feat: migrate to DragonflyDB and clean up environment configuration

- Replace Redis with DragonflyDB for better performance and memory efficiency
- Remove redundant environment variables (POSTGRES_*, ENCRYPTION_KEY, OAUTH_SERVICE_URL)
- Consolidate database configuration to use single DB_* variables
- Use JWT_SECRET for both JWT tokens and encryption
- Remove PORT variable redundancy, use BACKEND_PORT consistently
- Clean up docker-compose configurations for dev/prod consistency
- Add DragonflyDB configuration with optimized memory usage
- Remove redis.conf as it's no longer needed
- Update health checks to use Redis-compatible CLI for DragonflyDB
- Add missing VITE_API_URL to production frontend
- Fix GitHub Actions to use correct go.sum path
- Clean up development directories and unused files

backend/models/github_backup.go

@@ -0,0 +1,63 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+// GitHubAppInstallState stores short-lived install state values for GitHub App callbacks.
+type GitHubAppInstallState struct {
+	ID        uint           `json:"id" gorm:"primaryKey"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`
+
+	UserID uint `json:"user_id" gorm:"not null;index"`
+	User   User `json:"user,omitempty" gorm:"foreignKey:UserID"`
+
+	State     string     `json:"state" gorm:"not null;size:128;uniqueIndex"`
+	ExpiresAt time.Time  `json:"expires_at" gorm:"not null;index"`
+	UsedAt    *time.Time `json:"used_at"`
+}
+
+// GitHubAppInstallation stores GitHub App installation metadata linked to a Trackeep user.
+type GitHubAppInstallation struct {
+	ID        uint           `json:"id" gorm:"primaryKey"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`
+
+	UserID uint `json:"user_id" gorm:"not null;index"`
+	User   User `json:"user,omitempty" gorm:"foreignKey:UserID"`
+
+	InstallationID int64      `json:"installation_id" gorm:"not null;uniqueIndex"`
+	AppSlug        string     `json:"app_slug" gorm:"size:255"`
+	AccountLogin   string     `json:"account_login" gorm:"size:255"`
+	AccountType    string     `json:"account_type" gorm:"size:64"`
+	LastValidated  *time.Time `json:"last_validated,omitempty"`
+}
+
+// GitHubRepoBackup tracks local repository backups created by Trackeep.
+type GitHubRepoBackup struct {
+	ID        uint           `json:"id" gorm:"primaryKey"`
+	CreatedAt time.Time      `json:"created_at"`
+	UpdatedAt time.Time      `json:"updated_at"`
+	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`
+
+	UserID uint `json:"user_id" gorm:"not null;index:idx_github_backup_user_repo,unique"`
+	User   User `json:"user,omitempty" gorm:"foreignKey:UserID"`
+
+	RepositoryID       int64      `json:"repository_id" gorm:"index"`
+	RepositoryName     string     `json:"repository_name" gorm:"size:255"`
+	RepositoryFullName string     `json:"repository_full_name" gorm:"not null;size:255;index:idx_github_backup_user_repo,unique"`
+	DefaultBranch      string     `json:"default_branch" gorm:"size:255"`
+	CloneURL           string     `json:"clone_url" gorm:"type:text"`
+	LocalPath          string     `json:"local_path" gorm:"not null;type:text"`
+	Source             string     `json:"source" gorm:"not null;size:32"` // oauth or github_app
+	InstallationID     *int64     `json:"installation_id,omitempty"`
+	LastBackupAt       *time.Time `json:"last_backup_at"`
+	LastBackupStatus   string     `json:"last_backup_status" gorm:"not null;default:'pending';size:32"` // pending, success, error
+	LastBackupError    string     `json:"last_backup_error"`
+	LastBackupSize     int64      `json:"last_backup_size"`
+}

backend/models/models.go

@@ -63,6 +63,9 @@ func AutoMigrate() {
 		&Integration{},
 		&SyncLog{},
 		&WebhookEvent{},
+		&GitHubAppInstallState{},
+		&GitHubAppInstallation{},
+		&GitHubRepoBackup{},
 		// Analytics models
 		&Analytics{},
 		&ProductivityMetrics{},