diff --git a/arkindex/documents/fixtures/data.json b/arkindex/documents/fixtures/data.json
index f1b8f752f3f1c7ca8b7aef2dc292bb203450c778..e2391f33695505a172e99104f349a417e25fcd24 100644
--- a/arkindex/documents/fixtures/data.json
+++ b/arkindex/documents/fixtures/data.json
@@ -1,165 +1,165 @@
 [
 {
     "model": "dataimport.repository",
-    "pk": "6ebe4309-aa8d-4e40-af8f-6db4a0b086f7",
+    "pk": "1a1bb004-df74-44ea-af0f-b21854923882",
     "fields": {
-        "url": "http://my_repo.fake/workers/worker",
-        "type": "worker",
-        "hook_token": "worker-hook-token",
-        "credentials": "9fb76b0e-6529-4c2c-acc4-02d616554102",
+        "url": "http://gitlab/repo",
+        "type": "iiif",
+        "hook_token": "hook-token",
+        "credentials": "c3a461a3-01f8-4c69-905e-0ca37f244d7e",
         "provider_name": "GitLabProvider"
     }
 },
 {
     "model": "dataimport.repository",
-    "pk": "7a51c052-445a-4b37-80d1-2ffa8ca293b9",
+    "pk": "1d8d3e70-bfa0-4fb6-8000-3b10757e3705",
     "fields": {
-        "url": "http://gitlab/repo",
-        "type": "iiif",
-        "hook_token": "hook-token",
-        "credentials": "9fb76b0e-6529-4c2c-acc4-02d616554102",
+        "url": "http://my_repo.fake/workers/worker",
+        "type": "worker",
+        "hook_token": "worker-hook-token",
+        "credentials": "c3a461a3-01f8-4c69-905e-0ca37f244d7e",
         "provider_name": "GitLabProvider"
     }
 },
 {
     "model": "dataimport.revision",
-    "pk": "7a7a1e1d-d1e3-4ea8-a2bb-60ba4af7cab9",
+    "pk": "8d17b4c4-f003-4433-b76b-ee9bd08f94db",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "repo": "7a51c052-445a-4b37-80d1-2ffa8ca293b9",
-        "hash": "42",
-        "message": "a",
-        "author": "me"
+        "repo": "1d8d3e70-bfa0-4fb6-8000-3b10757e3705",
+        "hash": "1337",
+        "message": "My w0rk3r",
+        "author": "Test user"
     }
 },
 {
     "model": "dataimport.revision",
-    "pk": "ffb8a683-836f-4e6a-a59b-17062885330f",
+    "pk": "e30f854c-25da-4694-8fb7-e4c76767ab36",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "repo": "6ebe4309-aa8d-4e40-af8f-6db4a0b086f7",
-        "hash": "1337",
-        "message": "My w0rk3r",
-        "author": "Test user"
+        "repo": "1a1bb004-df74-44ea-af0f-b21854923882",
+        "hash": "42",
+        "message": "a",
+        "author": "me"
     }
 },
 {
     "model": "dataimport.worker",
-    "pk": "1f70863f-fe00-42e9-b8b1-905fa8d88aac",
+    "pk": "48f5e1bb-e9b1-4178-aa9a-4e44b2ceb531",
     "fields": {
-        "name": "Recognizer",
-        "slug": "reco",
-        "type": "recognizer",
-        "repository": "6ebe4309-aa8d-4e40-af8f-6db4a0b086f7"
+        "name": "Document layout analyser",
+        "slug": "dla",
+        "type": "dla",
+        "repository": "1d8d3e70-bfa0-4fb6-8000-3b10757e3705"
     }
 },
 {
     "model": "dataimport.worker",
-    "pk": "851c8902-ca57-42ff-9f16-06b6a8317bbd",
+    "pk": "8fa8be15-58db-4504-9bb4-47c65b833015",
     "fields": {
-        "name": "Document layout analyser",
-        "slug": "dla",
-        "type": "dla",
-        "repository": "6ebe4309-aa8d-4e40-af8f-6db4a0b086f7"
+        "name": "Recognizer",
+        "slug": "reco",
+        "type": "recognizer",
+        "repository": "1d8d3e70-bfa0-4fb6-8000-3b10757e3705"
     }
 },
 {
     "model": "dataimport.workerversion",
-    "pk": "5aeac49b-03b7-4c1c-8593-9d2e27b6a6df",
+    "pk": "84a86b51-82a8-4c39-9d70-52307a6aab35",
     "fields": {
-        "worker": "851c8902-ca57-42ff-9f16-06b6a8317bbd",
-        "revision": "ffb8a683-836f-4e6a-a59b-17062885330f",
+        "worker": "8fa8be15-58db-4504-9bb4-47c65b833015",
+        "revision": "8d17b4c4-f003-4433-b76b-ee9bd08f94db",
         "configuration": {
             "test": 42
         },
         "state": "available",
-        "docker_image": "b795d482-d08d-4599-ae82-db16ea4331e8",
+        "docker_image": "e55e4fb8-65cc-41f3-a464-2e58103d66f4",
         "docker_image_iid": null
     }
 },
 {
     "model": "dataimport.workerversion",
-    "pk": "db7dc219-1cc6-4f2a-a372-14a42e76cf0d",
+    "pk": "f2528da0-4fa7-4984-8482-59d270ab557c",
     "fields": {
-        "worker": "1f70863f-fe00-42e9-b8b1-905fa8d88aac",
-        "revision": "ffb8a683-836f-4e6a-a59b-17062885330f",
+        "worker": "48f5e1bb-e9b1-4178-aa9a-4e44b2ceb531",
+        "revision": "8d17b4c4-f003-4433-b76b-ee9bd08f94db",
         "configuration": {
             "test": 42
         },
         "state": "available",
-        "docker_image": "b795d482-d08d-4599-ae82-db16ea4331e8",
+        "docker_image": "e55e4fb8-65cc-41f3-a464-2e58103d66f4",
         "docker_image_iid": null
     }
 },
 {
     "model": "documents.corpus",
-    "pk": "dab98946-799e-415f-abcb-869cf1bda854",
+    "pk": "951ed1f8-9c0d-47ec-b406-79982dcbbce9",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "name": "Unit Tests",
         "description": "",
-        "repository": "7a51c052-445a-4b37-80d1-2ffa8ca293b9",
+        "repository": "1a1bb004-df74-44ea-af0f-b21854923882",
         "public": true
     }
 },
 {
     "model": "documents.elementtype",
-    "pk": "46ea8eee-f118-4706-a288-084bb64bcee0",
+    "pk": "0d3157fe-5673-4ecb-83dd-ac7151080d8c",
     "fields": {
-        "corpus": "dab98946-799e-415f-abcb-869cf1bda854",
-        "slug": "surface",
-        "display_name": "Surface",
+        "corpus": "951ed1f8-9c0d-47ec-b406-79982dcbbce9",
+        "slug": "page",
+        "display_name": "Page",
         "folder": false
     }
 },
 {
     "model": "documents.elementtype",
-    "pk": "5f84f077-bd8f-4d7f-ab18-e8388fcf0325",
+    "pk": "361fcb21-5c58-4d4f-b148-233e5087926a",
     "fields": {
-        "corpus": "dab98946-799e-415f-abcb-869cf1bda854",
-        "slug": "word",
-        "display_name": "Word",
+        "corpus": "951ed1f8-9c0d-47ec-b406-79982dcbbce9",
+        "slug": "act",
+        "display_name": "Act",
         "folder": false
     }
 },
 {
     "model": "documents.elementtype",
-    "pk": "729a81f4-e38e-4e79-b2dc-eafbd00b447e",
+    "pk": "3b9e0ba4-17ae-4881-a0e0-154bddeda913",
     "fields": {
-        "corpus": "dab98946-799e-415f-abcb-869cf1bda854",
-        "slug": "act",
-        "display_name": "Act",
+        "corpus": "951ed1f8-9c0d-47ec-b406-79982dcbbce9",
+        "slug": "word",
+        "display_name": "Word",
         "folder": false
     }
 },
 {
     "model": "documents.elementtype",
-    "pk": "7b5938ee-dc1e-4e37-890a-1e5988e99099",
+    "pk": "a1a545f3-e4d0-47b0-a56e-6703907dca7f",
     "fields": {
-        "corpus": "dab98946-799e-415f-abcb-869cf1bda854",
-        "slug": "page",
-        "display_name": "Page",
+        "corpus": "951ed1f8-9c0d-47ec-b406-79982dcbbce9",
+        "slug": "text_line",
+        "display_name": "Line",
         "folder": false
     }
 },
 {
     "model": "documents.elementtype",
-    "pk": "97ec5a9a-06fc-4d72-8a11-f107b76af6f2",
+    "pk": "b53547d0-3a8c-4ad8-b576-f8e539d1d485",
     "fields": {
-        "corpus": "dab98946-799e-415f-abcb-869cf1bda854",
-        "slug": "text_line",
-        "display_name": "Line",
+        "corpus": "951ed1f8-9c0d-47ec-b406-79982dcbbce9",
+        "slug": "surface",
+        "display_name": "Surface",
         "folder": false
     }
 },
 {
     "model": "documents.elementtype",
-    "pk": "dc3affbd-6a01-4aea-abce-c9f322698254",
+    "pk": "e05821fd-af1c-4ec6-afec-fc2f6a0fd722",
     "fields": {
-        "corpus": "dab98946-799e-415f-abcb-869cf1bda854",
+        "corpus": "951ed1f8-9c0d-47ec-b406-79982dcbbce9",
         "slug": "volume",
         "display_name": "Volume",
         "folder": true
@@ -167,297 +167,297 @@
 },
 {
     "model": "documents.elementpath",
-    "pk": "0aacf1f9-41d7-4dfc-9d2a-b903e63f035d",
+    "pk": "0042c780-4576-4afb-bf59-575cc879abe6",
     "fields": {
-        "element": "a1c3c97c-2240-4c00-961e-12ca69b627a0",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\"]",
-        "ordering": 1
+        "element": "195f1fe7-4abd-4582-a2d0-900254d71ecf",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\"]",
+        "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "134b9415-c240-4d55-beb0-9adec4b138f8",
+    "pk": "0234cd81-f923-44af-adae-5af0f0ff6f72",
     "fields": {
-        "element": "525de37a-190f-4760-b831-4bf9bd4909f5",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\"]",
-        "ordering": 0
+        "element": "e1020d75-d956-45a0-b933-909f3fc3d91c",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\", \"dc25f77d-167d-4762-b1ac-36ead49181f9\"]",
+        "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "32b3ceb2-a64e-48d6-9429-8b5acdb953a5",
+    "pk": "0de665cf-d830-4635-b08a-421a1cae04f8",
     "fields": {
-        "element": "bcfc8f66-d7a5-48bb-a17e-f08b209911c0",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\", \"bf4d6982-d8c0-4b81-8f49-3352d2ac90ee\"]",
-        "ordering": 0
+        "element": "f8ec061e-1482-4653-aeb1-5db22f286553",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\"]",
+        "ordering": 3
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "50d6646e-c7e3-4c02-a843-aa66abcbc264",
+    "pk": "0ed4caf0-1d15-442f-9fa7-8abda649d34d",
     "fields": {
-        "element": "edb4eec4-4860-446a-977e-acf83c031df9",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\", \"1b2a3adb-3740-49d3-95e7-ce14dfc7da93\"]",
+        "element": "ce6f78ce-0cfc-4cc3-8d4c-6a7b4fe68530",
+        "path": "[\"585a6b5e-b5bc-4632-ad04-e66c0168dab9\"]",
         "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "5e770ea3-3e6f-4f9c-b433-92b2c86da2c8",
+    "pk": "10a2fc43-bfd3-4ccd-ad82-1838a908fe71",
     "fields": {
-        "element": "0f83e510-f4f6-4048-86a4-f314c7f88223",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\"]",
-        "ordering": 4
+        "element": "9c80ae84-94a3-4ddd-97d8-a80fd73af9b2",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\", \"3b9c805e-d190-4bc7-a8b0-2fdae4b6ab9f\"]",
+        "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "5e802dbb-4877-410a-b136-52c9438d03d5",
+    "pk": "15cfde8c-3dec-4bd9-a899-d9be192c5102",
     "fields": {
-        "element": "e9e92536-f98a-4dad-bb7e-0aa7e486b894",
-        "path": "[\"bb910784-dcb4-4b26-aab0-916313c3eb91\"]",
-        "ordering": 1
+        "element": "3b9c805e-d190-4bc7-a8b0-2fdae4b6ab9f",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\"]",
+        "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "6ec3009d-e3ec-41dd-9f27-291f2aeca87b",
+    "pk": "23726b55-ca70-4f4b-895d-d6d879853f75",
     "fields": {
-        "element": "408ff192-649a-4f93-9a1a-0603641b4725",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\"]",
-        "ordering": 2
+        "element": "e8dba6c7-7aa1-4cea-b12f-8aeb58c19da1",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\", \"dc25f77d-167d-4762-b1ac-36ead49181f9\"]",
+        "ordering": 1
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "6fa0b074-35f6-44f2-bf90-585c410cf550",
+    "pk": "28360113-4374-4b33-a912-c324827ba3b8",
     "fields": {
-        "element": "6e829b5f-2f51-4c93-babb-418d5f01c8b0",
-        "path": "[\"bb910784-dcb4-4b26-aab0-916313c3eb91\"]",
+        "element": "eccfe352-bb4f-4dcd-8af5-cbf20ffb7c93",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\", \"4168bf0e-e105-4597-82fb-d44f5f601c42\"]",
         "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "73da7671-4e08-478a-9b89-066e5428ac58",
+    "pk": "297a7af8-40c3-4d3a-b22b-3f69876b07d3",
     "fields": {
-        "element": "a965eed2-b66c-41ec-b8fe-a9fab12eee9e",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\", \"bf4d6982-d8c0-4b81-8f49-3352d2ac90ee\"]",
-        "ordering": 0
+        "element": "82e3e1de-3498-462e-b0fa-294704e09871",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\", \"195f1fe7-4abd-4582-a2d0-900254d71ecf\"]",
+        "ordering": 1
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "74b57d81-ebf5-4135-a82b-6aabc4e74840",
+    "pk": "36208527-e8a2-43c9-8e3b-3901d847fd59",
     "fields": {
-        "element": "eb3bb68f-918b-4b90-90f2-27df023e4772",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\", \"a1c3c97c-2240-4c00-961e-12ca69b627a0\"]",
+        "element": "dc25f77d-167d-4762-b1ac-36ead49181f9",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\"]",
         "ordering": 1
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "8370b7f0-be3b-4e83-937b-b7b383485536",
+    "pk": "44cb8157-22b9-45c8-b40f-177c4c221ccb",
     "fields": {
-        "element": "af5f778a-0b86-4422-8594-91de359aa795",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\", \"525de37a-190f-4760-b831-4bf9bd4909f5\"]",
+        "element": "000f3a0b-0d42-44db-a120-a626f3a1e73b",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\", \"1d8decb9-a27d-4e8c-82a9-e9fe3379790f\"]",
         "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "8c278e8f-8690-4e6f-adf2-560de42e18de",
+    "pk": "4dc656b4-d9e0-491a-b74e-c50d910ef5c5",
     "fields": {
-        "element": "1b2a3adb-3740-49d3-95e7-ce14dfc7da93",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\"]",
-        "ordering": 3
+        "element": "0459e51f-772a-409a-9d30-f2a3d01ab894",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\", \"144551e9-cce8-42e8-bf58-636e7694ed87\"]",
+        "ordering": 0
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "90949826-ca71-42cc-ad6e-3c3c91563f3f",
+    "pk": "544cd902-48f9-4b0c-9451-1aec0be8a694",
     "fields": {
-        "element": "2b33730b-a381-4a99-9463-b4faeb9bfde2",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\", \"ce0dc249-37ee-4e2e-89a4-d1383b25ff8c\"]",
-        "ordering": 0
+        "element": "d258e27f-ebff-40d2-984b-be7a44ce829e",
+        "path": "[\"585a6b5e-b5bc-4632-ad04-e66c0168dab9\"]",
+        "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "93a66f20-d5de-4588-b198-20aa3dfb4fc2",
+    "pk": "642bc3e4-c38b-4440-bda6-2aae2b051e0e",
     "fields": {
-        "element": "ce0dc249-37ee-4e2e-89a4-d1383b25ff8c",
-        "path": "[\"5d4887e4-a9bd-4d75-aa82-0c63a40be1ee\"]",
-        "ordering": 1
+        "element": "144551e9-cce8-42e8-bf58-636e7694ed87",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\"]",
+        "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "95cafbdd-7201-41b0-aeca-76580be557c0",
+    "pk": "72404345-f314-47a4-ac63-53fb950dbc9f",
     "fields": {
-        "element": "a22c9f39-95df-45de-98b9-59a9f358611d",
-        "path": "[\"bb910784-dcb4-4b26-aab0-916313c3eb91\"]",
+        "element": "7392707d-0b72-4f6b-9fb8-943b95ce197b",
+        "path": "[\"9afec968-86bd-4c75-93e9-bf12a463e9df\", \"1d8decb9-a27d-4e8c-82a9-e9fe3379790f\"]",
         "ordering": 2
     }
 },
 {
     "model": "documents.elementpath",
-    "pk": "9e3798f8-c75a-4a5e-a989-a39c1dc43213",
+    "pk": "7d689028-d217-4e84-b06b-7e6e05e551d0",
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@@ -827,7 +827,7 @@
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@@ -838,43 +838,43 @@
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@@ -882,32 +882,32 @@
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@@ -915,32 +915,32 @@
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+        "polygon": "LINEARRING (600 600, 600 1000, 1000 1000, 1000 600, 600 600)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "8f507e13-1f0e-43f4-84ce-44f55fcf187f",
+    "pk": "ae266608-3037-4612-9073-f2320c755e70",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "ce68e28e-8d2a-4e07-901d-791c6eb0dfca",
-        "polygon": "LINEARRING (0 0, 0 600, 600 600, 600 0, 0 0)"
+        "image": "5aa4052e-09c8-4bf3-8d01-5e00c4f7aa7d",
+        "polygon": "LINEARRING (400 400, 400 500, 500 500, 500 400, 400 400)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "a45cba6e-5304-4e60-a6c3-79c1627ded89",
+    "pk": "b16736b8-48f5-48a5-a301-adbb689581cd",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "6538d5fb-5a86-4c34-a974-70c624bba5be",
-        "polygon": "LINEARRING (600 600, 600 1000, 1000 1000, 1000 600, 600 600)"
+        "image": "109c86ef-e898-410a-a141-86556c4b134a",
+        "polygon": "LINEARRING (0 0, 0 1000, 1000 1000, 1000 0, 0 0)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "c8fc9430-cdd3-46ce-a045-957c8132b4d2",
+    "pk": "b9e8a058-a124-443d-825a-05e60e1a29ee",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "ce68e28e-8d2a-4e07-901d-791c6eb0dfca",
-        "polygon": "LINEARRING (0 0, 0 1000, 1000 1000, 1000 0, 0 0)"
+        "image": "97bbe1d5-82c1-4179-8acd-4647b3e7aeef",
+        "polygon": "LINEARRING (400 400, 400 500, 500 500, 500 400, 400 400)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "ca0b6bd5-75d4-4ec2-b559-5a5919354e29",
+    "pk": "bddb803a-c25b-43b0-ab03-880af6568397",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "6538d5fb-5a86-4c34-a974-70c624bba5be",
-        "polygon": "LINEARRING (700 700, 700 800, 800 800, 800 700, 700 700)"
+        "image": "97bbe1d5-82c1-4179-8acd-4647b3e7aeef",
+        "polygon": "LINEARRING (100 100, 100 200, 200 200, 200 100, 100 100)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "ca56ae53-3a8b-4064-bef4-482773738b29",
+    "pk": "ef5fead8-f5dd-44c6-9da7-4bd05cf5c695",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "6538d5fb-5a86-4c34-a974-70c624bba5be",
-        "polygon": "LINEARRING (400 400, 400 500, 500 500, 500 400, 400 400)"
+        "image": "fabf9757-1bfc-4e4f-b374-dcbc9b1ac585",
+        "polygon": "LINEARRING (0 0, 0 1000, 1000 1000, 1000 0, 0 0)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "d885b67c-01fc-4254-9eea-81da4ec62102",
+    "pk": "fcc13de0-6c9e-49ce-8524-8112c7aa454c",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "ce68e28e-8d2a-4e07-901d-791c6eb0dfca",
-        "polygon": "LINEARRING (100 100, 100 200, 200 200, 200 100, 100 100)"
+        "image": "97bbe1d5-82c1-4179-8acd-4647b3e7aeef",
+        "polygon": "LINEARRING (700 700, 700 800, 800 800, 800 700, 700 700)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "e41a5920-3078-4772-a83d-e05f05a9678f",
+    "pk": "ff3fc33f-4a14-4e2d-8c78-69c627952aef",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "6538d5fb-5a86-4c34-a974-70c624bba5be",
-        "polygon": "LINEARRING (0 0, 0 300, 300 300, 300 0, 0 0)"
+        "image": "4db60629-45d7-4932-b710-ace0604a99ff",
+        "polygon": "LINEARRING (0 0, 0 1000, 1000 1000, 1000 0, 0 0)"
     }
 },
 {
     "model": "images.zone",
-    "pk": "ea52165e-7d7d-41af-b29f-b8774955626a",
+    "pk": "ffc2612e-481b-423f-a902-3538d29542de",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "image": "6538d5fb-5a86-4c34-a974-70c624bba5be",
-        "polygon": "LINEARRING (0 0, 0 1000, 1000 1000, 1000 0, 0 0)"
+        "image": "97bbe1d5-82c1-4179-8acd-4647b3e7aeef",
+        "polygon": "LINEARRING (300 300, 300 600, 600 600, 600 300, 300 300)"
     }
 },
 {
     "model": "users.user",
     "pk": 1,
     "fields": {
-        "password": "pbkdf2_sha256$216000$SDRlvrKm5YOT$XxAljMHH19WWQzwUySlDiOTtKJe+TPhSITW6zo/I7xI=",
+        "password": "pbkdf2_sha256$216000$WzKWfycXMEFX$AytsezJmnXNWhDh3P7ko1Y/jhRGWISGPhDD1FUxtsPM=",
         "last_login": null,
         "email": "root@root.fr",
         "display_name": "Admin",
@@ -1435,7 +1435,7 @@
     "model": "users.user",
     "pk": 2,
     "fields": {
-        "password": "pbkdf2_sha256$216000$CYynh60McAI6$SSlHKy0tGvxBBd/zzG1hc1zNEqhaNtv5rrH2M0ATgpY=",
+        "password": "pbkdf2_sha256$216000$SgEz2rqLb3sp$vVHBOzpAuI9KQZajsa541ACnWd7rnk2oAoDRCZ2NILg=",
         "last_login": null,
         "email": "internal@internal.fr",
         "display_name": "Internal user",
@@ -1450,7 +1450,7 @@
     "model": "users.user",
     "pk": 3,
     "fields": {
-        "password": "pbkdf2_sha256$216000$tGXE4KnOaN1S$O89hFVWrOj/YC22CvXIrTMaDBWYAfdOGpc1H1wkCSLQ=",
+        "password": "pbkdf2_sha256$216000$WMidgXB71uY1$eKhRaj459aaoyBTtT/SmiQou7WS+MhV7jkTUjVIzdBU=",
         "last_login": null,
         "email": "user@user.fr",
         "display_name": "Test user",
@@ -1493,7 +1493,7 @@
 },
 {
     "model": "users.group",
-    "pk": "3d43ed61-ef7e-4eaa-8e31-83bdf7083256",
+    "pk": "6e2ca3c1-c24d-44b2-a207-f88e8c9ceb26",
     "fields": {
         "name": "User group",
         "public": false
@@ -1501,34 +1501,34 @@
 },
 {
     "model": "users.membership",
-    "pk": 1,
+    "pk": "252797d5-9dc8-43a3-a790-2bb643dfd6b3",
     "fields": {
-        "user": 3,
-        "group": "3d43ed61-ef7e-4eaa-8e31-83bdf7083256",
-        "level": 100
+        "user": 5,
+        "group": "6e2ca3c1-c24d-44b2-a207-f88e8c9ceb26",
+        "level": 10
     }
 },
 {
     "model": "users.membership",
-    "pk": 2,
+    "pk": "661e312b-f8a5-4557-bba2-84286a208fe5",
     "fields": {
-        "user": 4,
-        "group": "3d43ed61-ef7e-4eaa-8e31-83bdf7083256",
-        "level": 50
+        "user": 3,
+        "group": "6e2ca3c1-c24d-44b2-a207-f88e8c9ceb26",
+        "level": 100
     }
 },
 {
     "model": "users.membership",
-    "pk": 3,
+    "pk": "88dc4c4b-0f2a-48b2-a02b-ea7f22ced745",
     "fields": {
-        "user": 5,
-        "group": "3d43ed61-ef7e-4eaa-8e31-83bdf7083256",
-        "level": 10
+        "user": 4,
+        "group": "6e2ca3c1-c24d-44b2-a207-f88e8c9ceb26",
+        "level": 50
     }
 },
 {
     "model": "users.oauthcredentials",
-    "pk": "9fb76b0e-6529-4c2c-acc4-02d616554102",
+    "pk": "c3a461a3-01f8-4c69-905e-0ca37f244d7e",
     "fields": {
         "user": 3,
         "provider_name": "gitlab",
@@ -1545,7 +1545,7 @@
     "pk": 1,
     "fields": {
         "user": 3,
-        "corpus": "dab98946-799e-415f-abcb-869cf1bda854",
+        "corpus": "951ed1f8-9c0d-47ec-b406-79982dcbbce9",
         "can_write": true,
         "can_admin": true
     }
@@ -3244,7 +3244,7 @@
 },
 {
     "model": "ponos.workflow",
-    "pk": "17abc122-a22d-4788-b8ae-8a6f576e55ed",
+    "pk": "d6d653a7-105e-4055-b4e1-ee7a85ffa375",
     "fields": {
         "recipe": "tasks:\n docker_build:\n  image: reco",
         "created": "2020-02-02T01:23:45.678Z",
@@ -3253,7 +3253,7 @@
 },
 {
     "model": "ponos.task",
-    "pk": "b579d90f-b7f1-49ff-b30d-06671078ea01",
+    "pk": "43f65c92-f06c-4ad5-969c-8eda3cea20e0",
     "fields": {
         "run": 0,
         "depth": 0,
@@ -3266,7 +3266,8 @@
         "has_docker_socket": false,
         "image_artifact": null,
         "agent": null,
-        "workflow": "17abc122-a22d-4788-b8ae-8a6f576e55ed",
+        "gpu": null,
+        "workflow": "d6d653a7-105e-4055-b4e1-ee7a85ffa375",
         "container": null,
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
@@ -3275,9 +3276,9 @@
 },
 {
     "model": "ponos.artifact",
-    "pk": "b795d482-d08d-4599-ae82-db16ea4331e8",
+    "pk": "e55e4fb8-65cc-41f3-a464-2e58103d66f4",
     "fields": {
-        "task": "b579d90f-b7f1-49ff-b30d-06671078ea01",
+        "task": "43f65c92-f06c-4ad5-969c-8eda3cea20e0",
         "path": "/path/to/docker_build",
         "size": 42000,
         "content_type": "application/octet-stream",
diff --git a/arkindex/users/serializers.py b/arkindex/users/serializers.py
index 7073c920789a1d73b77c7b49fb5567f49685710a..bb714c8c8d689cb0282f71582b15951f6da226d4 100644
--- a/arkindex/users/serializers.py
+++ b/arkindex/users/serializers.py
@@ -288,7 +288,6 @@ class MemberSerializer(MembershipSerializer):
     """
     Serialize the user of a group with its member privilege level
     """
-    id = serializers.IntegerField(read_only=True)
     email = serializers.EmailField(source='user.email')
     display_name = serializers.StringRelatedField(source='user.display_name', read_only=True)
     level = serializers.IntegerField(min_value=0, max_value=100)
diff --git a/arkindex/users/tests/test_membership.py b/arkindex/users/tests/test_membership.py
index 35c93e4f7382a33d483bc01c9ccd107436b45f0c..66c168e6af03cbfbe0f6beed6a29871d3413813d 100644
--- a/arkindex/users/tests/test_membership.py
+++ b/arkindex/users/tests/test_membership.py
@@ -140,17 +140,17 @@ class TestMembership(FixtureAPITestCase):
                 {
                     'display_name': 'Test user',
                     'email': admin_member.user.email,
-                    'id': admin_member.id,
+                    'id': str(admin_member.id),
                     'level': Group.ADMIN_LEVEL
                 }, {
                     'display_name': 'Test user read',
                     'email': read_member.user.email,
-                    'id': read_member.id,
+                    'id': str(read_member.id),
                     'level': read_member.level
                 }, {
                     'display_name': 'Test user write',
                     'email': write_member.user.email,
-                    'id': write_member.id,
+                    'id': str(write_member.id),
                     'level': write_member.level
                 }
             ]
@@ -196,7 +196,7 @@ class TestMembership(FixtureAPITestCase):
         payload = {
             'name': 'Renamed group',
             'public': True,
-            'id': 1337,
+            'id': uuid.uuid4(),
             'members_count': 42
         }
         self.client.force_login(self.user)
@@ -274,7 +274,7 @@ class TestMembership(FixtureAPITestCase):
                             'name': 'Another group',
                             'public': False
                         },
-                    'id': new_group_member.id,
+                    'id': str(new_group_member.id),
                     'level': new_group_member.level
                 },
                 {
@@ -285,7 +285,7 @@ class TestMembership(FixtureAPITestCase):
                             'name': self.group.name,
                             'public': self.group.public
                         },
-                    'id': member.id,
+                    'id': str(member.id),
                     'level': member.level
                 }
             ]
@@ -408,6 +408,6 @@ class TestMembership(FixtureAPITestCase):
         self.assertDictEqual(response.json(), {
             'display_name': user.display_name,
             'email': user.email,
-            'id': membership.id,
+            'id': str(membership.id),
             'level': 10
         })