Add 'index in job' number to tasks

Number the tasks in a job, indicating their creation order. This gives the
web interface something to sort on that doesn't change on task updates.

CHANGELOG.md

@@ -8,6 +8,7 @@ bugs in actually-released versions.
 
 - Change the name of the add-on from "Flamenco 3" to just "Flamenco".
 - Add `label` to job settings, to have full control over how they are presented in Blender's job submission GUI. If a job setting does not define a label, its `key` is used to generate one (like Flamenco 3.5 and older).
+- Number the tasks in a job, indicating their creation order. This gives the web interface something to sort on that doesn't change on task updates.
 - Add `shellSplit(someString)` function to the job compiler scripts. This splits a string into an array of strings using shell/CLI semantics.
 - Make it possible to script job submissions in Blender, by executing the `bpy.ops.flamenco.submit_job(job_name="jobname")` operator.
 - Security updates of some deendencies:

internal/manager/api_impl/jobs.go

@@ -708,7 +708,8 @@ func taskDBtoAPI(dbTask *persistence.Task) api.Task {
 		// TODO: convert this to just store dbTask.WorkerUUID.
 		Worker: workerToTaskWorker(dbTask.Worker),
 
-		JobId: dbTask.JobUUID,
+		JobId:      dbTask.JobUUID,
+		IndexInJob: dbTask.IndexInJob,
 	}
 
 	if dbTask.Job != nil {

internal/manager/api_impl/jobs_query.go

@@ -154,11 +154,12 @@ func (f *Flamenco) FetchTask(e echo.Context, taskID string) error {
 
 func taskDBtoSummary(task *persistence.Task) api.TaskSummary {
 	return api.TaskSummary{
-		Id:       task.UUID,
+		Id:         task.UUID,
-		Name:     task.Name,
+		Name:       task.Name,
-		Priority: task.Priority,
+		IndexInJob: task.IndexInJob,
-		Status:   task.Status,
+		Priority:   task.Priority,
-		TaskType: task.Type,
+		Status:     task.Status,
-		Updated:  task.UpdatedAt,
+		TaskType:   task.Type,
+		Updated:    task.UpdatedAt,
 	}
 }

internal/manager/persistence/jobs.go

@@ -60,13 +60,14 @@ type Task struct {
 	Model
 	UUID string
 
-	Name     string
+	Name       string
-	Type     string
+	Type       string
-	JobID    uint
+	JobID      uint
-	Job      *Job
+	Job        *Job
-	JobUUID  string // Fetched by SQLC, handled by GORM in Task.AfterFind()
+	JobUUID    string // Fetched by SQLC, handled by GORM in Task.AfterFind()
-	Priority int
+	IndexInJob int
-	Status   api.TaskStatus
+	Priority   int
+	Status     api.TaskStatus
 
 	// Which worker is/was working on this.
 	WorkerID      *uint
@@ -237,7 +238,7 @@ func (db *DB) storeAuthoredJobTaks(
 	now := db.now()
 
 	uuidToTask := make(map[string]TaskInfo)
-	for _, authoredTask := range authoredJob.Tasks {
+	for taskIndex, authoredTask := range authoredJob.Tasks {
 		// Marshal commands to JSON.
 		var commands []Command
 		for _, authoredCommand := range authoredTask.Commands {
@@ -253,14 +254,15 @@ func (db *DB) storeAuthoredJobTaks(
 		}
 
 		taskParams := sqlc.CreateTaskParams{
-			CreatedAt: now,
+			CreatedAt:  now,
-			Name:      authoredTask.Name,
+			Name:       authoredTask.Name,
-			Type:      authoredTask.Type,
+			Type:       authoredTask.Type,
-			UUID:      authoredTask.UUID,
+			UUID:       authoredTask.UUID,
-			JobID:     jobID,
+			JobID:      jobID,
-			Priority:  int64(authoredTask.Priority),
+			IndexInJob: int64(taskIndex + 1), // indexInJob is base-1.
-			Status:    string(api.TaskStatusQueued),
+			Priority:   int64(authoredTask.Priority),
-			Commands:  commandsJSON,
+			Status:     string(api.TaskStatusQueued),
+			Commands:   commandsJSON,
 			// dependencies are stored below.
 		}
 
@@ -1098,6 +1100,7 @@ func convertSqlcTask(task sqlc.Task, jobUUID string, workerUUID string) (*Task,
 		UUID:          task.UUID,
 		Name:          task.Name,
 		Type:          task.Type,
+		IndexInJob:    int(task.IndexInJob),
 		Priority:      int(task.Priority),
 		Status:        api.TaskStatus(task.Status),
 		LastTouchedAt: task.LastTouchedAt.Time,

internal/manager/persistence/jobs_query.go

@@ -29,12 +29,13 @@ func (db *DB) QueryJobTaskSummaries(ctx context.Context, jobUUID string) ([]*Tas
 				UpdatedAt: task.UpdatedAt.Time,
 			},
 
-			UUID:     task.UUID,
+			UUID:       task.UUID,
-			Name:     task.Name,
+			Name:       task.Name,
-			Type:     task.Type,
+			Type:       task.Type,
-			Priority: int(task.Priority),
+			IndexInJob: int(task.IndexInJob),
-			Status:   api.TaskStatus(task.Status),
+			Priority:   int(task.Priority),
-			JobUUID:  jobUUID,
+			Status:     api.TaskStatus(task.Status),
+			JobUUID:    jobUUID,
 		}
 		gormTasks[index] = &gormTask
 	}

internal/manager/persistence/jobs_query_test.go

@@ -47,8 +47,9 @@ func TestQueryJobTaskSummaries(t *testing.T) {
 	require.NoError(t, err)
 
 	assert.Len(t, summaries, len(expectTaskUUIDs))
-	for _, summary := range summaries {
+	for index, summary := range summaries {
 		assert.True(t, expectTaskUUIDs[summary.UUID], "%q should be in %v", summary.UUID, expectTaskUUIDs)
+		assert.Equal(t, index+1, summary.IndexInJob)
 	}
 }
 

internal/manager/persistence/migrations/0007_task_sequence.sql

@@ -0,0 +1,82 @@
+-- Add sequence numbers to tasks, to indicate their creation order within their job.
+--
+-- +goose Up
+
+CREATE TABLE temp_tasks (
+  id integer NOT NULL,
+  created_at datetime NOT NULL,
+  updated_at datetime,
+  uuid varchar(36) UNIQUE DEFAULT '' NOT NULL,
+  name varchar(64) DEFAULT '' NOT NULL,
+  type varchar(32) DEFAULT '' NOT NULL,
+  job_id integer DEFAULT 0 NOT NULL,
+  index_in_job integer DEFAULT 0 NOT NULL,
+  priority smallint DEFAULT 50 NOT NULL,
+  status varchar(16) DEFAULT '' NOT NULL,
+  worker_id integer,
+  last_touched_at datetime,
+  commands jsonb NOT NULL,
+  activity varchar(255) DEFAULT '' NOT NULL,
+  PRIMARY KEY (id),
+  UNIQUE(job_id, index_in_job),
+  CONSTRAINT fk_tasks_job FOREIGN KEY (job_id) REFERENCES jobs(id) ON DELETE CASCADE,
+  CONSTRAINT fk_tasks_worker FOREIGN KEY (worker_id) REFERENCES workers(id) ON DELETE SET NULL
+);
+INSERT INTO temp_tasks SELECT
+  id,
+  created_at,
+  updated_at,
+  uuid,
+  name,
+  type,
+  job_id,
+  ROW_NUMBER() OVER (
+    PARTITION BY job_id
+    ORDER BY rowid
+  ),
+  priority,
+  status,
+  worker_id,
+  last_touched_at,
+  commands,
+  activity
+FROM tasks;
+DROP TABLE tasks;
+ALTER TABLE temp_tasks RENAME TO tasks;
+
+-- +goose Down
+CREATE TABLE temp_tasks (
+  id integer NOT NULL,
+  created_at datetime NOT NULL,
+  updated_at datetime,
+  uuid varchar(36) UNIQUE DEFAULT '' NOT NULL,
+  name varchar(64) DEFAULT '' NOT NULL,
+  type varchar(32) DEFAULT '' NOT NULL,
+  job_id integer DEFAULT 0 NOT NULL,
+  priority smallint DEFAULT 50 NOT NULL,
+  status varchar(16) DEFAULT '' NOT NULL,
+  worker_id integer,
+  last_touched_at datetime,
+  commands jsonb NOT NULL,
+  activity varchar(255) DEFAULT '' NOT NULL,
+  PRIMARY KEY (id),
+  CONSTRAINT fk_tasks_job FOREIGN KEY (job_id) REFERENCES jobs(id) ON DELETE CASCADE,
+  CONSTRAINT fk_tasks_worker FOREIGN KEY (worker_id) REFERENCES workers(id) ON DELETE SET NULL
+);
+INSERT INTO temp_tasks SELECT
+  id,
+  created_at,
+  updated_at,
+  uuid,
+  name,
+  type,
+  job_id,
+  priority,
+  status,
+  worker_id,
+  last_touched_at,
+  commands,
+  activity
+FROM tasks;
+DROP TABLE tasks;
+ALTER TABLE temp_tasks RENAME TO tasks;

internal/manager/persistence/sqlc/models.go

@@ -62,6 +62,7 @@ type Task struct {
 	Name          string
 	Type          string
 	JobID         int64
+	IndexInJob    int64
 	Priority      int64
 	Status        string
 	WorkerID      sql.NullInt64

internal/manager/persistence/sqlc/query_jobs.sql

@@ -37,6 +37,7 @@ INSERT INTO tasks (
   name,
   type,
   job_id,
+  index_in_job,
   priority,
   status,
   commands
@@ -47,6 +48,7 @@ INSERT INTO tasks (
   @name,
   @type,
   @job_id,
+  @index_in_job,
   @priority,
   @status,
   @commands
@@ -313,7 +315,7 @@ AND T.type = @task_type;
 
 
 -- name: QueryJobTaskSummaries :many
-SELECT tasks.id, tasks.uuid, tasks.name, tasks.priority, tasks.status, tasks.type, tasks.updated_at
+SELECT tasks.id, tasks.uuid, tasks.name, tasks.index_in_job, tasks.priority, tasks.status, tasks.type, tasks.updated_at
 FROM tasks
 LEFT JOIN jobs ON jobs.id = tasks.job_id
 WHERE jobs.uuid=@job_uuid;

internal/manager/persistence/sqlc/query_jobs.sql.go

@@ -192,6 +192,7 @@ INSERT INTO tasks (
   name,
   type,
   job_id,
+  index_in_job,
   priority,
   status,
   commands
@@ -204,19 +205,21 @@ INSERT INTO tasks (
   ?5,
   ?6,
   ?7,
-  ?8
+  ?8,
+  ?9
 )
 `
 
 type CreateTaskParams struct {
-	CreatedAt time.Time
+	CreatedAt  time.Time
-	UUID      string
+	UUID       string
-	Name      string
+	Name       string
-	Type      string
+	Type       string
-	JobID     int64
+	JobID      int64
-	Priority  int64
+	IndexInJob int64
-	Status    string
+	Priority   int64
-	Commands  json.RawMessage
+	Status     string
+	Commands   json.RawMessage
 }
 
 func (q *Queries) CreateTask(ctx context.Context, arg CreateTaskParams) (int64, error) {
@@ -226,6 +229,7 @@ func (q *Queries) CreateTask(ctx context.Context, arg CreateTaskParams) (int64,
 		arg.Name,
 		arg.Type,
 		arg.JobID,
+		arg.IndexInJob,
 		arg.Priority,
 		arg.Status,
 		arg.Commands,
@@ -523,7 +527,7 @@ func (q *Queries) FetchJobsInStatus(ctx context.Context, statuses []string) ([]J
 }
 
 const fetchTask = `-- name: FetchTask :one
-SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity, jobs.UUID as jobUUID, workers.UUID as workerUUID
+SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.index_in_job, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity, jobs.UUID as jobUUID, workers.UUID as workerUUID
 FROM tasks
 LEFT JOIN jobs ON (tasks.job_id = jobs.id)
 LEFT JOIN workers ON (tasks.worker_id = workers.id)
@@ -547,6 +551,7 @@ func (q *Queries) FetchTask(ctx context.Context, uuid string) (FetchTaskRow, err
 		&i.Task.Name,
 		&i.Task.Type,
 		&i.Task.JobID,
+		&i.Task.IndexInJob,
 		&i.Task.Priority,
 		&i.Task.Status,
 		&i.Task.WorkerID,
@@ -624,7 +629,7 @@ func (q *Queries) FetchTaskJobUUID(ctx context.Context, uuid string) (sql.NullSt
 }
 
 const fetchTasksOfJob = `-- name: FetchTasksOfJob :many
-SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity, workers.UUID as workerUUID
+SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.index_in_job, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity, workers.UUID as workerUUID
 FROM tasks
 LEFT JOIN workers ON (tasks.worker_id = workers.id)
 WHERE tasks.job_id = ?1
@@ -652,6 +657,7 @@ func (q *Queries) FetchTasksOfJob(ctx context.Context, jobID int64) ([]FetchTask
 			&i.Task.Name,
 			&i.Task.Type,
 			&i.Task.JobID,
+			&i.Task.IndexInJob,
 			&i.Task.Priority,
 			&i.Task.Status,
 			&i.Task.WorkerID,
@@ -674,7 +680,7 @@ func (q *Queries) FetchTasksOfJob(ctx context.Context, jobID int64) ([]FetchTask
 }
 
 const fetchTasksOfJobInStatus = `-- name: FetchTasksOfJobInStatus :many
-SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity, workers.UUID as workerUUID
+SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.index_in_job, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity, workers.UUID as workerUUID
 FROM tasks
 LEFT JOIN workers ON (tasks.worker_id = workers.id)
 WHERE tasks.job_id = ?1
@@ -719,6 +725,7 @@ func (q *Queries) FetchTasksOfJobInStatus(ctx context.Context, arg FetchTasksOfJ
 			&i.Task.Name,
 			&i.Task.Type,
 			&i.Task.JobID,
+			&i.Task.IndexInJob,
 			&i.Task.Priority,
 			&i.Task.Status,
 			&i.Task.WorkerID,
@@ -741,7 +748,7 @@ func (q *Queries) FetchTasksOfJobInStatus(ctx context.Context, arg FetchTasksOfJ
 }
 
 const fetchTasksOfWorkerInStatus = `-- name: FetchTasksOfWorkerInStatus :many
-SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity, jobs.UUID as jobUUID
+SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.index_in_job, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity, jobs.UUID as jobUUID
 FROM tasks
 LEFT JOIN jobs ON (tasks.job_id = jobs.id)
 WHERE tasks.worker_id = ?1
@@ -775,6 +782,7 @@ func (q *Queries) FetchTasksOfWorkerInStatus(ctx context.Context, arg FetchTasks
 			&i.Task.Name,
 			&i.Task.Type,
 			&i.Task.JobID,
+			&i.Task.IndexInJob,
 			&i.Task.Priority,
 			&i.Task.Status,
 			&i.Task.WorkerID,
@@ -797,7 +805,7 @@ func (q *Queries) FetchTasksOfWorkerInStatus(ctx context.Context, arg FetchTasks
 }
 
 const fetchTasksOfWorkerInStatusOfJob = `-- name: FetchTasksOfWorkerInStatusOfJob :many
-SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity
+SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.index_in_job, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity
 FROM tasks
 WHERE tasks.worker_id = ?1
   AND tasks.job_id = ?2
@@ -831,6 +839,7 @@ func (q *Queries) FetchTasksOfWorkerInStatusOfJob(ctx context.Context, arg Fetch
 			&i.Task.Name,
 			&i.Task.Type,
 			&i.Task.JobID,
+			&i.Task.IndexInJob,
 			&i.Task.Priority,
 			&i.Task.Status,
 			&i.Task.WorkerID,
@@ -852,7 +861,7 @@ func (q *Queries) FetchTasksOfWorkerInStatusOfJob(ctx context.Context, arg Fetch
 }
 
 const fetchTimedOutTasks = `-- name: FetchTimedOutTasks :many
-SELECT id, created_at, updated_at, uuid, name, type, job_id, priority, status, worker_id, last_touched_at, commands, activity
+SELECT id, created_at, updated_at, uuid, name, type, job_id, index_in_job, priority, status, worker_id, last_touched_at, commands, activity
 FROM tasks
 WHERE
     status = ?1
@@ -881,6 +890,7 @@ func (q *Queries) FetchTimedOutTasks(ctx context.Context, arg FetchTimedOutTasks
 			&i.Name,
 			&i.Type,
 			&i.JobID,
+			&i.IndexInJob,
 			&i.Priority,
 			&i.Status,
 			&i.WorkerID,
@@ -967,20 +977,21 @@ func (q *Queries) JobCountTasksInStatus(ctx context.Context, arg JobCountTasksIn
 }
 
 const queryJobTaskSummaries = `-- name: QueryJobTaskSummaries :many
-SELECT tasks.id, tasks.uuid, tasks.name, tasks.priority, tasks.status, tasks.type, tasks.updated_at
+SELECT tasks.id, tasks.uuid, tasks.name, tasks.index_in_job, tasks.priority, tasks.status, tasks.type, tasks.updated_at
 FROM tasks
 LEFT JOIN jobs ON jobs.id = tasks.job_id
 WHERE jobs.uuid=?1
 `
 
 type QueryJobTaskSummariesRow struct {
-	ID        int64
+	ID         int64
-	UUID      string
+	UUID       string
-	Name      string
+	Name       string
-	Priority  int64
+	IndexInJob int64
-	Status    string
+	Priority   int64
-	Type      string
+	Status     string
-	UpdatedAt sql.NullTime
+	Type       string
+	UpdatedAt  sql.NullTime
 }
 
 func (q *Queries) QueryJobTaskSummaries(ctx context.Context, jobUuid string) ([]QueryJobTaskSummariesRow, error) {
@@ -996,6 +1007,7 @@ func (q *Queries) QueryJobTaskSummaries(ctx context.Context, jobUuid string) ([]
 			&i.ID,
 			&i.UUID,
 			&i.Name,
+			&i.IndexInJob,
 			&i.Priority,
 			&i.Status,
 			&i.Type,

internal/manager/persistence/sqlc/query_task_scheduler.sql.go

@@ -29,7 +29,7 @@ func (q *Queries) AssignTaskToWorker(ctx context.Context, arg AssignTaskToWorker
 }
 
 const fetchAssignedAndRunnableTaskOfWorker = `-- name: FetchAssignedAndRunnableTaskOfWorker :one
-SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity
+SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.index_in_job, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity
 FROM tasks
   INNER JOIN jobs ON tasks.job_id = jobs.id
 WHERE tasks.status=?1
@@ -72,6 +72,7 @@ func (q *Queries) FetchAssignedAndRunnableTaskOfWorker(ctx context.Context, arg
 		&i.Task.Name,
 		&i.Task.Type,
 		&i.Task.JobID,
+		&i.Task.IndexInJob,
 		&i.Task.Priority,
 		&i.Task.Status,
 		&i.Task.WorkerID,
@@ -84,7 +85,7 @@ func (q *Queries) FetchAssignedAndRunnableTaskOfWorker(ctx context.Context, arg
 
 const fetchWorkerTask = `-- name: FetchWorkerTask :one
 SELECT
-  tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity,
+  tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.index_in_job, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity,
   jobs.id, jobs.created_at, jobs.updated_at, jobs.uuid, jobs.name, jobs.job_type, jobs.priority, jobs.status, jobs.activity, jobs.settings, jobs.metadata, jobs.delete_requested_at, jobs.storage_shaman_checkout_id, jobs.worker_tag_id,
   (tasks.status = ?1 AND jobs.status = ?2) as is_active
 FROM tasks
@@ -121,6 +122,7 @@ func (q *Queries) FetchWorkerTask(ctx context.Context, arg FetchWorkerTaskParams
 		&i.Task.Name,
 		&i.Task.Type,
 		&i.Task.JobID,
+		&i.Task.IndexInJob,
 		&i.Task.Priority,
 		&i.Task.Status,
 		&i.Task.WorkerID,
@@ -147,7 +149,7 @@ func (q *Queries) FetchWorkerTask(ctx context.Context, arg FetchWorkerTaskParams
 }
 
 const findRunnableTask = `-- name: FindRunnableTask :one
-SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity
+SELECT tasks.id, tasks.created_at, tasks.updated_at, tasks.uuid, tasks.name, tasks.type, tasks.job_id, tasks.index_in_job, tasks.priority, tasks.status, tasks.worker_id, tasks.last_touched_at, tasks.commands, tasks.activity
 FROM tasks
   INNER JOIN jobs ON tasks.job_id = jobs.id
   LEFT JOIN task_failures TF ON tasks.id = TF.task_id AND TF.worker_id=?1
@@ -244,6 +246,7 @@ func (q *Queries) FindRunnableTask(ctx context.Context, arg FindRunnableTaskPara
 		&i.Task.Name,
 		&i.Task.Type,
 		&i.Task.JobID,
+		&i.Task.IndexInJob,
 		&i.Task.Priority,
 		&i.Task.Status,
 		&i.Task.WorkerID,

internal/manager/persistence/sqlc/schema.sql

@@ -70,6 +70,7 @@ CREATE TABLE tasks (
   name varchar(64) DEFAULT '' NOT NULL,
   type varchar(32) DEFAULT '' NOT NULL,
   job_id integer DEFAULT 0 NOT NULL,
+  index_in_job integer DEFAULT 0 NOT NULL,
   priority smallint DEFAULT 50 NOT NULL,
   status varchar(16) DEFAULT '' NOT NULL,
   worker_id integer,
@@ -77,6 +78,7 @@ CREATE TABLE tasks (
   commands jsonb NOT NULL,
   activity varchar(255) DEFAULT '' NOT NULL,
   PRIMARY KEY (id),
+  UNIQUE(job_id, index_in_job),
   CONSTRAINT fk_tasks_job FOREIGN KEY (job_id) REFERENCES jobs(id) ON DELETE CASCADE,
   CONSTRAINT fk_tasks_worker FOREIGN KEY (worker_id) REFERENCES workers(id) ON DELETE SET NULL
 );

web/app/src/components/jobs/TasksTable.vue

@@ -52,8 +52,7 @@ export default {
     const options = {
       // See pkg/api/flamenco-openapi.yaml, schemas Task and TaskUpdate.
       columns: [
-        // Useful for debugging when there are many similar tasks:
+        { title: 'Num', field: 'index_in_job' },
-        // { title: "ID", field: "id", headerSort: false, formatter: (cell) => cell.getData().id.substr(0, 8), },
         {
           title: 'Status',
           field: 'status',