diff --git a/lib/www/client/source/src/components/qc-acceptance.vue b/lib/www/client/source/src/components/qc-acceptance.vue
new file mode 100644
index 0000000..df713dd
--- /dev/null
+++ b/lib/www/client/source/src/components/qc-acceptance.vue
@@ -0,0 +1,135 @@
+<template>
+
+    <v-hover v-slot:default="{hover}" v-if="!isEmpty(item)">
+      <span>
+        <v-btn v-if="!isAccepted(item)"
+          :class="{'text--disabled': !hover}"
+          icon
+          small
+          color="primary"
+          :title="isMultiple(item) ? 'Accept all' : 'Accept'"
+          @click.stop="accept(item)">
+          <v-icon small :color="isAccepted(item) ? 'green' : ''">
+            {{ isMultiple(item) ? 'mdi-check-all' : 'mdi-check' }}
+          </v-icon>
+        </v-btn>
+        <v-btn v-if="someAccepted(item)"
+          :class="{'text--disabled': !hover}"
+          icon
+          small
+          color="primary"
+          :title="isMultiple(item) ? 'Restore all' : 'Restore'"
+          @click.stop="unaccept(item)">
+          <v-icon small>
+            {{ isMultiple(item) ? 'mdi-restore' : 'mdi-restore' }}
+          </v-icon>
+        </v-btn>
+      </span>
+    </v-hover>
+
+</template>
+
+<script>
+
+export default {
+  name: 'DougalQcAcceptance',
+
+  props: {
+    item: { type: Object }
+  },
+
+  methods: {
+
+    isAccepted (item) {
+      if (item._children) {
+        return item._children.every(child => this.isAccepted(child));
+      }
+
+      if (item.labels) {
+        return item.labels.includes("QCAccepted");
+      }
+
+      return false;
+    },
+
+    someAccepted (item) {
+      if (item._children) {
+        return item._children.some(child => this.someAccepted(child));
+      }
+
+      if (item.labels) {
+        return item.labels.includes("QCAccepted");
+      }
+
+      return false;
+    },
+
+    isEmpty (item) {
+      return item._children?.length === 0;
+    },
+
+    isMultiple (item) {
+      return item._children?.length;
+    },
+
+    action (action, item) {
+      const items = [];
+
+      const iterate = (item) => {
+        if (item._kind == "point") {
+
+          if (this.isAccepted(item)) {
+            if (action == "unaccept") {
+              items.push(item);
+            }
+          } else {
+            if (action == "accept") {
+              items.push(item);
+            }
+          }
+
+        } else if (item._kind == "sequence" || item._kind == "test") {
+
+          if (item._children) {
+
+            for (const child of item._children) {
+              iterate(child);
+            }
+
+          }
+
+          if (item._shots) {
+
+            for (const child of item._children) {
+              iterate(child);
+            }
+
+          }
+
+        }
+
+      }
+
+      iterate(item);
+      return items;
+    },
+
+    accept (item) {
+      const items = this.action('accept', item);
+      if (items.length) {
+        this.$emit('accept', items);
+      }
+    },
+
+    unaccept (item) {
+      const items = this.action('unaccept', item);
+      if (items.length) {
+        this.$emit('unaccept', items);
+      }
+    }
+
+  }
+
+}
+
+</script>
diff --git a/lib/www/client/source/src/views/QC.vue b/lib/www/client/source/src/views/QC.vue
index 5b195d9..6a5fa23 100644
--- a/lib/www/client/source/src/views/QC.vue
+++ b/lib/www/client/source/src/views/QC.vue
@@ -50,16 +50,6 @@
           <v-col col="12" sm="6">
             <p>QC checks done on {{updatedOn}}.</p>
           </v-col>
-          <v-col class="text-right">
-            <div v-if="isDirty">
-              <v-btn @click="saveLabels" small color="primary" class="mx-2">
-                Save <v-icon right>mdi-content-save</v-icon>
-              </v-btn>
-              <v-btn @click="getQCData" small color="warning" outlined class="mx-2">
-                Cancel <v-icon right>mdi-restore-alert</v-icon>
-              </v-btn>
-            </div>
-          </v-col>
         </v-row>
 
         <v-treeview
@@ -98,39 +88,11 @@
                 {{label}}
               </v-chip>
 
-              <template v-if="!item.labels || !item.labels.includes('QCAccepted')">
-                <v-hover v-slot:default="{hover}" v-if="writeaccess">
-                  <span  v-if="item.children && item.children.length">
-                    <v-btn
-                      :class="{'text--disabled': !hover}"
-                      icon
-                      small
-                      color="primary"
-                      title="Accept all"
-                      @click.stop="accept(item)">
-                      <v-icon small :color="accepted(item) ? 'green' : ''">mdi-check-all</v-icon>
-                    </v-btn>
-                    <v-btn
-                      :class="{'text--disabled': !hover}"
-                      icon
-                      small
-                      color="primary"
-                      title="Restore all"
-                      @click.stop="unaccept(item)">
-                      <v-icon small>mdi-restore</v-icon>
-                    </v-btn>
-                  </span>
-                  <v-btn v-else
-                    :class="{'text--disabled': !hover}"
-                    icon
-                    small
-                    color="primary"
-                    title="Accept this value"
-                    @click="accept(item)">
-                    <v-icon small :color="(item.children && item.children.length == 0)? 'green':''">mdi-check</v-icon>
-                  </v-btn>
-                </v-hover>
-              </template>
+              <dougal-qc-acceptance v-if="writeaccess"
+                :item="item"
+                @accept="accept"
+                @unaccept="unaccept"
+              ></dougal-qc-acceptance>
 
             </div>
             <div :title="item.remarks" @dblclick.stop.prevent="toggleChildren(item)" v-else-if="item._kind=='sequence'">
@@ -142,8 +104,21 @@
               v-text="itemCount(item)"
               >
               </v-chip>
+
+              <dougal-qc-acceptance v-if="writeaccess"
+                :item="item"
+                @accept="accept"
+                @unaccept="unaccept"
+              ></dougal-qc-acceptance>
+
             </div>
             <div class="text--secondary" v-else>
+              <dougal-qc-acceptance v-if="writeaccess"
+                :item="item"
+                @accept="accept"
+                @unaccept="unaccept"
+              ></dougal-qc-acceptance>
+
               {{item._text}}
             </div>
           </template>
@@ -164,10 +139,15 @@
 <script>
 import { mapActions, mapGetters } from 'vuex';
 import { withParentProps } from '@/lib/utils';
+import DougalQcAcceptance from '@/components/qc-acceptance';
 
 export default {
   name: "QC",
 
+  components: {
+    DougalQcAcceptance
+  },
+
   data () {
     return {
       updatedOn: null,
@@ -179,8 +159,7 @@ export default {
       selectedSequences: null,
       multiple: false,
       autoexpand: false,
-      itemIndex: 0,
-      isDirty: false
+      itemIndex: 0
     }
   },
 
@@ -283,44 +262,26 @@ export default {
       return sum;
     },
 
-    accepted (item) {
-      if (item._children) {
-        return item._children.every(child => this.accepted(child));
-      }
+    async accept (items) {
+      const url = `/project/${this.$route.params.project}/qc/results/accept`;
+      await this.api([url, {
+        method: "POST",
+        body: items.map(i => i.id)
+      }]);
 
-      if (item.labels) {
-        return item.labels.includes("QCAccepted");
-      }
-      return false;
+      // The open/closed state of the tree branches should stay the same, unless
+      // the tree structure itself has changed in the meanwhile.
+      await this.getQCData();
     },
 
-    accept (item) {
-      if (item._children) {
-        for (const child of item._children) {
-          this.accept(child);
-        }
-        return;
-      }
+    async unaccept (items) {
+      const url = `/project/${this.$route.params.project}/qc/results/unaccept`;
+      await this.api([url, {
+        method: "POST",
+        body: items.map(i => i.id)
+      }]);
 
-      if (!item.labels) {
-        this.$set(item, "labels", []);
-      }
-      item.labels.includes("QCAccepted") || item.labels.push("QCAccepted");
-      this.isDirty = true;
-    },
-
-    unaccept (item) {
-      if (item._children) {
-        for (const child of item._children) {
-          this.unaccept(child);
-        }
-        return;
-      }
-      const i = item.labels.indexOf("QCAccepted");
-      if (i != -1) {
-        item.labels.splice(i, 1);
-        this.isDirty = true;
-      }
+      await this.getQCData();
     },
 
     async getQCLabels () {
@@ -375,16 +336,6 @@ export default {
       await Promise.all(promises);
     },
 
-    async saveLabels () {
-      const url = `/project/${this.$route.params.project}/meta`;
-
-      const res = await this.api([url, {
-        method: "PUT",
-        body: this.resultObjects.filter(r => typeof r.value !== "undefined")
-      }]);
-      this.isDirty = false;
-    },
-
     filterByText(item, queryText) {
       if (!queryText || !item) return item;
 
@@ -495,6 +446,7 @@ export default {
       const res = await this.api([url]);
 
       if (res) {
+        this.itemIndex = 0;
         this.items = res.map(i => this.transform(i)) || [];
         this.updatedOn = res.updatedOn;
         await this.getQCLabels();
@@ -503,7 +455,6 @@ export default {
         this.updatedOn = null;
       }
 
-      this.isDirty = false;
     },
 
     ...mapActions(["api"])
diff --git a/lib/www/server/api/index.js b/lib/www/server/api/index.js
index 2f173b5..d37d077 100644
--- a/lib/www/server/api/index.js
+++ b/lib/www/server/api/index.js
@@ -8,7 +8,7 @@ const mw = require('./middleware');
 
 const verbose = process.env.NODE_ENV != 'test';
 const app = express();
-app.locals.version = "0.3.0"; // API version
+app.locals.version = "0.3.1"; // API version
 
 app.map = function(a, route){
 	route = route || '';
@@ -187,6 +187,14 @@ app.map({
 			// Delete all QC results for :project
 			delete: [ mw.auth.access.write, mw.qc.results.delete ],
 
+			'/accept': {
+				post: [ mw.auth.access.write, mw.qc.results.accept ]
+			},
+
+			'/unaccept': {
+				post: [ mw.auth.access.write, mw.qc.results.unaccept ]
+			},
+
 			'/sequence/:sequence': {
 				// Get QC results for :project, :sequence
 				get: [ mw.qc.results.get ],
diff --git a/lib/www/server/api/middleware/qc/results/accept.js b/lib/www/server/api/middleware/qc/results/accept.js
new file mode 100644
index 0000000..983a35e
--- /dev/null
+++ b/lib/www/server/api/middleware/qc/results/accept.js
@@ -0,0 +1,16 @@
+
+const { qc } = require('../../../../lib/db');
+
+module.exports = async function (req, res, next) {
+
+	try {
+		const payload = req.body;
+
+		await qc.results.accept(req.params.project, payload);
+		res.status(204).send();
+		next();
+	} catch (err) {
+		next(err);
+	}
+
+};
diff --git a/lib/www/server/api/middleware/qc/results/index.js b/lib/www/server/api/middleware/qc/results/index.js
index 1afd763..6b8ec1b 100644
--- a/lib/www/server/api/middleware/qc/results/index.js
+++ b/lib/www/server/api/middleware/qc/results/index.js
@@ -1,4 +1,6 @@
 module.exports = {
 	get: require('./get'),
-	delete: require('./delete')
+	delete: require('./delete'),
+	accept: require('./accept'),
+	unaccept: require('./unaccept')
 };
diff --git a/lib/www/server/api/middleware/qc/results/unaccept.js b/lib/www/server/api/middleware/qc/results/unaccept.js
new file mode 100644
index 0000000..2dbdc7d
--- /dev/null
+++ b/lib/www/server/api/middleware/qc/results/unaccept.js
@@ -0,0 +1,16 @@
+
+const { qc } = require('../../../../lib/db');
+
+module.exports = async function (req, res, next) {
+
+	try {
+		const payload = req.body;
+
+		await qc.results.unaccept(req.params.project, payload);
+		res.status(204).send();
+		next();
+	} catch (err) {
+		next(err);
+	}
+
+};
diff --git a/lib/www/server/lib/db/qc/results/accept.js b/lib/www/server/lib/db/qc/results/accept.js
new file mode 100644
index 0000000..5c92c8d
--- /dev/null
+++ b/lib/www/server/lib/db/qc/results/accept.js
@@ -0,0 +1,23 @@
+const { setSurvey } = require('../../connection');
+
+async function accept (projectId, payload) {
+	const client = await setSurvey(projectId);
+
+	const text = `
+		UPDATE event_log_full
+		SET
+			labels = array_append(labels, 'QCAccepted')
+		WHERE
+			validity @> current_timestamp
+			AND id = ANY($1)
+			AND NOT ('QCAccepted' = ANY(labels));
+	`;
+
+	const values = [ payload ];
+
+	await client.query(text, values);
+	client.release();
+	return;
+}
+
+module.exports = accept;
diff --git a/lib/www/server/lib/db/qc/results/index.js b/lib/www/server/lib/db/qc/results/index.js
index ed59f33..183d88f 100644
--- a/lib/www/server/lib/db/qc/results/index.js
+++ b/lib/www/server/lib/db/qc/results/index.js
@@ -1,5 +1,7 @@
 
 module.exports = {
 	get: require('./get'),
-	delete: require('./delete')
+	delete: require('./delete'),
+	accept: require('./accept'),
+	unaccept: require('./unaccept')
 };
diff --git a/lib/www/server/lib/db/qc/results/unaccept.js b/lib/www/server/lib/db/qc/results/unaccept.js
new file mode 100644
index 0000000..9c0d537
--- /dev/null
+++ b/lib/www/server/lib/db/qc/results/unaccept.js
@@ -0,0 +1,22 @@
+const { setSurvey, transaction } = require('../../connection');
+
+async function unaccept (projectId, payload) {
+	const client = await setSurvey(projectId);
+
+	const text = `
+		UPDATE event_log_full
+		SET
+			labels = array_remove(labels, 'QCAccepted')
+		WHERE
+			validity @> current_timestamp
+			AND id = ANY($1);
+	`;
+
+	const values = [ payload ];
+
+	await client.query(text, values);
+	client.release();
+	return;
+}
+
+module.exports = unaccept;
diff --git a/lib/www/server/spec/openapi.yaml b/lib/www/server/spec/openapi.yaml
index b91a0ce..818f694 100644
--- a/lib/www/server/spec/openapi.yaml
+++ b/lib/www/server/spec/openapi.yaml
@@ -1,6 +1,6 @@
 openapi: 3.0.0
 info:
-    version: 0.3.0
+    version: 0.3.1
     title: Dougal API
     description: >
         Public API of the Dougal seismic production & data analysis tool.
@@ -55,6 +55,9 @@ tags:
     -
         name: log
         description: Project events log
+    -
+        name: qc
+        description: Project quality control definition and results
     -
         name: metadata
         description: Project items metadata
@@ -1401,6 +1404,133 @@ paths:
                     $ref: "#/components/responses/401"
 
 
+    /project/{project}/qc/results:
+        get:
+            summary: Get QC results.
+            tags: [ "qc" ]
+            security:
+                - BearerAuthGuest: []
+                - CookieAuthGuest: []
+            parameters:
+                - $ref: "#/components/parameters/Project"
+            responses:
+                "200":
+                    description: Project QC results.
+                    content:
+                        application/json:
+                            schema:
+                                type: object
+                                description: |
+                                    The returned object is a tree structure of QC tests and their results.
+                "401":
+                    $ref: "#/components/responses/401"
+        delete:
+            summary: Delete all QC results.
+            tags: [ "qc" ]
+            security:
+                - BearerAuthUser: []
+                - BearerAuthUser: []
+            parameters:
+                - $ref: "#/components/parameters/Project"
+            responses:
+                "204":
+                    description: |
+                        All QC results for the project have been deleted.  
+                        Note that unless the project has been archived, the QCs will be regenerated in the next run of the deferred tasks process.
+                "401":
+                    $ref: "#/components/responses/401"
+
+
+    /project/{project}/qc/results/accept:
+        post:
+            summary: Accept shotpoint QC results.
+            tags: [ "qc" ]
+            security:
+                - BearerAuthUser: []
+                - BearerAuthUser: []
+            parameters:
+                - $ref: "#/components/parameters/Project"
+            requestBody:
+                required: true
+                content:
+                    application/json:
+                        schema:
+                            type: array
+                            items:
+                                type: integer
+                                description: Event ID of the QC result to mark as accepted.
+            responses:
+                "204":
+                    description: |
+                        The QC events referenced in the request body have been marked as accepted. These events will not be exported to Seis+JSON files or derived human-readable reports.
+                "401":
+                    $ref: "#/components/responses/401"
+
+    /project/{project}/qc/results/unaccept:
+        post:
+            summary: Unaccept shotpoint QC results.
+            tags: [ "qc" ]
+            security:
+                - BearerAuthUser: []
+                - BearerAuthUser: []
+            parameters:
+                - $ref: "#/components/parameters/Project"
+            responses:
+                "204":
+                    description: |
+                        The QC events referenced in the request body are no longer marked as accepted.
+                "401":
+                    $ref: "#/components/responses/401"
+            requestBody:
+                required: true
+                content:
+                    application/json:
+                        schema:
+                            type: array
+                            items:
+                                type: integer
+                                description: Event ID of the QC result to no longer mark accepted.
+
+
+    /project/{project}/qc/results/sequence/{sequence}:
+        get:
+            summary: Get sequence QC results.
+            tags: [ "qc" ]
+            security:
+                - BearerAuthGuest: []
+                - CookieAuthGuest: []
+            parameters:
+                - $ref: "#/components/parameters/Project"
+                - $ref: "#/components/parameters/SequenceNumber"
+            responses:
+                "200":
+                    description: Sequence QC results.
+                    content:
+                        application/json:
+                            schema:
+                                type: object
+                                description: |
+                                    The returned object is a tree structure of QC tests and their results for a specific sequence
+                "401":
+                    $ref: "#/components/responses/401"
+        delete:
+            summary: Delete sequence QC results.
+            tags: [ "qc" ]
+            security:
+                - BearerAuthUser: []
+                - BearerAuthUser: []
+            parameters:
+                - $ref: "#/components/parameters/Project"
+                - $ref: "#/components/parameters/SequenceNumber"
+            responses:
+                "204":
+                    description: |
+                        All QC results for the sequence have been deleted.  
+                        Note that unless the project has been archived, the QCs will be regenerated in the next run of the deferred tasks process.
+                "401":
+                    $ref: "#/components/responses/401"
+
+
     /project/{project}/configuration/{path}:
         get:
             summary: Get project configuration data.