update state history session type

local/migrations/003_update_state_history_sessions.go

@@ -0,0 +1,124 @@
+package migrations
+
+import (
+	"acc-server-manager/local/utl/logging"
+	"fmt"
+
+	"gorm.io/gorm"
+)
+
+// UpdateStateHistorySessions migrates tables from integer IDs to UUIDs
+type UpdateStateHistorySessions struct {
+	DB *gorm.DB
+}
+
+// NewUpdateStateHistorySessions creates a new UUID migration
+func NewUpdateStateHistorySessions(db *gorm.DB) *UpdateStateHistorySessions {
+	return &UpdateStateHistorySessions{DB: db}
+}
+
+// Up executes the migration
+func (m *UpdateStateHistorySessions) Up() error {
+	logging.Info("Checking UUID migration...")
+
+	// Check if migration is needed by looking at the servers table structure
+	if !m.needsMigration() {
+		logging.Info("UUID migration not needed - tables already use UUID primary keys")
+		return nil
+	}
+
+	logging.Info("Starting UUID migration...")
+
+	// Check if migration has already been applied
+	var migrationRecord MigrationRecord
+	err := m.DB.Where("migration_name = ?", "002_migrate_to_uuid").First(&migrationRecord).Error
+	if err == nil {
+		logging.Info("UUID migration already applied, skipping")
+		return nil
+	}
+
+	// Create migration tracking table if it doesn't exist
+	if err := m.DB.AutoMigrate(&MigrationRecord{}); err != nil {
+		return fmt.Errorf("failed to create migration tracking table: %v", err)
+	}
+
+	// Execute the UUID migration using the existing migration function
+	logging.Info("Executing UUID migration...")
+	if err := runUUIDMigrationSQL(m.DB); err != nil {
+		return fmt.Errorf("failed to execute UUID migration: %v", err)
+	}
+
+	logging.Info("UUID migration completed successfully")
+	return nil
+}
+
+// needsMigration checks if the UUID migration is needed by examining table structure
+func (m *UpdateStateHistorySessions) needsMigration() bool {
+	// Check if servers table exists and has integer primary key
+	var result struct {
+		Exists bool `gorm:"column:exists"`
+	}
+
+	err := m.DB.Raw(`
+		SELECT count(*) > 0 as exists FROM state_history
+		WHERE length(session) > 1 LIMIT 1;
+	`).Scan(&result).Error
+
+	if err != nil || !result.Exists {
+		// Table doesn't exist or no primary key found - assume no migration needed
+		return false
+	}
+	return result.Exists
+}
+
+// Down reverses the migration (not implemented for safety)
+func (m *UpdateStateHistorySessions) Down() error {
+	logging.Error("UUID migration rollback is not supported for data safety reasons")
+	return fmt.Errorf("UUID migration rollback is not supported")
+}
+
+// runUpdateStateHistorySessionsMigration executes the UUID migration using the SQL file
+func runUpdateStateHistorySessionsMigration(db *gorm.DB) error {
+	// Disable foreign key constraints during migration
+	if err := db.Exec("PRAGMA foreign_keys=OFF").Error; err != nil {
+		return fmt.Errorf("failed to disable foreign keys: %v", err)
+	}
+
+	// Start transaction
+	tx := db.Begin()
+	if tx.Error != nil {
+		return fmt.Errorf("failed to start transaction: %v", tx.Error)
+	}
+
+	defer func() {
+		if r := recover(); r != nil {
+			tx.Rollback()
+		}
+	}()
+
+	migrationSQL := "UPDATE state_history SET session = upper(substr(session, 1, 1));"
+
+	// Execute the migration
+	if err := tx.Exec(string(migrationSQL)).Error; err != nil {
+		tx.Rollback()
+		return fmt.Errorf("failed to execute migration: %v", err)
+	}
+
+	// Commit transaction
+	if err := tx.Commit().Error; err != nil {
+		return fmt.Errorf("failed to commit migration: %v", err)
+	}
+
+	// Re-enable foreign key constraints
+	if err := db.Exec("PRAGMA foreign_keys=ON").Error; err != nil {
+		return fmt.Errorf("failed to re-enable foreign keys: %v", err)
+	}
+
+	return nil
+}
+
+// RunUpdateStateHistorySessionsMigration is a convenience function to run the migration
+func RunUpdateStateHistorySessionsMigration(db *gorm.DB) error {
+	migration := NewUpdateStateHistorySessions(db)
+	return migration.Up()
+}