diff --git a/arkindex/documents/export/classification.sql b/arkindex/documents/export/classification.sql
index 9cb1acb1cfc5371e3be696de9d249862b95ec6e2..c534831f0a903219957836ed783711e494f9d680 100644
--- a/arkindex/documents/export/classification.sql
+++ b/arkindex/documents/export/classification.sql
@@ -7,7 +7,6 @@ SELECT
     classification.confidence,
     -- SQLite has no boolean type, so high_confidence becomes an integer (0 or 1)
     classification.high_confidence::integer,
-    classification.worker_version_id,
     classification.worker_run_id
 FROM documents_classification classification
 INNER JOIN documents_element element ON (element.id = classification.element_id)
diff --git a/arkindex/documents/export/element.sql b/arkindex/documents/export/element.sql
index 3c6c1a7d1feb0116ad7bb0a4f0ab86c5aa16d810..f8cc7077a202673fc1833343cfcb1886b7288241 100644
--- a/arkindex/documents/export/element.sql
+++ b/arkindex/documents/export/element.sql
@@ -10,7 +10,6 @@ SELECT
     element.image_id,
     element.rotation_angle,
     element.mirrored::integer,
-    element.worker_version_id,
     element.worker_run_id,
     element.confidence
 FROM documents_element element
diff --git a/arkindex/documents/export/entity.sql b/arkindex/documents/export/entity.sql
index 8949691cf68c210f2baa2cbb220598b5911a2d1b..95c9da1c44e77de0eeab272f2b68357482a76703 100644
--- a/arkindex/documents/export/entity.sql
+++ b/arkindex/documents/export/entity.sql
@@ -5,7 +5,6 @@ SELECT
     entity.validated::integer,
     moderator.email,
     hstore_to_json(entity.metas),
-    entity.worker_version_id,
     entity.worker_run_id
 FROM documents_entity entity
 LEFT JOIN users_user moderator ON (moderator.id = entity.moderator_id)
diff --git a/arkindex/documents/export/indexes.sql b/arkindex/documents/export/indexes.sql
index dc75e7cfc1244555d274b6d1c7b16268d65a231d..656b23ff143c3256b9d53b7b7e7bf29cecb17dc0 100644
--- a/arkindex/documents/export/indexes.sql
+++ b/arkindex/documents/export/indexes.sql
@@ -3,32 +3,26 @@ CREATE INDEX image_server_id ON image (server_id);
 CREATE INDEX worker_run_worker_version_id ON worker_run (worker_version_id);
 
 CREATE INDEX element_image_id ON element (image_id);
-CREATE INDEX element_worker_version_id ON element (worker_version_id);
 CREATE INDEX element_worker_run_id ON element (worker_run_id);
 
 CREATE INDEX element_path_parent_id ON element_path (parent_id);
 CREATE INDEX element_path_child_id ON element_path (child_id);
 
 CREATE INDEX transcription_element_id ON transcription (element_id);
-CREATE INDEX transcription_worker_version_id ON transcription (worker_version_id);
 CREATE INDEX transcription_worker_run_id ON transcription (worker_run_id);
 
 CREATE INDEX classification_element_id ON classification (element_id);
-CREATE INDEX classification_worker_version_id ON classification (worker_version_id);
 CREATE INDEX classification_worker_run_id ON classification (worker_run_id);
 
-CREATE INDEX entity_worker_version_id ON entity (worker_version_id);
 CREATE INDEX entity_worker_run_id ON entity (worker_run_id);
 CREATE INDEX entity_type_id ON entity (type_id);
 
 CREATE INDEX transcription_entity_transcription_id ON transcription_entity (transcription_id);
 CREATE INDEX transcription_entity_entity_id ON transcription_entity (entity_id);
-CREATE INDEX transcription_entity_worker_version_id ON transcription_entity (worker_version_id);
 CREATE INDEX transcription_entity_worker_run_id ON transcription_entity (worker_run_id);
 
 CREATE INDEX metadata_element_id ON metadata (element_id);
 CREATE INDEX metadata_entity_id ON metadata (entity_id);
-CREATE INDEX metadata_worker_version_id ON metadata (worker_version_id);
 CREATE INDEX metadata_worker_run_id ON metadata (worker_run_id);
 
 CREATE INDEX dataset_element_element_id ON dataset_element (element_id);
diff --git a/arkindex/documents/export/metadata.sql b/arkindex/documents/export/metadata.sql
index 714b73b208263ca2026caa7a9226113315d25125..5b4d21b7a896a5eea7666c034a398de71f55504c 100644
--- a/arkindex/documents/export/metadata.sql
+++ b/arkindex/documents/export/metadata.sql
@@ -5,7 +5,6 @@ SELECT
     metadata.type,
     metadata.value,
     metadata.entity_id,
-    metadata.worker_version_id,
     metadata.worker_run_id
 FROM documents_metadata metadata
 INNER JOIN documents_element element ON (element.id = metadata.element_id)
diff --git a/arkindex/documents/export/structure.sql b/arkindex/documents/export/structure.sql
index f640ed8bbcfd005ea5ffdbdec6143cd1513c4186..b3eca511e3689527efa56d9c459b30eabe9c6c9f 100644
--- a/arkindex/documents/export/structure.sql
+++ b/arkindex/documents/export/structure.sql
@@ -62,18 +62,15 @@ CREATE TABLE element (
     image_id VARCHAR(37),
     rotation_angle INTEGER NOT NULL DEFAULT 0,
     mirrored INTEGER NOT NULL DEFAULT 0,
-    worker_version_id VARCHAR(37),
     worker_run_id VARCHAR(37),
     confidence REAL,
     PRIMARY KEY (id),
     FOREIGN KEY (image_id) REFERENCES image (id) ON DELETE CASCADE,
-    FOREIGN KEY (worker_version_id) REFERENCES worker_version (id) ON DELETE CASCADE,
     FOREIGN KEY (worker_run_id) REFERENCES worker_run (id) ON DELETE CASCADE,
     CHECK ((image_id IS NULL AND polygon IS NULL) OR (image_id IS NOT NULL AND polygon IS NOT NULL)),
     CHECK (rotation_angle >= 0 AND rotation_angle <= 359),
     CHECK (mirrored = 0 OR mirrored = 1),
-    CHECK (confidence IS NULL OR (confidence >= 0 AND confidence <= 1)),
-    CHECK (worker_run_id IS NULL OR worker_version_id IS NOT NULL)
+    CHECK (confidence IS NULL OR (confidence >= 0 AND confidence <= 1))
 );
 
 CREATE TABLE element_path (
@@ -94,11 +91,9 @@ CREATE TABLE transcription (
     text TEXT NOT NULL,
     confidence REAL,
     orientation TEXT NOT NULL DEFAULT 'horizontal-lr',
-    worker_version_id VARCHAR(37),
     worker_run_id VARCHAR(37),
     PRIMARY KEY (id),
     FOREIGN KEY (element_id) REFERENCES element (id) ON DELETE CASCADE,
-    FOREIGN KEY (worker_version_id) REFERENCES worker_version (id) ON DELETE CASCADE,
     FOREIGN KEY (worker_run_id) REFERENCES worker_run (id) ON DELETE CASCADE,
     CHECK (confidence IS NULL OR (confidence >= 0 AND confidence <= 1)),
     CHECK (orientation IN ('horizontal-lr', 'horizontal-rl', 'vertical-lr', 'vertical-rl'))
@@ -112,15 +107,12 @@ CREATE TABLE classification (
     moderator VARCHAR(255),
     confidence REAL NOT NULL,
     high_confidence INTEGER NOT NULL DEFAULT 0,
-    worker_version_id VARCHAR(37),
     worker_run_id VARCHAR(37),
     PRIMARY KEY (id),
     FOREIGN KEY (element_id) REFERENCES element (id) ON DELETE CASCADE,
-    FOREIGN KEY (worker_version_id) REFERENCES worker_version (id) ON DELETE CASCADE,
     FOREIGN KEY (worker_run_id) REFERENCES worker_run (id) ON DELETE CASCADE,
     CHECK (confidence >= 0 AND confidence <= 1),
-    CHECK (high_confidence = 0 OR high_confidence = 1),
-    CHECK (worker_run_id IS NULL OR worker_version_id IS NOT NULL)
+    CHECK (high_confidence = 0 OR high_confidence = 1)
 );
 
 CREATE TABLE entity (
@@ -130,14 +122,11 @@ CREATE TABLE entity (
     validated INTEGER NOT NULL DEFAULT 0,
     moderator VARCHAR(255),
     metas TEXT,
-    worker_version_id VARCHAR(37),
     worker_run_id VARCHAR(37),
     PRIMARY KEY (id),
-    FOREIGN KEY (worker_version_id) REFERENCES worker_version (id) ON DELETE CASCADE,
     FOREIGN KEY (worker_run_id) REFERENCES worker_run (id) ON DELETE CASCADE,
     FOREIGN KEY (type_id) REFERENCES entity_type (id) ON DELETE CASCADE,
-    CHECK (validated = 0 OR validated = 1),
-    CHECK (worker_run_id IS NULL OR worker_version_id IS NOT NULL)
+    CHECK (validated = 0 OR validated = 1)
 );
 
 CREATE TABLE entity_type (
@@ -154,18 +143,15 @@ CREATE TABLE transcription_entity (
     entity_id VARCHAR(37) NOT NULL,
     offset INTEGER NOT NULL,
     length INTEGER NOT NULL,
-    worker_version_id VARCHAR(37),
     worker_run_id VARCHAR(37),
     confidence REAL,
     PRIMARY KEY (id),
     FOREIGN KEY (transcription_id) REFERENCES transcription (id) ON DELETE CASCADE,
     FOREIGN KEY (entity_id) REFERENCES entity (id) ON DELETE CASCADE,
-    FOREIGN KEY (worker_version_id) REFERENCES worker_version (id) ON DELETE CASCADE,
     FOREIGN KEY (worker_run_id) REFERENCES worker_run (id) ON DELETE CASCADE,
-    UNIQUE (transcription_id, entity_id, offset, length, worker_version_id, worker_run_id),
+    UNIQUE (transcription_id, entity_id, offset, length, worker_run_id),
     CHECK (offset >= 0 AND length >= 0),
-    CHECK (confidence IS NULL OR (confidence >= 0 AND confidence <= 1)),
-    CHECK (worker_run_id IS NULL OR worker_version_id IS NOT NULL)
+    CHECK (confidence IS NULL OR (confidence >= 0 AND confidence <= 1))
 );
 
 CREATE TABLE metadata (
@@ -175,14 +161,11 @@ CREATE TABLE metadata (
     type VARCHAR(50) NOT NULL,
     value TEXT NOT NULL,
     entity_id VARCHAR(37),
-    worker_version_id VARCHAR(37),
     worker_run_id VARCHAR(37),
     PRIMARY KEY (id),
     FOREIGN KEY (element_id) REFERENCES element (id) ON DELETE CASCADE,
     FOREIGN KEY (entity_id) REFERENCES entity (id) ON DELETE SET NULL,
-    FOREIGN KEY (worker_version_id) REFERENCES worker_version (id) ON DELETE CASCADE,
-    FOREIGN KEY (worker_run_id) REFERENCES worker_run (id) ON DELETE CASCADE,
-    CHECK (worker_run_id IS NULL OR worker_version_id IS NOT NULL)
+    FOREIGN KEY (worker_run_id) REFERENCES worker_run (id) ON DELETE CASCADE
 );
 
 CREATE TABLE dataset (
diff --git a/arkindex/documents/export/transcription.sql b/arkindex/documents/export/transcription.sql
index 0f71045d41b7c5774401390fa7958da2315fa20c..b06c82e25d95ee62775126c6e45ec659ed182ca8 100644
--- a/arkindex/documents/export/transcription.sql
+++ b/arkindex/documents/export/transcription.sql
@@ -4,7 +4,6 @@ SELECT
     transcription.text,
     transcription.confidence,
     transcription.orientation,
-    transcription.worker_version_id,
     transcription.worker_run_id
 FROM documents_transcription transcription
 INNER JOIN documents_element element ON (element.id = transcription.element_id)
diff --git a/arkindex/documents/export/transcription_entity.sql b/arkindex/documents/export/transcription_entity.sql
index 52c9984de6d78437e5ada3481baf7a669150cfc8..c31d1535391e9411f022839f5a28ee5cb5c48c25 100644
--- a/arkindex/documents/export/transcription_entity.sql
+++ b/arkindex/documents/export/transcription_entity.sql
@@ -6,7 +6,6 @@ SELECT
     te.entity_id,
     te.offset,
     te.length,
-    te.worker_version_id,
     te.worker_run_id,
     te.confidence
 FROM documents_transcriptionentity te
diff --git a/arkindex/documents/export/worker_version.sql b/arkindex/documents/export/worker_version.sql
index 381bdf19e6c3c0bc7b47370593b75dd1d26d5f67..b99e66ea6a983ac333d11b74714eb3e632411a3d 100644
--- a/arkindex/documents/export/worker_version.sql
+++ b/arkindex/documents/export/worker_version.sql
@@ -3,33 +3,34 @@
 -- fills up the RAM.  Adding DISTINCT to all the SELECT queries of the UNION
 -- slows this query down by ~20%.  Using multiple INs instead of a UNION makes
 -- this query twice as slow.
-SELECT version.id, worker.name, worker.slug, workertype.slug, version.version, revision.hash, repository.url
-FROM process_workerversion version
+SELECT DISTINCT version.id, worker.name, worker.slug, workertype.slug, version.version, revision.hash, repository.url
+FROM process_workerrun run
+INNER JOIN process_workerversion version ON (run.version_id = version.id)
 INNER JOIN process_worker worker ON (version.worker_id = worker.id)
 INNER JOIN process_workertype workertype ON (worker.type_id = workertype.id)
 LEFT JOIN process_repository repository ON (worker.repository_id = repository.id)
 LEFT JOIN process_revision revision ON (version.revision_id = revision.id)
-WHERE version.id IN (
-    SELECT worker_version_id FROM documents_element WHERE corpus_id = '{corpus_id}'::uuid
+WHERE run.id IN (
+    SELECT worker_run_id FROM documents_element WHERE corpus_id = '{corpus_id}'::uuid
 UNION
-    SELECT worker_version_id FROM documents_entity WHERE corpus_id = '{corpus_id}'::uuid
+    SELECT worker_run_id FROM documents_entity WHERE corpus_id = '{corpus_id}'::uuid
 UNION
-    SELECT classification.worker_version_id
+    SELECT classification.worker_run_id
     FROM documents_classification classification
     INNER JOIN documents_element element ON (element.id = classification.element_id)
     WHERE element.corpus_id = '{corpus_id}'::uuid
 UNION
-    SELECT transcription.worker_version_id
+    SELECT transcription.worker_run_id
     FROM documents_transcription transcription
     INNER JOIN documents_element element ON (element.id = transcription.element_id)
     WHERE element.corpus_id = '{corpus_id}'::uuid
 UNION
-    SELECT te.worker_version_id
+    SELECT te.worker_run_id
     FROM documents_transcriptionentity te
     INNER JOIN documents_entity entity ON (te.entity_id = entity.id)
     WHERE entity.corpus_id = '{corpus_id}'::uuid
 UNION
-    SELECT md.worker_version_id
+    SELECT md.worker_run_id
     FROM documents_metadata md
     INNER JOIN documents_element element ON (md.element_id = element.id)
     WHERE element.corpus_id = '{corpus_id}'::uuid
diff --git a/arkindex/documents/fixtures/data.json b/arkindex/documents/fixtures/data.json
index 2e0128bc2c0270be8c7833ae9636d5d59c280c54..d94044f342db476770198e0d1613549f345080a9 100644
--- a/arkindex/documents/fixtures/data.json
+++ b/arkindex/documents/fixtures/data.json
@@ -1,7 +1,7 @@
 [
 {
     "model": "process.process",
-    "pk": "16c067b2-dd65-4960-bd2d-d2a04ac8f898",
+    "pk": "0be71517-084c-435b-be54-8dba120c86fd",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
@@ -29,18 +29,18 @@
 },
 {
     "model": "process.process",
-    "pk": "917dc05e-df5f-4ff4-8a17-d8815e644d33",
+    "pk": "74b5620c-6d18-4ac6-b685-f900c5d6c19d",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "name": "Process fixture",
+        "name": null,
         "creator": 2,
-        "corpus": "044e41fa-d1d1-4a9e-a59b-02a78c681dae",
-        "mode": "workers",
+        "corpus": null,
+        "mode": "local",
         "activity_state": "disabled",
         "started": null,
         "finished": null,
-        "farm": "2ef1cf21-aef3-4aea-832f-f3b480ce3a61",
+        "farm": null,
         "element": null,
         "folder_type": null,
         "element_type": null,
@@ -57,18 +57,18 @@
 },
 {
     "model": "process.process",
-    "pk": "d71398a6-289f-4f6b-b2d4-66a442329949",
+    "pk": "d4cada0d-d5b3-48ed-bffc-db53c8cf5e75",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "name": null,
+        "name": "Process fixture",
         "creator": 2,
-        "corpus": null,
-        "mode": "local",
+        "corpus": "12944eab-1b0e-4653-aa66-4c0231e722bf",
+        "mode": "workers",
         "activity_state": "disabled",
         "started": null,
         "finished": null,
-        "farm": null,
+        "farm": "283c0517-96d3-4f61-8847-7245b131ad32",
         "element": null,
         "folder_type": null,
         "element_type": null,
@@ -85,11 +85,11 @@
 },
 {
     "model": "process.worker",
-    "pk": "4de9956e-7d09-4aa3-b953-f8ddaef03cde",
+    "pk": "25d91339-d832-4d88-a9f9-a1888577964a",
     "fields": {
-        "name": "File import",
-        "slug": "file_import",
-        "type": "d5e68ae6-dc01-4f25-979e-b1af90b443bd",
+        "name": "Custom worker",
+        "slug": "custom",
+        "type": "e50aaede-98de-439a-bc81-30996d467a35",
         "description": "",
         "repository": null,
         "public": false,
@@ -98,11 +98,11 @@
 },
 {
     "model": "process.worker",
-    "pk": "9c82784a-7375-4027-9933-bf987c55a461",
+    "pk": "373d2b71-e62c-48d5-bbbb-5ad0a7b350db",
     "fields": {
-        "name": "Custom worker",
-        "slug": "custom",
-        "type": "bd476bd6-d868-49b5-b863-e4c34645497c",
+        "name": "Recognizer",
+        "slug": "reco",
+        "type": "9a219473-8d92-4dfe-8888-5a4b447581e3",
         "description": "",
         "repository": null,
         "public": false,
@@ -111,11 +111,11 @@
 },
 {
     "model": "process.worker",
-    "pk": "9d81875d-4299-44f2-bb93-6c154a8bdc48",
+    "pk": "39e29762-5353-4cde-b909-964a87584224",
     "fields": {
-        "name": "Worker requiring a GPU",
-        "slug": "worker-gpu",
-        "type": "e1475345-e858-46e2-a730-dd7cd8c61d2a",
+        "name": "Document layout analyser",
+        "slug": "dla",
+        "type": "0137a4d7-e9fa-4e5c-b91c-7d3cdb16f53c",
         "description": "",
         "repository": null,
         "public": false,
@@ -124,11 +124,11 @@
 },
 {
     "model": "process.worker",
-    "pk": "a73fb242-c599-4051-9d67-46a73bed4490",
+    "pk": "3d6138ea-96cd-47ad-bb51-02eae6120a37",
     "fields": {
-        "name": "Document layout analyser",
-        "slug": "dla",
-        "type": "96ee14e4-3189-416c-8d95-4ab97cf48f14",
+        "name": "Elements Initialisation Worker",
+        "slug": "initialisation",
+        "type": "30c46054-6ef6-407e-8490-1c9e0e80e29b",
         "description": "",
         "repository": null,
         "public": false,
@@ -137,11 +137,11 @@
 },
 {
     "model": "process.worker",
-    "pk": "b02cd1fc-85d3-4f3b-a1e6-805f7ee7a4e6",
+    "pk": "5cd08382-8a64-499a-a648-12c5bc0509d2",
     "fields": {
-        "name": "Recognizer",
-        "slug": "reco",
-        "type": "a71b8c19-5f3d-41ac-98f4-c0b523e5efc6",
+        "name": "Worker requiring a GPU",
+        "slug": "worker-gpu",
+        "type": "09be5419-06d7-44ef-9147-692290f9d6f1",
         "description": "",
         "repository": null,
         "public": false,
@@ -150,11 +150,11 @@
 },
 {
     "model": "process.worker",
-    "pk": "e3f226c1-9518-4970-b8f5-d884b8a52c1b",
+    "pk": "651dd631-7904-4ba7-a1f7-f4789f938e63",
     "fields": {
-        "name": "Elements Initialisation Worker",
-        "slug": "initialisation",
-        "type": "e1ec3043-fc47-448b-b6d8-fa2696a89aa9",
+        "name": "File import",
+        "slug": "file_import",
+        "type": "627f9595-3f0c-4ca1-bc7a-f8274de8030c",
         "description": "",
         "repository": null,
         "public": false,
@@ -163,11 +163,11 @@
 },
 {
     "model": "process.worker",
-    "pk": "ffc1c283-c222-441b-8387-ef7045d95e37",
+    "pk": "7d080fa4-f74c-40c2-8b30-b20da5a459c2",
     "fields": {
         "name": "Generic worker with a Model",
         "slug": "generic",
-        "type": "a71b8c19-5f3d-41ac-98f4-c0b523e5efc6",
+        "type": "9a219473-8d92-4dfe-8888-5a4b447581e3",
         "description": "",
         "repository": null,
         "public": false,
@@ -176,7 +176,7 @@
 },
 {
     "model": "process.workertype",
-    "pk": "96ee14e4-3189-416c-8d95-4ab97cf48f14",
+    "pk": "0137a4d7-e9fa-4e5c-b91c-7d3cdb16f53c",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
@@ -186,27 +186,27 @@
 },
 {
     "model": "process.workertype",
-    "pk": "a71b8c19-5f3d-41ac-98f4-c0b523e5efc6",
+    "pk": "09be5419-06d7-44ef-9147-692290f9d6f1",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "slug": "recognizer",
-        "display_name": "Recognizer"
+        "slug": "worker",
+        "display_name": "Worker requiring a GPU"
     }
 },
 {
     "model": "process.workertype",
-    "pk": "bd476bd6-d868-49b5-b863-e4c34645497c",
+    "pk": "30c46054-6ef6-407e-8490-1c9e0e80e29b",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "slug": "custom",
-        "display_name": "Custom"
+        "slug": "init",
+        "display_name": "Elements Initialisation"
     }
 },
 {
     "model": "process.workertype",
-    "pk": "d5e68ae6-dc01-4f25-979e-b1af90b443bd",
+    "pk": "627f9595-3f0c-4ca1-bc7a-f8274de8030c",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
@@ -216,36 +216,36 @@
 },
 {
     "model": "process.workertype",
-    "pk": "e1475345-e858-46e2-a730-dd7cd8c61d2a",
+    "pk": "9a219473-8d92-4dfe-8888-5a4b447581e3",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "slug": "worker",
-        "display_name": "Worker requiring a GPU"
+        "slug": "recognizer",
+        "display_name": "Recognizer"
     }
 },
 {
     "model": "process.workertype",
-    "pk": "e1ec3043-fc47-448b-b6d8-fa2696a89aa9",
+    "pk": "e50aaede-98de-439a-bc81-30996d467a35",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "slug": "init",
-        "display_name": "Elements Initialisation"
+        "slug": "custom",
+        "display_name": "Custom"
     }
 },
 {
     "model": "process.workerversion",
-    "pk": "3abbeb14-d57a-4aa9-bf02-b02c30b6a756",
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-        "gpu_usage": "disabled",
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         "created": "2020-02-02T01:23:45.678Z",
@@ -254,17 +254,17 @@
 },
 {
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+        "gpu_usage": "disabled",
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         "updated": "2020-02-02T01:23:45.678Z"
@@ -272,12 +272,14 @@
 },
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@@ -288,27 +290,25 @@
 },
 {
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-        "state": "created",
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         "model_usage": "disabled",
-        "docker_image_iid": null,
+        "docker_image_iid": "registry.somewhere.com/something:latest",
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 },
 {
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-    "pk": "d2534c7f-b6fa-4c99-90e4-6ee49c778d49",
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@@ -326,27 +326,27 @@
 },
 {
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         "version": 1,
         "configuration": {
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+            "custom": "value"
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+        "state": "created",
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         "model_usage": "disabled",
-        "docker_image_iid": "registry.somewhere.com/something:latest",
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 },
 {
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@@ -354,7 +354,7 @@
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         "updated": "2020-02-02T01:23:45.678Z"
@@ -362,10 +362,10 @@
 },
 {
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+    "pk": "0813e0b8-64c7-409e-8223-a347ddf3c64a",
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-        "version": "d2534c7f-b6fa-4c99-90e4-6ee49c778d49",
+        "process": "d4cada0d-d5b3-48ed-bffc-db53c8cf5e75",
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@@ -378,10 +378,10 @@
 },
 {
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+    "pk": "5af05ed4-874c-43bc-85df-00544ea40fb7",
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-        "version": "c80c470f-856b-4ccc-ba1b-ed37744efc56",
+        "process": "0be71517-084c-435b-be54-8dba120c86fd",
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@@ -394,12 +394,12 @@
 },
 {
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-    "pk": "b369549d-05a3-4ac5-8ad6-abe3ce536565",
+    "pk": "83c242f7-03f3-4c33-962d-83147b7ddf63",
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-        "version": "3abbeb14-d57a-4aa9-bf02-b02c30b6a756",
+        "process": "d4cada0d-d5b3-48ed-bffc-db53c8cf5e75",
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-        "parents": "[\"0f7b4923-e9e8-4643-b210-918384353a4c\"]",
+        "parents": "[\"0813e0b8-64c7-409e-8223-a347ddf3c64a\"]",
         "configuration": null,
         "summary": "Worker Document layout analyser @ version 1",
         "created": "2020-02-02T01:23:45.678Z",
@@ -410,14 +410,14 @@
 },
 {
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-        "parents": "[\"b369549d-05a3-4ac5-8ad6-abe3ce536565\"]",
+        "parents": "[]",
         "configuration": null,
-        "summary": "Worker Recognizer @ version 1",
+        "summary": "Worker Custom worker @ version 1",
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
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@@ -426,14 +426,14 @@
 },
 {
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         "configuration": null,
-        "summary": "Worker Custom worker @ version 1",
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         "updated": "2020-02-02T01:23:45.678Z",
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@@ -442,7 +442,7 @@
 },
 {
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+    "pk": "12944eab-1b0e-4653-aa66-4c0231e722bf",
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@@ -455,11 +455,11 @@
 },
 {
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+    "pk": "2c577a34-0084-494c-9555-52bc5b74a89b",
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-        "slug": "act",
-        "display_name": "Act",
+        "corpus": "12944eab-1b0e-4653-aa66-4c0231e722bf",
+        "slug": "surface",
+        "display_name": "Surface",
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@@ -467,21 +467,21 @@
 },
 {
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+    "pk": "2d308dfa-ab53-4e37-b534-e5b1f9c48c83",
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-        "slug": "volume",
-        "display_name": "Volume",
-        "folder": true,
+        "corpus": "12944eab-1b0e-4653-aa66-4c0231e722bf",
+        "slug": "word",
+        "display_name": "Word",
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 },
 {
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@@ -491,23 +491,23 @@
 },
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-        "slug": "word",
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-        "folder": false,
+        "corpus": "12944eab-1b0e-4653-aa66-4c0231e722bf",
+        "slug": "volume",
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 {
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@@ -515,11 +515,11 @@
 },
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@@ -527,279 +527,279 @@
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@@ -807,18 +807,18 @@
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@@ -826,18 +826,18 @@
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@@ -845,18 +845,18 @@
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@@ -864,18 +864,18 @@
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@@ -883,18 +883,18 @@
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@@ -1339,104 +1339,104 @@
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         "worker_run": null
@@ -1596,9 +1596,9 @@
 },
 {
     "model": "documents.metadata",
-    "pk": "61f6a231-7990-42da-ae25-bfd7be6efb6d",
+    "pk": "879dded1-10be-43a7-9b25-d0b008792294",
     "fields": {
-        "element": "0c075318-7182-4426-9290-b55be576ec59",
+        "element": "6e739e39-da6a-4535-9160-23eab0604f83",
         "name": "folio",
         "type": "text",
         "value": "1v",
@@ -1609,12 +1609,12 @@
 },
 {
     "model": "documents.metadata",
-    "pk": "6cea22a1-b6de-4787-b9a6-90da820c93bc",
+    "pk": "98140d77-ba6b-4b2d-9c13-d7c8e2c9194a",
     "fields": {
-        "element": "3da1a67c-3401-4e42-9bb2-c67cac191de9",
-        "name": "number",
+        "element": "fc22eb47-6281-4a56-b474-b91993e9eead",
+        "name": "folio",
         "type": "text",
-        "value": "3",
+        "value": "1r",
         "entity": null,
         "worker_version": null,
         "worker_run": null
@@ -1622,12 +1622,12 @@
 },
 {
     "model": "documents.metadata",
-    "pk": "9c371c8a-2880-44f1-a996-ad69f83c371d",
+    "pk": "a31ae1f2-a1f3-4b2d-88ac-045361a21ff2",
     "fields": {
-        "element": "1aeeeb1a-dd31-4098-af23-c62571d8986b",
+        "element": "85bc5401-69a7-4d96-bea3-cc47bc6e651c",
         "name": "number",
         "type": "text",
-        "value": "5",
+        "value": "4",
         "entity": null,
         "worker_version": null,
         "worker_run": null
@@ -1635,12 +1635,12 @@
 },
 {
     "model": "documents.metadata",
-    "pk": "c95bd09c-624e-44fd-afa5-76b37bf7d3bb",
+    "pk": "c72ed6c2-24ee-4b50-951c-3a2f4714592e",
     "fields": {
-        "element": "983316a5-b031-4fa7-89fd-aae42417a9d8",
+        "element": "36f889af-a83b-47b7-ab80-fbf7bdd5c08d",
         "name": "number",
         "type": "text",
-        "value": "4",
+        "value": "2",
         "entity": null,
         "worker_version": null,
         "worker_run": null
@@ -1648,12 +1648,12 @@
 },
 {
     "model": "documents.metadata",
-    "pk": "d9c1d3ca-e908-47ea-b2b3-9999b09fee1c",
+    "pk": "d102c307-bd1a-492e-8dd4-d04d9bdbf439",
     "fields": {
-        "element": "690861ed-336b-425f-8553-600df019e9c4",
-        "name": "folio",
+        "element": "b728983a-ec3e-4f4d-b1ad-b71c31e39868",
+        "name": "number",
         "type": "text",
-        "value": "2r",
+        "value": "1",
         "entity": null,
         "worker_version": null,
         "worker_run": null
@@ -1661,12 +1661,12 @@
 },
 {
     "model": "documents.metadata",
-    "pk": "f5a5e2e5-60b4-4105-94d4-1c30d0c6b480",
+    "pk": "e41db6a4-1800-4848-b528-a747e0bcc66e",
     "fields": {
-        "element": "eba59781-a3e1-4c68-b144-69f75db971d3",
-        "name": "number",
+        "element": "57dc759a-b8be-4411-bfa3-cd884c24b37f",
+        "name": "folio",
         "type": "text",
-        "value": "1",
+        "value": "1r",
         "entity": null,
         "worker_version": null,
         "worker_run": null
@@ -1689,12 +1689,12 @@
 },
 {
     "model": "images.image",
-    "pk": "1f3ecb14-bb23-4e54-973f-050d2531d607",
+    "pk": "0775b12d-856e-417f-8ab2-b80dceb11e13",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "server": 1,
-        "path": "img3",
+        "path": "img4",
         "width": 1000,
         "height": 1000,
         "hash": null,
@@ -1703,12 +1703,12 @@
 },
 {
     "model": "images.image",
-    "pk": "403de131-d7fb-421e-9a4c-6601a6523f42",
+    "pk": "0a404dd6-7b53-4f10-ab8e-601ef5f22f97",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "server": 1,
-        "path": "img4",
+        "path": "img1",
         "width": 1000,
         "height": 1000,
         "hash": null,
@@ -1717,12 +1717,12 @@
 },
 {
     "model": "images.image",
-    "pk": "566dd35a-8f1e-4e43-9807-b346b9790127",
+    "pk": "30d880ab-43c1-4f62-955f-41bb2f1a0802",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "server": 1,
-        "path": "img6",
+        "path": "img3",
         "width": 1000,
         "height": 1000,
         "hash": null,
@@ -1731,7 +1731,7 @@
 },
 {
     "model": "images.image",
-    "pk": "b8c7f16a-47e8-4902-b386-8e810c62bcc9",
+    "pk": "8ec1120e-29b7-43cd-b298-1d3ec7144f4f",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
@@ -1745,12 +1745,12 @@
 },
 {
     "model": "images.image",
-    "pk": "c329f6cf-4eb2-4c58-b60f-c66567176e8d",
+    "pk": "a68a053f-ef37-4f96-bd06-08bb2f31a978",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "server": 1,
-        "path": "img2",
+        "path": "img6",
         "width": 1000,
         "height": 1000,
         "hash": null,
@@ -1759,12 +1759,12 @@
 },
 {
     "model": "images.image",
-    "pk": "ef7ee326-fcf0-4647-b482-ffafbffd354c",
+    "pk": "f2a146eb-9cab-4bfb-b97b-59b16137c200",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
         "server": 1,
-        "path": "img1",
+        "path": "img2",
         "width": 1000,
         "height": 1000,
         "hash": null,
@@ -1773,56 +1773,56 @@
 },
 {
     "model": "users.right",
-    "pk": "45f61da8-62be-435a-9f4d-99b374f7db5a",
+    "pk": "84d8e8fe-54dc-4fd8-9029-6c1a177bfafa",
     "fields": {
         "user": 2,
         "group": null,
-        "content_type": 34,
-        "content_id": "5f00641e-47a8-42f3-b488-51b766f9b7a3",
+        "content_type": 21,
+        "content_id": "12944eab-1b0e-4653-aa66-4c0231e722bf",
         "level": 100
     }
 },
 {
     "model": "users.right",
-    "pk": "5b2ff5ab-045b-450e-b282-aeb0d7a1c79d",
+    "pk": "c8f5b27a-a329-452f-80d4-4e3b06cd5aab",
     "fields": {
-        "user": 3,
+        "user": 4,
         "group": null,
         "content_type": 34,
-        "content_id": "5f00641e-47a8-42f3-b488-51b766f9b7a3",
-        "level": 50
+        "content_id": "9f46c025-7bfb-4322-b5bb-76fded823477",
+        "level": 10
     }
 },
 {
     "model": "users.right",
-    "pk": "893dd76e-24bc-4719-b0f2-7aeb96f7e3af",
+    "pk": "d9dd9193-316d-4a74-99a8-31ed99c7ef9d",
     "fields": {
-        "user": 4,
+        "user": 3,
         "group": null,
         "content_type": 34,
-        "content_id": "5f00641e-47a8-42f3-b488-51b766f9b7a3",
-        "level": 10
+        "content_id": "9f46c025-7bfb-4322-b5bb-76fded823477",
+        "level": 50
     }
 },
 {
     "model": "users.right",
-    "pk": "8c61605a-ebce-496b-86bf-b8c95e7c9b74",
+    "pk": "ebc94e97-90e8-4990-afbd-6bd9fdfe286a",
     "fields": {
         "user": 2,
         "group": null,
         "content_type": 13,
-        "content_id": "2ef1cf21-aef3-4aea-832f-f3b480ce3a61",
+        "content_id": "283c0517-96d3-4f61-8847-7245b131ad32",
         "level": 10
     }
 },
 {
     "model": "users.right",
-    "pk": "f41680b0-896d-42de-9430-b735433b2950",
+    "pk": "fd4b1f5f-03bf-4f08-84bc-acd5eb7da40e",
     "fields": {
         "user": 2,
         "group": null,
-        "content_type": 21,
-        "content_id": "044e41fa-d1d1-4a9e-a59b-02a78c681dae",
+        "content_type": 34,
+        "content_id": "9f46c025-7bfb-4322-b5bb-76fded823477",
         "level": 100
     }
 },
@@ -1830,7 +1830,7 @@
     "model": "users.user",
     "pk": 1,
     "fields": {
-        "password": "pbkdf2_sha256$600000$WjJ9ofomAouE1GDpXprfMT$WXG/rsOyU+Yl/oeIdHe1b06v/0L9TpTpdbB4p3tFBwg=",
+        "password": "pbkdf2_sha256$720000$86ridKIpMBH5NW2YIPeV87$cNItTxjDwpROD4YpvGIJ1v3KtDbuizX88BeAj6iS9X0=",
         "last_login": null,
         "email": "root@root.fr",
         "display_name": "Admin",
@@ -1845,7 +1845,7 @@
     "model": "users.user",
     "pk": 2,
     "fields": {
-        "password": "pbkdf2_sha256$600000$isDEKLFCkhVkUra1zR4wvU$KdrrV7ub+vl9nCSPwZpsQAeZsZCu3vjn4OJNtWyE/0s=",
+        "password": "pbkdf2_sha256$720000$rQFnfpWrnGXT4tUT6T2UF5$gmOmD5LFgYwELEKHmAT3BKTPvq7ssh+sSzGLZjMzsHc=",
         "last_login": null,
         "email": "user@user.fr",
         "display_name": "Test user",
@@ -1888,7 +1888,7 @@
 },
 {
     "model": "users.group",
-    "pk": "5f00641e-47a8-42f3-b488-51b766f9b7a3",
+    "pk": "9f46c025-7bfb-4322-b5bb-76fded823477",
     "fields": {
         "name": "User group",
         "public": false,
@@ -3850,19 +3850,19 @@
 },
 {
     "model": "ponos.farm",
-    "pk": "2ef1cf21-aef3-4aea-832f-f3b480ce3a61",
+    "pk": "283c0517-96d3-4f61-8847-7245b131ad32",
     "fields": {
         "name": "Wheat farm",
-        "seed": "ddf0a69d541942edb89376b20f16e12fbb08850059d44b3ecb57e69be66957e6"
+        "seed": "744e8c9a9b201cccdfdaf543db13c2775a9c3dd0d17fb4cf8ba19707a1bf3f14"
     }
 },
 {
     "model": "training.dataset",
-    "pk": "0758d75b-2214-4507-a097-6665c8880fb3",
+    "pk": "9894c9f7-be52-4cb7-8e3a-193a518184ee",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "corpus": "044e41fa-d1d1-4a9e-a59b-02a78c681dae",
+        "corpus": "12944eab-1b0e-4653-aa66-4c0231e722bf",
         "creator": 2,
         "task": null,
         "name": "Second Dataset",
@@ -3873,11 +3873,11 @@
 },
 {
     "model": "training.dataset",
-    "pk": "5a644df2-d88d-4cc5-8a58-58ec6166fa47",
+    "pk": "b9152505-b3e9-473a-b1c4-e277f564a6d9",
     "fields": {
         "created": "2020-02-02T01:23:45.678Z",
         "updated": "2020-02-02T01:23:45.678Z",
-        "corpus": "044e41fa-d1d1-4a9e-a59b-02a78c681dae",
+        "corpus": "12944eab-1b0e-4653-aa66-4c0231e722bf",
         "creator": 2,
         "task": null,
         "name": "First Dataset",
@@ -3888,50 +3888,50 @@
 },
 {
     "model": "training.datasetset",
-    "pk": "28cd6986-a8e5-4f19-9259-09bcecf69e0f",
+    "pk": "19cbad25-ec14-4ea4-adcb-8963c59d892a",
     "fields": {
-        "name": "test",
-        "dataset": "0758d75b-2214-4507-a097-6665c8880fb3"
+        "name": "train",
+        "dataset": "b9152505-b3e9-473a-b1c4-e277f564a6d9"
     }
 },
 {
     "model": "training.datasetset",
-    "pk": "3e70465b-d098-4168-85cb-2e4b052162b0",
+    "pk": "881a2377-9c28-48ac-a148-0f5926b88c25",
     "fields": {
-        "name": "dev",
-        "dataset": "0758d75b-2214-4507-a097-6665c8880fb3"
+        "name": "test",
+        "dataset": "9894c9f7-be52-4cb7-8e3a-193a518184ee"
     }
 },
 {
     "model": "training.datasetset",
-    "pk": "6e1d5dd1-3a30-4014-88d1-adf6c56996a0",
+    "pk": "9861921d-ea65-4ec9-9d2e-063187ef38e9",
     "fields": {
         "name": "dev",
-        "dataset": "5a644df2-d88d-4cc5-8a58-58ec6166fa47"
+        "dataset": "9894c9f7-be52-4cb7-8e3a-193a518184ee"
     }
 },
 {
     "model": "training.datasetset",
-    "pk": "7d2b5b13-5b00-4c7c-98a4-6e5d5c01b958",
+    "pk": "c62b45a1-864b-4be0-a642-0e36ae068edf",
     "fields": {
-        "name": "train",
-        "dataset": "5a644df2-d88d-4cc5-8a58-58ec6166fa47"
+        "name": "test",
+        "dataset": "b9152505-b3e9-473a-b1c4-e277f564a6d9"
     }
 },
 {
     "model": "training.datasetset",
-    "pk": "cd9b0ab6-e00a-4ee7-8133-7d9bc8881491",
+    "pk": "d8b49d2f-85d6-402f-a45c-7ce0977ca93c",
     "fields": {
-        "name": "test",
-        "dataset": "5a644df2-d88d-4cc5-8a58-58ec6166fa47"
+        "name": "dev",
+        "dataset": "b9152505-b3e9-473a-b1c4-e277f564a6d9"
     }
 },
 {
     "model": "training.datasetset",
-    "pk": "e2516b99-644f-4359-aaf8-59549e53eae7",
+    "pk": "f901c2a3-0520-4357-a1e9-9dd4926f9061",
     "fields": {
         "name": "train",
-        "dataset": "0758d75b-2214-4507-a097-6665c8880fb3"
+        "dataset": "9894c9f7-be52-4cb7-8e3a-193a518184ee"
     }
 }
 ]
diff --git a/arkindex/documents/management/commands/build_fixtures.py b/arkindex/documents/management/commands/build_fixtures.py
index a489d041ba000580168ddcb72797bb525364bf00..4d8c3a089a73d48198bd69d21e023cb4c9feab5b 100644
--- a/arkindex/documents/management/commands/build_fixtures.py
+++ b/arkindex/documents/management/commands/build_fixtures.py
@@ -362,6 +362,7 @@ class Command(BaseCommand):
                 element.add_parent(page)
                 element.transcriptions.create(
                     worker_run=reco_run,
+                    worker_version=recognizer_worker,
                     text=word,
                     confidence=1.0,
                 )
@@ -369,6 +370,7 @@ class Command(BaseCommand):
         # Create a page transcription on page 1
         p1_1.transcriptions.create(
             worker_run=reco_run,
+            worker_version=recognizer_worker,
             text="Lorem ipsum dolor sit amet",
             confidence=1.0,
         )
diff --git a/arkindex/documents/management/commands/load_export.py b/arkindex/documents/management/commands/load_export.py
index 5b2fc0538f7d78713dc37de44c2746948a2b2ebc..55ec306ee4752ba525ca7c99e850a55e76aff2ce 100644
--- a/arkindex/documents/management/commands/load_export.py
+++ b/arkindex/documents/management/commands/load_export.py
@@ -107,7 +107,6 @@ SQL_ELEMENT_QUERY = """
         polygon,
         rotation_angle,
         mirrored,
-        worker_version_id,
         worker_run_id,
         confidence
     FROM element
@@ -202,7 +201,7 @@ class Command(BaseCommand):
             image_id=row["image_id"],
             rotation_angle=row["rotation_angle"],
             mirrored=row["mirrored"],
-            worker_version_id=self.worker_version_map[row["worker_version_id"]] if row["worker_version_id"] else None,
+            worker_version_id=self.worker_run_version_map[row["worker_run_id"]] if row["worker_run_id"] else None,
             worker_run_id=self.worker_run_map[row["worker_run_id"]] if row["worker_run_id"] else None,
             confidence=row["confidence"],
             corpus=self.corpus
@@ -231,7 +230,7 @@ class Command(BaseCommand):
             validated=row["validated"],
             moderator=User.objects.get(email=row["moderator"]) if row["moderator"] else None,
             metas=json.loads(row["metas"]) if row["metas"] else None,
-            worker_version_id=self.worker_version_map[row["worker_version_id"]] if row["worker_version_id"] else None,
+            worker_version_id=self.worker_run_version_map[row["worker_run_id"]] if row["worker_run_id"] else None,
             worker_run_id=self.worker_run_map[row["worker_run_id"]] if row["worker_run_id"] else None,
             corpus=self.corpus
         )]
@@ -251,7 +250,7 @@ class Command(BaseCommand):
             text=row["text"],
             confidence=row["confidence"],
             orientation=row["orientation"],
-            worker_version_id=self.worker_version_map[row["worker_version_id"]] if row["worker_version_id"] else None,
+            worker_version_id=self.worker_run_version_map[row["worker_run_id"]] if row["worker_run_id"] else None,
             worker_run_id=self.worker_run_map[row["worker_run_id"]] if row["worker_run_id"] else None,
         )]
 
@@ -262,7 +261,7 @@ class Command(BaseCommand):
             entity_id=row["entity_id"],
             offset=row["offset"],
             length=row["length"],
-            worker_version_id=self.worker_version_map[row["worker_version_id"]] if row["worker_version_id"] else None,
+            worker_version_id=self.worker_run_version_map[row["worker_run_id"]] if row["worker_run_id"] else None,
             worker_run_id=self.worker_run_map[row["worker_run_id"]] if row["worker_run_id"] else None,
             confidence=row["confidence"],
         )]
@@ -275,7 +274,7 @@ class Command(BaseCommand):
             type=row["type"],
             value=row["value"],
             entity_id=row["entity_id"],
-            worker_version_id=self.worker_version_map[row["worker_version_id"]] if row["worker_version_id"] else None,
+            worker_version_id=self.worker_run_version_map[row["worker_run_id"]] if row["worker_run_id"] else None,
             worker_run_id=self.worker_run_map[row["worker_run_id"]] if row["worker_run_id"] else None,
         )]
 
@@ -288,7 +287,7 @@ class Command(BaseCommand):
             moderator=User.objects.get(email=row["moderator"]) if row["moderator"] else None,
             confidence=row["confidence"],
             high_confidence=row["high_confidence"],
-            worker_version_id=self.worker_version_map[row["worker_version_id"]] if row["worker_version_id"] else None,
+            worker_version_id=self.worker_run_version_map[row["worker_run_id"]] if row["worker_run_id"] else None,
             worker_run_id=self.worker_run_map[row["worker_run_id"]] if row["worker_run_id"] else None,
         )]
 
@@ -442,6 +441,8 @@ class Command(BaseCommand):
 
     def create_worker_run(self, row):
         worker_version_id = self.worker_version_map[row["worker_version_id"]]
+        self.worker_run_version_map[row["id"]] = worker_version_id
+
         model_version, configuration = None, None
 
         if row["model_version_id"]:
@@ -565,6 +566,9 @@ class Command(BaseCommand):
             self.worker_type_map = self.create_objects(WorkerType, self.create_worker_type, SQL_WORKER_TYPE_QUERY)
             self.worker_map = self.create_objects(Worker, self.create_worker, SQL_WORKER_VERSION_QUERY)
             self.worker_version_map = self.create_objects(WorkerVersion, self.create_worker_version, SQL_WORKER_VERSION_QUERY)
+            # Maps SQLite worker run IDs to Postgres worker version IDs.
+            # This is filled by create_worker_run and is used to add the deprecated worker version IDs on ML results.
+            self.worker_run_version_map = {}
             self.worker_run_map = self.create_objects(WorkerRun, self.create_worker_run, SQL_WORKER_RUN_QUERY)
 
             # Create images and servers
diff --git a/arkindex/documents/tests/commands/test_load_export.py b/arkindex/documents/tests/commands/test_load_export.py
index cfb8a2b546f20a2a746347601f3bd0d17b9e3007..f1fca7354850915d69a84adf1d68c36b4b619a8b 100644
--- a/arkindex/documents/tests/commands/test_load_export.py
+++ b/arkindex/documents/tests/commands/test_load_export.py
@@ -181,6 +181,7 @@ class TestLoadExport(FixtureTestCase):
             offset=0,
             length=1,
             worker_version=reco_version,
+            worker_run=reco_run,
             confidence=0.42,
         )
 
diff --git a/arkindex/documents/tests/tasks/test_export.py b/arkindex/documents/tests/tasks/test_export.py
index 65e3f8d72cd71b1accf8babf57106816adb47124..9831b8eed4f1f7e73a91d17e3bbb45d855255a97 100644
--- a/arkindex/documents/tests/tasks/test_export.py
+++ b/arkindex/documents/tests/tasks/test_export.py
@@ -23,7 +23,7 @@ from arkindex.documents.models import (
 from arkindex.images.models import Image, ImageServer
 from arkindex.process.models import Worker, WorkerType, WorkerVersion, WorkerVersionState
 from arkindex.project.tests import FixtureTestCase
-from arkindex.training.models import DatasetElement
+from arkindex.training.models import DatasetElement, Model, ModelVersion
 
 TABLE_NAMES = {
     "export_version",
@@ -73,13 +73,23 @@ class TestExport(FixtureTestCase):
         element.save()
         transcription = Transcription.objects.first()
         version = WorkerVersion.objects.get(worker__slug="reco")
+        run = version.worker_runs.first()
 
         metadata_version = self._make_worker_version()
+        metadata_run = run.process.worker_runs.create(
+            version=metadata_version,
+            model_version=ModelVersion.objects.create(
+                model=Model.objects.create(name="Some model"),
+            ),
+            configuration=metadata_version.worker.configurations.create(name="Some configuration"),
+        )
+
         element.metadatas.create(
             type=MetaType.Numeric,
             name="Score",
             value=1,
             worker_version=metadata_version,
+            worker_run=metadata_run,
         )
 
         element.classifications.create(
@@ -107,6 +117,7 @@ class TestExport(FixtureTestCase):
             offset=1,
             length=1,
             worker_version=version,
+            worker_run=run,
         )
 
         transcription.transcription_entities.create(
@@ -114,6 +125,7 @@ class TestExport(FixtureTestCase):
             offset=0,
             length=1,
             worker_version=version,
+            worker_run=run,
             confidence=0.42,
         )
 
@@ -208,6 +220,28 @@ class TestExport(FixtureTestCase):
             ]
         )
 
+        self.assertCountEqual(
+            db.execute("SELECT id, worker_version_id, model_version_id, model_id, model_name, configuration_id FROM worker_run").fetchall(),
+            [
+                (
+                    str(run.id),
+                    str(version.id),
+                    None,
+                    None,
+                    None,
+                    None,
+                ),
+                (
+                    str(metadata_run.id),
+                    str(metadata_version.id),
+                    str(metadata_run.model_version_id),
+                    str(metadata_run.model_version.model_id),
+                    str(metadata_run.model_version.model.name),
+                    str(metadata_run.configuration_id),
+                ),
+            ]
+        )
+
         actual_rows = db.execute("""
             SELECT
                 id,
@@ -218,7 +252,6 @@ class TestExport(FixtureTestCase):
                 rotation_angle,
                 mirrored,
                 confidence,
-                worker_version_id,
                 worker_run_id,
                 image_id,
                 polygon
@@ -246,11 +279,6 @@ class TestExport(FixtureTestCase):
                 element.confidence
             ]
 
-            if element.worker_version_id:
-                row.append(str(element.worker_version_id))
-            else:
-                row.append(None)
-
             if element.worker_run_id:
                 row.append(str(element.worker_run_id))
             else:
@@ -293,7 +321,6 @@ class TestExport(FixtureTestCase):
                     text,
                     confidence,
                     orientation,
-                    worker_version_id,
                     worker_run_id
                 FROM transcription
             """).fetchall(),
@@ -304,7 +331,6 @@ class TestExport(FixtureTestCase):
                     transcription.text,
                     transcription.confidence,
                     transcription.orientation.value,
-                    str(transcription.worker_version_id) if transcription.worker_version_id else None,
                     str(transcription.worker_run_id) if transcription.worker_run_id else None,
                 )
                 for transcription in Transcription.objects.filter(element__corpus=self.corpus)
@@ -321,7 +347,6 @@ class TestExport(FixtureTestCase):
                     moderator,
                     confidence,
                     high_confidence,
-                    worker_version_id,
                     worker_run_id
                 FROM classification
             """).fetchall(),
@@ -334,7 +359,6 @@ class TestExport(FixtureTestCase):
                     classification.moderator.email if classification.moderator else None,
                     classification.confidence,
                     int(classification.high_confidence),
-                    str(classification.worker_version_id) if classification.worker_version_id else None,
                     str(classification.worker_run_id) if classification.worker_run_id else None,
                 )
                 for classification in Classification.objects.filter(element__corpus=self.corpus)
@@ -350,7 +374,6 @@ class TestExport(FixtureTestCase):
                     type,
                     value,
                     entity_id,
-                    worker_version_id,
                     worker_run_id
                 FROM metadata
             """).fetchall(),
@@ -362,7 +385,6 @@ class TestExport(FixtureTestCase):
                     metadata.type.value,
                     metadata.value,
                     str(metadata.entity_id) if metadata.entity_id else None,
-                    str(metadata.worker_version_id) if metadata.worker_version_id else None,
                     str(metadata.worker_run_id) if metadata.worker_run_id else None,
                 )
                 for metadata in MetaData.objects.filter(element__corpus=self.corpus)
@@ -378,7 +400,6 @@ class TestExport(FixtureTestCase):
                     validated,
                     moderator,
                     metas,
-                    worker_version_id,
                     worker_run_id
                 FROM entity
             """).fetchall(),
@@ -390,7 +411,6 @@ class TestExport(FixtureTestCase):
                     int(entity.validated),
                     entity.moderator.email if entity.moderator else None,
                     json.dumps(entity.metas) if entity.metas else None,
-                    str(entity.worker_version_id) if entity.worker_version_id else None,
                     str(entity.worker_run_id) if entity.worker_run_id else None,
                 )
                 for entity in self.corpus.entities.all()
@@ -416,7 +436,6 @@ class TestExport(FixtureTestCase):
                     entity_id,
                     offset,
                     length,
-                    worker_version_id,
                     worker_run_id,
                     confidence
                 FROM transcription_entity
@@ -427,7 +446,6 @@ class TestExport(FixtureTestCase):
                     str(transcription_entity.entity_id),
                     transcription_entity.offset,
                     transcription_entity.length,
-                    str(transcription_entity.worker_version_id) if transcription_entity.worker_version_id else None,
                     str(transcription_entity.worker_run_id) if transcription_entity.worker_run_id else None,
                     transcription_entity.confidence,
                 )
diff --git a/arkindex/documents/tests/test_children_elements.py b/arkindex/documents/tests/test_children_elements.py
index 1eeb278e71b8e8e91e13cc74bc0f9641c070bb37..66eb2dbc47611d6e423f9a4e541d32d22a19b100 100644
--- a/arkindex/documents/tests/test_children_elements.py
+++ b/arkindex/documents/tests/test_children_elements.py
@@ -317,7 +317,7 @@ class TestChildrenElements(FixtureAPITestCase):
         )
 
     def test_element_children_worker_version_filter(self):
-        self.corpus.elements.filter(name__contains="page 1r").update(worker_version=self.worker_version)
+        self.corpus.elements.filter(name__contains="page 1r").update(worker_version=self.worker_version, worker_run=self.worker_run)
 
         with self.assertNumQueries(6):
             response = self.client.get(
@@ -1074,8 +1074,8 @@ class TestChildrenElements(FixtureAPITestCase):
 
     def test_transcription_worker_version_filter(self):
         recognizer = WorkerVersion.objects.get(worker__slug="reco")
-        Transcription.objects.filter(text="PARIS").update(worker_version=None)
-        Transcription.objects.filter(text="ROY").update(worker_version=self.worker_version)
+        Transcription.objects.filter(text="PARIS").update(worker_version=None, worker_run=None)
+        Transcription.objects.filter(text="ROY").update(worker_version=self.worker_version, worker_run=self.worker_run)
 
         cases = [
             (str(recognizer.id), ["Volume 1, page 1r", "DATUM", "DATUM", "DATUM"]),
@@ -1095,7 +1095,7 @@ class TestChildrenElements(FixtureAPITestCase):
                 )
 
     def test_transcription_worker_run_filter(self):
-        Transcription.objects.filter(text="PARIS").update(worker_run=None)
+        Transcription.objects.exclude(text="ROY").update(worker_run=None)
         Transcription.objects.filter(text="ROY").update(worker_run=self.worker_run)
 
         cases = [
diff --git a/arkindex/documents/tests/test_corpus_elements.py b/arkindex/documents/tests/test_corpus_elements.py
index 20039f678adbd7ce25f6d5596d54514bb7d0faf4..5d5cc86e3b13785d9bffc6674cdeaff6bcf033b7 100644
--- a/arkindex/documents/tests/test_corpus_elements.py
+++ b/arkindex/documents/tests/test_corpus_elements.py
@@ -17,6 +17,7 @@ class TestListElements(FixtureAPITestCase):
     def setUpTestData(cls):
         super().setUpTestData()
         cls.worker_version = WorkerVersion.objects.get(worker__slug="reco")
+        cls.worker_run = cls.worker_version.worker_runs.first()
 
     def _get_prefetch_data(self, query):
         """
@@ -348,8 +349,8 @@ class TestListElements(FixtureAPITestCase):
         )
 
     def test_list_elements_filter_no_worker_version(self):
-        self.corpus.elements.update(worker_version=self.worker_version)
-        self.corpus.elements.filter(name__contains="Volume 2").update(worker_version=None)
+        self.corpus.elements.update(worker_version=self.worker_version, worker_run=self.worker_run)
+        self.corpus.elements.filter(name__contains="Volume 2").update(worker_version=None, worker_run=None)
 
         with self.assertNumQueries(5):
             response = self.client.get(
@@ -374,7 +375,7 @@ class TestListElements(FixtureAPITestCase):
         )
 
     def test_list_elements_filter_worker_version(self):
-        self.corpus.elements.filter(name__contains="Volume 2").update(worker_version=self.worker_version)
+        self.corpus.elements.filter(name__contains="Volume 2").update(worker_version=self.worker_version, worker_run=self.worker_run)
 
         with self.assertNumQueries(6):
             response = self.client.get(
@@ -939,8 +940,8 @@ class TestListElements(FixtureAPITestCase):
 
     def test_transcription_worker_version_filter(self):
         dla = WorkerVersion.objects.get(worker__slug="dla")
-        Transcription.objects.filter(text="PARIS").update(worker_version=None)
-        Transcription.objects.filter(text="ROY").update(worker_version=dla)
+        Transcription.objects.filter(text="PARIS").update(worker_version=None, worker_run=None)
+        Transcription.objects.filter(text="ROY").update(worker_version=dla, worker_run=dla.worker_runs.first())
 
         cases = [
             (str(self.worker_version.id), ["DATUM", "DATUM", "DATUM", "Volume 1, page 1r"]),
diff --git a/arkindex/documents/tests/test_edit_transcriptions.py b/arkindex/documents/tests/test_edit_transcriptions.py
index a302bb452db99f9f465a4bf158a2365b6c475ef3..92093e9a04dcfc026cbdc6c3bc93840b0db30185 100644
--- a/arkindex/documents/tests/test_edit_transcriptions.py
+++ b/arkindex/documents/tests/test_edit_transcriptions.py
@@ -21,7 +21,7 @@ class TestEditTranscription(FixtureAPITestCase):
         element = Element.objects.get_descending(page.id).filter(type__slug="word", name="PARIS").get()
         cls.line = cls.corpus.elements.filter(type__slug="text_line").first()
         cls.ml_transcription = element.transcriptions.get(text="PARIS")
-        cls.worker_version = cls.ml_transcription.worker_version
+        cls.worker_run = cls.ml_transcription.worker_run
         private_corpus = Corpus.objects.create(name="Private")
         cls.private_page = private_corpus.elements.create(type=page.type)
         location_type = EntityType.objects.get(name="location", corpus=cls.corpus)
@@ -59,7 +59,7 @@ class TestEditTranscription(FixtureAPITestCase):
             "worker_run": None,
         })
 
-    def test_get_worker_version(self):
+    def test_get_worker_run(self):
         """
         Retrieve a transcription produced by a ML worker
         """
@@ -71,7 +71,10 @@ class TestEditTranscription(FixtureAPITestCase):
             "confidence": 1.0,
             "text": "PARIS",
             "orientation": TextOrientation.HorizontalLeftToRight.value,
-            "worker_run": None,
+            "worker_run": {
+                "id": str(self.worker_run.id),
+                "summary": "Worker Recognizer @ version 1",
+            },
         })
 
     def test_get_verified_user(self):
diff --git a/arkindex/documents/tests/test_transcriptions.py b/arkindex/documents/tests/test_transcriptions.py
index c2fee40d7c730fb668a266a79508f6cfccf43177..f5f59dff0e205ffa76f4e93d6b2fc4bf542f3cba 100644
--- a/arkindex/documents/tests/test_transcriptions.py
+++ b/arkindex/documents/tests/test_transcriptions.py
@@ -61,7 +61,10 @@ class TestTranscriptions(FixtureAPITestCase):
                 "confidence": 1.0,
                 "orientation": TextOrientation.HorizontalLeftToRight.value,
                 "element": None,
-                "worker_run": None,
+                "worker_run": {
+                    "id": str(self.worker_run.id),
+                    "summary": "Worker Recognizer @ version 1",
+                },
             },
             {
                 "id": str(tr2.id),
@@ -249,53 +252,33 @@ class TestTranscriptions(FixtureAPITestCase):
         ])
 
     def test_list_worker_run_transcriptions(self):
-        worker_transcription = self.page.transcriptions.create(
-            text="something",
-            worker_version=self.worker_version_2,
-            worker_run=self.worker_run,
-            confidence=0.369,
-        )
+        worker_transcription = self.page.transcriptions.get(worker_run=self.worker_run)
 
         self.client.force_login(self.user)
 
         with self.assertNumQueries(5):
             response = self.client.get(
                 reverse("api:element-transcriptions", kwargs={"pk": str(self.page.id)}),
-                data={"recursive": "true", "worker_run": str(self.worker_run.id)}
+                data={"worker_run": str(self.worker_run.id)}
             )
             self.assertEqual(response.status_code, status.HTTP_200_OK)
 
         self.assertListEqual(response.json()["results"], [
             {
                 "id": str(worker_transcription.id),
-                "text": "something",
-                "confidence": 0.369,
+                "text": "Lorem ipsum dolor sit amet",
+                "confidence": 1.0,
                 "orientation": TextOrientation.HorizontalLeftToRight.value,
-                "element": {
-                    "id": str(self.page.id),
-                    "name": "Volume 1, page 1r",
-                    "type": "page",
-                    "zone": {
-                        "id": str(self.page.id),
-                        "polygon": [[0, 0], [0, 1000], [1000, 1000], [1000, 0], [0, 0]],
-                    },
-                    "rotation_angle": 0,
-                    "mirrored": False
-                },
+                "element": None,
                 "worker_run": {
                     "id": str(self.worker_run.id),
-                    "summary": self.worker_run.summary
+                    "summary": "Worker Recognizer @ version 1",
                 },
             }
         ])
 
     def test_list_worker_run_and_wrong_version(self):
-        self.page.transcriptions.create(
-            text="something",
-            worker_version=self.worker_version_2,
-            worker_run=self.worker_run,
-            confidence=0.369,
-        )
+        self.worker_version_1.transcriptions.update(worker_version=self.worker_version_2)
 
         self.client.force_login(self.user)