feat(BE): approval_workflow, adjusment project_flocks, common, and migration

internal/entities/approval.go

@@ -0,0 +1,28 @@
+package entities
+
+import (
+	"time"
+)
+
+type ApprovalAction string
+
+const (
+	ApprovalActionApproved ApprovalAction = "APPROVED"
+	ApprovalActionRejected ApprovalAction = "REJECTED"
+	ApprovalActionCreated  ApprovalAction = "CREATED"
+	ApprovalActionUpdated  ApprovalAction = "UPDATED"
+)
+
+type Approval struct {
+	Id             uint            `gorm:"primaryKey"`
+	ApprovableType string          `gorm:"size:50;not null;index:approvals_approvable_lookup,priority:1"`
+	ApprovableId   uint            `gorm:"not null;index:approvals_approvable_lookup,priority:2"`
+	StepNumber     uint16          `gorm:"not null"`
+	StepName       string          `gorm:"not null"`
+	Action         *ApprovalAction `gorm:"type:VARCHAR(20)"`
+	Notes          *string         `gorm:"type:text"`
+	ActionAt       time.Time       `gorm:"autoCreateTime"`
+	ActionBy       *uint           `gorm:"index"`
+
+	ActionUser *User `gorm:"foreignKey:ActionBy;references:Id"`
+}