace(
-            new RegExp("\\b/tag/([a-zA-Z0-9_-]+?)/?", "g"),
-            "#$1"
-        );
-        text = text.replace(
-            new RegExp("\\b/user/([a-zA-Z0-9_-]+?)/?", "g"),
-            "+$1"
-        );
-
         text = text.replace(
             /(^|^\(|(?:[^\]])\(|[\s<>\[\]\)])([+#@][a-zA-Z0-9_-]+)/g,
             "$1[$2]($2)"
@@ -136,12 +125,8 @@ function createRenderer() {
 
     const renderer = new marked.Renderer();
     renderer.image = (href, title, alt) => {
-        let [
-            _,
-            url,
-            width,
-            height,
-        ] = /^(.+?)(?:\s=\s*(\d*)\s*x\s*(\d*)\s*)?$/.exec(href);
+        let [_, url, width, height] =
+            /^(.+?)(?:\s=\s*(\d*)\s*x\s*(\d*)\s*)?$/.exec(href);
         let res = '<img src="' + sanitize(url) + '" alt="' + sanitize(alt);
         if (width) {
             res += '" width="' + width;
@@ -174,7 +159,7 @@ function formatMarkdown(text) {
     for (let wrapper of wrappers) {
         text = wrapper.preprocess(text);
     }
-    text = marked(text, options);
+    text = marked.parse(text, options);
     wrappers.reverse();
     for (let wrapper of wrappers) {
         text = wrapper.postprocess(text);
@@ -200,7 +185,7 @@ function formatInlineMarkdown(text) {
     for (let wrapper of wrappers) {
         text = wrapper.preprocess(text);
     }
-    text = marked.inlineLexer(text, [], options);
+    text = marked.parseInline(text, options);
     wrappers.reverse();
     for (let wrapper of wrappers) {
         text = wrapper.postprocess(text);
diff --git a/client/js/util/views.js b/client/js/util/views.js
index cc0614b..9958c87 100644
--- a/client/js/util/views.js
+++ b/client/js/util/views.js
@@ -231,13 +231,13 @@ function makePostLink(id, includeHash) {
 }
 
 function makeTagLink(name, includeHash, includeCount, tag) {
-    const category = tag ? tag.category : "unknown";
+    const category = tag && tag.category ? tag.category : "unknown";
     let text = misc.getPrettyName(name);
     if (includeHash === true) {
         text = "#" + text;
     }
     if (includeCount === true) {
-        text += " (" + (tag ? tag.postCount : 0) + ")";
+        text += " (" + (tag && tag.postCount ? tag.postCount : 0) + ")";
     }
     return api.hasPrivilege("tags:view")
         ? makeElement(
@@ -256,15 +256,15 @@ function makeTagLink(name, includeHash, includeCount, tag) {
 }
 
 function makePoolLink(id, includeHash, includeCount, pool, name) {
-    const category = pool ? pool.category : "unknown";
+    const category = pool && pool.category ? pool.category : "unknown";
     let text = misc.getPrettyName(
-        name ? name : pool ? pool.names[0] : "unknown"
+        name ? name : pool && pool.names ? pool.names[0] : "pool " + id
     );
     if (includeHash === true) {
         text = "#" + text;
     }
     if (includeCount === true) {
-        text += " (" + (pool ? pool.postCount : 0) + ")";
+        text += " (" + (pool && pool.postCount ? pool.postCount : 0) + ")";
     }
     return api.hasPrivilege("pools:view")
         ? makeElement(
@@ -286,7 +286,7 @@ function makeUserLink(user) {
     let text = makeThumbnail(user ? user.avatarUrl : null);
     text += user && user.name ? misc.escapeHtml(user.name) : "Anonymous";
     const link =
-        user && api.hasPrivilege("users:view")
+        user && user.name && api.hasPrivilege("users:view")
             ? makeElement(
                   "a",
                   { href: uri.formatClientLink("user", user.name) },
diff --git a/client/js/views/post_main_view.js b/client/js/views/post_main_view.js
index 36e3f9a..c6b312b 100644
--- a/client/js/views/post_main_view.js
+++ b/client/js/views/post_main_view.js
@@ -25,9 +25,8 @@ class PostMainView {
         views.replaceContent(this._hostNode, sourceNode);
         views.syncScrollPosition();
 
-        const topNavigationNode = document.body.querySelector(
-            "#top-navigation"
-        );
+        const topNavigationNode =
+            document.body.querySelector("#top-navigation");
 
         this._postContentControl = new PostContentControl(
             postContainerNode,
diff --git a/client/js/views/post_upload_view.js b/client/js/views/post_upload_view.js
index c83dd0a..83fdf12 100644
--- a/client/js/views/post_upload_view.js
+++ b/client/js/views/post_upload_view.js
@@ -1,6 +1,7 @@
 "use strict";
 
 const events = require("../events.js");
+const api = require("../api.js");
 const views = require("../util/views.js");
 const FileDropperControl = require("../controls/file_dropper_control.js");
 const TagList = require("../models/tag_list.js");
@@ -27,6 +28,7 @@ function _mimeTypeToPostType(mimeType) {
             "image/heic": "image",
             "video/mp4": "video",
             "video/webm": "video",
+            "video/quicktime": "video",
         }[mimeType] || "unknown"
     );
 }
@@ -40,7 +42,8 @@ class Uploadable extends events.EventTarget {
         this.flags = [];
         this.tags = [];
         this.relations = [];
-        this.anonymous = false;
+        this.anonymous = !api.isLoggedIn();
+        this.forceAnonymous = !api.isLoggedIn();
     }
 
     destroy() {}
@@ -124,6 +127,7 @@ class Url extends Uploadable {
             heif: "image/heif",
             heic: "image/heic",
             mp4: "video/mp4",
+            mov: "video/quicktime",
             webm: "video/webm",
         };
         for (let extension of Object.keys(mime)) {
@@ -309,7 +313,7 @@ class PostUploadView extends events.EventTarget {
         for (let uploadable of this._uploadables) {
             this._updateUploadableFromDom(uploadable);
         }
-        this._submitButtonNode.value = "Resume upload";
+        this._submitButtonNode.value = "Resume";
         this._emit("submit");
     }
 
@@ -396,6 +400,10 @@ class PostUploadView extends events.EventTarget {
                     skipDuplicates: this._skipDuplicatesCheckboxNode.checked,
                     copyTagsToOriginals:
                         this._copyTagsToOriginalsCheckboxNode.checked,
+                    alwaysUploadSimilar:
+                        this._alwaysUploadSimilarCheckboxNode.checked,
+                    pauseRemainOnError:
+                        this._pauseRemainOnErrorCheckboxNode.checked,
                 },
             })
         );
@@ -466,6 +474,18 @@ class PostUploadView extends events.EventTarget {
     get _copyTagsToOriginalsCheckboxNode() {
         return this._hostNode.querySelector("form [name=copy-tags-to-originals]");
     }
+    
+    get _alwaysUploadSimilarCheckboxNode() {
+        return this._hostNode.querySelector(
+            "form [name=always-upload-similar]"
+        );
+    }
+
+    get _pauseRemainOnErrorCheckboxNode() {
+        return this._hostNode.querySelector(
+            "form [name=pause-remain-on-error]"
+        );
+    }
 
     get _submitButtonNode() {
         return this._hostNode.querySelector("form [type=submit]");
diff --git a/client/js/views/posts_header_view.js b/client/js/views/posts_header_view.js
index 7f5acac..7923752 100644
--- a/client/js/views/posts_header_view.js
+++ b/client/js/views/posts_header_view.js
@@ -160,6 +160,34 @@ class BulkAddRelationEditor extends BulkEditor {
     }
 }
 
+class BulkDeleteEditor extends BulkEditor {
+    constructor(hostNode) {
+        super(hostNode);
+        this._hostNode.addEventListener("submit", (e) =>
+            this._evtFormSubmit(e)
+        );
+    }
+
+    _evtFormSubmit(e) {
+        e.preventDefault();
+        this.dispatchEvent(
+            new CustomEvent("deleteSelectedPosts", { detail: {} })
+        );
+    }
+
+    _evtOpenLinkClick(e) {
+        e.preventDefault();
+        this.toggleOpen(true);
+        this.dispatchEvent(new CustomEvent("open", { detail: {} }));
+    }
+
+    _evtCloseLinkClick(e) {
+        e.preventDefault();
+        this.toggleOpen(false);
+        this.dispatchEvent(new CustomEvent("close", { detail: {} }));
+    }
+}
+
 class PostsHeaderView extends events.EventTarget {
     constructor(ctx) {
         super();
@@ -247,6 +275,13 @@ class PostsHeaderView extends events.EventTarget {
                 this._evtCloseMetricsBtnClick(e)
             );
         }
+        
+        if (this._bulkEditDeleteNode) {
+            this._bulkDeleteEditor = new BulkDeleteEditor(
+                this._bulkEditDeleteNode
+            );
+            this._bulkEditors.push(this._bulkDeleteEditor);
+        }
 
         for (let editor of this._bulkEditors) {
             editor.addEventListener("submit", (e) => {
@@ -268,6 +303,8 @@ class PostsHeaderView extends events.EventTarget {
             this._openBulkEditor(this._bulkSafetyEditor);
         } else if (ctx.parameters.relations && this._bulkAddRelationEditor) {
             this._openBulkEditor(this._bulkAddRelationEditor);
+        } else if (ctx.parameters.delete && this._bulkDeleteEditor) {
+            this._openBulkEditor(this._bulkDeleteEditor);
         }
         if (ctx.parameters.metrics && this._metricsBlockNode) {
             this._toggleMetricsBlock(true);
@@ -322,6 +359,10 @@ class PostsHeaderView extends events.EventTarget {
         return this._hostNode.querySelector(".bulk-add-relation");
     }
 
+    get _bulkEditDeleteNode() {
+        return this._hostNode.querySelector(".bulk-edit-delete");
+    }
+
     get _metricsButtonHolderNode() {
         return this._hostNode.querySelector(".metrics-btn-holder");
     }
@@ -400,9 +441,8 @@ class PostsHeaderView extends events.EventTarget {
         e.target.classList.toggle("disabled");
         const safety = e.target.getAttribute("data-safety");
         let browsingSettings = settings.get();
-        browsingSettings.listPosts[safety] = !browsingSettings.listPosts[
-            safety
-        ];
+        browsingSettings.listPosts[safety] =
+            !browsingSettings.listPosts[safety];
         settings.save(browsingSettings, true);
         this.dispatchEvent(
             new CustomEvent("navigate", {
@@ -498,6 +538,10 @@ class PostsHeaderView extends events.EventTarget {
             this._bulkAddRelationEditor && this._bulkAddRelationEditor.opened
                 ? this._ctx.parameters.relations || " "
                 : null;
+        parameters.delete =
+            this._bulkDeleteEditor && this._bulkDeleteEditor.opened
+                ? "1"
+                : null;
         this.dispatchEvent(
             new CustomEvent("navigate", { detail: { parameters: parameters } })
         );
diff --git a/client/js/views/posts_page_view.js b/client/js/views/posts_page_view.js
index 9885602..463468a 100644
--- a/client/js/views/posts_page_view.js
+++ b/client/js/views/posts_page_view.js
@@ -47,6 +47,13 @@ class PostsPageView extends events.EventTarget {
                     );
                 }
             }
+
+            const deleteFlipperNode = this._getDeleteFlipperNode(listItemNode);
+            if (deleteFlipperNode) {
+                deleteFlipperNode.addEventListener("click", (e) =>
+                    this._evtBulkToggleDeleteClick(e, post)
+                );
+            }
         }
 
         this._syncBulkEditorsHighlights();
@@ -68,6 +75,10 @@ class PostsPageView extends events.EventTarget {
         return listItemNode.querySelector(".relation-flipper");
     }
 
+    _getDeleteFlipperNode(listItemNode) {
+        return listItemNode.querySelector(".delete-flipper");
+    }
+
     _evtPostChange(e) {
         const listItemNode = this._postIdToListItemNode[e.detail.post.id];
         for (let node of listItemNode.querySelectorAll("[data-disabled]")) {
@@ -128,6 +139,20 @@ class PostsPageView extends events.EventTarget {
         );
     }
 
+    _evtBulkToggleDeleteClick(e, post) {
+        e.preventDefault();
+        const linkNode = e.target;
+        linkNode.classList.toggle("delete");
+        this.dispatchEvent(
+            new CustomEvent("markForDeletion", {
+                detail: {
+                    post,
+                    delete: linkNode.classList.contains("delete"),
+                },
+            })
+        );
+    }
+
     _syncBulkEditorsHighlights() {
         for (let listItemNode of this._listItemNodes) {
             const postId = listItemNode.getAttribute("data-post-id");
@@ -159,6 +184,16 @@ class PostsPageView extends events.EventTarget {
                 let related = this._ctx.parameters.relations.includes(post.id);
                 relationFlipperNode.classList.toggle("related", related);
             }
+            
+            const deleteFlipperNode = this._getDeleteFlipperNode(listItemNode);
+            if (deleteFlipperNode) {
+                deleteFlipperNode.classList.toggle(
+                    "delete",
+                    this._ctx.bulkEdit.markedForDeletion.some(
+                        (x) => x.id == postId
+                    )
+                );
+            }
         }
     }
 }
diff --git a/client/js/views/user_tokens_view.js b/client/js/views/user_tokens_view.js
index 68707f0..9ba9e7c 100644
--- a/client/js/views/user_tokens_view.js
+++ b/client/js/views/user_tokens_view.js
@@ -72,9 +72,8 @@ class UserTokenView extends events.EventTarget {
 
     _evtDelete(e) {
         e.preventDefault();
-        const userToken = this._tokens[
-            parseInt(e.target.getAttribute("data-token-id"))
-        ];
+        const userToken =
+            this._tokens[parseInt(e.target.getAttribute("data-token-id"))];
         this.dispatchEvent(
             new CustomEvent("delete", {
                 detail: {
@@ -110,9 +109,8 @@ class UserTokenView extends events.EventTarget {
 
     _evtChangeNoteClick(e) {
         e.preventDefault();
-        const userToken = this._tokens[
-            parseInt(e.target.getAttribute("data-token-id"))
-        ];
+        const userToken =
+            this._tokens[parseInt(e.target.getAttribute("data-token-id"))];
         const text = window.prompt(
             "Please enter the new name:",
             userToken.note !== null ? userToken.note : undefined
diff --git a/client/package-lock.json b/client/package-lock.json
index d327ac6..f1f4a99 100644
--- a/client/package-lock.json
+++ b/client/package-lock.json
@@ -1,7 +1,4605 @@
 {
   "name": "szurubooru",
   "requires": true,
-  "lockfileVersion": 1,
+  "packages": {
+    "": {
+      "name": "szurubooru",
+      "dependencies": {
+        "dompurify": "^2.0.17",
+        "font-awesome": "^4.7.0",
+        "ios-inner-height": "^1.0.3",
+        "js-cookie": "^2.2.0",
+        "marked": "^4.0.10",
+        "mousetrap": "^1.6.2",
+        "nprogress": "^0.2.0",
+        "superagent": "^3.8.3"
+      },
+      "devDependencies": {
+        "babel-core": "^6.26.3",
+        "babel-polyfill": "^6.26.0",
+        "babel-preset-env": "^1.7.0",
+        "babelify": "^8.0.0",
+        "browserify": "^16.2.2",
+        "chokidar": "^3.5.1",
+        "csso": "^3.5.1",
+        "glob": "^7.1.2",
+        "html-minifier": "^3.5.18",
+        "jimp": "^0.13.0",
+        "pretty-error": "^3.0.3",
+        "stylus": "^0.54.8",
+        "terser": "^4.8.1",
+        "underscore": "^1.12.1",
+        "watchify": "^4.0.0",
+        "ws": "^7.4.6"
+      }
+    },
+    "node_modules/@babel/runtime": {
+      "version": "7.10.3",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.10.3.tgz",
+      "integrity": "sha512-RzGO0RLSdokm9Ipe/YD+7ww8X2Ro79qiXZF3HU9ljrM+qnJmH1Vqth+hbiQZy761LnMJTMitHDuKVYTk3k4dLw==",
+      "dev": true,
+      "dependencies": {
+        "regenerator-runtime": "^0.13.4"
+      }
+    },
+    "node_modules/@babel/runtime/node_modules/regenerator-runtime": {
+      "version": "0.13.5",
+      "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.5.tgz",
+      "integrity": "sha512-ZS5w8CpKFinUzOwW3c83oPeVXoNsrLsaCoLtJvAClH135j/R77RuymhiSErhm2lKcwSCIpmvIWSbDkIfAqKQlA==",
+      "dev": true
+    },
+    "node_modules/@jimp/bmp": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/bmp/-/bmp-0.13.0.tgz",
+      "integrity": "sha512-7i/XZLoK5JETBKO0VL7qjnr6WDVl1X8mmaUk6Lzq06/veMPC5IwUIZi1JRVAXPEwTf5uUegq0WFnmUS0lVYzFw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0",
+        "bmp-js": "^0.1.0"
+      }
+    },
+    "node_modules/@jimp/core": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/core/-/core-0.13.0.tgz",
+      "integrity": "sha512-BMFEUm5HbRP4yCo4Q23CJFx/v6Yr3trw7rERmS1GKUEooDq9ktApZWWTvWq/vggKyysKX0nQ+KT+FaFD/75Q+Q==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0",
+        "any-base": "^1.1.0",
+        "buffer": "^5.2.0",
+        "exif-parser": "^0.1.12",
+        "file-type": "^9.0.0",
+        "load-bmfont": "^1.3.1",
+        "mkdirp": "^0.5.1",
+        "phin": "^2.9.1",
+        "pixelmatch": "^4.0.2",
+        "tinycolor2": "^1.4.1"
+      }
+    },
+    "node_modules/@jimp/custom": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/custom/-/custom-0.13.0.tgz",
+      "integrity": "sha512-Zir/CHoLRhQDGfPWueCIQbVjVUlayNIUch9fulq4M9V2S+ynHx9BqRn58z8wy+mk8jm1WlpRVhvZ8QUenbL0vg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/core": "^0.13.0"
+      }
+    },
+    "node_modules/@jimp/gif": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/gif/-/gif-0.13.0.tgz",
+      "integrity": "sha512-7FO2Fa9FZluqGt1MM/L8s6P5UEedxrIQT2eBAxzB8Z82YTTSWQXw4bdrZWCwiQjBFZwKTIaULIfw6+TxA/Q2XA==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0",
+        "gifwrap": "^0.9.2",
+        "omggif": "^1.0.9"
+      }
+    },
+    "node_modules/@jimp/jpeg": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/jpeg/-/jpeg-0.13.0.tgz",
+      "integrity": "sha512-Fol/DxA1lnIzCsNx/CckIEoyWImQHiWPgFAWL5s7VIVaJrEFnnbRqfOxmvr8yWg8mh3hWLeXNcxqA82CKXgg+Q==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0",
+        "jpeg-js": "^0.4.0"
+      }
+    },
+    "node_modules/@jimp/plugin-blit": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/plugin-blit/-/plugin-blit-0.13.0.tgz",
+      "integrity": "sha512-roCShFZosJgRMLCLzuOT1pRZysQF/p3avQieZiu9pfg2F9X09f91OauU2Lf3/yOp0TZCWbheqbem9MPlhyED8w==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0"
+      }
+    },
+    "node_modules/@jimp/plugin-blur": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/plugin-blur/-/plugin-blur-0.13.0.tgz",
+      "integrity": "sha512-LeBhQe72bRk2fe2AftcqcDaWgSu6vFD0fxiAYYMy3pHa8pnPAwnw2W3u4bV/gc5XJt6AJzoRyc7WVG2pE4A3gg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0"
+      }
+    },
+    "node_modules/@jimp/plugin-circle": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/plugin-circle/-/plugin-circle-0.13.0.tgz",
+      "integrity": "sha512-INwIl8zgWnJYXxYkNhIjG8TXg2Q1nh008SDKyC+Pug4ce/XRJC8w/Gk6HS+U9Z2tIO2/zXv473k/JaiwvDMu1w==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0"
+      }
+    },
+    "node_modules/@jimp/plugin-color": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/plugin-color/-/plugin-color-0.13.0.tgz",
+      "integrity": "sha512-e71UDivZdZGOhQRLjDo4a0BKgrH858HJ7zFk7/Yti58LwgeIGjYHhuYc+xQOdnBWPzGSD47TuFX5GXmf/x1nmg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0",
+        "tinycolor2": "^1.4.1"
+      }
+    },
+    "node_modules/@jimp/plugin-contain": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/plugin-contain/-/plugin-contain-0.13.0.tgz",
+      "integrity": "sha512-qPYS+ccMP4mEnf7BB0bcaszUTth8OxeRX0MdMvU6PDEI0nIvVVNwmuI6YtNqqs12PwuYxgPkq6AFenyLyoNP1g==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0"
+      }
+    },
+    "node_modules/@jimp/plugin-cover": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/plugin-cover/-/plugin-cover-0.13.0.tgz",
+      "integrity": "sha512-S2GkbXNgIb0afof/NLLq9IJDZPOcFtu1mc32ngt9S8HzXsNHgRAzONW7cg56bwQ6p0+sz/dS5tB4ctOW/pu/Dw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0"
+      }
+    },
+    "node_modules/@jimp/plugin-crop": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/plugin-crop/-/plugin-crop-0.13.0.tgz",
+      "integrity": "sha512-Y1Ug3kOzsq72EjLiWQlwkHuvUvdSmFUDtxpyOXh3RxeWF7wmdjH8FvdhPj8hWvFLsDYFgWGaLI4Z6SXOr+N8nA==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0"
+      }
+    },
+    "node_modules/@jimp/plugin-displace": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/plugin-displace/-/plugin-displace-0.13.0.tgz",
+      "integrity": "sha512-c80VIUjIqQoavafthLpYRZdzANCxbOCHzqkFVbZ0kNKJnDDk6fW55mvVW4TJLDToDU81WMlttCmNV0oXcX93gQ==",
+      "dev": true,
+      "dependencies": {
+        "@babel/runtime": "^7.7.2",
+        "@jimp/utils": "^0.13.0"
+      }
+    },
+    "node_modules/@jimp/plugin-dither": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@jimp/plugin-dither/-/plugin-dither-0.13.0.tgz",
+      "integrity": "sha512-EUz/y/AaQ00TnaiVLVAXLz8n8Nx7S36lKi4VXPeYy5a5FyzBimxNiKxdITVe9zooN7+H4FP++/xGFGFMpfWtRg==",
+      "dev": true,
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     "call-bind": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.2.tgz",
       "integrity": "sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==",
-      "dev": true,
       "requires": {
         "function-bind": "^1.1.1",
         "get-intrinsic": "^1.0.2"
@@ -1610,9 +6189,9 @@
       "dev": true
     },
     "cookiejar": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.2.tgz",
-      "integrity": "sha512-Mw+adcfzPxcPeI+0WlvRrr/3lGVO0bD75SxX6811cxSh1Wbxx7xZBGK1eVtDf6si8rg2lhnUjsVLMFMfbRIuwA=="
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.4.tgz",
+      "integrity": "sha512-LDx6oHrK+PhzLKJU9j5S7/Y3jM/mUHvD/DeI1WQmJn652iPC5Y4TBzC9l+5OMOXlyTTA+SmVUPm0HQUwpD5Jqw=="
     },
     "core-js": {
       "version": "2.5.7",
@@ -1762,9 +6341,9 @@
       }
     },
     "decode-uri-component": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
-      "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.2.tgz",
+      "integrity": "sha512-FqUYQ+8o158GyGTrMFJms9qh3CqTKvAqgqsTnkLI8sKu0028orqBhxNMFkFen0zGyg6epACD32pjVk58ngIErQ==",
       "dev": true
     },
     "define-properties": {
@@ -2091,8 +6670,7 @@
     "function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
-      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
-      "dev": true
+      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A=="
     },
     "get-assigned-identifiers": {
       "version": "1.2.0",
@@ -2104,7 +6682,6 @@
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.1.1.tgz",
       "integrity": "sha512-kWZrnVM42QCiEA2Ig1bG8zjoIMOgxWwYCEeNdwY6Tv/cOSeGpcoX4pXHfKUxNKVoArnrEr2e9srnAxxGIraS9Q==",
-      "dev": true,
       "requires": {
         "function-bind": "^1.1.1",
         "has": "^1.0.3",
@@ -2172,7 +6749,6 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
       "integrity": "sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==",
-      "dev": true,
       "requires": {
         "function-bind": "^1.1.1"
       }
@@ -2195,8 +6771,7 @@
     "has-symbols": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.2.tgz",
-      "integrity": "sha512-chXa79rL/UC2KlX17jo3vRGz0azaWEx5tGqZg5pO3NUyEJVB17dMruQlzCCOfUvElghKcm5194+BCRvi2Rv/Gw==",
-      "dev": true
+      "integrity": "sha512-chXa79rL/UC2KlX17jo3vRGz0azaWEx5tGqZg5pO3NUyEJVB17dMruQlzCCOfUvElghKcm5194+BCRvi2Rv/Gw=="
     },
     "hash-base": {
       "version": "3.0.4",
@@ -2552,9 +7127,9 @@
       }
     },
     "jpeg-js": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/jpeg-js/-/jpeg-js-0.4.0.tgz",
-      "integrity": "sha512-960VHmtN1vTpasX/1LupLohdP5odwAT7oK/VSm6mW0M58LbrBnowLAPWAZhWGhDAGjzbMnPXZxzB/QYgBwkN0w==",
+      "version": "0.4.4",
+      "resolved": "https://registry.npmjs.org/jpeg-js/-/jpeg-js-0.4.4.tgz",
+      "integrity": "sha512-WZzeDOEtTOBK4Mdsar0IqEU5sMr3vSV2RqkAIzUEV2BHnUfKGyswWFPFwK5EeDo93K3FohSHbLAjj0s1Wzd+dg==",
       "dev": true
     },
     "js-cookie": {
@@ -2664,9 +7239,9 @@
       "dev": true
     },
     "marked": {
-      "version": "0.7.0",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-0.7.0.tgz",
-      "integrity": "sha512-c+yYdCZJQrsRjTPhUx7VKkApw9bwDkNbHUKo1ovgcfDjb2kc8rLuRbIFyXL5WOEUwzSSKo3IXpph2K6DqB/KZg=="
+      "version": "4.0.10",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-4.0.10.tgz",
+      "integrity": "sha512-+QvuFj0nGgO970fySghXGmuw+Fd0gD2x3+MqCWLIPf5oxdv1Ka6b2q+z9RP01P/IaKPMEramy+7cNy/Lw8c3hw=="
     },
     "md5.js": {
       "version": "1.3.4",
@@ -2748,9 +7323,9 @@
       }
     },
     "minimist": {
-      "version": "1.2.5",
-      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
-      "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.6.tgz",
+      "integrity": "sha512-Jsjnk4bw3YJqYzbdyBiNsPWHPfO++UGG749Cxs6peCu5Xg4nrena6OVxOYxrQTqww0Jmwt+Ref8rggumkTLz9Q==",
       "dev": true
     },
     "mkdirp": {
@@ -2850,8 +7425,7 @@
     "object-inspect": {
       "version": "1.10.3",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.10.3.tgz",
-      "integrity": "sha512-e5mCJlSH7poANfC8z8S9s9S2IN5/4Zb3aZ33f5s8YqoazCFzNLloLU8r5VCG+G7WoqLvAAZoVMcy3tp/3X0Plw==",
-      "dev": true
+      "integrity": "sha512-e5mCJlSH7poANfC8z8S9s9S2IN5/4Zb3aZ33f5s8YqoazCFzNLloLU8r5VCG+G7WoqLvAAZoVMcy3tp/3X0Plw=="
     },
     "object-keys": {
       "version": "1.1.1",
@@ -2991,9 +7565,9 @@
       "dev": true
     },
     "path-parse": {
-      "version": "1.0.6",
-      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
-      "integrity": "sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw==",
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.7.tgz",
+      "integrity": "sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==",
       "dev": true
     },
     "path-platform": {
@@ -3089,9 +7663,12 @@
       "dev": true
     },
     "qs": {
-      "version": "6.5.2",
-      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
-      "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA=="
+      "version": "6.11.0",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.0.tgz",
+      "integrity": "sha512-MvjoMCJwEarSbUYk5O+nmoSzSutSsTwF85zcHPQ9OrlFoZOYIjaqBAJIqIXjptyD5vThxGq52Xu/MaJzRkIk4Q==",
+      "requires": {
+        "side-channel": "^1.0.4"
+      }
     },
     "querystring": {
       "version": "0.2.0",
@@ -3320,15 +7897,19 @@
       }
     },
     "shell-quote": {
-      "version": "1.6.1",
-      "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.6.1.tgz",
-      "integrity": "sha1-9HgZSczkAmlxJ0MOo7PFR29IF2c=",
-      "dev": true,
+      "version": "1.7.3",
+      "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.7.3.tgz",
+      "integrity": "sha512-Vpfqwm4EnqGdlsBFNmHhxhElJYrdfcxPThu+ryKS5J8L/fhAwLazFZtq+S+TWZ9ANj2piSQLGj6NQg+lKPmxrw==",
+      "dev": true
+    },
+    "side-channel": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.4.tgz",
+      "integrity": "sha512-q5XPytqFEIKHkGdiMIrY10mvLRvnQh42/+GoBlFW3b2LXLE2xxJpZFdm94we0BaoV3RwJyGqg5wS7epxTv0Zvw==",
       "requires": {
-        "array-filter": "~0.0.0",
-        "array-map": "~0.0.0",
-        "array-reduce": "~0.0.0",
-        "jsonify": "~0.0.0"
+        "call-bind": "^1.0.0",
+        "get-intrinsic": "^1.0.2",
+        "object-inspect": "^1.9.0"
       }
     },
     "simple-concat": {
@@ -3500,14 +8081,6 @@
       "dev": true,
       "requires": {
         "minimist": "^1.1.0"
-      },
-      "dependencies": {
-        "minimist": {
-          "version": "1.2.5",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
-          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
-          "dev": true
-        }
       }
     },
     "superagent": {
@@ -3543,20 +8116,20 @@
       }
     },
     "terser": {
-      "version": "3.7.7",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-3.7.7.tgz",
-      "integrity": "sha512-RRLIxE7S52vSOI9cEbOaisgBd2y6MNgfg2ihUkidsFnuP1eDmZ79+lBWbyvgfFTAc/r8nSjL0k3cpZDDIYiYiA==",
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-4.8.1.tgz",
+      "integrity": "sha512-4GnLC0x667eJG0ewJTa6z/yXrbLGv80D9Ru6HIpCQmO+Q4PfEtBFi0ObSckqwL6VyQv/7ENJieXHo2ANmdQwgw==",
       "dev": true,
       "requires": {
-        "commander": "~2.14.1",
+        "commander": "^2.20.0",
         "source-map": "~0.6.1",
-        "source-map-support": "~0.5.6"
+        "source-map-support": "~0.5.12"
       },
       "dependencies": {
         "commander": {
-          "version": "2.14.1",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.14.1.tgz",
-          "integrity": "sha512-+YR16o3rK53SmWHU3rEM3tPAh2rwb1yPcQX5irVn7mb0gXbwuCCrnkbV5+PBfETdfg1vui07nM6PCG1zndcjQw==",
+          "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
         },
         "source-map": {
@@ -3566,9 +8139,9 @@
           "dev": true
         },
         "source-map-support": {
-          "version": "0.5.6",
-          "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.6.tgz",
-          "integrity": "sha512-N4KXEz7jcKqPf2b2vZF11lQIz9W5ZMuUcIOGj243lduidkf2fjkVKJS9vNxVWn3u/uxX38AcE8U9nnH9FPcq+g==",
+          "version": "0.5.21",
+          "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.21.tgz",
+          "integrity": "sha512-uBHU3L3czsIyYXKX88fdrGovxdSCoTGDRZ6SYXtSRxLZUzHg5P/66Ht6uoUlHu9EZod+inXhKo3qQgwXUT/y1w==",
           "dev": true,
           "requires": {
             "buffer-from": "^1.0.0",
diff --git a/client/package.json b/client/package.json
index cb1f5e0..6daba6b 100644
--- a/client/package.json
+++ b/client/package.json
@@ -3,14 +3,15 @@
   "private": true,
   "scripts": {
     "build": "node build.js",
-    "watch": "node build.js --watch"
+    "watch": "node build.js --watch",
+    "build-container": "docker build -t szurubooru/client:dev ."
   },
   "dependencies": {
     "dompurify": "^2.0.17",
     "@fortawesome/fontawesome-free": "^5.1.0",
     "ios-inner-height": "^1.0.3",
     "js-cookie": "^2.2.0",
-    "marked": "^0.7.0",
+    "marked": "^4.0.10",
     "mousetrap": "^1.6.2",
     "nprogress": "^0.2.0",
     "superagent": "^3.8.3"
@@ -28,7 +29,7 @@
     "jimp": "^0.13.0",
     "pretty-error": "^3.0.3",
     "stylus": "^0.54.8",
-    "terser": "^3.7.7",
+    "terser": "^4.8.1",
     "underscore": "^1.12.1",
     "watchify": "^4.0.0",
     "ws": "^7.4.6"
diff --git a/doc/API.md b/doc/API.md
index 3d280fd..70c495a 100644
--- a/doc/API.md
+++ b/doc/API.md
@@ -37,6 +37,7 @@
         - [Creating post](#creating-post)
         - [Updating post](#updating-post)
         - [Getting post](#getting-post)
+        - [Getting around post](#getting-around-post)
         - [Deleting post](#deleting-post)
         - [Merging posts](#merging-posts)
         - [Rating post](#rating-post)
@@ -53,7 +54,7 @@
         - [Deleting pool category](#deleting-pool-category)
         - [Setting default pool category](#setting-default-pool-category)
     - Pools
-        - [Listing pools](#listing-pool)
+        - [Listing pools](#listing-pools)
         - [Creating pool](#creating-pool)
         - [Updating pool](#updating-pool)
         - [Getting pool](#getting-pool)
@@ -164,9 +165,9 @@ way. The files, however, should be passed as regular fields appended with a
 accepts a file named `content`, the client should pass
 `{"contentUrl":"http://example.com/file.jpg"}` as a part of the JSON message
 body. When creating or updating post content using this method, the server can
-also be configured to employ [youtube-dl](https://github.com/ytdl-org/youtube-dl)
-to download content from popular sites such as youtube, gfycat, etc. Access to
-youtube-dl can be configured with the `'uploads:use_downloader'` permission
+also be configured to employ [yt-dlp](https://github.com/yt-dlp/yt-dlp) to
+download content from popular sites such as youtube, gfycat, etc. Access to
+yt-dlp can be configured with the `'uploads:use_downloader'` permission
 
 Finally, in some cases the user might want to reuse one file between the
 requests to save the bandwidth (for example, reverse search + consecutive
@@ -322,7 +323,7 @@ data.
     {
         "name":  <name>,
         "color": <color>,
-        "order": <order>  // optional
+        "order": <order>
     }
     ```
 
@@ -788,7 +789,7 @@ data.
     | `fav-time`           | alias of `fav-date`                                                                                                                     |
     | `feature-date`       | featured at given date                                                                                                                  |
     | `feature-time`       | alias of `feature-time`                                                                                                                 |
-    | `safety`             | having given safety. `<value>` can be either `safe`, `sketchy` (or `questionable`) or `unsafe`.                                         |
+    | `safety`             | having given safety. `<value>` can be either `safe`, `sketchy` or `unsafe`.                                         |
     | `rating`             | alias of `safety`                                                                                                                       |
 
     **Sort style tokens**
@@ -951,6 +952,29 @@ data.
 
     Retrieves information about an existing post.
 
+## Getting around post
+- **Request**
+
+    `GET /post/<id>/around`
+
+- **Output**
+
+    ```json5
+    {
+        "prev":  <post-resource>,
+        "next":  <post-resource>
+    }
+    ```
+
+- **Errors**
+
+    - the post does not exist
+    - privileges are too low
+
+- **Description**
+
+    Retrieves information about posts that are before or after an existing post.
+
 ## Deleting post
 - **Request**
 
@@ -1365,7 +1389,7 @@ data.
 ## Creating pool
 - **Request**
 
-    `POST /pools/create`
+    `POST /pool`
 
 - **Input**
 
@@ -2467,7 +2491,7 @@ One file together with its metadata posted to the site.
 ## Micro post
 **Description**
 
-A [post resource](#post) stripped down to `name` and `thumbnailUrl` fields.
+A [post resource](#post) stripped down to `id` and `thumbnailUrl` fields.
 
 ## Note
 **Description**
diff --git a/doc/INSTALL.md b/doc/INSTALL.md
index d978e4a..a1598b8 100644
--- a/doc/INSTALL.md
+++ b/doc/INSTALL.md
@@ -1,5 +1,5 @@
-This assumes that you have Docker (version 17.05 or greater)
-and Docker Compose (version 1.6.0 or greater) already installed.
+This assumes that you have Docker (version 19.03 or greater)
+and the Docker Compose CLI (version 1.27.0 or greater) already installed.
 
 ### Prepare things
 
@@ -34,33 +34,79 @@ and Docker Compose (version 1.6.0 or greater) already installed.
     Read the comments to guide you. Note that `.env` should be in the root
     directory of this repository.
 
-### Running the Application
+4. Pull the containers:
 
-Download containers:
-```console
-user@host:szuru$ docker-compose pull
-```
+    This pulls the latest containers from docker.io:
+    ```console
+    user@host:szuru$ docker compose pull
+    ```
+
+    If you have modified the application's source and would like to manually
+    build it, follow the instructions in [**Building**](#Building) instead,
+    then read here once you're done.
+
+5. Run it!
+
+    For first run, it is recommended to start the database separately:
+    ```console
+    user@host:szuru$ docker compose up -d sql
+    ```
+
+    To start all containers:
+    ```console
+    user@host:szuru$ docker compose up -d
+    ```
+
+    To view/monitor the application logs:
+    ```console
+    user@host:szuru$ docker compose logs -f
+    # (CTRL+C to exit)
+    ```
+
+### Building
+
+1. Edit `docker-compose.yml` to tell Docker to build instead of pull containers:
 
-For first run, it is recommended to start the database separately:
-```console
-user@host:szuru$ docker-compose up -d sql
-```
+    ```diff yaml
+    ...
+    server:
+    - image: szurubooru/server:latest
+    + build: server
+    ...
+    client:
+    - image: szurubooru/client:latest
+    + build: client
+    ...
+    ```
+
+    You can choose to build either one from source.
+
+2. Build the containers:
+
+    ```console
+    user@host:szuru$ docker compose build
+    ```
+
+    That will attempt to build both containers, but you can specify `client`
+    or `server` to make it build only one.
+
+    If `docker compose build` spits out:
+
+    ```
+    ERROR: Service 'server' failed to build: failed to parse platform : "" is an invalid component of "": platform specifier component must match "^[A-Za-z0-9_-]+$": invalid argument
+    ```
+
+    ...you will need to export Docker BuildKit flags:
+
+    ```console
+    user@host:szuru$ export DOCKER_BUILDKIT=1; export COMPOSE_DOCKER_CLI_BUILD=1
+    ```
 
-To start all containers:
-```console
-user@host:szuru$ docker-compose up -d
-```
+    ...and run `docker compose build` again.
 
-To view/monitor the application logs:
-```console
-user@host:szuru$ docker-compose logs -f
-# (CTRL+C to exit)
-```
+*Note: If your changes are not taking effect in your builds, consider building
+with `--no-cache`.*
 
-To stop all containers:
-```console
-user@host:szuru$ docker-compose down
-```
 
 ### Additional Features
 
@@ -71,7 +117,7 @@ user@host:szuru$ docker-compose down
     run from docker:
 
     ```console
-    user@host:szuru$ docker-compose run server ./szuru-admin --help
+    user@host:szuru$ docker compose run server ./szuru-admin --help
     ```
 
     will give you a breakdown on all available commands.
diff --git a/doc/example.env b/doc/example.env
index 59e1e85..303a25e 100644
--- a/doc/example.env
+++ b/doc/example.env
@@ -10,6 +10,12 @@ BUILD_INFO=latest
 # otherwise the port specified here will be publicly accessible
 PORT=8080
 
+# How many waitress threads to start
+# 4 is the default amount of threads. If you experience performance
+# degradation with a large number of posts, increasing this may
+# improve performance, since waitress is most likely clogging up with Tasks.
+THREADS=4
+
 # URL base to run szurubooru under
 # See "Additional Features" section in INSTALL.md
 BASE_URL=/
diff --git a/docker-compose.yml b/docker-compose.yml
index 0e362d9..dc7ca69 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,9 +1,7 @@
 ## Example Docker Compose configuration
 ##
-## Use this as a template to set up docker-compose, or as guide to set up other
+## Use this as a template to set up docker compose, or as guide to set up other
 ## orchestration services
-version: '2'
-
 services:
 
   server:
@@ -23,6 +21,7 @@ services:
       #POSTGRES_DB: defaults to same as POSTGRES_USER
       #POSTGRES_PORT: 5432
       #LOG_SQL: 0 (1 for verbose SQL logs)
+      THREADS:
     volumes:
       - "${MOUNT_DATA}:/data"
       - "./server/config.yaml:/opt/app/config.yaml"
diff --git a/server/Dockerfile b/server/Dockerfile
index 4beec1c..3e4dadf 100644
--- a/server/Dockerfile
+++ b/server/Dockerfile
@@ -7,8 +7,13 @@ WORKDIR /opt/app
 RUN apk --no-cache add \
         python3 \
         python3-dev \
-        ffmpeg \
         py3-pip \
+        build-base \
+        libheif \
+        libheif-dev \
+        libavif \
+        libavif-dev \
+        ffmpeg \
         # from requirements.txt:
         py3-yaml \
         py3-psycopg2 \
@@ -18,26 +23,21 @@ RUN apk --no-cache add \
         py3-pillow \
         py3-pynacl \
         py3-tz \
-        py3-pyrfc3339 \
-        build-base \
- && apk --no-cache add \
-        libheif \
-        libavif \
-        libheif-dev \
-        libavif-dev \
- && pip3 install --no-cache-dir --disable-pip-version-check \
-        alembic \
+        py3-pyrfc3339
+RUN pip3 install --no-cache-dir --disable-pip-version-check \
+        "alembic>=0.8.5" \
         "coloredlogs==5.0" \
-        youtube_dl \
-        pillow-avif-plugin \
-        pyheif-pillow-opener \
- && apk --no-cache del py3-pip
+        "pyheif==0.6.1" \
+        "heif-image-plugin>=0.3.2" \
+        yt-dlp \
+        "pillow-avif-plugin~=1.1.0"
+RUN apk --no-cache del py3-pip
 
 COPY ./ /opt/app/
 RUN rm -rf /opt/app/szurubooru/tests
 
 
-FROM prereqs as testing
+FROM --platform=$BUILDPLATFORM prereqs as testing
 WORKDIR /opt/app
 
 RUN apk --no-cache add \
@@ -83,6 +83,9 @@ ARG PORT=6666
 ENV PORT=${PORT}
 EXPOSE ${PORT}
 
+ARG THREADS=4
+ENV THREADS=${THREADS}
+
 VOLUME ["/data/"]
 
 ARG DOCKER_REPO
diff --git a/server/config.yaml.dist b/server/config.yaml.dist
index 3a17e38..5dddd72 100644
--- a/server/config.yaml.dist
+++ b/server/config.yaml.dist
@@ -116,6 +116,7 @@ privileges:
     'posts:bulk-edit:tags':         power
     'posts:bulk-edit:safety':       power
     'posts:view:similar':           regular
+    'posts:bulk-edit:delete':       power
 
     'tags:create':                  regular
     'tags:edit:names':              power
diff --git a/server/docker-start.sh b/server/docker-start.sh
index 34a0e49..eebef1c 100755
--- a/server/docker-start.sh
+++ b/server/docker-start.sh
@@ -4,5 +4,5 @@ cd /opt/app
 
 alembic upgrade head
 
-echo "Starting szurubooru API on port ${PORT}"
-exec waitress-serve-3 --port ${PORT} szurubooru.facade:app
+echo "Starting szurubooru API on port ${PORT} - Running on ${THREADS} threads"
+exec waitress-serve-3 --port ${PORT} --threads ${THREADS} szurubooru.facade:app
diff --git a/server/hooks/build b/server/hooks/build
deleted file mode 100755
index b5e914b..0000000
--- a/server/hooks/build
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/sh
-
-docker build \
-    --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') \
-    --build-arg SOURCE_COMMIT \
-    --build-arg DOCKER_REPO \
-    -f $DOCKERFILE_PATH -t $IMAGE_NAME .
diff --git a/server/hooks/post_push b/server/hooks/post_push
deleted file mode 100755
index 1b1e0ad..0000000
--- a/server/hooks/post_push
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/bin/sh
-
-add_tag() {
-    echo "Also tagging image as ${DOCKER_REPO}:${1}"
-    docker tag $IMAGE_NAME $DOCKER_REPO:$1
-    docker push $DOCKER_REPO:$1
-}
-
-CLOSEST_VER=$(git describe --tags --abbrev=0)
-CLOSEST_MAJOR_VER=$(echo ${CLOSEST_VER} | cut -d'.' -f1)
-CLOSEST_MINOR_VER=$(echo ${CLOSEST_VER} | cut -d'.' -f2)
-
-add_tag "${CLOSEST_MAJOR_VER}-edge"
-add_tag "${CLOSEST_MAJOR_VER}.${CLOSEST_MINOR_VER}-edge"
-
-if git describe --exact-match --abbrev=0 2> /dev/null; then
-    add_tag "${CLOSEST_MAJOR_VER}"
-    add_tag "${CLOSEST_MAJOR_VER}.${CLOSEST_MINOR_VER}"
-fi
diff --git a/server/hooks/test b/server/hooks/test
deleted file mode 100755
index b325186..0000000
--- a/server/hooks/test
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/bin/sh
-set -e
-
-docker run --rm \
-    -t $(docker build --target testing -q .) \
-    --color=no szurubooru/
-
-exit $?
diff --git a/server/requirements.txt b/server/requirements.txt
index 2a09b24..ffe18f0 100644
--- a/server/requirements.txt
+++ b/server/requirements.txt
@@ -1,14 +1,15 @@
 alembic>=0.8.5
-pyyaml>=3.11
-psycopg2-binary>=2.6.1
-SQLAlchemy>=1.0.12, <1.4
-coloredlogs==5.0
 certifi>=2017.11.5
+coloredlogs==5.0
+heif-image-plugin==0.3.2
 numpy>=1.8.2
+pillow-avif-plugin~=1.1.0
 pillow>=4.3.0
+psycopg2-binary>=2.6.1
+pyheif==0.6.1
 pynacl>=1.2.1
-pytz>=2018.3
 pyRFC3339>=1.0
-pillow-avif-plugin>=1.1.0
-pyheif-pillow-opener>=0.1.0
-youtube_dl
+pytz>=2018.3
+pyyaml>=3.11
+SQLAlchemy>=1.0.12, <1.4
+yt-dlp
diff --git a/server/szuru-admin b/server/szuru-admin
index 004a751..08ba182 100755
--- a/server/szuru-admin
+++ b/server/szuru-admin
@@ -91,6 +91,15 @@ def reset_filenames() -> None:
     rename_in_dir("posts/custom-thumbnails/")
 
 
+def regenerate_thumbnails() -> None:
+    for post in db.session.query(model.Post).all():
+        print("Generating tumbnail for post %d ..." % post.post_id, end="\r")
+        try:
+            postfuncs.generate_post_thumbnail(post)
+        except Exception:
+            pass
+
+
 def main() -> None:
     parser_top = ArgumentParser(
         description="Collection of CLI commands for an administrator to use",
@@ -114,6 +123,12 @@ def main() -> None:
         help="reset and rename the content and thumbnail "
         "filenames in case of a lost/changed secret key",
     )
+    parser.add_argument(
+        "--regenerate-thumbnails",
+        action="store_true",
+        help="regenerate the thumbnails for posts if the "
+        "thumbnail files are missing",
+    )
     command = parser_top.parse_args()
 
     try:
@@ -123,6 +138,8 @@ def main() -> None:
             check_audio()
         elif command.reset_filenames:
             reset_filenames()
+        elif command.regenerate_thumbnails:
+            regenerate_thumbnails()
     except errors.BaseError as e:
         print(e, file=stderr)
 
diff --git a/server/szurubooru/config.py b/server/szurubooru/config.py
index 1515a54..f3f9007 100644
--- a/server/szurubooru/config.py
+++ b/server/szurubooru/config.py
@@ -21,7 +21,7 @@ def _merge(left: Dict, right: Dict) -> Dict:
     return left
 
 
-def _docker_config() -> Dict:
+def _container_config() -> Dict:
     if "TEST_ENVIRONMENT" not in os.environ:
         for key in ["POSTGRES_USER", "POSTGRES_PASSWORD", "POSTGRES_HOST"]:
             if key not in os.environ:
@@ -33,7 +33,7 @@ def _docker_config() -> Dict:
         "show_sql": int(os.getenv("LOG_SQL", 0)),
         "data_url": os.getenv("DATA_URL", "data/"),
         "data_dir": "/data/",
-        "database": "postgres://%(user)s:%(pass)s@%(host)s:%(port)d/%(db)s"
+        "database": "postgresql://%(user)s:%(pass)s@%(host)s:%(port)d/%(db)s"
         % {
             "user": os.getenv("POSTGRES_USER"),
             "pass": os.getenv("POSTGRES_PASSWORD"),
@@ -49,6 +49,15 @@ def _file_config(filename: str) -> Dict:
         return yaml.load(handle.read(), Loader=yaml.SafeLoader) or {}
 
 
+def _running_inside_container() -> bool:
+    env = os.environ.keys()
+    return (
+        os.path.exists("/.dockerenv")
+        or "KUBERNETES_SERVICE_HOST" in env
+        or "container" in env  # set by lxc/podman
+    )
+
+
 def _read_config() -> Dict:
     ret = _file_config("config.yaml.dist")
     if os.path.isfile("config.yaml"):
@@ -57,8 +66,8 @@ def _read_config() -> Dict:
         logger.warning(
             "'config.yaml' should be a file, not a directory, skipping"
         )
-    if os.path.exists("/.dockerenv"):
-        ret = _merge(ret, _docker_config())
+    if _running_inside_container():
+        ret = _merge(ret, _container_config())
     return ret
 
 
diff --git a/server/szurubooru/facade.py b/server/szurubooru/facade.py
index a7e4844..4c8084f 100644
--- a/server/szurubooru/facade.py
+++ b/server/szurubooru/facade.py
@@ -135,7 +135,7 @@ _live_migrations = (
 
 
 def create_app() -> Callable[[Any, Any], Any]:
-    """ Create a WSGI compatible App object. """
+    """Create a WSGI compatible App object."""
     validate_config()
     coloredlogs.install(fmt="[%(asctime)-15s] %(name)s %(message)s")
     if config.config["debug"]:
diff --git a/server/szurubooru/func/auth.py b/server/szurubooru/func/auth.py
index d013775..17d25f7 100644
--- a/server/szurubooru/func/auth.py
+++ b/server/szurubooru/func/auth.py
@@ -25,7 +25,7 @@ RANK_MAP = OrderedDict(
 
 
 def get_password_hash(salt: str, password: str) -> Tuple[str, int]:
-    """ Retrieve argon2id password hash. """
+    """Retrieve argon2id password hash."""
     return (
         pwhash.argon2id.str(
             (config.config["secret"] + salt + password).encode("utf8")
@@ -37,7 +37,7 @@ def get_password_hash(salt: str, password: str) -> Tuple[str, int]:
 def get_sha256_legacy_password_hash(
     salt: str, password: str
 ) -> Tuple[str, int]:
-    """ Retrieve old-style sha256 password hash. """
+    """Retrieve old-style sha256 password hash."""
     digest = hashlib.sha256()
     digest.update(config.config["secret"].encode("utf8"))
     digest.update(salt.encode("utf8"))
@@ -46,7 +46,7 @@ def get_sha256_legacy_password_hash(
 
 
 def get_sha1_legacy_password_hash(salt: str, password: str) -> Tuple[str, int]:
-    """ Retrieve old-style sha1 password hash. """
+    """Retrieve old-style sha1 password hash."""
     digest = hashlib.sha1()
     digest.update(b"1A2/$_4xVa")
     digest.update(salt.encode("utf8"))
@@ -125,7 +125,7 @@ def verify_privilege(user: model.User, privilege_name: str) -> None:
 
 
 def generate_authentication_token(user: model.User) -> str:
-    """ Generate nonguessable challenge (e.g. links in password reminder). """
+    """Generate nonguessable challenge (e.g. links in password reminder)."""
     assert user
     digest = hashlib.md5()
     digest.update(config.config["secret"].encode("utf8"))
diff --git a/server/szurubooru/func/image_hash.py b/server/szurubooru/func/image_hash.py
index a445e62..76d5a84 100644
--- a/server/szurubooru/func/image_hash.py
+++ b/server/szurubooru/func/image_hash.py
@@ -4,12 +4,10 @@ from datetime import datetime
 from io import BytesIO
 from typing import Any, Callable, List, Optional, Set, Tuple
 
+import HeifImagePlugin
 import numpy as np
-from PIL import Image
 import pillow_avif
-import pyheif
-from pyheif_pillow_opener import register_heif_opener
-register_heif_opener()
+from PIL import Image
 
 from szurubooru import config, errors
 
diff --git a/server/szurubooru/func/images.py b/server/szurubooru/func/images.py
index 101bba8..e135d18 100644
--- a/server/szurubooru/func/images.py
+++ b/server/szurubooru/func/images.py
@@ -6,6 +6,9 @@ import shlex
 import subprocess
 from io import BytesIO
 from typing import List
+
+import HeifImagePlugin
+import pillow_avif
 from PIL import Image as PILImage
 
 from szurubooru import errors
@@ -17,7 +20,7 @@ logger = logging.getLogger(__name__)
 def convert_heif_to_png(content: bytes) -> bytes:
     img = PILImage.open(BytesIO(content))
     img_byte_arr = BytesIO()
-    img.save(img_byte_arr, format='PNG')
+    img.save(img_byte_arr, format="PNG")
     return img_byte_arr.getvalue()
 
 
@@ -276,10 +279,10 @@ class Image:
             proc = subprocess.Popen(
                 cli,
                 stdout=subprocess.PIPE,
-                stdin=subprocess.PIPE,
+                stdin=subprocess.DEVNULL,
                 stderr=subprocess.PIPE,
             )
-            out, err = proc.communicate(input=self.content)
+            out, err = proc.communicate()
             if proc.returncode != 0:
                 logger.warning(
                     "Failed to execute ffmpeg command (cli=%r, err=%r)",
diff --git a/server/szurubooru/func/mime.py b/server/szurubooru/func/mime.py
index 93c096b..8fae567 100644
--- a/server/szurubooru/func/mime.py
+++ b/server/szurubooru/func/mime.py
@@ -36,9 +36,12 @@ def get_mime_type(content: bytes) -> str:
     if content[0:4] == b"\x1A\x45\xDF\xA3":
         return "video/webm"
 
-    if content[4:12] in (b"ftypisom", b"ftypiso5", b"ftypmp42", b"ftypM4V "):
+    if content[4:12] in (b"ftypisom", b"ftypiso5", b"ftypiso6", b"ftypmp42", b"ftypM4V "):
         return "video/mp4"
 
+    if content[4:12] == b"ftypqt  ":
+        return "video/quicktime"
+
     return "application/octet-stream"
 
 
@@ -54,6 +57,7 @@ def get_extension(mime_type: str) -> Optional[str]:
         "image/heif": "heif",
         "image/heic": "heic",
         "video/mp4": "mp4",
+        "video/quicktime": "mov",
         "video/webm": "webm",
         "application/octet-stream": "dat",
     }
@@ -65,7 +69,12 @@ def is_flash(mime_type: str) -> bool:
 
 
 def is_video(mime_type: str) -> bool:
-    return mime_type.lower() in ("application/ogg", "video/mp4", "video/webm")
+    return mime_type.lower() in (
+        "application/ogg",
+        "video/mp4",
+        "video/quicktime",
+        "video/webm",
+    )
 
 
 def is_image(mime_type: str) -> bool:
@@ -88,6 +97,7 @@ def is_animated_gif(content: bytes) -> bool:
         and len(re.findall(pattern, content)) > 1
     )
 
+
 def is_heif(mime_type: str) -> bool:
     return mime_type.lower() in (
         "image/heif",
diff --git a/server/szurubooru/func/net.py b/server/szurubooru/func/net.py
index 9dff3c4..d6aa95e 100644
--- a/server/szurubooru/func/net.py
+++ b/server/szurubooru/func/net.py
@@ -39,13 +39,20 @@ def download(url: str, use_video_downloader: bool = False) -> bytes:
     length_tally = 0
     try:
         with urllib.request.urlopen(request) as handle:
-            while (chunk := handle.read(_dl_chunk_size)) :
+            while chunk := handle.read(_dl_chunk_size):
                 length_tally += len(chunk)
                 if length_tally > config.config["max_dl_filesize"]:
-                    raise DownloadTooLargeError(url)
+                    raise DownloadTooLargeError(
+                        "Download target exceeds maximum. (%d)"
+                        % (config.config["max_dl_filesize"]),
+                        extra_fields={"URL": url},
+                    )
                 content_buffer += chunk
     except urllib.error.HTTPError as ex:
-        raise DownloadError(url) from ex
+        raise DownloadError(
+            "Download target returned HTTP %d. (%s)" % (ex.code, ex.reason),
+            extra_fields={"URL": url},
+        ) from ex
 
     if (
         youtube_dl_error
@@ -57,7 +64,7 @@ def download(url: str, use_video_downloader: bool = False) -> bytes:
 
 
 def _get_youtube_dl_content_url(url: str) -> str:
-    cmd = ["youtube-dl", "--format", "best", "--no-playlist"]
+    cmd = ["yt-dlp", "--format", "best", "--no-playlist"]
     if config.config["user_agent"]:
         cmd.extend(["--user-agent", config.config["user_agent"]])
     cmd.extend(["--get-url", url])
@@ -69,7 +76,8 @@ def _get_youtube_dl_content_url(url: str) -> str:
         )
     except subprocess.CalledProcessError:
         raise errors.ThirdPartyError(
-            "Could not extract content location from %s" % (url)
+            "Could not extract content location from URL.",
+            extra_fields={"URL": url},
         ) from None
 
 
diff --git a/server/szurubooru/func/util.py b/server/szurubooru/func/util.py
index eacdc2a..dc5ced0 100644
--- a/server/szurubooru/func/util.py
+++ b/server/szurubooru/func/util.py
@@ -87,12 +87,12 @@ def flip(source: Dict[Any, Any]) -> Dict[Any, Any]:
 
 
 def is_valid_email(email: Optional[str]) -> bool:
-    """ Return whether given email address is valid or empty. """
+    """Return whether given email address is valid or empty."""
     return not email or re.match(r"^[^@]*@[^@]*\.[^@]*$", email) is not None
 
 
 class dotdict(dict):
-    """ dot.notation access to dictionary attributes. """
+    """dot.notation access to dictionary attributes."""
 
     def __getattr__(self, attr: str) -> Any:
         return self.get(attr)
@@ -102,7 +102,7 @@ class dotdict(dict):
 
 
 def parse_time_range(value: str) -> Tuple[datetime, datetime]:
-    """ Return tuple containing min/max time for given text representation. """
+    """Return tuple containing min/max time for given text representation."""
     one_day = timedelta(days=1)
     one_second = timedelta(seconds=1)
     almost_one_day = one_day - one_second
diff --git a/server/szurubooru/middleware/authenticator.py b/server/szurubooru/middleware/authenticator.py
index e73b235..436543b 100644
--- a/server/szurubooru/middleware/authenticator.py
+++ b/server/szurubooru/middleware/authenticator.py
@@ -7,7 +7,7 @@ from szurubooru.rest.errors import HttpBadRequest
 
 
 def _authenticate_basic_auth(username: str, password: str) -> model.User:
-    """ Try to authenticate user. Throw AuthError for invalid users. """
+    """Try to authenticate user. Throw AuthError for invalid users."""
     user = users.get_user_by_name(username)
     if not auth.is_valid_password(user, password):
         raise errors.AuthError("Invalid password.")
@@ -17,7 +17,7 @@ def _authenticate_basic_auth(username: str, password: str) -> model.User:
 def _authenticate_token(
     username: str, token: str
 ) -> Tuple[model.User, model.UserToken]:
-    """ Try to authenticate user. Throw AuthError for invalid users. """
+    """Try to authenticate user. Throw AuthError for invalid users."""
     user = users.get_user_by_name(username)
     user_token = user_tokens.get_by_user_and_token(user, token)
     if not auth.is_valid_token(user_token):
@@ -72,7 +72,7 @@ def _get_user(ctx: rest.Context, bump_login: bool) -> Optional[model.User]:
 
 
 def process_request(ctx: rest.Context) -> None:
-    """ Bind the user to request. Update last login time if needed. """
+    """Bind the user to request. Update last login time if needed."""
     bump_login = ctx.get_param_as_bool("bump-login", default=False)
     auth_user = _get_user(ctx, bump_login)
     if auth_user:
diff --git a/server/szurubooru/rest/app.py b/server/szurubooru/rest/app.py
index a6f10fb..c098bd0 100644
--- a/server/szurubooru/rest/app.py
+++ b/server/szurubooru/rest/app.py
@@ -11,7 +11,7 @@ from szurubooru.rest import context, errors, middleware, routes
 
 
 def _json_serializer(obj: Any) -> str:
-    """ JSON serializer for objects not serializable by default JSON code """
+    """JSON serializer for objects not serializable by default JSON code"""
     if isinstance(obj, datetime):
         serial = obj.isoformat("T") + "Z"
         return serial
diff --git a/server/szurubooru/search/configs/post_search_config.py b/server/szurubooru/search/configs/post_search_config.py
index 4b2c8bb..9869843 100644
--- a/server/szurubooru/search/configs/post_search_config.py
+++ b/server/szurubooru/search/configs/post_search_config.py
@@ -214,6 +214,34 @@ def _create_metric_sort_column(metric_name: str):
     return ret
 
 
+def _category_filter(
+    query: SaQuery, criterion: Optional[criteria.BaseCriterion], negated: bool
+) -> SaQuery:
+    assert criterion
+
+    # Step 1. find the id for the category
+    q1 = db.session.query(model.TagCategory.tag_category_id).filter(
+        model.TagCategory.name == criterion.value
+    )
+
+    # Step 2. find the tags with that category
+    q2 = db.session.query(model.Tag.tag_id).filter(
+        model.Tag.category_id.in_(q1)
+    )
+
+    # Step 3. find all posts that have at least one of those tags
+    q3 = db.session.query(model.PostTag.post_id).filter(
+        model.PostTag.tag_id.in_(q2)
+    )
+
+    # Step 4. profit
+    expr = model.Post.post_id.in_(q3)
+    if negated:
+        expr = ~expr
+
+    return query.filter(expr)
+
+
 class PostSearchConfig(BaseSearchConfig):
     def __init__(self) -> None:
         self.user = None  # type: Optional[model.User]
@@ -451,6 +479,7 @@ class PostSearchConfig(BaseSearchConfig):
                 ),
                 (["pool"], _pool_filter),
                 (["similar"], _similar_filter),
+                (["category"], _category_filter),
             ]
         ))
         return filters
diff --git a/server/szurubooru/tests/api/test_tag_updating.py b/server/szurubooru/tests/api/test_tag_updating.py
index 9112c29..66939a4 100644
--- a/server/szurubooru/tests/api/test_tag_updating.py
+++ b/server/szurubooru/tests/api/test_tag_updating.py
@@ -167,8 +167,9 @@ def test_trying_to_create_metric_without_privileges(
         )
 
 
+@pytest.mark.parametrize("type", ["suggestions", "implications"])
 def test_trying_to_create_tags_without_privileges(
-    config_injector, context_factory, tag_factory, user_factory
+    config_injector, context_factory, tag_factory, user_factory, type
 ):
     tag = tag_factory(names=["tag"])
     db.session.add(tag)
@@ -187,16 +188,7 @@ def test_trying_to_create_tags_without_privileges(
         with pytest.raises(errors.AuthError):
             api.tag_api.update_tag(
                 context_factory(
-                    params={"suggestions": ["tag1", "tag2"], "version": 1},
-                    user=user_factory(rank=model.User.RANK_REGULAR),
-                ),
-                {"tag_name": "tag"},
-            )
-        db.session.rollback()
-        with pytest.raises(errors.AuthError):
-            api.tag_api.update_tag(
-                context_factory(
-                    params={"implications": ["tag1", "tag2"], "version": 1},
+                    params={type: ["tag1", "tag2"], "version": 1},
                     user=user_factory(rank=model.User.RANK_REGULAR),
                 ),
                 {"tag_name": "tag"},
diff --git a/server/szurubooru/tests/assets/mov.mov b/server/szurubooru/tests/assets/mov.mov
new file mode 100644
index 0000000..911ee85
--- /dev/null
+++ b/server/szurubooru/tests/assets/mov.mov
diff --git a/server/szurubooru/tests/conftest.py b/server/szurubooru/tests/conftest.py
index 50cbf7d..45113f5 100644
--- a/server/szurubooru/tests/conftest.py
+++ b/server/szurubooru/tests/conftest.py
@@ -43,14 +43,26 @@ def query_logger(pytestconfig):
         logging.getLogger("sqlalchemy.engine").setLevel(logging.INFO)
 
 
-@pytest.yield_fixture(scope="function", autouse=True)
-def session(query_logger, postgresql_db):
+@pytest.fixture(scope="function", autouse=True)
+def session(query_logger, transacted_postgresql_db):
+    db.session = transacted_postgresql_db.session
+    transacted_postgresql_db.create_table(*model.Base.metadata.sorted_tables)
+    try:
+        yield transacted_postgresql_db.session
+    finally:
+        transacted_postgresql_db.reset_db()
+
+
+@pytest.fixture(scope="function")
+def nontransacted_session(query_logger, postgresql_db):
+    old_db_session = db.session
     db.session = postgresql_db.session
     postgresql_db.create_table(*model.Base.metadata.sorted_tables)
     try:
         yield postgresql_db.session
     finally:
         postgresql_db.reset_db()
+        db.session = old_db_session
 
 
 @pytest.fixture
diff --git a/server/szurubooru/tests/func/test_mime.py b/server/szurubooru/tests/func/test_mime.py
index b33746b..551ba7c 100644
--- a/server/szurubooru/tests/func/test_mime.py
+++ b/server/szurubooru/tests/func/test_mime.py
@@ -7,6 +7,7 @@ from szurubooru.func import mime
     "input_path,expected_mime_type",
     [
         ("mp4.mp4", "video/mp4"),
+        ("mov.mov", "video/quicktime"),
         ("webm.webm", "video/webm"),
         ("flash.swf", "application/x-shockwave-flash"),
         ("png.png", "image/png"),
@@ -35,6 +36,7 @@ def test_get_mime_type_for_empty_file():
     [
         ("video/mp4", "mp4"),
         ("video/webm", "webm"),
+        ("video/quicktime", "mov"),
         ("application/x-shockwave-flash", "swf"),
         ("image/png", "png"),
         ("image/jpeg", "jpg"),
@@ -70,6 +72,8 @@ def test_is_flash(input_mime_type, expected_state):
         ("VIDEO/WEBM", True),
         ("video/mp4", True),
         ("VIDEO/MP4", True),
+        ("video/quicktime", True),
+        ("VIDEO/QUICKTIME", True),
         ("video/anything_else", False),
         ("application/ogg", True),
         ("not a video", False),
diff --git a/server/szurubooru/tests/func/test_net.py b/server/szurubooru/tests/func/test_net.py
index c5b4c73..be2f3c9 100644
--- a/server/szurubooru/tests/func/test_net.py
+++ b/server/szurubooru/tests/func/test_net.py
@@ -1,3 +1,5 @@
+import os
+
 import pytest
 
 from szurubooru import errors
@@ -16,6 +18,9 @@ def inject_config(tmpdir, config_injector):
     )
 
 
+@pytest.mark.skipif(
+    "TEST_NET" not in os.environ, reason="Network tests skipped by default."
+)
 def test_download():
     url = "http://info.cern.ch/hypertext/WWW/TheProject.html"
 
@@ -62,6 +67,9 @@ def test_download():
     assert actual_content == expected_content
 
 
+@pytest.mark.skipif(
+    "TEST_NET" not in os.environ, reason="Network tests skipped by default."
+)
 @pytest.mark.parametrize(
     "url",
     [
@@ -74,6 +82,9 @@ def test_too_large_download(url):
         net.download(url, use_video_downloader=True)
 
 
+@pytest.mark.skipif(
+    "TEST_NET" not in os.environ, reason="Network tests skipped by default."
+)
 @pytest.mark.parametrize(
     "url,expected_sha1",
     [
@@ -96,6 +107,9 @@ def test_content_download(url, expected_sha1):
     assert get_sha1(actual_content) == expected_sha1
 
 
+@pytest.mark.skipif(
+    "TEST_NET" not in os.environ, reason="Network tests skipped by default."
+)
 def test_bad_content_downlaod():
     url = "http://info.cern.ch/hypertext/WWW/TheProject.html"
     with pytest.raises(errors.ThirdPartyError):
@@ -108,11 +122,13 @@ def test_no_webhooks(config_injector):
     assert len(res) == 0
 
 
+@pytest.mark.skipif(
+    "TEST_NET" not in os.environ, reason="Network tests skipped by default."
+)
 @pytest.mark.parametrize(
     "webhook,status_code",
     [
         ("https://postman-echo.com/post", 200),
-        ("http://localhost/", 400),
         ("https://postman-echo.com/get", 400),
     ],
 )
@@ -121,6 +137,9 @@ def test_single_webhook(config_injector, webhook, status_code):
     assert ret == status_code
 
 
+@pytest.mark.skipif(
+    "TEST_NET" not in os.environ, reason="Network tests skipped by default."
+)
 def test_multiple_webhooks(config_injector):
     config_injector(
         {
diff --git a/server/szurubooru/tests/func/test_snapshots.py b/server/szurubooru/tests/func/test_snapshots.py
index da93530..dc68ff0 100644
--- a/server/szurubooru/tests/func/test_snapshots.py
+++ b/server/szurubooru/tests/func/test_snapshots.py
@@ -1,7 +1,7 @@
 from datetime import datetime
 from unittest.mock import patch
 
-import pytest
+import pytest  # noqa: F401
 
 from szurubooru import db, model
 from szurubooru.func import snapshots, users
@@ -144,46 +144,6 @@ def test_create(tag_factory, user_factory):
     assert results[0].data == "mocked"
 
 
-def test_modify_saves_non_empty_diffs(post_factory, user_factory):
-    if "sqlite" in db.session.get_bind().driver:
-        pytest.xfail(
-            "SQLite doesn't support transaction isolation, "
-            "which is required to retrieve original entity"
-        )
-    post = post_factory()
-    post.notes = [model.PostNote(polygon=[(0, 0), (0, 1), (1, 1)], text="old")]
-    user = user_factory()
-    db.session.add_all([post, user])
-    db.session.commit()
-    post.source = "new source"
-    post.notes = [model.PostNote(polygon=[(0, 0), (0, 1), (1, 1)], text="new")]
-    db.session.flush()
-    with patch("szurubooru.func.snapshots._post_to_webhooks"):
-        snapshots.modify(post, user)
-        db.session.flush()
-        results = db.session.query(model.Snapshot).all()
-        assert len(results) == 1
-        assert results[0].data == {
-            "type": "object change",
-            "value": {
-                "source": {
-                    "type": "primitive change",
-                    "old-value": None,
-                    "new-value": "new source",
-                },
-                "notes": {
-                    "type": "list change",
-                    "removed": [
-                        {"polygon": [[0, 0], [0, 1], [1, 1]], "text": "old"}
-                    ],
-                    "added": [
-                        {"polygon": [[0, 0], [0, 1], [1, 1]], "text": "new"}
-                    ],
-                },
-            },
-        }
-
-
 def test_modify_doesnt_save_empty_diffs(tag_factory, user_factory):
     tag = tag_factory(names=["dummy"])
     user = user_factory()
diff --git a/server/szurubooru/tests/func/test_snapshots_transactional_isolation.py b/server/szurubooru/tests/func/test_snapshots_transactional_isolation.py
new file mode 100644
index 0000000..b98cea7
--- /dev/null
+++ b/server/szurubooru/tests/func/test_snapshots_transactional_isolation.py
@@ -0,0 +1,59 @@
+from unittest.mock import patch
+
+import pytest
+
+from szurubooru import db, model
+from szurubooru.func import snapshots
+
+
+@pytest.fixture(autouse=True)
+def session(query_logger, postgresql_db):
+    """
+    Override db session for this specific test section only
+    """
+    db.session = postgresql_db.session
+    postgresql_db.create_table(*model.Base.metadata.sorted_tables)
+    try:
+        yield postgresql_db.session
+    finally:
+        postgresql_db.reset_db()
+
+
+def test_modify_saves_non_empty_diffs(post_factory, user_factory):
+    if "sqlite" in db.session.get_bind().driver:
+        pytest.xfail(
+            "SQLite doesn't support transaction isolation, "
+            "which is required to retrieve original entity"
+        )
+    post = post_factory()
+    post.notes = [model.PostNote(polygon=[(0, 0), (0, 1), (1, 1)], text="old")]
+    user = user_factory()
+    db.session.add_all([post, user])
+    db.session.commit()
+    post.source = "new source"
+    post.notes = [model.PostNote(polygon=[(0, 0), (0, 1), (1, 1)], text="new")]
+    db.session.flush()
+    with patch("szurubooru.func.snapshots._post_to_webhooks"):
+        snapshots.modify(post, user)
+        db.session.flush()
+        results = db.session.query(model.Snapshot).all()
+        assert len(results) == 1
+        assert results[0].data == {
+            "type": "object change",
+            "value": {
+                "source": {
+                    "type": "primitive change",
+                    "old-value": None,
+                    "new-value": "new source",
+                },
+                "notes": {
+                    "type": "list change",
+                    "removed": [
+                        {"polygon": [[0, 0], [0, 1], [1, 1]], "text": "old"}
+                    ],
+                    "added": [
+                        {"polygon": [[0, 0], [0, 1], [1, 1]], "text": "new"}
+                    ],
+                },
+            },
+        }
diff --git a/server/szurubooru/tests/func/test_tag_categories.py b/server/szurubooru/tests/func/test_tag_categories.py
index 11300cf..9e649a3 100644
--- a/server/szurubooru/tests/func/test_tag_categories.py
+++ b/server/szurubooru/tests/func/test_tag_categories.py
@@ -107,17 +107,16 @@ def test_update_category_name_reusing_other_name(
         tag_categories.update_category_name(category, "NAME")
 
 
+@pytest.mark.parametrize("name", ["name", "NAME"])
 def test_update_category_name_reusing_own_name(
-    config_injector, tag_category_factory
+    config_injector, tag_category_factory, name
 ):
     config_injector({"tag_category_name_regex": ".*"})
-    for name in ["name", "NAME"]:
-        category = tag_category_factory(name="name")
-        db.session.add(category)
-        db.session.flush()
-        tag_categories.update_category_name(category, name)
-        assert category.name == name
-        db.session.rollback()
+    category = tag_category_factory(name="name")
+    db.session.add(category)
+    db.session.flush()
+    tag_categories.update_category_name(category, name)
+    assert category.name == name
 
 
 def test_update_category_color_with_empty_string(tag_category_factory):
diff --git a/server/szurubooru/tests/func/test_tags.py b/server/szurubooru/tests/func/test_tags.py
index c938e68..79376f4 100644
--- a/server/szurubooru/tests/func/test_tags.py
+++ b/server/szurubooru/tests/func/test_tags.py
@@ -541,15 +541,14 @@ def test_update_tag_names_trying_to_use_taken_name(
         tags.update_tag_names(tag, ["A"])
 
 
-def test_update_tag_names_reusing_own_name(config_injector, tag_factory):
+@pytest.mark.parametrize("name", list("aA"))
+def test_update_tag_names_reusing_own_name(config_injector, tag_factory, name):
     config_injector({"tag_name_regex": "^[a-zA-Z]*$"})
-    for name in list("aA"):
-        tag = tag_factory(names=["a"])
-        db.session.add(tag)
-        db.session.flush()
-        tags.update_tag_names(tag, [name])
-        assert [tag_name.name for tag_name in tag.names] == [name]
-        db.session.rollback()
+    tag = tag_factory(names=["a"])
+    db.session.add(tag)
+    db.session.flush()
+    tags.update_tag_names(tag, [name])
+    assert [tag_name.name for tag_name in tag.names] == [name]
 
 
 def test_update_tag_names_changing_primary_name(config_injector, tag_factory):
@@ -561,7 +560,6 @@ def test_update_tag_names_changing_primary_name(config_injector, tag_factory):
     db.session.flush()
     db.session.refresh(tag)
     assert [tag_name.name for tag_name in tag.names] == ["b", "a"]
-    db.session.rollback()
 
 
 @pytest.mark.parametrize("attempt", ["name", "NAME", "alias", "ALIAS"])
diff --git a/server/szurubooru/tests/search/configs/test_pool_search_config.py b/server/szurubooru/tests/search/configs/test_pool_search_config.py
index 202635c..1103ec4 100644
--- a/server/szurubooru/tests/search/configs/test_pool_search_config.py
+++ b/server/szurubooru/tests/search/configs/test_pool_search_config.py
@@ -136,8 +136,6 @@ def test_escaping(
     )
     db.session.flush()
 
-    if db_driver and db.session.get_bind().driver != db_driver:
-        pytest.xfail()
     if expected_pool_names is None:
         with pytest.raises(errors.SearchError):
             executor.execute(input, offset=0, limit=100)
diff --git a/server/szurubooru/tests/search/configs/test_post_search_config.py b/server/szurubooru/tests/search/configs/test_post_search_config.py
index c9f2408..6ab5d52 100644
--- a/server/szurubooru/tests/search/configs/test_post_search_config.py
+++ b/server/szurubooru/tests/search/configs/test_post_search_config.py
@@ -1003,7 +1003,6 @@ def test_filter_by_similar(
     verify_unpaged(input, expected_post_ids, True)
 
 
-
 @pytest.mark.parametrize("input,expected_post_ids", [
     ("similar:1", [3, 1, 2]),
     ("similar:2", [3, 2, 1]),
@@ -1023,3 +1022,55 @@ def test_sort_by_similar(
     )
     db.session.flush()
     verify_unpaged(input, expected_post_ids, True)
+
+
+@pytest.mark.parametrize(
+    "input,expected_post_ids",
+    [
+        ("category:cat1", [1, 2, 3]),
+        ("category:cat2", [3, 4]),
+    ],
+)
+def test_search_by_tag_category(
+    verify_unpaged,
+    post_factory,
+    tag_factory,
+    tag_category_factory,
+    input,
+    expected_post_ids,
+):
+    cat1 = tag_category_factory(name="cat1")
+    cat2 = tag_category_factory(name="cat2")
+    tag1 = tag_factory(names=["t1"], category=cat1)
+    tag2 = tag_factory(names=["t2"], category=cat1)
+    tag3 = tag_factory(names=["t3"], category=cat2)
+
+    post1 = post_factory(id=1)
+    post1.tags.append(tag1)
+
+    post2 = post_factory(id=2)
+    post2.tags.append(tag2)
+
+    post3 = post_factory(id=3)
+    post3.tags.append(tag1)
+    post3.tags.append(tag3)
+
+    post4 = post_factory(id=4)
+    post4.tags.append(tag3)
+
+    post5 = post_factory(id=5)
+
+    db.session.add_all(
+        [
+            tag1,
+            tag2,
+            tag3,
+            post1,
+            post2,
+            post3,
+            post4,
+            post5,
+        ]
+    )
+    db.session.flush()
+    verify_unpaged(input, expected_post_ids)
diff --git a/server/szurubooru/tests/search/configs/test_tag_search_config.py b/server/szurubooru/tests/search/configs/test_tag_search_config.py
index 8175b73..9fe9a80 100644
--- a/server/szurubooru/tests/search/configs/test_tag_search_config.py
+++ b/server/szurubooru/tests/search/configs/test_tag_search_config.py
@@ -134,8 +134,6 @@ def test_escaping(executor, tag_factory, input, expected_tag_names, db_driver):
     )
     db.session.flush()
 
-    if db_driver and db.session.get_bind().driver != db_driver:
-        pytest.xfail()
     if expected_tag_names is None:
         with pytest.raises(errors.SearchError):
             executor.execute(input, offset=0, limit=100)