diff --git a/api/openapi.yaml b/api/openapi.yaml
index 38e7f0a..1bd154d 100644
--- a/api/openapi.yaml
+++ b/api/openapi.yaml
@@ -1,171 +1,203 @@
-#
-# ClusterCockpit's API spec can be exported via:
-# docker exec -it cc-php php bin/console api:openapi:export --yaml
-#
-# This spec is written by hand and hopefully up to date with the API.
-#
-
-openapi: 3.0.3
-info:
-  title: 'ClusterCockpit REST API'
-  description: 'API for batch job control'
-  version: 0.0.2
-servers:
-  - url: /
-    description: ''
-paths:
-  '/api/jobs/{id}':
-    get:
-      operationId: 'getJob'
-      summary: 'Get job resource'
-      parameters:
-        - name: id
-          in: path
-          required: true
-          schema: { type: integer }
-          description: 'Database ID (Resource Identifier)'
-      responses:
-        200:
-          description: 'Job resource'
-          content:
-            'application/json':
-              schema:
-                $ref: '#/components/schemas/Job'
-        404:
-          description: 'Resource not found'
-  '/api/jobs/tag_job/{id}':
-    post:
-      operationId: 'tagJob'
-      summary: 'Add a tag to a job'
-      parameters:
-        - name: id
-          in: path
-          required: true
-          schema: { type: integer }
-          description: 'Job ID'
-      requestBody:
-        description: 'Array of tags to add'
-        required: true
-        content:
-          'application/json':
-            schema:
-              type: array
-              items:
-                $ref: '#/components/schemas/Tag'
-      responses:
-        200:
-          description: 'Job resource'
-          content:
-            'application/json':
-              schema:
-                $ref: '#/components/schemas/Job'
-        404:
-          description: 'Job or tag does not exist'
-        400:
-          description: 'Bad request'
-  '/api/jobs/start_job/':
-    post:
-      operationId: 'startJob'
-      summary: 'Add a newly started job'
-      requestBody:
-        required: true
-        content:
-          'application/json':
-            schema:
-              $ref: '#/components/schemas/Job'
-      responses:
-        201:
-          description: 'Job successfully'
-          content:
-            'application/json':
-              schema:
-                type: object
-                properties:
-                  id:
-                    type: integer
-                    description: 'The database ID assigned to this job'
-        400:
-          description: 'Bad request'
-        422:
-          description: 'The combination of jobId, clusterId and startTime does already exist'
-  '/api/jobs/stop_job/':
-    post:
-      operationId: stopJobViaJobID
-      summary: 'Mark a job as stopped. Which job to stop is specified by the request body.'
-      requestBody:
-        required: true
-        content:
-          'application/json':
-            schema:
-              type: object
-              required: [jobId, cluster, startTime, stopTime]
-              properties:
-                jobId: { type: integer }
-                cluster: { type: string }
-                startTime: { type: integer }
-                stopTime: { type: integer }
-      responses:
-        200:
-          description: 'Job resource'
-          content:
-            'application/json':
-              schema:
-                $ref: '#/components/schemas/Job'
-        400:
-          description: 'Bad request'
-        404:
-          description: 'Resource not found'
-  '/api/jobs/stop_job/{id}':
-    post:
-      operationId: 'stopJobViaDBID'
-      summary: 'Mark a job as stopped.'
-      parameters:
-        - name: id
-          in: path
-          required: true
-          schema: { type: integer }
-          description: 'Database ID (Resource Identifier)'
-      requestBody:
-        required: true
-        content:
-          'application/json':
-            schema:
-              type: object
-              required: [stopTime]
-              properties:
-                stopTime: { type: integer }
-      responses:
-        200:
-          description: 'Job resource'
-          content:
-            'application/json':
-              schema:
-                $ref: '#/components/schemas/Job'
-        400:
-          description: 'Bad request'
-        404:
-          description: 'Resource not found'
-components:
-  schemas:
-    Tag:
-      description: 'A job tag'
-      type: object
-      properties:
-        id:
-          type: string
-          description: 'Database ID'
-        type:
-          type: string
-          description: 'Tag type'
-        name:
-          type: string
-          description: 'Tag name'
-    Job:
-      $ref: https://raw.githubusercontent.com/ClusterCockpit/cc-specifications/master/schema/json/job-meta.schema.json
-  securitySchemes:
-    bearerAuth:
-      type: http
-      scheme: bearer
-      bearerFormat: JWT
-security:
+#
+# ClusterCockpit's API spec can be exported via:
+# docker exec -it cc-php php bin/console api:openapi:export --yaml
+#
+# This spec is written by hand and hopefully up to date with the API.
+#
+
+openapi: 3.0.3
+info:
+  title: 'ClusterCockpit REST API'
+  description: 'API for batch job control'
+  version: 0.0.2
+servers:
+  - url: /
+    description: ''
+paths:
+  '/api/jobs/':
+    get:
+      operationId: 'getJobs'
+      summary: 'List all jobs'
+      description: 'Get a list of all jobs in the JSON schema defined via GraphQL (main difference: start-time is RFC3339 encoded and there are no statistics). Filters can be applied using query parameters.'
+      parameters:
+        - name: state
+          in: query
+          schema:
+            type: string
+            enum: ["running", "completed", "failed", "canceled", "stopped", "timeout"]
+        - name: cluster
+          in: query
+          schema: { type: string }
+      responses:
+        200:
+          description: 'Array of jobs'
+          content:
+            'application/json':
+              schema:
+                type: array
+                items:
+                  # Not totally true: start-time is a RFC3339 string here!
+                  $ref: '#/components/schemas/Job'
+        400:
+          description: 'Bad Request'
+  '/api/jobs/{id}':
+    get:
+      operationId: 'getJob'
+      summary: 'Get job resource'
+      parameters:
+        - name: id
+          in: path
+          required: true
+          schema: { type: integer }
+          description: 'Database ID (Resource Identifier)'
+      responses:
+        200:
+          description: 'Job resource'
+          content:
+            'application/json':
+              schema:
+                $ref: '#/components/schemas/Job'
+        404:
+          description: 'Resource not found'
+  '/api/jobs/tag_job/{id}':
+    post:
+      operationId: 'tagJob'
+      summary: 'Add a tag to a job'
+      parameters:
+        - name: id
+          in: path
+          required: true
+          schema: { type: integer }
+          description: 'Job ID'
+      requestBody:
+        description: 'Array of tags to add'
+        required: true
+        content:
+          'application/json':
+            schema:
+              type: array
+              items:
+                $ref: '#/components/schemas/Tag'
+      responses:
+        200:
+          description: 'Job resource'
+          content:
+            'application/json':
+              schema:
+                $ref: '#/components/schemas/Job'
+        404:
+          description: 'Job or tag does not exist'
+        400:
+          description: 'Bad request'
+  '/api/jobs/start_job/':
+    post:
+      operationId: 'startJob'
+      summary: 'Add a newly started job'
+      requestBody:
+        required: true
+        content:
+          'application/json':
+            schema:
+              $ref: '#/components/schemas/Job'
+      responses:
+        201:
+          description: 'Job successfully'
+          content:
+            'application/json':
+              schema:
+                type: object
+                properties:
+                  id:
+                    type: integer
+                    description: 'The database ID assigned to this job'
+        400:
+          description: 'Bad request'
+        422:
+          description: 'The combination of jobId, clusterId and startTime does already exist'
+  '/api/jobs/stop_job/':
+    post:
+      operationId: stopJobViaJobID
+      summary: 'Mark a job as stopped. Which job to stop is specified by the request body.'
+      requestBody:
+        required: true
+        content:
+          'application/json':
+            schema:
+              type: object
+              required: [jobId, cluster, stopTime, jobState]
+              properties:
+                jobId: { type: integer }
+                cluster: { type: string }
+                startTime: { type: integer }
+                stopTime: { type: integer }
+                jobState:
+                  type: string
+                  enum: ["running", "completed", "failed", "canceled", "stopped", "timeout"]
+      responses:
+        200:
+          description: 'Job resource'
+          content:
+            'application/json':
+              schema:
+                $ref: '#/components/schemas/Job'
+        400:
+          description: 'Bad request'
+        404:
+          description: 'Resource not found'
+  '/api/jobs/stop_job/{id}':
+    post:
+      operationId: 'stopJobViaDBID'
+      summary: 'Mark a job as stopped.'
+      parameters:
+        - name: id
+          in: path
+          required: true
+          schema: { type: integer }
+          description: 'Database ID (Resource Identifier)'
+      requestBody:
+        required: true
+        content:
+          'application/json':
+            schema:
+              type: object
+              required: [stopTime, jobState]
+              properties:
+                stopTime: { type: integer }
+                jobState:
+                  type: string
+                  enum: ["running", "completed", "failed", "canceled", "stopped", "timeout"]
+      responses:
+        200:
+          description: 'Job resource'
+          content:
+            'application/json':
+              schema:
+                $ref: '#/components/schemas/Job'
+        400:
+          description: 'Bad request'
+        404:
+          description: 'Resource not found'
+components:
+  schemas:
+    Tag:
+      description: 'A job tag'
+      type: object
+      properties:
+        id:
+          type: string
+          description: 'Database ID'
+        type:
+          type: string
+          description: 'Tag type'
+        name:
+          type: string
+          description: 'Tag name'
+    Job:
+      $ref: https://raw.githubusercontent.com/ClusterCockpit/cc-specifications/master/schema/json/job-meta.schema.json
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+security:
   - bearerAuth: [] # Applies `bearerAuth` globally
\ No newline at end of file
diff --git a/api/rest.go b/api/rest.go
index 725aa84..9526252 100644
--- a/api/rest.go
+++ b/api/rest.go
@@ -1,6 +1,7 @@
 package api
 
 import (
+	"bufio"
 	"context"
 	"encoding/json"
 	"fmt"
@@ -13,6 +14,7 @@ import (
 
 	"github.com/ClusterCockpit/cc-jobarchive/config"
 	"github.com/ClusterCockpit/cc-jobarchive/graph"
+	"github.com/ClusterCockpit/cc-jobarchive/graph/model"
 	"github.com/ClusterCockpit/cc-jobarchive/metricdata"
 	"github.com/ClusterCockpit/cc-jobarchive/schema"
 	sq "github.com/Masterminds/squirrel"
@@ -36,11 +38,14 @@ func (api *RestApi) MountRoutes(r *mux.Router) {
 	r.HandleFunc("/jobs/stop_job/", api.stopJob).Methods(http.MethodPost, http.MethodPut)
 	r.HandleFunc("/jobs/stop_job/{id}", api.stopJob).Methods(http.MethodPost, http.MethodPut)
 
+	r.HandleFunc("/jobs/", api.getJobs).Methods(http.MethodGet)
 	r.HandleFunc("/jobs/{id}", api.getJob).Methods(http.MethodGet)
 	r.HandleFunc("/jobs/tag_job/{id}", api.tagJob).Methods(http.MethodPost, http.MethodPatch)
 
-	r.HandleFunc("/machine_state/{cluster}/{host}", api.getMachineState).Methods(http.MethodGet)
-	r.HandleFunc("/machine_state/{cluster}/{host}", api.putMachineState).Methods(http.MethodPut, http.MethodPost)
+	if api.MachineStateDir != "" {
+		r.HandleFunc("/machine_state/{cluster}/{host}", api.getMachineState).Methods(http.MethodGet)
+		r.HandleFunc("/machine_state/{cluster}/{host}", api.putMachineState).Methods(http.MethodPut, http.MethodPost)
+	}
 }
 
 type StartJobApiRespone struct {
@@ -50,7 +55,7 @@ type StartJobApiRespone struct {
 type StopJobApiRequest struct {
 	// JobId, ClusterId and StartTime are optional.
 	// They are only used if no database id was provided.
-	JobId     *string `json:"jobId"`
+	JobId     *int64  `json:"jobId"`
 	Cluster   *string `json:"cluster"`
 	StartTime *int64  `json:"startTime"`
 
@@ -64,6 +69,44 @@ type TagJobApiRequest []*struct {
 	Type string `json:"type"`
 }
 
+// Return a list of jobs
+func (api *RestApi) getJobs(rw http.ResponseWriter, r *http.Request) {
+	filter := model.JobFilter{}
+	for key, vals := range r.URL.Query() {
+		switch key {
+		case "state":
+			for _, s := range vals {
+				state := schema.JobState(s)
+				if !state.Valid() {
+					http.Error(rw, "invalid query parameter value: state", http.StatusBadRequest)
+					return
+				}
+				filter.State = append(filter.State, state)
+			}
+		case "cluster":
+			filter.Cluster = &model.StringInput{Eq: &vals[0]}
+		default:
+			http.Error(rw, "invalid query parameter: "+key, http.StatusBadRequest)
+			return
+		}
+	}
+
+	results, err := api.Resolver.Query().Jobs(r.Context(), []*model.JobFilter{&filter}, nil, nil)
+	if err != nil {
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	bw := bufio.NewWriter(rw)
+	defer bw.Flush()
+
+	if err := json.NewEncoder(bw).Encode(results.Items); err != nil {
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+// Return a single job
 func (api *RestApi) getJob(rw http.ResponseWriter, r *http.Request) {
 	id := mux.Vars(r)["id"]
 
@@ -84,6 +127,7 @@ func (api *RestApi) getJob(rw http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(rw).Encode(job)
 }
 
+// Add a tag to a job
 func (api *RestApi) tagJob(rw http.ResponseWriter, r *http.Request) {
 	id := mux.Vars(r)["id"]
 	job, err := api.Resolver.Query().Job(r.Context(), id)
@@ -130,6 +174,8 @@ func (api *RestApi) tagJob(rw http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(rw).Encode(job)
 }
 
+// A new job started. The body should be in the `meta.json` format, but some fields required
+// there are optional here (e.g. `jobState` defaults to "running").
 func (api *RestApi) startJob(rw http.ResponseWriter, r *http.Request) {
 	req := schema.JobMeta{BaseJob: schema.JobDefaults}
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -142,6 +188,7 @@ func (api *RestApi) startJob(rw http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// TODO: Do more such checks, be smarter with them.
 	if len(req.Resources) == 0 || len(req.User) == 0 || req.NumNodes == 0 {
 		http.Error(rw, "required fields are missing", http.StatusBadRequest)
 		return
@@ -193,6 +240,7 @@ func (api *RestApi) startJob(rw http.ResponseWriter, r *http.Request) {
 	})
 }
 
+// A job has stopped and should be archived.
 func (api *RestApi) stopJob(rw http.ResponseWriter, r *http.Request) {
 	req := StopJobApiRequest{}
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -207,10 +255,13 @@ func (api *RestApi) stopJob(rw http.ResponseWriter, r *http.Request) {
 	if ok {
 		sql, args, err = sq.Select(schema.JobColumns...).From("job").Where("job.id = ?", id).ToSql()
 	} else {
-		sql, args, err = sq.Select(schema.JobColumns...).From("job").
+		qb := sq.Select(schema.JobColumns...).From("job").
 			Where("job.job_id = ?", req.JobId).
-			Where("job.cluster = ?", req.Cluster).
-			Where("job.start_time = ?", req.StartTime).ToSql()
+			Where("job.cluster = ?", req.Cluster)
+		if req.StartTime != nil {
+			qb = qb.Where("job.start_time = ?", *req.StartTime)
+		}
+		sql, args, err = qb.ToSql()
 	}
 	if err != nil {
 		http.Error(rw, err.Error(), http.StatusBadRequest)
@@ -234,6 +285,10 @@ func (api *RestApi) stopJob(rw http.ResponseWriter, r *http.Request) {
 		req.State = schema.JobStateCompleted
 	}
 
+	// This closure does the real work. It needs to be its own
+	// function so that it can be done in the background.
+	// TODO: Throttle/Have a max. number or parallel archivngs
+	// or use a long-running goroutine receiving jobs by a channel.
 	doArchiving := func(job *schema.Job, ctx context.Context) error {
 		api.OngoingArchivings.Add(1)
 		defer api.OngoingArchivings.Done()