feat: Implement multi-configuration support for jobs

- Add support for multiple transfer configurations per job, allowing users to select one or more configurations.
- Update job creation and editing forms to handle multiple configuration selections with checkboxes.
- Enhance job processing logic to iterate through all associated configurations during execution.
- Introduce database migrations to add necessary fields for storing multiple configuration IDs.
- Update dashboard and history views to display configuration details for jobs.
- Refactor related templates and handlers to accommodate the new multi-configuration functionality.

internal/db/migrations/add_multi_config_support.go

@@ -0,0 +1,49 @@
+package migrations
+
+import (
+	"github.com/go-gormigrate/gormigrate/v2"
+	"gorm.io/gorm"
+)
+
+// AddMultiConfigSupport adds support for multiple configurations per job
+func AddMultiConfigSupport() *gormigrate.Migration {
+	return &gormigrate.Migration{
+		ID: "20250315_add_multi_config_support",
+		Migrate: func(tx *gorm.DB) error {
+			// Add config_ids column to jobs table
+			if err := tx.Exec("ALTER TABLE jobs ADD COLUMN config_ids TEXT").Error; err != nil {
+				return err
+			}
+
+			// Add config_id column to job_histories table
+			if err := tx.Exec("ALTER TABLE job_histories ADD COLUMN config_id INTEGER").Error; err != nil {
+				return err
+			}
+
+			// Add config_id column to file_metadata table
+			if err := tx.Exec("ALTER TABLE file_metadata ADD COLUMN config_id INTEGER").Error; err != nil {
+				return err
+			}
+
+			// Update existing jobs to set the config_ids field to match the current config_id
+			if err := tx.Exec("UPDATE jobs SET config_ids = config_id WHERE config_id > 0").Error; err != nil {
+				return err
+			}
+
+			return nil
+		},
+		Rollback: func(tx *gorm.DB) error {
+			// Drop the config_id columns from job_histories and file_metadata
+			if err := tx.Exec("ALTER TABLE job_histories DROP COLUMN config_id").Error; err != nil {
+				return err
+			}
+
+			if err := tx.Exec("ALTER TABLE file_metadata DROP COLUMN config_id").Error; err != nil {
+				return err
+			}
+
+			// Drop the config_ids column from jobs
+			return tx.Exec("ALTER TABLE jobs DROP COLUMN config_ids").Error
+		},
+	}
+}

internal/db/migrations/migrations.go

@@ -13,6 +13,7 @@ func InitMigrations(db *gorm.DB) *gormigrate.Gormigrate {
 		AddCloudStorageFields(),
 		AddSkipProcessedFilesColumn(),
 		AddMaxConcurrentTransfersColumn(),
+		AddMultiConfigSupport(),
 	}
 
 	return gormigrate.New(db, gormigrate.DefaultOptions, migrations)