Add worker stats to the wizard, artifact pruning and offline-worker removal to the admin console

coordinator/internal/usecase/prune.go

@@ -0,0 +1,55 @@
+package usecase
+
+import (
+	"context"
+	"time"
+)
+
+// PruneArtifacts removes completed or failed jobs older than `olderThan` and
+// every artifact they own: database rows cascade, blob files are deleted
+// explicitly. It returns what was freed so the admin console can report it.
+type PruneArtifacts struct {
+	jobs  JobRepository
+	read  UIReadRepository
+	blobs BlobStore
+	clk   Clock
+}
+
+func NewPruneArtifacts(jobs JobRepository, read UIReadRepository, blobs BlobStore, clk Clock) *PruneArtifacts {
+	return &PruneArtifacts{jobs: jobs, read: read, blobs: blobs, clk: clk}
+}
+
+type PruneResult struct {
+	Jobs       int   `json:"jobs"`
+	Artifacts  int   `json:"artifacts"`
+	FreedBytes int64 `json:"freed_bytes"`
+}
+
+// Execute deletes finished jobs whose completion timestamp is older than the
+// cutoff. Jobs that are still active are never touched.
+func (uc *PruneArtifacts) Execute(ctx context.Context, olderThan time.Duration) (PruneResult, error) {
+	cutoff := uc.clk.Now().Add(-olderThan)
+	jobs, err := uc.jobs.ListCompletedBefore(ctx, cutoff)
+	if err != nil {
+		return PruneResult{}, err
+	}
+	out := PruneResult{}
+	for _, job := range jobs {
+		artifacts, err := uc.read.ListArtifactsByJob(ctx, job.ID)
+		if err != nil {
+			return out, err
+		}
+		for _, artifact := range artifacts {
+			if err := uc.blobs.Delete(ctx, artifact.StorageKey); err != nil {
+				return out, err
+			}
+			out.FreedBytes += artifact.SizeBytes
+			out.Artifacts++
+		}
+		if err := uc.jobs.Delete(ctx, job.ID); err != nil {
+			return out, err
+		}
+		out.Jobs++
+	}
+	return out, nil
+}