Add filesystem based blob storage (#3187)

* Refactor transaction hooks. Add preCommit
* Add BlobStore
* Use blobStore for tag images
* Use blobStore for studio images
* Use blobStore for performer images
* Use blobStore for scene covers
* Don't generate screenshots in legacy directory
* Run post-hooks outside original transaction
* Use blobStore for movie images
* Remove unnecessary DestroyImage methods
* Add missing filter for scene cover
* Add covers to generate options
* Add generate cover option to UI
* Add screenshot migration
* Delete thumb files as part of screenshot migration

internal/api/resolver_mutation_migrate.go

@@ -0,0 +1,40 @@
+package api
+
+import (
+	"context"
+	"strconv"
+
+	"github.com/stashapp/stash/internal/manager"
+	"github.com/stashapp/stash/internal/manager/task"
+	"github.com/stashapp/stash/pkg/scene"
+	"github.com/stashapp/stash/pkg/utils"
+)
+
+func (r *mutationResolver) MigrateSceneScreenshots(ctx context.Context, input MigrateSceneScreenshotsInput) (string, error) {
+	db := manager.GetInstance().Database
+	t := &task.MigrateSceneScreenshotsJob{
+		ScreenshotsPath: manager.GetInstance().Paths.Generated.Screenshots,
+		Input: scene.MigrateSceneScreenshotsInput{
+			DeleteFiles:       utils.IsTrue(input.DeleteFiles),
+			OverwriteExisting: utils.IsTrue(input.OverwriteExisting),
+		},
+		SceneRepo:  db.Scene,
+		TxnManager: db,
+	}
+	jobID := manager.GetInstance().JobManager.Add(ctx, "Migrating scene screenshots to blobs...", t)
+
+	return strconv.Itoa(jobID), nil
+}
+
+func (r *mutationResolver) MigrateBlobs(ctx context.Context, input MigrateBlobsInput) (string, error) {
+	db := manager.GetInstance().Database
+	t := &task.MigrateBlobsJob{
+		TxnManager: db,
+		BlobStore:  db.Blobs,
+		Vacuumer:   db,
+		DeleteOld:  utils.IsTrue(input.DeleteOld),
+	}
+	jobID := manager.GetInstance().JobManager.Add(ctx, "Migrating blobs...", t)
+
+	return strconv.Itoa(jobID), nil
+}