File storage rewrite (#2676)

* Restructure data layer part 2 (#2599)
* Refactor and separate image model
* Refactor image query builder
* Handle relationships in image query builder
* Remove relationship management methods
* Refactor gallery model/query builder
* Add scenes to gallery model
* Convert scene model
* Refactor scene models
* Remove unused methods
* Add unit tests for gallery
* Add image tests
* Add scene tests
* Convert unnecessary scene value pointers to values
* Convert unnecessary pointer values to values
* Refactor scene partial
* Add scene partial tests
* Refactor ImagePartial
* Add image partial tests
* Refactor gallery partial update
* Add partial gallery update tests
* Use zero/null package for null values
* Add files and scan system
* Add sqlite implementation for files/folders
* Add unit tests for files/folders
* Image refactors
* Update image data layer
* Refactor gallery model and creation
* Refactor scene model
* Refactor scenes
* Don't set title from filename
* Allow galleries to freely add/remove images
* Add multiple scene file support to graphql and UI
* Add multiple file support for images in graphql/UI
* Add multiple file for galleries in graphql/UI
* Remove use of some deprecated fields
* Remove scene path usage
* Remove gallery path usage
* Remove path from image
* Move funscript to video file
* Refactor caption detection
* Migrate existing data
* Add post commit/rollback hook system
* Lint. Comment out import/export tests
* Add WithDatabase read only wrapper
* Prepend tasks to list
* Add 32 pre-migration
* Add warnings in release and migration notes

pkg/sqlite/migrations/custom_migration.go

@@ -0,0 +1,38 @@
+package migrations
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/jmoiron/sqlx"
+)
+
+type migrator struct {
+	db *sqlx.DB
+}
+
+func (m *migrator) withTxn(ctx context.Context, fn func(tx *sqlx.Tx) error) error {
+	tx, err := m.db.BeginTxx(ctx, nil)
+	if err != nil {
+		return fmt.Errorf("beginning transaction: %w", err)
+	}
+
+	defer func() {
+		if p := recover(); p != nil {
+			// a panic occurred, rollback and repanic
+			_ = tx.Rollback()
+			panic(p)
+		}
+
+		if err != nil {
+			// something went wrong, rollback
+			_ = tx.Rollback()
+		} else {
+			// all good, commit
+			err = tx.Commit()
+		}
+	}()
+
+	err = fn(tx)
+	return err
+}